Larimichthys Polyactis Research Articles

Preparation and characterization of acid and pepsin-soluble collagens from scales of croceine and redlip croakers

Acid-soluble (ASC) and pepsin-soluble collagen (PSC) from scales of croceine croaker (ASC-PC and PSC-PC) and redlip croaker (ASC-PP and PSC-PP) were prepared with yields of 0.37±0.08% (ASCPC), 1.09±0.23% (PSC-PC), 0.42±0.09% (ASC-PP), and 1.14±0.30% (PSC-PP) (dry scale basis). Gly (347.1-359.8 residues/1,000 residues) was the major amino acid. Contents of imino acid were between 189.4 and 192.9 residues/1,000 residues in all 4 collagens. ASC-PC and ASC-PP were type I collagens. Differences in subunit components between ASC and PSC were observed. Denaturation temperature values of ASC-PC, ASC-PP, PSC-PC, and PSC-PP were 30.7, 30.1, 27.5, and 26.6°C, respectively. All 4 collagens were soluble at pH 1-4. Values declined when NaCl concentrations exceeded 2%. Freeze-dried collagens showed loose, fibrous, and porous structures. The 4 scale collagens can be alternatives to collagen from terrestrial animals for applications in functional food, cosmetic, and biomedical industries.

Development and preliminary evaluation of a genomewide single nucleotide polymorphisms resource generated by RAD-seq for the small yellow croaker (Larimichthys polyactis).

Recent advances in high-throughput sequencing technologies have offered the possibility to generate genomewide sequence data to delineate previously unidentified genetic structure, obtain more accurate estimates of demographic parameters and to evaluate potential adaptive divergence. Here, we identified 27556 single nucleotide polymorphisms for the small yellow croaker (Larimichthys polyactis) using restriction-site-associated DNA (RAD) sequencing of 24 individuals from two populations. Significant sources of genetic variation were identified, with an average nucleotide diversity (π) of 0.00105±0.000425 across individuals, and long-term effective population size was thus estimated to range between 26172 and 261716. According to the results, no differentiation between the two populations was detected based on the SNP data set of top quality score per contig or neutral loci. However, the two analysed populations were highly differentiated based on SNP data set of both top FST value per contig and the outlier SNPs. Moreover, local adaptation was highlighted by an FST -based outlier tests implemented in LOSITAN and a total of 538 potentially locally selected SNPs were identified. blast2go annotation of contigs containing the outlier SNPs yielded hits for 37 (66%) of 56 significant blastx matches. Candidate genes for local adaptation constituted a wide array of biological functions, including cellular response to oxidative stress, actin filament binding, ion transmembrane transport and synapse assembly. The generated SNP resources in this study provided a valuable tool for future population genetics and genomics studies of L.polyactis.

Factors affecting morphological development of the sagittal otolith in juvenile and adult small yellow croaker (Larimichthys polyactisBleeker, 1877)

Summary The morphology and morphometrics of the sagittal otoliths of small yellow croaker (Larimichthys polyactis) from the southern Yellow Sea were investigated. Study objectives were to evaluate the shape variability and morphometric variables of sagittae of juveniles and adults as related to developmental changes and habit shift. A total of 152 fish were sampled from April to June of 2012 and 2013, along the coastal waters of the Lusi spawning ground in the southern Yellow Sea. Changes in otolith shapes from the juvenile to the adult were presented with the rim development through the entire-lobed-entire transition and with the curvature of the cauda toward the ventral margin. The otolith elongation in the juvenile stage occurred at 10–20 mm standard length (SL) and was likely associated with the formation of otolith accessory growth centers from larvae to juvenile. The L. polyactis sagittal otoliths acquired their definitive shape at 130 mm SL maturity. Ontogeny on otolith shape might be related, for example, to the factors of metamorphic development, feeding habitat, and ambient water salinity, which varied throughout the growth of L. polyactis.

Impacts of fishing on the marine mean trophic level in Chinese marine area

Studying the long-term effects of fishing on the marine mean trophic level (MTL) is very important for understanding the status of marine ecosystems, and it will help in the design of appropriate conservation management strategies. Using data on fishery landings from the FAO Fishery Statistics (FishStatJ_2.0.0_win32, 1950 to 2011), we analyzed changes in the fishery landings of 51 marine species/groups in the Chinese marine area and their impacts on MTL. We obtained the following results: China's fishery landings increased gradually from 0.72×106t to 3.29×106t between 1950 and 1977; it increased sharply from 2.74×106t to 13.21×106t between 1981 and 1998, declined to 12.00×106t in 2002 and remained relatively stable until 2008, and increased again to 12.86×106t between 2009 and 2011. The percentage of landings from species/groups whose trophic level was higher than 3.5 was about 28% in 1975–1977; it declined to 17.1% in 1979–1981, increased to 27.00% in 1979–1981, declined from 24.57% to 13.64% in 1982–1988, fluctuated around 19.43% in 1997, and then increased steadily to 35.8% from 1997 to 2011. China's MTL remained stable from 1950 to 1974, fluctuated slightly around 3.45, declined to 3.35 in 1975–1978, and increased to 3.45 in 1979–1981. However, the MTL declined sharply to 3.25 in 1982–1987 and remained stable 10years afterwards. The decreasing rate of MTL was 0.05 per decade during 1950–1997; it increased gradually to 3.34 from 1997 to 2011, during which the increasing rate was 0.12 per decade. The fishing in balance index of Chinese marine area showed a clear increasing trend since 1950; the trend was greater than 0.5 since 1959, and it increased to greater than 1 since 1995. The changes in MTL were closely related to the composition of the fish species/groups in the total fishery landings, especially the fish species/groups of which the MTL was greater than 3.5, such as Trichiurus haumela, Larimichthys polyactis, Larimichthys crocea, Engraulis japonicas, and Decapterus spp. The general declining trend of MTL indicates that the dominant fishery landings changed from benthic fishes with a long life span and high trophic level (e.g., T. haumela) to invertebrates and pelagic fishes with a short life span and low trophic level (e.g., Decapterus spp.). The increase in MTL in China from 1997 to 2011 may be attributable to a series of fishery management countermeasures, such as setting up closed fishing seasons and non-fishing zones, establishing marine protected areas for fishery restoration. We also found that MTL may differ when statistical landings data and species richness data are used, and may be affected by the quality of the fisheries statistics. Moreover, species' trophic level, which is assumed to be constant, may have changed over time. The effects of these factors on MTL should be explored in the future.

Relationships between fish size and otolith measurements for 33 fish species caught by bottom trawl in Haizhou Bay, China

Information from otoliths, together with data such as fish length and growth, can be a useful tool for population identification, aging, and feeding studies as well as stock assessments (Harvey et al., 2000; H€ ussy et al., 2010; Jawad et al., 2011). Since Trout (1954) and Templemann and Squires (1956) studied the relationship between cod size and otolith measurements, relationships between fish size and otolith dimensions have been explored for many species (Jawad et al., 2012). For example, Steward et al. (2009) used the relationship between fish length and otolith dimensions to predict age in gray angelfish, and Ag€ uera and Brophy (2011) used otolith shape analysis for the discrimination of Atlantic saury stocks. Haizhou Bay is an open bay on the western margin of the southern Yellow Sea and historically an important fishing ground. The bay still serves as a critical spawning and nursery habitat for many commercial fish species, such as Larimichthys polyactis, Setipinna taty and Engraulis japonicas (Editorial Board of Annals of Bays in China, 1993). The relationship between fish length and otolith dimensions can be described by using a simple linear regression (Harvey et al., 2000; Jawad and Al-Mamry, 2012), but these relationships between fish size and their otolith dimensions are lacking in the literature for species living in the Haizhou Bay. The objective of this study was to determine the relationships between fish length and otolith dimensions (otolith length, width, long radius and short radius) using simple linear regression for 33 species in Haizhou Bay. These results can provide a foundation for further research on these species, which may require knowledge of these relationships.

Molecular identification of Anisakis and Hysterothylacium larvae in marine fishes from the East China Sea and the Pacific coast of central Japan

Anisakiasis is a human disease caused by the accidental ingestion of larvae belonging to the family Anisakidae. Three fish species, the small yellow croaker Pseudosciaena polyactis, the mackerel Pneumatophorus japonicus and the hairtail Trichiurus haumela are important source for food products in the East China Sea. The prevalence and the identification of Anisakidae larvae in these fishes will benefit the prevention and control of anisakiasis. In this study, fish samples were obtained from fish markers in the East China Sea and the Pacific coast of central Japan during April 2011 and July 2013. For species identification, the PCR-based restriction fragment length polymorphism (PCR–RFLP) analysis of the entire ITS region (ITS1, 5.8 S and ITS2) of nuclear ribosomal DNA (rDNA) was performed. In total, 2004 larvae were collected from 80 hairtail fish, 20 small yellow croaker, and 27 mackerel from the East China Sea and the Pacific coast of central Japan. High prevalence of Anisakidae larvae infection (116/122, 95.1%) was detected in the East China Sea. Seven species were identified belonging to the genera Anisakis (Nematoda: Anisakidae) and Hysterothylacium (Nematoda: Anisakidae). Anisakis pegreffii was the predominant species accounting for 84.8% of all larvae examined in East China Sea, while all Anisakidae larvae isolated from Japan were identified as Anisakis simplex sensu stricto (s.s.). In the East China Sea, A. simplex s.s. and Anisakis typica were 0.6% (4/619) and 1.5% (9/619) of the identified nematodes, respectively. Interestingly, one larva was identified as a recombinant genotype of A. simplex s.s. and A. pegreffii. In addition, four species of the genus Hysterothylacium, namely, Hysterothylacium amoyense (31/619, 5.0%), Hysterothylacium aduncum (10/619, 1.6%), Hysterothylacium fabri (21/619, 3.4%) and Hysterothylacium spp. (18/619, 2.9%) were also identified in the present study. This is a comprehensive epidemiological dataset for the family Anisakidae in the East China Sea. The identification of A. typica, recombinant genotype of A. simplex s.s. and A. pegreffii, H. amoyense and H. fabri is first reported in this area. The wide diversity and substantial geographical distributions of these nematodes will provide a foundation for future studies of Anisakidae family. The high prevalence of these nematodes in marine fishes off the East China Sea may pose considerable food safety problems, which is a potential cause of human anisakiasis.

Food allergen sensitization patterns in Korean adult food allergy patients

Methods This study enrolled 134 adult patients who visited the allergy clinic of Severance Hospital due to their allergic symptoms related to food ingestion. Patients underwent skin prick test (SPT) with 55 allergens. Our food SPT panel included hairtail, yellow corvina, common eel, skate, squid, mackerel, anchovy, saury, octopus, chrysalis, sunflower seed, and pollock allergens prepared at our Institute of Allergy and reflecting the daily eating habits of Korean people.

종 특이 프라이머를 이용한 동물성 식품원료의 진위 판별법 개발

본 연구에서는 식품 중 동물성 사용원료의 진위 판별을 위하여 분자생물학적 기법을 이용한 시험법을 개발하였다. 동물성 식품원료의 종 판별을 위한 유전자로는 미토콘드리아 DNA에 존재하는 COI, Cytb, 및 16S rRNA 유전자를 대상으로 하였으며, 가공식품에 적용하기 위하여 PCR 산물의 크기는 200 bp 내외가 되도록 종 특이 프라이머를 설계하였다. 대상종으로는 가축류 2종, 가금류 6종, 민물어류 2종, 해양어류 13종 및 갑각류 1종, 총 24종을 선정하였으며 종 특이 프라이머를 이용하여 예상되는 PCR 산물의 생성 유무를 확인하였다. PCR을 수행한 결과 토끼, 여우, 꿩, 집비둘기, 멧비둘기, 메추리, 참새, 제비, 메기, 쏘가리, 날치, 열빙어, 청어, 까나리, 멸치, 참조기, 넙치, 조피볼락, 홍어, 가오리, 말쥐치, 농어, 성게 및 바닷가재에 대하여 각각 156, 204, 152, 160, 113, 163, 167, 152, 165, 121, 136, 151, 178, 178, 146, 188, 177, 166, 179, 218, 188, 185, 127 및 172 bp에서 PCR 증폭 산물을 확인하였다. 그리고 프라이머 별로 비교종에서는 비특이적 PCR 산물(non-specific PCR product)은 생성되지 않았다. 본 연구에서 개발된 유전자 분석법을 이용하여 동물성 식품원료가 사용된 식품 원료 및 가공식품의 진위 판별에 활용이 가능할 것이며, 불량식품 근절에 크게 기여할 것으로 기대된다. In this study, the detection method was developed using molecular biological technique to distinguish authenticity of animal raw materials. The genes for distinction of species about animals targeted at Cytochrome c oxidase subunit I (COI), Cytochrome b (Cytb), and 16S ribosomal RNA (16S rRNA) genes in mitochondrial DNA. The species-specific primers were designed by that Polymerase Chain Reaction (PCR) product size was around 200 bp for applying to processed products. The target 24 raw materials were 2 species of domestic animals, 6 species of poultry, 2 species of freshwater fishes, 13 species of marine fishes and 1 species of crustaceans. The results of PCR for Rabbit, Fox, Pheasant, Domestic Pigeon, Rufous Turtle Dove, Quail, Tree Sparrow, Barn Swallow, Catfish, Mandarin Fish, Flying Fish, Mallotus villosus, Pacific Herring, Sand Lance, Japanese Anchovy, Small Yellow Croaker, Halibut, Jacopever, Skate Ray, Ray, File Fish, Sea Bass, Sea Urchin, and Lobster raw materials were confirmed 113 bp ~ 218 bp, respectively. Also, non-specific PCR products were not detected in compare species by species-specific primers. The method using primers developed in this study may be applied to distinguish an authenticity of food materials included animal raw materials for various processed products.

가입당 생산액 분석에 의한 한국 해역 참조기 Larimichthys polyactis 자원의 관리

This study was performed to estimate optimum fishing mortality (F) and the age at first capture (<TEX>$t_c$</TEX>) for small yellow croaker in Korean waters. We first estimated optimum F and <TEX>$t_c$</TEX> using traditional yield-per-recruit (YPR) analysis, and the results were 0.8/year and 2.5 years old, respectively. However, the individual fish price per unit weight of small yellow croaker in Korea increases dramatically by size. Thus, we developed an alternative method, which is called as production value-per-recruit (PPR) analysis. We developed two types of the PPR analysis, that is, the discrete function and the continuous function method. We estimated optimum F and <TEX>$t_c$</TEX> using the two types of the PPR analysis and compared the results. The optimum F and <TEX>$t_c$</TEX> from the discrete function method, were 0.3/year and 5.0 years old, respectively, while those from the continuous function method were 0.5/year and 3.5 years old, respectively. These PPR estimates were much more conservative for the stock management than the traditional YPR analysis, which can prevent the fish stock from the economic overfishing. As a result, the PPR analysis could be more proper approach for stock assessment in the case that the individual fish price per unit weight increases dramatically by size like small yellow croaker in Korea.

참조기 유자망의 설 높이에 따른 어획특성

Small yellow croaker is one of the important stocks in Korean waters. In this study, we conducted sea trials to estimate optimum height of a drift gill net for effective fishing of small yellow croaker. In the trial using existing net which has 9.2m in height, there was 22 species (1,180 fishes, 99.9kg) caught. The catch (in individuals) of small yellow croaker, especially larger fishes (over 22cm in FL), was higher as part of net height is higher, while the number of species bycaught and the catch of those species were higher as part of net height is lower. In the trial using extension net which has 18.4m in height, there was 27 species (2,030 fishes, 151.7kg). It showed same pattern with existing net in the section I to III, however, in the section IV which is over 13.8m of net height, the catch sharply decreased. The number of species bycaught and the catch of those species using extension net were also same as results using existing net. It showed that section III (9.2-13.8m) where is upper-middle part of the net has caught most of catch and large fishes having over 22cm in length. Through these results, it is judged that the setting depth of the net where is 4.6-13.8m above the sea bottom is the best to reduce bycatch and catch much more large size fishes, and the catch per net is proportional to filtering area of net. Therefore the Fisheries Resource Management Act (the clause 1, article 10) on the amount of usage for offshore drift gill net need to be considered not only length of a net but also net height.

황해저층냉수에 따른 참조기(Larimichthys polyactis) 어황의 변화와 예측 가능성

We consider changes in the fishing ground of the small yellow croaker Larimichthys polyactis and discuss their utility in predicting fishing conditions for this species. The fishing ground, which having been formed around Jeju Island since the 1970s, is dominated by the Yellow Sea Bottom Cold Water (YSBCW), and variation in its southward expansion from the Yellow Sea is the single most key environmental factor affecting the L. polyactis catch. When the YSBCW showed strong expansion and the fishing ground shifted to the west and southwest of Jeju Island, as occurred in the late 1980s, late 1990s, and early 2000s, the L. polyactis catch was low; conversely, when expansion was weak, as in the early 1990s and late 2000s, the L. polyactis catch was high. This relationship was statistically significant and should be useful in predicting fishing conditions for L. polyactis.

Mixed-stock analysis of small yellow croaker Larimichthys polyactis providing implications for stock conservation and management

Application of mixed-stock analysis (MSA) is traditionally difficult for marine fish species in comparison to anadromous and/or freshwater ones, due to the lack of clear barriers to gene flow in the ocean. The small yellow croaker Larimichthys polyactis is one of the most important fishery species in Northwest Pacific region. Effective population size of this high gene-flow marine fish species has declined drastically due to overfishing. Here, we performed genetic mixed-stock analysis using six microsatellite markers on two overwintering aggregations of small yellow croaker (20 collections, 684 individuals) from the Yellow Sea and the northern East China Sea, and on its corresponding baseline populations (spawning populations including 32 collections and 1104 individuals). MSA of the overwintering samples from the Yellow Sea revealed that the major contribution to this mixed stock was from the populations along the central Yellow Sea (60%), while the populations along the Bohai Sea contributed 8.3% to the mixed stock. Analysis of mixed-stock samples from the northern East China Sea showed that populations along the coast of the northern East China Sea and populations along the southern Yellow Sea contributed the most 69.7% and the least 4.6% to the mixed stock, respectively. The accuracy of MSA for marine fish species is mainly limited by the relatively low level of genetic divergence. This is the first report using MSA methodology on fish species along the coastal waters of China in Northwest Pacific. The results provide important implications on the conservation and management of the wild resources of this species. In addition, our data is also useful for future mixed-stock study on other high gene-flow marine fish species.

Investigating the population structure of small yellow croaker (Larimichthys polyactis) using internal and external features of otoliths

In this study, we investigated the population structure and potential changes of the small yellow croaker from nine main spawning grounds covering most of the distributional range of the species in China. The geographic variability of otolith shape and increment growth were used as tools for stock separation. Otolith growth was based on the annual increment width estimated for the age 2 groups of the spawning stock. Otolith shape was described by the shape variables and Fourier coefficients, that were standardized to remove any size effects. Significant differences and gradual variation with latitude were observed in both the otolith growth and shape variables among stocks; these patterns were supported by discriminant analysis with correct classifications ranging from 26.1% to 82.3%. These results taken together show that the nine stocks could be divided into four subpopulations which were correctly classified by around 75.8–95.9%; the main difference of average otolith shapes for these subpopulations appeared on the ventral side. In contrast to previous population studies, the East China Sea group was further divided into the Southern and Northern two subpopulations and the Haizhou Bay stock appear to be more similar to the Lvsi stock. Moreover, considerable spatial variation in otolith shape and increment growth implied different environmental factors experienced by subpopulations and limited levels of inter-connection, and suggested that the small yellow croaker might be comprised of a metapopulation structure.

Phylogenetic estimation of Sciaenidae in the East China Sea inferred from nuclear EPIC DNA sequence variation

Here we describe a phylogenetic analysis of sciaenids of the East China Sea based on nuclear exon-primed intron-crossing genes (EPIC markers) and a mitochondrial gene (CO1). Separate analyses of the two data partitions resulted in mostly congruent trees. Although there were some differences in the classification of these species, the main difference between trees obtained by the mitochondrial gene (CO1) and nuclear DNA sequences was the position of Miichthys miiuy and Johnius belangerii. In the mitochondrial phylogeny, Johnius belangerii was placed at the most basal position forming an individual clade, while other species formed another large cluster. Miichthys miiuy formed an independent basal sub-clade grouped with Larimichthys and Collichthys. Collichthys lucidus was grouped with Larimichthys crocea and Larimichthys polyactis. Trees based on the nuclear genes differed somewhat from those based on the CO1 mitochondrial gene. In this analysis, two groups resulted, the Larimichthys and Collichthys clade, and another clade including a total of five species: Johnius belangerii, Nibea albiflora, Pennahia argentata, Sciaenops ocellatus, and Argyrosomus japonicus; Johnius belangerii clustered with Nibea albiflora. Miichthys miiuy was placed at the basal position of the other cluster because it was an independent basal sub-clade grouped with Johnius belangerii, Nibea albiflora, Pennahia argentata, Sciaenops ocellatus, and Argyrosomus japonicus. Many aspects of the phylogeny of the Sciaenidae remain unresolved, and further analysis based on more molecular information and extensive taxon sampling is necessary to elucidate the phylogenetic relationships among the major lineages within Sciaenidae.

莱州湾及黄河口水域鱼类群落结构的季节变化

PDF HTML阅读 XML下载 导出引用 引用提醒 莱州湾及黄河口水域鱼类群落结构的季节变化 DOI: 10.5846/stxb201303060354 作者: 作者单位: 上海海洋大学海洋科学学院 上海;山东省渔业资源与生态环境重点实验室 中国水产科学研究院黄海水产研究所 青岛;山东省渔业资源与生态环境重点实验室 中国水产科学研究院黄海水产研究所 青岛,山东省渔业资源与生态环境重点实验室 中国水产科学研究院黄海水产研究所 青岛;山东省渔业资源与生态环境重点实验室 中国水产科学研究院黄海水产研究所 青岛,山东省渔业资源与生态环境重点实验室 中国水产科学研究院黄海水产研究所 青岛,山东省渔业资源与生态环境重点实验室 中国水产科学研究院黄海水产研究所 青岛,山东省渔业资源与生态环境重点实验室 中国水产科学研究院黄海水产研究所 青岛 作者简介: 通讯作者: 中图分类号: 基金项目: 国家重点基础研究发展计划资助项目（2011CB409805，2010CB951204）；山东省优秀中青年科学家科研奖励基金资助项目（BS2012HZ030）；山东省泰山学者专项基金资助项目 Seasonal variations in fish community structure in the Laizhou Bay and the Yellow River Estuary Author: Affiliation: College of Marine Sciences, Shanghai Ocean University, Shanghai;Shandong Provincial Key Laboratory of Fishery Resources and Ecological Environment, Yellow Sea Fisheries Research Institute, CAFS, Qingdao,,,,Shandong Provincial Key Laboratory of Fishery Resources and Ecological Environment, Yellow Sea Fisheries Research Institute, CAFS, Qingdao Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:根据2011年5月-2012年4月对莱州湾及黄河口水域9个航次的渔业底拖网调查数据，对该水域鱼类群落结构特征及其季节变化进行了初步研究。结果表明：莱州湾及黄河口水域共捕获鱼类62种，隶属于11目、34科、53属，主要由暖水种和暖温种组成，其中鲈形目种类最多（37种），其次是鲉形目（7种）和鲽形目（6种）。春季优势种包括矛尾鰕虎鱼（Chaeturichthys stigmatias）、鲱衔（Callionymus beniteguri）、短吻红舌鳎（Cynoglossus joyneri）、矛尾复鰕虎鱼（Synechogobius hasta）和方氏云鳚（Enedrias fangi），其渔获量占总渔获量的70.8%；夏季包括矛尾鰕虎鱼、斑鰶（Konosirus punctatus）、鲱衔和短吻红舌鳎，占总渔获量的68.1%；秋季包括矛尾鰕虎鱼、赤鼻棱鳀（Thrissa kammalensis）、鳀（Engraulis japonicus）、青鳞小沙丁鱼（Sardinella zunasi）、斑鰶、小黄鱼（Larimichthys polyactis）和矛尾复鰕虎鱼，占总渔获量的87.1%。平均单位时间渔获量存在显著季节变化，以秋季最高（22.63kg/h），其次是夏季（16.75kg/h），春季最低（1.29kg/h）。春季（5月）平均单位时间渔获量为0.69kg/h，为1959年、2003年、2006年和2008年春季（5月）的0.3%、0.3%、1.7%和541.2%，鱼类资源量虽有所回升，但总体呈大幅下降的趋势。鱼类种类数、丰富度指数和多样性指数夏季较高，秋季次之，春季最低，但是以渔获尾数计算的均匀度指数，夏季最大，春季最小，以渔获量计算的均匀度指数则相反，且丰富度指数和多样性指数与表层温度呈极显著相关（P<0.01），丰富度指数和均匀度指数与表层盐度呈极显著相关（P<0.01）。 Abstract:Seasonal variations in fish community structure characteristics in the Laizhou Bay and the Yellow River Estuary were analyzed by combining data collected from bottom trawl surveys on 9 different voyages in May-November, 2011 and March-April, 2012 with existing historical data. A total 62 fish species were caught, belonging to 11 orders and 34 families, which mainly comprised warm water and warm temperate species. The Perciformes were the most abundant (37 species), followed by the Scorpaeniformes (7 species) and Pleuronectiformes (6 species). In terms of total catch per haul (kg) and the number per haul, warm temperate species were the most abundant followed by warm water species and cold temperate species. The warm temperate species catches were highest in spring in the coastal region, whereas warm water and warm temperate species catches were higher in summer and autumn, which were mostly distributed in the northeast Laizhou Bay deep-water area in autumn. Warm temperate species were widely distributed in summer and warm water species were mostly distributed in the coastal region of southern Laizhou Bay. The dominant species in spring were mainly non-commercial demersal fish; Chaeturichthys stigmatias, Callionymus beniteguri, Synechogobius hasta, and Enedrias fangi accounted for 66.4% of the total catch. The dominant species in summer were also mainly non-commercial demersal fish species; C. stigmatias and C. beniteguri accounted for 44.6% of the total catch. While in autumn, the dominant species were mainly commercial pelagic fish; Engraulis japonicus, Sardinella zunasi, and Konosirus punctatus accounted for 40.8% of the total catch. According to the dominance curve, the dominant species were most prominent in summer, autumn, and spring in that order. The catch per haul exhibited significant seasonal variation, being highest in autumn (22.66 kg/h) followed by summer (16.75kg/ h) then spring (1.29 kg/ h). The average catch per haul of the dominant species in spring (May) was 0.69 kg/h, which is 0.3%, 0.3%, 1.7%, and 541.2% of the surveys in the spring (May) of 1959, 2003, and 2008, respectively. Despite the small increase in fish resources, the overall trend shows a substantial decrease. Species composition exhibited higher similarities in adjacent months, i.e. each month of the same season and the months of summer and autumn. The number of fish species and abundance and diversity indices were all highest in summer, followed by autumn and then spring. However, the evenness index calculated by number was highest in summer and lowest in spring, this trend was inversed when the index was calculated by weight. The species abundance and diversity indices were significantly correlated with sea surface temperature (P<0.01). The species abundance index and evenness index were significantly correlated with sea surface salinity (P<0.01). 参考文献 相似文献 引证文献

黄海中南部不同断面鱼类群落结构及其多样性变化

PDF HTML阅读 XML下载 导出引用 引用提醒 黄海中南部不同断面鱼类群落结构及其多样性 DOI: 10.5846/stxb201301110084 作者: 作者单位: 中国水产科学研究院黄海水产研究所 山东省渔业资源与生态环境重点实验室,中国水产科学研究院黄海水产研究所 山东省渔业资源与生态环境重点实验室,中国水产科学研究院黄海水产研究所 山东省渔业资源与生态环境重点实验室,中国水产科学研究院黄海水产研究所 山东省渔业资源与生态环境重点实验室,中国科学院南海海洋研究所热带海洋环境国家重点实验室 作者简介: 通讯作者: 中图分类号: 基金项目: 国家国际科技合作专项资助项目（2013DFA31410）；气候变化重大基础研究资助项目（973-2013CB956503）；公益性行业（农业）科研专项资助项目（200903005）；山东省泰山学者专项基金资助项目 Variations in fish community structure and diversity in the sections of the central and southern Yellow Sea Author: Affiliation: Key Laboratory for Fishery Resources and Eco-environment,Shandong Province,Yellow Sea Fisheries Research Institute,Chinese Academy of Fishery Sciences,Qingdao,Key Laboratory for Fishery Resources and Eco-environment,Shandong Province,Yellow Sea Fisheries Research Institute,Chinese Academy of Fishery Sciences,Qingdao,Key Laboratory for Fishery Resources and Eco-environment,Shandong Province,Yellow Sea Fisheries Research Institute,Chinese Academy of Fishery Sciences,Qingdao,Key Laboratory for Fishery Resources and Eco-environment,Shandong Province,Yellow Sea Fisheries Research Institute,Chinese Academy of Fishery Sciences,Qingdao,South China Sea Institute of Oceanology, Chinese Academy of SciencesSouth China Sea Institute of Oceanology, Chinese Academy of Sciences Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:基于2006年9月和12月、2007年3月和5月对黄海中南部不同断面的底拖网调查数据，对黄海中南部不同断面的鱼类群落结构、多样性、单位时间的渔获量分布及其与环境因子的关系进行了分析。结果表明，调查中共捕获鱼类109种，其中鲈形目种类最多（45种，占40.18%），其次是鲉形目（12种，占10.71%）、鲱形目（10种，占8.93%）和鲽形目（10种，占8.93%），主要由暖温种和暖水种组成，并且暖水种和暖温种在各断面渔获量中所占的比例随时间不同而有所差异。各断面主要鱼种除小黄鱼Larimichthys polyactis、带鱼Trichiurus lepturus、银鲳Pampus argenteus等种类外，以小型中上层鱼类（鳀Engraulis japonicus、黄鲫Setipinna taty等）和底层经济价值较低的鱼类（黄鮟鱇Lophius litulon、细纹狮子鱼Liparis tanakai等）为主，各断面优势种渔获量均占其总渔获量的50%以上，主要鱼种渔获量均占其总渔获量85%以上。渔获物的营养级主要分布在4.2-4.5、3.0-3.3和3.6-3.9，各营养级渔获量随时间和断面的不同有所变化。鱼类长度谱主要集中在3-24 cm，由南向北长度谱逐渐增大。各断面鱼类群落多样性指数差异不大，与底层温度和深度关系密切。 Abstract:Based on the bottom trawl survey data by R/V "Beidou" from September, 2006 to May, 2007 in the sections of the central and southern Yellow Sea, fish community structure, community diversity, biomass distribution by catch per hour and their relationships with environmental variables were studied. A total of 109 species were collected, all of which were Osteichthyes, belonging to 86 genera, 57 families, and 16 orders. The most species-rich orders were Perciformes (45 species), followed by Scorpaeniformes (12 species), Clupeiformes (10 species), and Pleuronectiformes (10 species). The fish catch was dominated by warm water species and warm temperate species, including few cold temperate species. The proportion of species ecotypes in fish catch varied with survey time, e.g., warm water species dominated the catch in March 2007 and warm temperate species dominated the catch in September 2006. The majority of species were small-sized pelagic (e.g., Engraulis japonicus, Setipinna taty) and low-valued demersal species (e.g., Lophius litulon, Liparis tanakai), excluding Larimichthys polyactis, Trichiurus lepturus, and Pampus argenteus. Engraulis japonicus was the dominant species during four surveys, but its proportion in the total catch varied significantly with survey time. The important species composition, excluding Engraulis japonicus, Setipinna taty, Lophius litulon, and Liparis tanakai, varied rapidly during survey time, as well among the different survey areas. The important species accounted for >85% of the total catch in every survey area, and the dominant species accounted for 50% of the total catch in every area. The trophic level of fish caught in the central and southern Yellow Sea was 4.2-4.5, 3.0-3.3 and 3.6-3.9. The trophic level of the catch varied among areas, and within an area over time. These changes were closely related to the population structure in each area, and the temporal and spatial distribution of prey organisms. For example, the juveniles (which feed primarily on zooplankton) were the dominant component of the total catch in May. A shift in the trophic level as the fish grew and their feeding ecology changed. The size spectra of fish was variable (3-24 cm), particularly in section S2, and the size spectra tended to increase from the south to north, associated with differences in fish community structure and fish biological characteristics. In addition, the size spectra varied within areas over time. There was a higher proportion of individuals >48 cm in December, 2006 whereas individuals <3 cm contributed a higher proportion in May, 2007. These changes were associated with the spawning, feeding, and overwintering migrations. The majority of species spawn in May, during which time the recruiting individuals dominated the catch. Conversely, the fish catch in December was dominated by overwintering species, which were found in the changes of the size spectra of Lophius litulon, Liparis tanakai, Engraulis japonicus, Setipinna taty, and Larimichthys polyactis. There was no significant difference in the diversity indices among the sections of central and southern Yellow Sea, and section S2 and S3 were particularly comparable. Based on a comparison of historical data, there appears to be a decreasing trend in fish diversity in the central and southern Yellow Sea. Analysis of the relationships between diversity indices and environmental variables suggested that the number of fish species and diversity indices were positively correlated with sea bottom temperature, and negatively correlated with water depth. 参考文献 相似文献 引证文献

Associations between Serum 25-hydroxyvitamin D and Consumption Frequencies of Vitamin D Rich Foods in Korean Adults and Older Adults

Objectives: This study was conducted to investigate the vitamin D status and to determine the association between serum 25-hydroxyvitamin D [25(OH)D] concentrations and consumption frequencies of vitamin D rich foods in Korean adults and older adults. Methods: Subjects were 10,374 adults and 2,792 older adults participating in the 20082009 Korea National Health and Nutrition Examination Survey (KNHANES). Consumption frequencies of vitamin D rich foods were estimated by using a qualitative food frequency questionnaire (FFQ). Eleven food items such as beef, egg, mackerel, tuna, yellow corvina, pollack, anchovy, mushroom, milk, yogurt, and ice cream were selected as vitamin D rich foods based on previous research. Results: The proportions of deficiency (< 12 ng/mL), inadequacy (12-20 ng/mL) and sufficiency (≥ 20 ng/mL) of serum 25(OH)D concentrations from June to November and December to May in adults were 8.8%, 42.3%, 48.8%, and 28.2%, 52.8%, 19.1%, respectively. The proportions of deficiency, inadequacy and sufficiency of serum 25 (OH)D concentrations from June to November and December to May in older adults were 10.1%, 32.4%, 57.5%, and 24.1%, 45.4%, 30.5%, respectively. The mean serum 25(OH)D concentrations in adults were positively related to the consumption frequencies of mackerel, anchovy, all fish, milk and milk·dairy products. The mean serum 25(OH)D concentrations in older adults were positively related to the consumption frequencies of yellow corvina and negatively related to the consumption frequencies of ice cream. Conclusions: Our results suggest that Korean adults were more deficient in serum 25(OH)D concentrations than older adults. The consumption of vitamin D rich foods may affect vitamin D status in Korean adults. Further studies are required to confirm these findings.

한국 근해 쌍끌이대형저인망어업의 어장 변화

Changes in fishing ground of the large pair trawler were investigated by year, month and species off Korean waters. We used catch data by sea-block lat.<TEX>${\times}$</TEX>long.:<TEX>$30^{\prime}{\times}30$</TEX>) of the National Fisheries Research and Development Institute (NFRDI) and monthly fishing production statistics of Korean statistic information service from 1990 to 2007. In the 1990s, the demersal fish like Larimichthys polyactis, Collichthys sp, Portunus trituberculatus and Muraenesox cinereus were the dominant species, and in the 2000s, they were changed from demersal fish into pelagic fish like Scomberomorus niphonius, Scomber japonicus, Engraulis japonicus and Todarodes pacificus. Species composition of catch showed temporal variation by cluster analysis deviding into 4 period, 1990-1994, 1995-2000, 2001-2003 and 2004-2007. Fishing ground in the 2000s was decreased up to 2/3 in the 1990s, while the density of catch in the fishing ground in 2000s was higher than the 1990s.

Stock assessment of small yellow croaker in the East China Sea based on multi-source data

Integrating the standardization of abundance indices into stock assessment models to examine the population dynamics of small yellow croaker, Larimichthys polyactis, was tested through a fisheries mixture matrix constructed with multiple data types. A precautionary approach to fishery control rules was adopted based on the logistic and Fox surplus production models, incorporating data from fishery-independent surveys, fisherydependent catch-per-unit-of-effort(CPUE), and regional harvests. A risk-averse control rule, derived from model parameters and associated uncertainty, was developed to manage fisheries for maximum sustainable yield(MSY)and rapid rebuilding of overfished stocks. The proposed control rule consists of relative biomass and relative fishing mortality rate in a deterministic environment and conservative harvest in a fluctuating environment. The results of the Fox model explained 68% of the variance observed for the stock abundance, while the logistic model explained 57%. The parameter estimates were different and the Fox model predicted a much larger decrease in population abundance at the MSY, intrinsic growth rates(r), and initial exploited levels. We compared the fishing mortality/current stock biomass from 1998 to 2006 with the fishing- and stock-related reference points, respectively. The results in a determined environment revealed that small yellow croaker stock in the East China Sea was overfished in most years, while the population was not always overfished during the entire period, although its biomass has been decreasing since 1999. However, both the Fox and logistic surplus production models indicate that the small yellow croaker fishery has been consistently over harvested in the fluctuating environment. Harvesting at a conservative level with either the Fox or logistic model could increase small yellow croaker abundance substantially with little decrease in harvest. At a conservative harvest level, there is a 24.7% increase in biomass with a 6.1% decrease in yield with the logistic model and a 44.5% increase in biomass with a 9.4% decrease in yield with the Fox model. The MSY assessment results from the Fox surplus production model was more conservative than that of logistic model, which is concordant with precautionary fisheries management strategies.

Population genetic studies revealed local adaptation in a high gene-flow marine fish, the small yellow croaker (Larimichthys polyactis).

The genetic differentiation of many marine fish species is low. Yet local adaptation may be common in marine fish species as the vast and changing marine environment provides more chances for natural selection. Here, we used anonymous as well as known protein gene linked microsatellites and mitochondrial DNA to detect the population structure of the small yellow croaker (Larimichthys polyactis) in the Northwest Pacific marginal seas. Among these loci, we detected at least two microsatellites, anonymous H16 and HSP27 to be clearly under diversifying selection in outlier tests. Sequence cloning and analysis revealed that H16 was located in the intron of BAHCC1 gene. Landscape genetic analysis showed that H16 mutations were significantly associated with temperature, which further supported the diversifying selection at this locus. These marker types presented different patterns of population structure: (i) mitochondrial DNA phylogeny showed no evidence of genetic divergence and demonstrated only one glacial linage; (ii) population differentiation using putatively neutral microsatellites presented a pattern of high gene flow in the L. polyactis. In addition, several genetic barriers were identified; (iii) the population differentiation pattern revealed by loci under diversifying selection was rather different from that revealed by putatively neutral loci. The results above suggest local adaptation in the small yellow croaker. In summary, population genetic studies based on different marker types disentangle the effects of demographic history, migration, genetic drift and local adaptation on population structure and also provide valuable new insights for the design of management strategies in L. polyactis.