Carapace Length–Weight, Carapace Width–Weight Relationships and Relative Condition Factor of Four Portunid Crab Species of the Gulf of Mannar, Southeast Coast of India
Carapace Length–Weight, Carapace Width–Weight Relationships and Relative Condition Factor of Four Portunid Crab Species of the Gulf of Mannar, Southeast Coast of India
Adyasha Sahu1*, V. K. Venkataramani1, Natarajan Jayakumar1,
Durairaja Ramulu1, Preetysh Nanda Patnaik1 and Sudhan Chandran2
ABSTRACT
Carapace Length–Weight (CLW) and Carapace Width–Weight (CWW) relationships by sex, combined with Relative Condition Factor (Kn) are presented for four commercially important portunid crab species viz., Portunus pelagicus (Linnaeus, 1758), Portunus sanguinolentus (Herbst, 1783), Portunus gladiator Fabricius, 1798 and Charybdis natator (Herbst, 1794) collected from the Gulf of Mannar, Southeast coast of India. A total of 1,391 specimens were collected and measured from January to June 2022. All CLW and CWW relationships were linear (R2 >0.95 and R2 >0.91 respectively). The slope (b) of the CLWR ranged between 2.8210 and 3.2862 whereas the same was between 2.0099 and 3.1033 for CWWR for these four species. The relationship for the above two parameters were also established with regression coefficient of corelation and the 99% confident interval using ANOVA (MS Excel version 2016). The relationship of the studied two parameters namely carapace CLW and CWW were found to be significant between all the selected species at 1% level (P > 0.01). The Relative Condition factor (Kn) showed wide variations among these four species between CLWR and CWWR. This study presents the first reference on CLWR and CWWR for these species from the Gulf of Mannar. In addition, it also reports CLWR and CWWR for P. gladiator for the first time and for C. natator for which only limited information is available.
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