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Morphometrics, length-weight relationships and relative condition factor in Portunus sanguinolentus (Herbst, 1783) from the southeastern Arabian Sea

In: Crustaceana
Authors:
Jose Josileen ICAR — Central Marine Fisheries Research Institute, P.O. Box 1603, Cochin-682 018, India

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https://orcid.org/0000-0002-1793-2010
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Theparambil Mohamed Najmudeen ICAR — Central Marine Fisheries Research Institute, P.O. Box 1603, Cochin-682 018, India

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https://orcid.org/0000-0002-9427-5210
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Thankappan Retheesh ICAR — Central Marine Fisheries Research Institute, P.O. Box 1603, Cochin-682 018, India

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Karayil Tharayil Sadanandan Sunil ICAR — Central Marine Fisheries Research Institute, P.O. Box 1603, Cochin-682 018, India

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Manakkathara Thathi Vijayan ICAR — Central Marine Fisheries Research Institute, P.O. Box 1603, Cochin-682 018, India

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Online Publication Date:
26 Feb 2025
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Abstract

Portunus sanguinolentus is widely distributed all along the Indian coast and constitutes the most dominant marine crab landed in the country. In Kerala also, the species’ share is maximal in the marine landings and recorded an average of 1200 tonnes during 2007-2020. The bulk of the catch is contributed by trawlers and the species is mainly fished from the 20-30 m depth zone. It grows to a maximum size of 20 cm in carapace width (CW) and the estimated life span is approximately three years. Knowledge on the body weight-length/width relationships and relative condition factor in populations is important for estimating the population size of a stock and its exploitation. Hence, morphometric relationships between various characters, viz., carapace width (CW) and length (CL) and chelar propodus length (CPL) and height (CPH) in males, as well as CW and CL and abdominal width (AW) and length (AL) in females, were estimated using a total of 2476 male and 2965 female crabs. The CW/CL-weight relationship was studied in both sexes on a total of 5595 crabs using the allometric growth equation. The allometric relationships between the characters of this set suggest that most relationships are positive and highly significant ( P ⩽ 0.01). The b values for CW-weight in males (55-171 mm/CW), females (54-170 mm/CW), and pooled were 2.9657, 2.8028, and 2.8914, respectively. The results show an isometric growth pattern for males and considerable deviation from isometric growth in females, also when all sizes are pooled. An analysis of covariance indicates that there is a significant difference between sexes ( P ⩽ 0.01) with respect to the carapace width-weight relationship. The relative condition factor ( K n ) values estimated in males and females (based on CW) were 0.942 ± 0.145 and 1.371 ± 0.255, respectively, and the estimated K n values based on CL were 0.985 ± 0.204 and 1.022 ± 0.233, respectively.

Résumé

Portunus sanguinolentus est largement distribué le long des côtes indiennes et constitue le crabe principal dans les pêches de l’état. Dans le Kerala aussi, la part de l’espèce est maximale et il a été enregistré une moyenne de 1200 tonnes en 2007-2020. La majorité des captures est réalisée par des chalutiers à une profondeur de 20-30 m. La taille maximale est de 20 cm de largeur céphalothoracique (CW) et l’espérance de vie est approximativement de 3 ans. La connaissance des relations entre poids du corps, longueur et largeur et le facteur de condition relatif dans la population est importante pour estimer la taille de la population d’un stock et son exploitation. A partir d’un total de 2476 males et 2955 femelles nous avons calculé les relations morphométriques entre divers caractères, Largeur (CW) et Longueur (CL) de la carapace, Longueur (CPL) et Hauteur (CPH) du propodite de la pince chez les mâles, ainsi que Largeur et Longueur de la carapace et Largeur (AW) et Longueur (AL) de l’Abdomen chez les femelles. La relation Largeur/Longueur de la carapace — Poids a été étudiée chez les deux sexes sur un total de 5595 crabes par une équation allométrique de croissance. Les relations allométriques entre les caractères de cet ensemble suggèrent que la plupart des relations sont positives et hautement significatives ( P ⩽ 0 , 01). Les valeurs de “b” pour la relation largeur de la carapace-poids chez les males (55-171 mm/CW), les femelles (54-170 mm/CW), et le pool ont été respectivement de 2,9657, 2,8028, et 2,8914. Les résultats montrent un modèle de croissance isométrique pour les mâles et pour les femelles une déviation importante d’une croissance isométrique, de même lorsque toutes les tailles sont considérées. Une analyse de covariance montre qu’il existe une différence significative entre les sexes ( P ⩽ 0 , 01) pour la relation largeur de la carapace-poids. Les valeurs du facteur de condition relatif ( K n ) chez les mâles et les femelles (basées sur CW) ont été respectivement de 0,942 ± 0,145 et 1,371 ± 0,255, et les valeurs de K n basées sur CL de 0,985 ± 0,204 et 1,022 ± 0,233.
Title:
Morphometrics, length-weight relationships and relative condition factor in Portunus sanguinolentus (Herbst, 1783) from the southeastern Arabian Sea
Article Type:
Research Article
DOI:
https://doi.org/10.1163/15685403-bja10436
Language:
English
Pages:
213–229
Keywords:
Portunus sanguinolentus; morphometry; carapace width/length-weight relationships; relative condition factor; Arabian Sea;
In:
Crustaceana
In:
Volume 98: Issue 2
Received:
28 May 2024
Accepted:
05 Jul 2024
Publisher:
Brill
E-ISSN:
1568-5403
Print ISSN:
0011-216x
Subjects:
Carcinology, Biology

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