Mathematical analysis of morphological traits and their effects on body weight in the red crab (Charybdis feriata)

Meat yield is an important indicator of the commercial value of crustaceans. We investigated the correlations between morphometric characteristics and meat yield in Macrobrachium rosenbergii (De Man, 1879), in order to determine which traits were correlated with high meat yield. The association between morphometric characteristics and meat yield were estimated using statistical methods, including correlation coefficients, determination coefficients, path coefficients, and regression equations. In the same “family” [= cultured lineage or strain], the meat yield of males was often slightly lower than that of females. The meat yield of different male morphotypes ranged from 19.90% to 38.12%, while that of different female stages ranged from 30.14% to 35.59%. Among male morphotypes, the “small male” had the largest meat yield, and “old blue claw” had the lowest meat yield (). Among the various female developmental stages, stage I had the largest meat yield, and stage III female had the lowest meat yield (). The multivariate linear regression equation for meat yield of males contained four independent variables, and the determination coefficient was 0.744. The regression equation for females contained five independent variables, and the determination coefficient was 0.456. The characteristics that had the largest direct positive effect for meat yield were abdominal weight/body weight in males (0.862) and body length in females (0.441). These results can provide reference data for selecting M. rosenbergii with high meat yield, in order to improve the economic benefit of the prawn processing industry.

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Analysis of the morphological characteristics and direction of morphology- based selective breeding of Procambarus clarkii

Wang

Yang

Shi

et al. 2022

Preprint

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In order to explore the breeding direction of morphological selection of Procambarus clarkii, the morphological characteristics of five P. clarkii basic populations from different regions in China were comprehensively analyzed by multivariate statistical analyses. The results showed that there were significant differences in most morphological parameters among populations and between sexes. In the discriminatory analysis, the most discriminant characteristics for distinguishing females among populations were body weight (BW), first abdominal segment width (FASW), third abdominal segment width (TASW) and third abdominal segment height (TASH), whereas for males, the characteristics were body weight (BW), carapace length (CL), carapace width (CW) and third abdominal segment width (TASW).The most significant variables of the differences between sexes were body weight (BW), third abdominal segment width (TASW) and double cheliped weight (DCW). This study would be beneficial to understanding the main morphological characteristics of P. clarkii, which could provide basic data of the collected germplasm resources and some reference for indicating the direction of P. clarkii morphology-based breeding. The germplasm resources with stronger abdomen, smaller carapace and smaller cheliped would be the selection targets, and all-female breeding would also be one of important breeding directions of for P. clarkii.

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Mathematical analysis of morphological traits and their effects on body weight in the red crab (Charybdis feriata)

Cited by 4 publications

References 8 publications

Comparative analysis of growth performance between female and male mud crab Scylla paramamosain crablets: Evidences from a four-month successive growth experiment

Comparative analysis of growth performance between female and male mud crab Scylla paramamosain crablets: Evidences from a four-month successive growth experiment

Correlation between morphometric characteristics and meat yield of Macrobrachium rosenbergii (De Man, 1879) (Decapoda, Palaemonidae)

Analysis of the morphological characteristics and direction of morphology- based selective breeding of Procambarus clarkii

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