Impact of increase in temperature and light intensity on development and metamorphosis of hatchery reared silver pompano Trachinotus blochii (Lacepede, 1801) larvae

Jayakumar, R and Sakthivel, M and Nazar, A K A and Tamilmani, G and Ramesh Kumar, P and Samal, A K and Anikuttan, K K and Anbarasu, M and Balamurugan, V and Thiagu, R and Sirajudeen, S and Gopakumar, G (2018) Impact of increase in temperature and light intensity on development and metamorphosis of hatchery reared silver pompano Trachinotus blochii (Lacepede, 1801) larvae. Indian Journal of Fisheries, 65 (2). pp. 133-137.

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    Abstract

    The largehead ribbonfish, Trichiurus lepturus Linnaeus, 1758 forms a major fishery along north-west coast of India comprising the two coastal states of Gujarat and Maharashtra. Diet composition was analysed for five years (2010-2014) to understand shifts if any in the prey items. Seasonal changes in the prey items were studied for three years (2012-2014) to explore the temporal dynamics of prey availability in the ecosystem and in largehead ribbonfish guts. Feeding indices viz., Stomach fullness index (SFI), empty stomach ratio (ESR), gastrosomatic index (GaSI) and relative gut length (RLG) explained the feeding behaviour, seasonal dynamics and ontogenetic shifts in prey items. The Vacuity Index (VI) was estimated as 37.56%, indicating that T. lepturus is a carnivore and relatively edacious. Diet of T. lepturus comprised of fishes (47.16%), crustaceans (45.22%), molluscs (4.33%) and miscellaneous items (3.28%). Acetes sp. was the most dominant prey item during the study period. Feeding intensity was found to be high during the post-monsoon months which coincided with the period of gonadal maturation of the fish. Significant variations (p<0.05) were seen in the feeding indices during different months, different sizes and between sexes due to the availability of prey items, physiological changes and ontogenetic shifts. A detailed knowledge on diet composition, temporal dynamics in diet patterns and feeding indices can reveal the trophic interaction of prey-predator, resource abundance and fluctuations which are important inputs in ecology-based fishery management models/tools.

    Item Type: Article
    Uncontrolled Keywords: Larval growth, Light intensity, Metamorphosis, Silver pompano, Temperature
    Subjects: Aquaculture
    Aquaculture > Hatchery
    Eggs and Larvae
    Divisions: CMFRI-Mandapam
    Depositing User: Arun Surendran
    Date Deposited: 03 Jul 2018 11:00
    Last Modified: 03 Jul 2018 11:00
    URI: http://eprints.cmfri.org.in/id/eprint/12927

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