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  •   SEAFDEC Institutional Repository (SIR)
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  • 02 Technical Publications and Reports on Aquaculture
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  • ADSEA '94
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  •   SEAFDEC Institutional Repository (SIR)
  • 01 SEAFDEC Publications
  • 02 Technical Publications and Reports on Aquaculture
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  • ADSEA '94
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Research on marine and freshwater fishes

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adsea94p167-186.pdf (145.0Kb)
Date
1995
Author
Emata, Arnil C.
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Abstract
Most of the fish research at SEAFDEC AQD in 1992-1994 was on milkfish. Studies were conducted on year-round spawning through hormonal or environmental manipulation; optimum lipid and protein levels and ration size for captive broodstock; and the influence of spawner age on reproductive performance. The economics of hatchery operations, alone or integrated with broodstock as a commercial enterprise, was assessed. Mass production of larvae was refined with the use of commercial or SEAFDEC-formulated larval diets. Alternative rearing schemes in large tanks and ponds were tried. Hatcheryproduced and wild-caught larvae were compared in terms of growth and production in experimental nursery and grow-out ponds. Supplemental diets for brackishwater grow-out culture were formulated.

Studies on broodstock management of grouper Epinephelus spp. included lipid enrichment of the diet and hormonal induction of sex inversion. Seed production techniques were developed but survival rates were low. Grouper culture was found economically feasible in experimental ponds with 'trash' fish as feed.

The mangrove red snapper Lutjanus argentimaculatus was successfully induced to spawn with injection of human chorionic gonadotropin. Initial larval rearing trials were successful but survival rates must be improved.

Hormonal manipulation of spawning of the Asian sea bass Lates calcarifer allows seed production during most of the year. Photoperiod manipulation leads to maturation of females, but not males, beyond the natural breeding season (April-November). Nursery rearing of 9 mm juveniles is feasible in floating net cages with night lights that attract food zooplankton. The requirements of sea bass for lipid, protein, carbohydrates, and essential amino acids were determined.

In the rabbitfish Siganus guttatus, weekly injections of luteinizing hormone releasing hormone analogue (LHRHa) sustains milt production for three weeks. Thyroid hormones injected into broodstocks improved the growth of larvae to day 7.

Induced spawning techniques for the Asian catfish Clarias macrocephalus were refined by determining the seasonal responsiveness to LHRHa and pimozide injections and testing for pheromonal induction of spontaneous spawning. The optimum insemination rate was determined and egg hatchability was enhanced by removal of the adhesive coat before incubation. Several practical diets for catfish during grow-out culture were tested against 'trash' fish.

The broodstock management for bighead carp Aristichthys nobilis was studied. Cage-reared juveniles from cage-reared broodstock showed the best growth. To improve the reproductive performance, the broodstock diets were supplemented with vitamins A, C, and E.

Research on tilapias focused on genetics and strain selection. Several strain testing procedures for Nile tilapia were evaluated in their efficiency to detect economically important strain differences. Reference lines were developed from two existing red tilapia strains to measure and reduce the effects of uncontrolled nongenetic variables in strain evaluation experiments with Nile tilapia. The tolerance of two Nile tilapia strains to heavy metals was similar when gauged by the 24-hour and 96-hour lethal concentration and by fish growth, survival, and reproductive performance. In a separate study, four strains of red tilapia showed generally higher seed production when reared in tanks than in cages. Improvements in the feed and feeding management for Nile tilapia were also studied.

Intensive tilapia farming and feeding have led to oxygen depletion and fish kills in Sampaloc Lake. To rehabilitate the lake, it is imperative to reduce the farming area from 30 to 6 hectares; stop the use of commercial feeds; and remove the water hyacinths and other debris. Fish kills in Laguna de Bay have also become serious in recent years, and a review of the occurrences, losses, and possible causes is currently being conducted. Studies on the epizootic ulcerative syndrome of snakeheads in Laguna de Bay have yet to pinpoint the pathogen. Skin lesions in tilapias in several ponds and lakes in the country were found to be due to bacteria.
URI
http://hdl.handle.net/10862/43
Suggested Citation
Emata, A. C. (1995). Research on marine and freshwater fishes, pp. 167-186. In: Bagarinao TU, Flores EEC (eds) Towards Sustainable Aquaculture in Southeast Asia and Japan. Aquaculture Department, Southeast Asian Fisheries Development Center, Iloilo, Philippines.
Subject
water quality ASFA; environmental factors ASFA; hormones ASFA; ponds ASFA; hybridization ASFA; feed composition ASFA; marine fish ASFA; ecology ASFA; genetics ASFA; lakes ASFA; research ASFA; brackishwater fishes ASFA; breeding stock ASFA; fish culture ASFA; diet ASFA; animal nutrition ASFA; growth rate ASFA; seed (aquaculture) ASFA; feeds ASFA; pond culture ASFA; seed production ASFA; biological differences; aquaculture economics ASFA; fish diseases ASFA; hybrid culture; cage culture ASFA; disease prophylaxis ASFA; feeding experiments ASFA; gonads ASFA; mariculture; reproduction ASFA; freshwater aquaculture ASFA; Pisces AGROVOC; Dicentrarchus labrax AGROVOC; Clarias macrocephalus AGROVOC; Chanos chanos AGROVOC; Epinephelus AGROVOC; Lutjanus argentimaculatus AGROVOC; Siganus guttatus AGROVOC; Lates calcarifer AGROVOC; Epinephelus coioides AGROVOC; growth control AGROVOC; Oreochromis niloticus AGROVOC; Giant perch; Golden rabbitfish; Mangrove jack; milkfish AGROVOC; Philippines AGROVOC; South East Asia AGROVOC; Philippines, Luzon I., Zambales, Sampaloc L.; Philippines, Luzon I., Laguna de Bay
Taxonomic term
Chanos chanos GBIF; Hypophthalmichthys nobilis GBIF; Dicentrarchus labrax GBIF; Clarias macrocephalus GBIF; Epinephelus GBIF; Aristichthys nobilis GBIF; Epinephelus suillus GBIF; Lutjanus argentimaculatus GBIF; Siganus guttatus GBIF; Lates calcarifer GBIF; Epinephelus coioides GBIF; Oreochromis niloticus GBIF
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  • ADSEA '94 [21]

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