Size and weight relationships of the purpleback flying squid, Sthenoteuthis oualaniensis (Cephalopoda: Ommastrephidae), from Arabian Sea

Ragesh, N and Sajikumar, K K and Sasikumar, Geetha and Ambrose, T V and Mohamed, K S (2023) Size and weight relationships of the purpleback flying squid, Sthenoteuthis oualaniensis (Cephalopoda: Ommastrephidae), from Arabian Sea. Journal of the Marine Biological Association of India, 65 (2). pp. 68-74. ISSN 2321-7898

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Abstract

The size and weight relationships and morphometrics of 390 individuals of the purpleback flying squid, Sthenoteuthis oualaniensis, collected from the tropical Arabian Sea were studied. The lengthweight relationship was W = 0. 0320 DML3.0972 for females, W = 0.0318 DML3.1288 for males, and W = 0.0382 DML3.0395 when sexes were combined indicating an isometric growth pattern. Most of the morphometric characters showed a high degree of correlation among the compared characters. The relationships between ten morphometric characters against the dorsal mantle length of both the sexes were analysed and it indicated a very high degree of correlation in females compared to males. Females in the samples were twice the size of males, indicating sexual dimorphism in body size

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