Reproductive adaptation: a description of claspers of the Spadenose shark and Milk shark from Gujarat

Dash, Swatipriyanka Sen and Kizhakudan, Shoba Joe and Zacharia, P U and Dash, Gyanaranjan (2020) Reproductive adaptation: a description of claspers of the Spadenose shark and Milk shark from Gujarat. Indian Journal of Geo-Marine Sciences, 49 (7). pp. 1238-1241.

[img]
Preview
Text
Indian Journal of Geo-Marine Sciences_2020_Swatipriyankasen Dash_Shark.pdf

Download (238kB) | Preview
Official URL: http://nopr.niscair.res.in/handle/123456789/55093
Related URLs:

    Abstract

    To ensure reproductive success, sharks have adapted several strategies. It was observed that male sharks of Scoliodon laticaudus Müller & Henle, 1838 and Rhizoprionodon acutus (Rüppell, 1837) landed along a few centres of Gujarat coast, have highly calcified claspers which morphologically resembled ossified webbed foot. The morphological and anatomical study revealed that the terminal end of the clasper has been modified into an umbrella like organ called rhipidion which probably ensures that the clasper stays within the cloaca of the female until the sperm is delivered. The landed sharks were all mature. This recent observation of catch of many mature individuals near the coastal waters throws some light on the breeding season and breeding area of sharks along Gujarat coast. With episodes of extinction and threat to the existence of several species of sharks today, this reproductive adaptation of the sharks might helps them to survive and sustain adverse conditions.

    Item Type: Article
    Uncontrolled Keywords: Breeding season, Male reproductive organ, Maturity, Rhipidion
    Subjects: Demersal Fisheries > Shark fisheries
    Fish and Fisheries > Fish biology
    Demersal Fisheries
    Divisions: CMFRI-Madras (Chennai)
    CMFRI-Digha
    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: 01 Dec 2020 04:59
    Last Modified: 01 Dec 2020 04:59
    URI: http://eprints.cmfri.org.in/id/eprint/14718

    Actions (login required)

    View Item View Item