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Stock structure analysis of the declining shovel-nosed lobster Thenus unimaculatus (Burton and Davie, 2007) for effective management and conservation along the Indian coast: Morphometry of Thenus unimaculatus

Indian Agricultural Research Journals

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Title Stock structure analysis of the declining shovel-nosed lobster Thenus unimaculatus (Burton and Davie, 2007) for effective management and conservation along the Indian coast: Morphometry of Thenus unimaculatus
 
Creator Chakraborty, Rekha Devi
P. T. Sarada
Dash, Gyanaranjan
Kumar, Rajan
Divipala, Indira
M. Rajkumar
G. Kuberan
S. Sreelakshmy
G. Maheswarudu
 
Subject LDA, Putative stocks, Slipper lobster, Truss, Population structure
 
Description The  shovel-nosed lobster Thenus unimaculatus (Burton and Davie 2007) is one of India’s most important commercially exploited lobster species. The declining trends and collapse of the sand lobster fishery have been reported from the north-west coast of India. Several hypotheses have been proposed to explain this decline, but a lack of basic information on population demographics inhibits hypothesis testing. This study attempted morphometric stock structure analysis of T. unimaculatus along the Indian coast, using 673 specimens collected from five locations during 2017-2019. Data was subjected to allometric transformation to remove size effect and further subjected to multivariate analysis, including principal component analysis (PCA) followed by linear discriminant analysis (LDA) using R software. The first eight principal components (PCs) cumulatively explained 73.97% of the total variance. The misclassification rate (MR) of the LDA model performed to optimise separation among different sampling locations and coasts were 0.30 and 0.26 respectively, indicating clear overlap of the stocks. The results of this study revealed the presence of a single spawning stock of shovel-nosed lobster along the Indian coast, providing insights for adopting holistic management strategies to conserve this declining resource.
Keywords: LDA, Population structure, Putative stocks, Slipper lobster, Truss
 
Publisher Central Marine Fisheries Research Institute (on behalf of Indian Council of Agricultural
 
Date 2024-06-30
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
 
Format application/pdf
 
Identifier https://epubs.icar.org.in/index.php/IJF/article/view/139064
10.21077/ijf.2024.71.2.139064-01
 
Source Indian Journal of Fisheries; Vol. 71 No. 2 (2024)
0970-6011
 
Language eng
 
Relation https://epubs.icar.org.in/index.php/IJF/article/view/139064/54938
 
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