Determination of biometric and somatic parameters of Rhyssoplax olivacea (Polyplacophora: Chitonidae) on the Algerian west coast, Mediterranean Sea: Implication for management and conservation

To reveal the influence of shell traits between two shell colors on the body and soft tissue weight of the clam Cyclina sinensis, a total of 1000 individuals (500 with white shells and 500 with purple shells) were randomly selected to analyze the effects of shell length, shell height, shell width, ligament length, and shell weight on the body and soft tissue weight. The results indicated that the shell traits of the clam were significantly correlated with the total weight and the soft tissue weight at an extremely significant level (P < 0.01). Shell height was the main determinant of total body weight and soft tissue weight in the white shell group and the mixed group. Shell length is the main characteristic that determines the total weight and soft tissue weight of the purple shell. The optimal multiple regression equations with total weight and soft tissue weight as dependent variables and other characteristics as independent variables were established for the two shell color groups of C. sinensis. The results provided a theoretical basis for the breeding and production of the clam.

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.

Information on allometry, condition indices (CIs), and biometric traits (BTs) of marine bivalves are necessary for determining the growth pattern and the size at which harvest can be intensified to maximize production in aquaculture. These parameters of marine bivalves are largely regulated by the complex interactive effects of various ecological and physiological factors. Therefore, the present study aimed to apply an integrated multivariate approach to explore a comprehensive knowledge about how allometry, condition indices (CIs) and BTs are interlinked with various eco-physiological factors of cultured green mussel (Perna viridis), with a particular focus on the effect of seasonality. Six selected length-weight dimensions (shell length, shell width and shell height against total weight and soft tissue weight) were proved to be positively correlated with negative allometric relation (slope<3) by regression analysis in male, female and sexually undifferentiated individuals. Linear discriminant function analysis (LDFA) displayed that CIs and BTs of green mussel were not differentiated by the sex, rather evidenced a pronounced discrimination by the seasonality and reproductive cycle. The correlation analysis demonstrated that different CIs and BTs were significantly correlated with different ecological factors, ingested plankton and gonadosomatic index (GSI) of the green mussel. Taken together all datasets, the principal component analysis (PCA) showed that seasonality and reproductive cycle explained>60 % of the variability. In both cases, PCA analysis further revealed that CIs and BTs increased with the increase of salinity, dissolved oxygen, food availability, plankton ingestion and GSI value, while they decreased with the increase of temperature, current speed and turbidity. Thus, our results clearly demonstrated that CIs and BTs of the green mussel were influenced by seasonality, ecological factors, plankton ingestion and reproductive cycle of the species. The findings of the present study represent a step toward a better comprehension of the CIs and BTs of P. viridis in relation to different eco-physiological factors and would be helpful to determine the ideal period for commercial exploitation, biodiversity conservation and future potential aquaculture of this commercially important species to a greater extent.

Pacific abalone (Haliotis discus hannai) is one of the most valuable aquaculture species in China. However, the rapid development of the aquaculture industry has caused problem of germplasm degeneration. It is important to carry out genetic improvement of economic traits for H. discus hannai. This study was conducted to estimate genetic parameters of growth traits in Pacific abalone to provide a database for selective breeding programs. Data of 10 growth-related traits—shell length (SL), shell width (SW), shell height (SH), shell weight (SWT), wet weight (WW), foot muscle weight (MW), soft tissue weight (STW), visceral mass weight (VW), foot muscle weight/wet weight ratio (MWR) and soft tissue weight/wet weight ratio (SWR)—were collected from 1059 adults sampled from 115 families. Significant growth differences existed between abalone under different culture modes. Abalone with red shell colour presented poorer growth performance than the normal shell colour group, and their hybrids displayed mid-parent heterosis. The heritability values of SL, SW, SH, SWT, WW, MW and STW were 0.65 ± 0.06, 0.63 ± 0.06, 0.51 ± 0.08, 0.59 ± 0.09, 0.54 ± 0.05, 0.43 ± 0.08 and 0.43 ± 0.08, respectively, indicating high heritability. The heritabilities of VW and MWR were moderate, with estimates of 0.36 ± 0.07 and 0.21 ± 0.06, respectively, and SWR had low heritability with value of 0.17 ± 0.06. Genetic and phenotypic correlations among the growth traits were positive, in the ranges 0.24–0.99 and 0.12–0.99 respectively. Genetic correlation coefficients among most of the growth traits were close to or higher than 0.9. The results of this study demonstrate the genetic improvement potential of Pacific abalone in selective breeding. Traits such as SL, SW, SH and WW could be selected and improved simultaneously.

A first study on the bioaccumulation of trace metals in Rhyssoplax olivacea (Mediterranean Polyplacophora)

Background:Obesity leads to other fatal diseases like diabetes, cardiovascular diseases, depression, and some forms of cancer. Still, the well-known tool to measure obesity is the body mass index. But it usually failed in the measurement of adipose tissues. So, we present a novel anthropometric measure, called body shape and size index which is developed by the combination of major anthropometric determinants: body surface area, body mass index, weight, and height.Methods:This study is based on cross-sectional data consisting of 7224 individuals that were taken from the city Multan, Punjab, Pakistan. All the individuals, both males, and females, of age 2 years and above were included in the study except the pregnant women. The variables included in this study are gender, area (urban and rural), age (years), weight (kg), and height (meters). Growth charts of quantile regression are used for the inferential analysis of data. Comparison of proposed body shape and size index at different obesity levels has also been made to access the relationship of proposed body shape and size index with obesity.Results:The results show that the proposed body shape and size index has a great association with body surface area, body mass index, weight, height, and age. The proposed body shape and size index has a high negative association with body surface area, moderate negative association with body mass index and weight, and low negative association with height and age. According to growth charts of body shape and size index, after the age of 25 years, body shape and size index curves go upward while it smoothly goes downward at the age of 50 years but decreases in earlier ages. Body shape and size index showed a significant association with body shape and body size (body development) at the same time.Conclusion:Body shape and size index is found, generally linear with age, and increased with decreasing body mass index and body surface area. The proposed index has an indirect relationship with obesity. Body shape and size index with low values indicates a high risk of obesity. While, however, body shape and size index with high values indicates a low risk of obesity. Applications of the proposed body shape and size index are also presented in statistical modeling.

Saccostrea cucullata is the dominant species of rock oyster (family Ostreidae) in southeastern Madagascar. Despite its economic and ecological importance, information on its biology and ecology is scarce. This study investigated the growth, shell length–weight relationship, and condition index (tissue dry weight/shell dry weight) of S. cucullata in the Ambinanibe coastal lagoon system. Oysters were placed in cages and deployed at four sites: one site at the Efaho River mouth emptying into the main lagoon, two sites within the main lagoon (Ambinanibe lagoon), and one site out of river influence (Andranasy lagoon). Shell length, shell weight and the condition index were monitored at each site over one year. The results show significant increases in shell length and shell weight during the study period. The relationship between shell length and weight was nonlinear and best described by a power equation. The b value of the length–weight relationship ranged between 1.01 and 1.76, which is comparable to values reported in other studies. Oysters from the site at the river mouth exhibited the highest condition index (4.50 ± 2.82%), while those from the site out of river influence had the lowest (0.72 ± 0.55%), suggesting that freshwater inflow creates favourable environmental conditions for producing high-quality, marketable oysters. Overall, this study makes an important contribution to the current knowledge on the morphometric characteristics and growth parameters of S. cucullata in coastal zones. The findings provide valuable insights for developing effective conservation strategy and optimising the farming of this species, in this region and beyond.

Duas espécies de Mytella ocorrem no estado de Sergipe, M. charruana e M. bicolor, sendo ambas explotadas, porém em proporção desconhecida. Um dos primeiros passos para se avaliar corretamente a importância de cada uma das espécies na economia local é avaliar o rendimento em carne. Assim, o presente trabalho foi concebido com o objetivo de avaliar o rendimento em carne e ao mesmo tempo as relações morfométricas de ambas as espécies. Foram coletadas amostras mensais de aproximadamente 2 kg para cada espécie nos meses de abril a junho de 2014. As relações entre a largura (LC) e o comprimento (CC) da concha estimadas para M. charruana e M. bicolor foram LC = 0,3391 CC + 3,7965 e LC = 0,3934 CC + 5,1308, respectivamente. As relações entre a altura (AC) e o comprimento (CC) da concha foram AC = 0,3546 CC – 1,9146 e AC = 0,2977 CC + 1,1267, respectivamente. Finalmente, as relações entre o peso total (PT) e o comprimento da concha (CC) foram PT = 0,0004 CC2,3976 e PT = 8E-05 CC2,8437, respectivamente. Em todos os casos, foi observada uma diferença estatisticamente significante na relação para ambas as espécies, havendo no geral uma alometria negativa. O rendimento médio de carne in natura para M. charruana e M. bicolor foi de 50,3 e 33,2%, respectivamente. Dessa forma, para obter um quilo de carne (catado) seria preciso coletar aproximadamente 2 kg de indivíduos inteiros (carne e concha) de M. charruana e 3 kg de M. bicolor.

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.

Genetic and phenotypic parameter estimates for measurement traits were obtained from pacific oyster Crassostrea gigas at nine months old. For the growth-related traits among nine months old pacific oyster, heritabilities of shell length, shell height, shell width, total weight, body weight and shell weight were estimated as 0.4855, 0.5248, 0.0884, 0.7236, 0.7726 and 0.6957, respectively. Genetic correlations among the growth-related traits of pacific oyster at nines month old, shell length, shell height, shell width, total weight, body weight, shell weight were showing highly positive correlations. Breeding value on growth-related traits of pacific oyster at nine months old were estimated as shell length -7.044-11.870, shell height -11.380-18.370, shell width -1.234-2.831, total weight -8.339-17.140, body weight -1.813-3.507 and shell weight -4.422-8.837. The results show that there is quite substantial additive genetic variance for measurement traits in pacific oyster that can be exploited through selective breeding.

We analyzed 5 economic traits including 3 morphological traits ( shell length, shell height and shell width) and 2 weight traits ( body weight and edible-part weight) of 80 randomly selected wild Trachycardium flavum by path analysis and multiple regression analysis. Results show that the phenotype correlation coefficients among the 5 measured traits reach very significant level ( P < 0. 01) . Shell length, shell height, shell width and edible-part weight have indirect effects on body weight but through mainly edible-part weight ( 0. 704 8) . With shell height excluded for its insignificant partial regression coefficient, we obtained the best multiple regres- sion equation between body weight and shell length, shell width and edible-part weight. Among the morphological traits, shell width af- fects edible-part weight most with the direct correlation coefficient of 0. 409 3. Shell length has indirect effect on edible-part weight through mainly shell width. Finally, we established the multiple regression equation between edible-part weight and shell length and shell weight with shell height excluded. The research provides theoretical basis for the germplasm resource protection and selective breeding of T. flavum.

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

The Pacific oyster, one of the most widely grown bivalves, has a long commercial history, a large consumer base, and is one of the most important commercially cultured mollusks in the world. Only the soft body is edible therefore increasing the soft-body wet weight (SBWW) is the main breeding objective for oysters. The SBWW cannot be measured in-vivo. In general, the shell height (H) or shell length (L) are used to indirectly choose SBWW. But they are diverse and susceptible to environmental influences so they are not indicative of higher SBWW and inappropriate for the selection of optimal brooders. In this study, H, L as well as shell width (W) of wild and cultured populations were measured and the correlation coefficients between H, L, W, HLW (the arithmetic index based on shell height, length and width) and SBWW were calculated and found to be potential indicators for selective breeding of SBWW in Pacific oyster.

Background: Physical indices and proportions based on anthropometry are crucial for determining the performance of players in team sports. The study aims to analyze the anthropometric status, body mass and shape indices, including waist-to-hip and height ratios, among athletes from different team sports.&#x0D; Methods: Study involved 135 male team-sport athletes specializing in basketball, handball, and volleyball, with 45 players in each sport. Researchers collected anthropometric data, including chronological age (CA), height (Ht), weight (Wt), body mass index (BMI), waist circumferences (WC) and hip circumferences (HC), waist-hip ratio (WHR), waist-height ratio (WHtR), and a body shape index (ABSI). To compare variables across groups, descriptive statistics and one-way ANOVA with LSD post-hoc tests used. Relationships within each group were examined using correlation analysis.&#x0D; Results: The ANOVA findings indicated f values (2, 132) for CA at 0.57, p=0.57, BMI at 0.59, p=0.56, WC at 2.10, p=0.13, WHR at 1.37, p=0.27, and ABSI at 1.41, p=0.25, respectively, revealing no significant disparities among the groups. Conversely, Ht at 13.36, p=0.00, Wt at 5.74, p=0.00, HC at 6.33, p=0.00, and WHtR at 3.60, p=0.03, respectively, highlighted significant variations between the groups. Furthermore, the correlation of BMI, WC, HC, WHR, WHtR, and ABSI in each group showed a strong positive correlation (p&lt;0.01).&#x0D; Conclusions: Athletes in team sports were found to have similar body mass and shape indices, including ratios for WHR, while the WHtR ratio showed significant variations among the groups. Despite these differences, measures of athletes’ health metrics across these sports remain within safe, normal ranges.

Genetic mapping of size-related quantitative trait loci (QTL) in the bay scallop (Argopecten irradians) using AFLP and microsatellite markers