Growth patterns and condition index of rock oysters Saccostrea cucullata in relation to river influence in southeastern Madagascar

The ability of salmon growth hormone (sGH) to accelerate the somatic growth of juvenile abalone Haliotis discus hannai by immersion was examined. After immersion for one hour into a sGH-rich solution at a concentration of 30 mg/L, the sGH immunoreactivity in the body fluid of abalone was maximal after one day, and levels were still detectable at two days. No immunoreactivity was observed in the control group. Following immersion for one hour at one or two-week intervals for 120 weeks into the sGH-rich solution at 30 mg/L, the sGH-immersed abalone exhibited a significant increase in shell length and body weight. On the other hand, abalone immersed into a salmon prolactin (sPRL)-rich solution at 30 mg/L for one hour showed a lower increase in both shell length and body weight than the sGH-immersed abalone. No increases in shell length and body weight were observed in either the bovine serum albumin-immersed abalone or untreated controls. These results provide evidence that sGH can be transported from ambient water into the circulatory system of abalone, and can subsequently improve the somatic growth of juveniles.

Meat yield, expressed as the ratio of somatic tissue weight (flesh or meat weight) to total weight, is extensively used in the Atlantic Canadian mussel culture industry as a measure of product quality and market suitability at harvest. Atlantic Canadian mussel populations typically exhibit high genotypic variability with stocks at most sites consisting of mixtures of Mytilus edulis, M. trossulus, and their hybrids in widely varying proportions. In this paper, we examine relationships among genotypic variability, shell and somatic tissue weight, and their effect on measurement of meat yield. We further compare these relationships in populations grown from indigenous seed collection with those derived from transferred seedstock, and across different year classes within sites. Within 10 of 13 samples, M. edulis were greater than M. trossulus in shell length. Within all samples, weights of somatic tissue (flesh weight) and shell varied significantly with shell length. M. edulis typically had greater flesh and shell weights than M. trossulus. Hybrids tended to have intermediate values. Similar genotype-dependent relationships between shell weight and shell length occurred in all year classes taken from the same site. However, flesh weight relationships with shell length were inconsistent among year classes. Within-sample genotype-dependent relationships between flesh weight and shell length evident in indigenously-reared populations did not always persist in transferred populations. Meat yield was not significantly related to shell length. Meat yield was significantly greater in M. trossulus than in M. edulis in 12 of the 13 samples. Similar within-sample relationships between meat yield and genotype were evident among year classes and between indigenously-reared and transferred populations with M. trossulus having greater meat yields than M. edulis. Averaged over all samples, mean meat yield in M. trossulus was 7.4% greater than in M. edulis. Possible industry implications of these genotype-dependent differences are discussed.

Rock oysters of the genusSaccostreaare the dominating group of filter-feeding communities on rocky beaches worldwide. The edible rock oyster (Saccostrea cucullata) is used as food and fish bait along the Indian coast. Morphometric analyses ofS. cucullatafrom Baindur, Karnataka (India) were performed from June 2010 to May 2011, aiming to establish relationships between length and weight (total weight, shell weight, meat wet weight and meat dry weight). Morphometric relationships between length (L)-breadth (B) and length (L)-width (W) were B = 6.4952 + 0.4619 L and W = 3.1806 + 0.3276L, respectively. The equations of the length (L)-total weight (TW), length (L)-shell weight (SW), length (L)-meat wet weight (WW) and length (L)-meat dry weight (DW) were TW = 0.001227L2.3973, SW = 0.001165L2.3164, WW = 0.000037L2.1327and DW = 0.000030L2.3289, respectively. The allometric growth pattern revealed changes in shell shape and weight variation throughout ontogeny in rocky habitats. The condition index and meat yield ofS. cucullataexhibited seasonality, with higher values recorded during the periods post-monsoon and pre-monsoon.

The growth of the northern quahog, Mercenaria mercenaria, has been mathematically modeled over both the nursery stage and the complete life so as to develop expectations of growth as a function of environmental suitability. Then, the growth of northern quahogs in an experimental nursery upweller was evaluated as a function of system operating parameters (flow rate and stocking density) and other environmental parameters to determine the limiting factors in this critical phase of shellfish aquaculture. The von Bertalanffy growth equation was used to predict increases in shell length (millimeters), weight (grams), and the relative growth rate (% increase per day) at various instantaneous growth coefficients (K). The relative growth rate (RGR) was also determined over a number of time intervals, including 1, 4, 7, 14, and 28 days. The age at which the maximum shell length and weight was reached varied with K. A higher K (0.30) resulted in rapid growth and an earlier asymptote, while a lower K (0.20 and 0.10) resulted in slower growth and a later asymptote in the animal's maximum shell length and weight. The RGR averaged over an annual time interval (annual RGR), as predicted by von Bertalanffy, decreased rapidly as the northern quahog aged, approaching 0.5 % increase/day after age 2. Annual RGR at different K values was similar, indicating that RGR was insensitive to changes in K. During the first growing season (210 days in the northeast), the increase in shell length predicted by von Bertalanffy was linear with a slope determined by K, that is, a greater slope results in a higher K. A similar relationship was apparent with weight. The RGR, however, varied greatly during the first growing season. Specifically, the RGR was 11% increase/day at 90 days after spawning and 2% increase/day at 210 days after spawning. The RGR at different K values was also insensitive to changes in K. There were no detectible differences between RGR determinations at a K of 0.10, 0.20, and 0.30 with varying time intervals (T); however, the value of RGR at a given point in time varied substantially with the time interval used to calculate RGR. The larger the growth interval, the larger the RGR. The a and b coefficients estimated for the weight-length relationship from the adult and nursery stage northern quahogs differed from each other and published measures from Narragansett Bay northern quahogs. This suggests that researchers should use data collected from

This study investigates the influence of variable environmental conditions on the growth of the natural rock oyster (hooded oyster) Saccostrea cucullata in the river-fed Ambinanibe coastal lagoon (Madagascar), with the objective to establish sites with optimal growth conditions for aquaculture purposes. Specimen marked with manganese were placed in cages over an approximately one-year period. The cages were installed at four sites i.e. one at the river mouth, two sites within the main lagoon and one site in an adjacent connected lagoon, which is out of river influence and considered as the control site. Multiple mark and recapture experiments were used to investigate the variations in growth rate and condition index (tissue weight/shell weight). The results show that the species overall exhibits a fast growth rate at a young age, with a gradual growth reduction with age. The hinge growth rate shows important spatial and seasonal variations in the lagoon. Oysters from the site located at the river mouth have the highest hinge growth rate (20.5 ± 13.6 µm d−1) and condition index (4.5 ± 2.8 %) while those from the control site out of river and ocean influences exhibit the lowest hinge growth rate (7.7 ± 4.2 µm d−1) and condition index (0.7 ± 0.6 %), suggesting that river freshwater inflow provides suitable environmental conditions for oyster growth and a profitable oyster farming is thus feasible. River inflow is an important external source of nutrients, providing thus a significant food source (phytoplankton), as well as suitable temperature and salinity conditions for S. cucullata in this lagoon. Overall, our results show that oyster market size (shell length: 40 mm) in Madagascar can be reached faster at the river-influenced site (in 8 months) in comparison with the other sites (in 1 – 1.2 years), indicating that the river-impacted site is well suitable for oyster farming.

Juvenile and adult mussels of Lamprotula fibrosa which were reared from 1995 to October, 200l. The mussels were from collected from on-growing fish ponds of Aquatic Experimental Station in the Fisheries College, Huazhong Agricultural University and the ponds which are connected to Wanghu Lake, Yangxin,Hubei. 2085 mussels were collected by harrow. For identifying the age exactly, L. fibrosa were cultured for three years in those ponds where they were collected to validate that the mussels grow to one or two growth rings once a year. Before experiment, shell length was measured, gaps were sawed by saw blade and the last growth ring was marked. The steps were repeated for three years. The amounts of growth ring were gained according as the thickness and the convolve or protruding of the annular line in the shell exterior and they were observed by naked eyes and noted. The ages were confirmed by new growth rings in the shell exterior of L. fibrosa reared in the ponds for one year. From the vertical side of the shells, the shells of L. fibrosa were composed by shell layers of bright and dark. The bright layer and the dark layer consisted with the annular lines which have a group of hollow and protuberant in the shell exterior respectively. It is the annual rings. Observing the growth rings in the shell exterior through naked eyes, the annual lines in shell exterior which are thick and hollow are the growth rings or annual rings. Those thin and protuberant lines are annual growth lines and not growth rings or annual rings. This can be validated by the amounts of the layers which have bright and dark lines in the vertical side of the shell. The ages of L. fibrosa can be identified effectively through the growth rings of the colony layer and the pearl layer after the keratode layer or colony layer were wore away by grinding wheel. L. fibrosa increased one growth ring once a year. The structure analyze shows that L. fibrosa in Wanghu Lake were 29 age groups. The proportion of 7—10 ages is 33.48% and that of 1—15 ages is 46.09%. Their shel1weight accounts for 22.34% and 48.53% of whole shell weight, respectively. Their body weight accounts for 22.69% and 47.40% of Who1e body weight, respectively. L. fibrosa of 7—15ages covers most capture of those in Wanghu Lake. Dominant shell length is 7.15—10.64cm. Dominant shell weight is 99.40—160.62g. Dominant body weight is 126.04—276.09g. Annual ring can be identified by observing the sunken growth rings on the shell surface by eyes, and annual ring can be verified by observing the shell layers in shade and light check after opening shell longitude inner section and by observing growth rings in the prismatic layer and the pearl layer after polishing the shell. Before 10 ages,L. fibrosa grows faster than it does after 10 ages. Before 10 ages, the relations between age (A) and shell length (L) is linear correlated. The relationships between age (A) and shell weight (WS), body weight (W) all are power function correlated. The equations of regression before10 ages respectively are: L=0.8600+0.8980A (r=0.9883) WS=1.0175A 2.3399(r=0.9997) W=1.3188A2.3333(r=0.9997). After 10 ages, the relationship between age and shell length, shell weight, body weight are linear correlated. The equations after 10 ages are: L=7.9085+0.1817A(r=0.9813) WS=61.1930+10.7720A(r=0.9902) W=78.8690+13.6960A(r=0.9903). The relationship between shell length and shell weight, body weight are power function correlated. The correlative equations are: WS=0.6303L2.4846(r=0.9999) W=0.8181L2.4775(r=0.9999) The shell weight is linearly related to body weight, and the equation is:W=0.3560+1.2744WS(r=0.9999).  

This study investigates the allometric relationships between shell length, width, height, and weight of Donax sp. collected from Sungai Janggut (on 7 May, 2024), Malaysia, across three groups (Group 1: N=429; Group 2: N=342; Group 3: N=329; Group All: N=1100). Pearson's correlation analysis revealed significant differences among the groups, with Group 3 displaying strong positive correlations among allometric parameters, particularly between shell length, width, and weight, indicating optimal growth conditions. Conversely, Groups 1 and 2 exhibited weaker correlations, suggesting growth disruptions likely due to environmental stressors or suboptimal habitat conditions. Factor analysis further confirmed these patterns, with shell length and width as primary contributors to shell weight, while shell height showed negative or minimal influence. Multiple regression analysis identified shell length as the dominant predictor of shell weight, particularly in Group 3, followed by shell width, while height contributed negatively in most groups. The results provide ecological insights into the adaptive strategies of Donax sp. under varying environmental pressures and highlight their role as bioindicators of ecosystem health. From a coastal conservation perspective, these findings underscore the need to protect intertidal habitats to sustain Donax sp. populations and the essential ecosystem services they provide.

Shell morphology, radular length, and wet weight of soft parts were compared between three species (Collisella pelta, Collisella persona, and Collisella scutum) from one geographic locality. Shell length vs. shell height, wet weight of soft parts vs. radular length, and shell length vs. radular length are statistically significant relationships to separate the three species. Shell weight vs. wet weight of soft parts, wet weight of soft parts vs. extravisceral space, and shell volume vs. wet weight of soft parts are statistically significant relationships to separate C. scutum from either C. pelta or C. persona. These comparisons do not separate C. pelta from C. persona. Shell length vs. shell width, shell length vs. shell volume, and shell length vs. shell weight were found not to be statistically significant relationships to separate the three species. The importance of using shell length and wet weight of soft parts as a measure of animal growth is discussed.

Suitability of two seaweeds, Gracilaria lemaneiformis and Sargassum pallidum, as feed for the abalone Haliotis discus hannai Ino

Wedge clam,Donax scortumoccurrence was studied from February 2009 to January 2010 in Padukere sandy beach, Karnataka (India). The following biological parameters were measured in 2367 individuals of the wedge clam,Donax scortum: length, breadth, width, total weight, shell weight, wet meat weight, dry meat weight and number of clams. The calculated linear equation of length-breadth and length-width relationships wereB= 3.5968 + 0.5421L andW= 0.8191 + 0.4345L respectively. The length-total weight, length-wet meat weight, length-dry meat weight and length-shell weight relationships were 0.0001414L3.0224,W= 0.0000037L3.5204,W= 0.0000011L3.4513and 0.0000852L2.9912respectively. The values of correlation coefficient for different shell dimensional relationships were very close to unity. It was clear from the study that the most ideal period for clam harvest was April, June and December, especially when condition index was maximum. Length showed a strong correlation with silt and clay. Dry meat weight was negatively correlated with air temperature. Shell weight showed positive correlation with length, breadth, width and dry meat weight, and abiotic parameters, silt and clay. Condition index was positively correlated with electrical conductivity, whereas it was negatively correlated with dissolved oxygen. It showed a strong positive correlation with salinity. Seasonal fluctuation of condition index inD. scortumwas probably related to reproductive activity. The harvesting of wedge clam could be carried out considering the maximum sustainable yield without over-exploitation

This study aimed to investigate some morphological features and heavy metal accumulation in muscle tissue of Ruditapes decussatus (Linnaeus, 1758) in the spring and autumn seasons of 2018 in the Yumurtalık Coastline of İskenderun Bay located in the northeastern Mediterranean Sea. To this end, shell length (SL), total weight (TW), shell height (SH), shell inflation (SI), shell weight (SW), roundness index (RI), cup index (CI) and total length-weight relationship (LWR) of Bivalvia and heavy metal accumulation in the muscle tissue of Bivalvia were measured for two seasons. Minimum and maximum values of SL, TW, SH, SI, SW, RI and CI were determined as 21.50-39.00 mm, 0.80-22.15 g, 10.50-28.70 mm, 9.11-20.90 mm, 3.08-4.66 g, 1.03-2.14 and 0.58-0.67 respectively. The relationship between total length and total weight of R. decussatus was calculated to be W=0.0052*SL2.54 for spring and W=0.0031*SL2.88 for autumn. The growth type of Bivalvia specimens was determined as isometric growth (2.971). Heavy metal accumulation in the muscle tissue in spring and autumn seasons was found as statistically significant only for zinc and copper in different seasons (P

BackgroundAlthough the apple snail Pila globosa is used as indicator species for human consumption locally and as fish feed, research on it in general is very scanty. It is used in food industry, in aquaculture as fish bait and used as food in many regions of India and many other countries, but research on it has been started in the 1970s. Only 40 articles are available on this organism in PubMed indicating an urgent need of basic research on it especially work on its spatiotemporal morphometry Therefore, sampling of P. globosa was done from different parts of India in different seasons (summer, winter and rainy), and different morphometric studies were performed on this organism to draw baseline information. Analysis was conducted to study morphometry, the relationship between shell length and the weight and relative condition factor of Indian apple snail Pila globosa collected from five zones (east, west, north, south and centre) of India during 2018–2019 year.ResultsThe shell length (SL) (46.5 ± 13.33), shell width (SW) (40.22±11.5 mm), spire length (SPL) (2.99±0.15 mm), base length (BL) (12.53±2.94 mm), aperture length (AL) (21.95±4.36 mm), aperture width (AW) (2.74±0.47 mm) and shell weight (WT) (31.08±13.76 g) were observed to be varied among the individual sampled across India. Different relationships for SL/SW (Log SW=0.9889 Log SL + 0.9444), SL/SPL (Log SPL = 0.1452 Log SL+0.3815), SL/BL (Log BL=0.7789 Log SL+0.5814), SL/AL (Log AL= 0.6518 Log SL+0.9111) and SL/AW (Log AW=0.4475 Log SL+0.1422) were observed by considering shell length as basic index. The relationship between shell length and shell weight was found to be Log WT=2.0263 Log SL+0.1098. The relative condition factor revealed uninterrupted and good environmental condition observed for apple snails. A negative allometric growth pattern was observed from the length–weight relationship.ConclusionThe environments of apple snail in India are not contaminated, and the results can be used as baseline data in aquaculture for model analysis and can be used as a reference for drawing relationship among different morphometric indices of P. globosa in India, as there is no such information available on it. The data can also be used for mass scale production of P. globosa for consumption by human and use in aquatic industries as fish feed.

The growth and condition index of kalandue shellfish in the mangrove forest of Kendari Bay, Southeast Sulawesi is not fully known. This study aims to determine the growth and condition index of kalandue shellfish (Polymesoda erosa) in Kendari Bay, Southeast Sulawesi. Kalandue mussels were taken randomly throughout the waters using a shovel as deep as 20 cm in the aquatic substrate. Kalandue mussels were measured in length and wet weight was measured using a caliper and a digital scale with an accuracy of 0.5 mm and 0.01 g, respectively. The shells were separated by sex and dried in an oven at 70oC for 72 hours. Kalandue mussels were weighed dry and shell weight using an analytical balance with an accuracy of 0.0001g. The length-weight relationship data were analyzed using linear regression and the condition index was analyzed using the Mann Whitney test. The results showed that the length-weight relationship of males and females was in isometric conditions with values of 3.08 and 3.05, respectively. The lowest b value was found in February and the highest was in May. The condition index of male and female caladue shells was not significantly different with values of 9.26±5.50 and 6.75±4.90, respectively. The condition index experienced two peaks, namely in May and September. Furthermore, the condition index of kalandue mussels increased along with the increase in body size (shell width).

PDF HTML阅读 XML下载 导出引用 引用提醒 壳白长牡蛎品系生长和壳色性状遗传参数估计 DOI: 作者: 作者单位: 中国海洋大学, 海水养殖教育部重点实验室, 山东 青岛 266003 作者简介: 邢德(1992-),男,硕士研究生,从事贝类遗传育种研究.E-mail:xingzhidezhi@126.com 通讯作者: 中图分类号: S917 基金项目: 国家自然科学基金项目（31372524）；泰山学者种业计划专家项目；山东省科技发展计划项目（2016ZDJS06A06）. Estimates of genetic parameters for growth and shell color traits in the white-shell strain of Pacific oyster (Crassostrea gigas) Author: Affiliation: The Key Laboratory of Mariculture, Ministry of Education;Ocean University of China, Qingdao 266003, China 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:以经过连续4代家系选育获得的壳白长牡蛎（）选育系为亲本，通过巢氏平衡设计建立了30个全同胞家系混合养殖，采用微卫星多重PCR技术进行家系鉴定，基于REML法估算24月龄壳白长牡蛎的生长性状和壳色性状的遗传参数。结果表明，壳白长牡蛎品系壳高、壳长、总重、壳重、（黄蓝轴色品指数）的遗传力为中高等水平，依次为0.35±0.13、0.18±0.09、0.20±0.09、0.16±0.08、0.16±0.08、0.27±0.11和0.19±0.08，壳宽、肉重、出肉率、壳型指数的遗传力为低等水平，依次是0.07±0.02、0.11±0.06、0.02±0.03、0.08±0.06和0.11±0.06。壳高、壳长、壳宽、总重、壳重和肉重之间的遗传相关和表型相关均为正相关，其中，壳高、壳宽和总重与其他生长性状的相关性较高，分别为0.40±0.65~0.90±0.14、0.39±0.55~0.97±0.24和0.50±0.66~0.99±0.02。壳型指数与壳高均为较高的负相关，分别为-0.94±0.16和-0.77±0.19，表明仅以壳高性状为选育目标时，可能不会对长牡蛎壳型改良产生作用。壳白长牡蛎壳色参数与生长性状之间的遗传相关范围为-0.09±0.42~0.91±0.74，不同性状间的遗传相关差异很大，其中*任一个为选育目标时，其他生长性状都可以获得提高。壳色参数间与相关性较低，分别为-0.08±0.36和0.21±0.31，表明以值。本研究为合理制定壳白长牡蛎新品系育种方案和选择反应预测提供了参考依据。 Abstract:The Pacific oyster () is the most widely cultured shellfish in the world. There is considerable focus on improving selective breeding procedures for economic traits. We used specimens of the white-shell strain of after four generations of family selection as parents to construct 30 full-sib families in a nested design. A mixed family approach combined with parentage analysis using highly polymorphic microsatellite makers and REML based on the animal model was used to estimate genetic parameters of white-shell at the age of 24 months. The results showed that heritabilities of shell height, shell length, total weight, shell weight, were 0.35±0.13, 0.18±0.09, 0.20±0.09, 0.16±0.08, 0.16±0.08, 0.27±0.11, and 0.19±0.08, respectively. Shell width, meat weight, meat ratio, and indexes of shell shape showed lower heritabilities of 0.07±0.02, 0.11±0.06, 0.02±0.03, 0.08±0.06, and 0.11±0.06, respectively. All phenotypic and genetic correlations among shell height, shell length, shell width, total weight, shell weight, and meat weight were positive. Genetic correlations were higher between shell height, shell length, total weight, and the other growth traits, ranging from 0.40±0.65 to 0.90±0.14, 0.39±0.55 to 0.97±0.24, and 0.50±0.66 to 0.99±0.02, respectively. Genetic correlation between index A of shell shape and shell height was -0.94±0.16, and -0.77±0.19 between index B of shell shape and shell height, suggesting that shell shape would not change if just shell height were selected in breeding programs. Genetic correlations were significantly different between shell color traits and growth traits, varying from -0.09±0.42 to 0.91±0.74. Higher genetic correlations between * (the same as shell height, shell length, and total weight) could improve other growth traits. There was a negative genetic correlation between of -0.96±0.04. Conversely, genetic correlations were lower between and could also decrease . This information will benefit genetic improvement of the white-shell strain of . 参考文献 相似文献 引证文献

In situ growth rates were determined, using two, 1-yr mark/recapture experiments, conducted between September 1991 and July 1993, for an undescribed mytilid, Seep Mytilid Ia, at three hydrocarbon seep sites in the Gulf of Mexico. The sites are located at depths of 540 to 730m, approximately 27°45′N; 91°30′W, and are separated by distances of 6 to 18 miles. These seep mytilids harbor methanotrophic endosymbionts and use methane as both a carbon and energy source. The mussel habitats were chemically characterized by analysis of water samples taken from precisely located microenvironments over, among and below the mussels, using small-volume, interstitial water samplers and the “Johnson Sea Link” submersible. Substantial differences were found in habital conditions, growth rates, and population structure for the mussels at the three sites examined. The growth rate of these seep mytilids reflects the methane concentration in their immediate habitat. Mussels at sites with abundant methane had growth rates that were comparable to shallow water mytilids at similar temperatures (5 to 8°C) with increases in shell length up to 17 mm yr−1 documented for smaller mussels (<40 mm shell length). In conjunction with measurements of growth rates, three condition indices (glycogen content, tissue water content, and the ratio of ash-free dry weight to shell volume) were used to determine the relationship between the condition of the mussels, their growth rates, and their habitat chemistry. The three condition indices were correlated with growth rate and were often significantly different between mussels in different samples.