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    Sea bass, groupers and snappers

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    adsea91p003-012.pdf (91.46Kb) Open Access
    Downloads: 5,246
    Date
    1994
    Author
    Duray, Marietta N.
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    2,966
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    Abstract
    Studies on sea bass (Lates calcarifer) broodstock were directed at techniques to maximize egg production. Now known are the: optimum luteinizing hormone releasing hormone analogue (LHRHa) dose range to induce spawning, optimum egg size responsive to LHRHa induction, appropriate time for induction, proper storage conditions for LHRHa, and induction of spermiation in males. Gonadal maturation and spawning are successfully induced by LHRHa and/or 17 alphamethyltestosterone. An experiment on photoperiodic induction of sexual maturation is being conducted to produce seed year round. Increased information on larval morphology and physiology of sea bass led to improvements in feeding strategies and transport techniques. Studies on nutrient requirements and practical diets are currently being undertaken for different stages/sizes of sea bass. An economic assessment found an integrated sea bass production system viable.

    Studies on groupers (Epinephelus spp.) have been geared towards broodstock development including induction of sex inversion by hormonal control, intraspecific interaction, and sex control using synthetic anabolic steroids. Spontaneous maturation and successive spawnings of captive Epinephelus suillus were achieved in 1990. Larval rearing techniques used for other marine fish species were tried but with limited success. Culture techniques in ponds and floating cages using SEAFDEC-formulated diets or commercial pellets are being developed.

    Studies on snappers (Lutjanus spp.) have been started with the identification of species common in Panay Island.
    URI
    http://hdl.handle.net/10862/36
    Suggested Citation
    Duray, M. N. (1994). Sea bass, groupers and snappers. In F. Lacanilao, R. M. Coloso, & G. F. Quinitio (Eds.), Proceedings of the Seminar-Workshop on Aquaculture Development in Southeast Asia and Prospects for Seafarming and Searanching; 19-23 August 1991; Iloilo City, Philippines. (pp. 3-12). Tigbauan, Iloilo, Philippines: Aquaculture Department, Southeast Asian Fisheries Development Center.
    Type
    Conference paper
    ISBN
    971851127X
    Subject
    Sex reversal; Pond culture; Induced breeding; Sperm; Seed production; Spawning; Fish larvae; Light effects; Sex hormones; Transportation; Fecundity; Nutritional requirements; Sexual maturity; Cage culture; Brood stocks; Steroids; Epinephelus; Lates calcarifer; Lutjanus; Philippines
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    • ADSEA '91 [21]


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