Purushottama, G B and Thakurdas, and Ramasubramanian, V and Dash, Gyanaranjan and Akhilesh, K V and Ramkumar, S and Kizhakudan, Shoba Joe and Singh, V V and Zacharia, P U (2017) Reproductive biology and diet of the grey sharpnose shark Rhizoprionodon oligolinx Springer, 1964 (Chondrichthyes: Carcharhinidae) from the north-eastern Arabian Sea. Indian Journal of Fisheries, 64 (4). pp. 9-20.
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Abstract
Information on reproductive biology is presented for the grey sharpnose shark Rhizoprionodon oligolinx Springer, 1964 (Chondrichthyes: Carcharhiniformes), collected off the north-west coast of India in the Arabian Sea. A total of 711 individuals, of 27.0 to 93.0 cm total length (TL), 180 to 2600 g total weight (TW) were used for the study. The length-weight relationships were significantly different between the sexes. The size-at-maturity (Lm50) for females and males was estimated to be 62.3 and 59.5 cm TL respectively. Number of embryos ranged from 1 to 7 and the size at birth was estimated between 25 to 30 cm TL. Overall sex ratio favoured the females slightly at the rate of 1.27:1. There was significant positive correlation between maternal TL and number of embryos (p<0.001). Dietary analysis of stomach contents (%IRI) revealed that R. oligolinx feeds primarily on teleosts (95.5%), cephalopods (3.2%) and crustaceans (1.2%). This study presents the first detailed biological observation on size, sex composition, size-at-maturity (Lm50) and length-weight relationship of R. oligolinx from the northern Arabian Sea.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Arabian Sea, Carcharhinidae, Diet, Embryo, Length-weight relationship, Reproductive biology, Size and sex compositions |
| Subjects: | Demersal Fisheries > Shark fisheries Fishery Biology |
| Divisions: | CMFRI-Mumbai CMFRI-Kochi > Marine Capture > Demersal Fisheries Division Subject Area > CMFRI > CMFRI-Kochi > Marine Capture > Demersal Fisheries Division CMFRI-Kochi > Marine Capture > Demersal Fisheries Division Subject Area > CMFRI-Kochi > Marine Capture > Demersal Fisheries Division |
| Depositing User: | Arun Surendran |
| Date Deposited: | 04 Jan 2018 09:03 |
| Last Modified: | 09 Jan 2018 13:19 |
| URI: | http://eprints.cmfri.org.in/id/eprint/12456 |
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