Reproductive biology and diet of the grey sharpnose shark Rhizoprionodon oligolinx Springer, 1964 (Chondrichthyes: Carcharhinidae) from the north-eastern Arabian Sea

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.

[img]
Preview
Text
IJF_64.4_G B Purushottama_Reproductive biology and diet of grey sharpnose shark.pdf

Download (674kB) | Preview
Related URLs:

    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
    Subject Area > CMFRI > CMFRI-Kochi > Marine Capture > Demersal Fisheries
    CMFRI-Kochi > Marine Capture > Demersal Fisheries
    Subject Area > CMFRI-Kochi > Marine Capture > Demersal Fisheries
    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

    Actions (login required)

    View Item View Item