Reproductive biology and size at onset of sexual maturity of the spiny lobster Panulirus homarus homarus (Linnaeus, 1758) in Khadiyapatnam, southwest coast of India

Thankarajan, R and Radhakrishnan, E V (2017) Reproductive biology and size at onset of sexual maturity of the spiny lobster Panulirus homarus homarus (Linnaeus, 1758) in Khadiyapatnam, southwest coast of India. Journal of the Marine Biological Association of India, 59 (2). pp. 19-28.

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    Abstract

    The size at first sexual maturity is described for females of the Scalloped spiny lobster Panulirus homarus homarus (Palinuridae) sampled from landings at Khadiyapatnam in Kanyakumari district of Tamilnadu, on the southwest coast of India, based on physiological and functional maturity indices. The size at 50% physiological maturity was estimated at 55.0 mm carapace length (CL), based on regression of percent of females with mature, maturing and spent - recovery ovary against carapace length. The smallest female with a mature ovary was 45.5 mm CL compared to the smallest female (46.5 mm CL) with external eggs. Logistic relationships between CL and percentage of females with external eggs (berried) and with ovigerous setae on endopod of pleopods indicated that 50% maturity was attained at 61.0 mm CL (berry method) and 54.0 mm CL (setal method), respectively. Size at maturity based upon appearance of well developed pairs of ‘windows’ on the last pair of sternal plates at the base of fifth pereiopods was estimated at 55.0 mm CL. The analyses show that the external secondary sexual characters may be useful as morphological measures of functional sexual maturity in the spiny lobster Panulirus homarus homarus from Indian waters, as these values are very close to the size at physiological maturity (55.0 mm CL) obtained based on the ovarian maturation. On the basis of this study, a minimum legal size (MLS) of 65.0 mm CL for fishing P. homarus homarus from Indian waters is recommended.

    Item Type: Article
    Uncontrolled Keywords: size at maturity, secondary sexual characters, Panulirus homarus homarus, reproductive biology, spiny lobster.
    Subjects: Crustacean Fisheries > Lobsters
    Divisions: CMFRI-Kochi > Marine Capture > Crustacean Fisheries
    Subject Area > CMFRI > CMFRI-Kochi > Marine Capture > Crustacean Fisheries
    CMFRI-Kochi > Marine Capture > Crustacean Fisheries
    Subject Area > CMFRI-Kochi > Marine Capture > Crustacean Fisheries
    Depositing User: Arun Surendran
    Date Deposited: 29 May 2018 07:11
    Last Modified: 29 May 2018 07:11
    URI: http://eprints.cmfri.org.in/id/eprint/12808

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