First report on the diet and reproductive biology of red-toothed triggerfish Odonus niger (Ruppell, 1836) from the south-eastern Arabian Sea

Suyani, N K and Rajesh, Mridula and Rajesh, K M (2021) First report on the diet and reproductive biology of red-toothed triggerfish Odonus niger (Ruppell, 1836) from the south-eastern Arabian Sea. Journal of the Marine Biological Association of the United Kingdom, 101 (5). pp. 827-837.

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    Abstract

    The feeding habits and reproductive biology of red-toothed triggerfish Odonus niger (Ruppell, 1836) was analysed from 449 specimens collected from the Karnataka coast of the south-eastern Arabian Sea. Of the total stomachs examined, only 54 (12%) were empty and 395 contained food remains. The diet comprised crustacean remains (48.0%), zooplankton (21.4%), algae (16.5%), fish remains (6.1%) and cephalopod remains (5.3%) along with partially digested matter (2.3%) and detritus (0.4%). The species was found to be a generalist feeder and an omnivore. The overall sex ratio between males and females (1: 0.44) was significantly (P < 0.05) different. Histological examination of the ovaries indicated asynchronous ovarian development in females, with males maturing earlier than females. The gonadosomatic index (GSI) patterns of males and females, and the presence of ripe ovaries and spermatozoids suggested that April–May is the peak spawning period. The absolute and relative fecundity estimates ranged from 16,464–312,420 eggs and 251–2812 eggs g−1 respectively. Fecundity was positively correlated with total length and body weight. The biological information on diet composition and reproductive traits provided for the first time in this study can facilitate conservation, management and sustainable exploitation of this species in the study area.

    Item Type: Article
    Uncontrolled Keywords: Balistidae; histology; Odonus niger; triggerfish; vacuity index
    Subjects: Fish and Fisheries > Fish breeding
    Fishery biology
    Food and Feeding
    Pelagic Fisheries
    Pelagic Fisheries > Pelagic Fishes
    Divisions: CMFRI-Mangalore
    CMFRI-Kochi > Marine Capture > Pelagic Fisheries
    Subject Area > CMFRI > CMFRI-Kochi > Marine Capture > Pelagic Fisheries
    CMFRI-Kochi > Marine Capture > Pelagic Fisheries
    Subject Area > CMFRI-Kochi > Marine Capture > Pelagic Fisheries
    Depositing User: Arun Surendran
    Date Deposited: 15 Dec 2021 09:02
    Last Modified: 15 Dec 2021 09:02
    URI: http://eprints.cmfri.org.in/id/eprint/15591

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