Egg quality of grouper Epinephelus coioides fed different fatty acid sources
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Quality of eggs spawned by Epinephelus coioides fed fish by catch (control). Cod liver oil-enriched fish by catch (TFC), and commercial HUFA A-enriched fish by catch (TFS) was monitored. Monthly egg production, spawning frequency, fertilization rate, egg viability, and hatching rates of the control were significantly higher compared to TFS Egg production. Spawning frequency and hatching rate of TC and TFS were not significantly different. Results suggest that varying the species of fish by catch could provide the requirements of E. Coioides broodstock so as to provide quality eggs.
In: MacKinlay, D., Eldridge, M. (eds.). The Fish Egg: Its Biology and Culture Symposium Proceedings. International Congress on the Biology of Fishes, 14-18 July 1996, San Francisco State University. Bethesda, Maryland: American Fisheries Society, Physiology Section. pp. 103-107
PublisherAmerican Fisheries Society, Physiology Section
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Viral nervous necrosis (VNN) as a critical infectious disease of orange-spotted grouper, Epinephelus coioides, in the Philippines I Kiryu, LD de la Peña, Y Yoshiura, M Ototake & Y Maeno - In K Nakamura (Ed.), Sustainable Production Systems of Aquatic Animals in Brackish Mangrove Areas, 2007 - Japan International Research Center for Agricultural SciencesOrange-spotted grouper, Epinephelus coioides, is a valuable commodity in the Philippines. In 2001, mass mortality occurred in the grouper larvae at Aquaculture Department, Southeast Asian Fisheries Development Center (SEAFDEC/AQD) and the disease was identified as viral nervous necrosis (VNN). Since then, the disease has been observed every year and the grouper hatcheries have been devastated. In this paper, recent studies of VNN which were conducted at the SEAFDEC/AQD from 2001 to 2006 are reviewed. 1) Susceptibility to the VNN virus was tested among fish species that were cultured in mangrove brackish are. Five representative cultured fish species including orange-spotted grouper, Asian sea bass (Lates calcarifer), mangrove red snapper (Lutjanus argentimaculatus), milkfish (Chanos chanos) and rabbitfish (Siganus guttatus) were used in the test where the virus was intraperitoneally injected into the juveniles. Although low or no mortality occurred in the challenge test, histopathological changes were observed in the brain and retina where the virus was re-isolated. The results were the same among the species except for rabbitfish which had no evidence for the infection. It was verified that the virus has a wide host range. 2) To estimate the possible risk of viral spread by vertical transmission, virus distribution was determined in asymptomatic groupers including 7 broodstock and 17 juveniles with body weights ranging from 4 to 12 kg and 2 to 9 respectively. The virus was detected by PCR method. The highest detection rate was in the brain, and the virus was also detectable in other organs such as the gills, heart, spleen, kidney, blood, esophagus, stomach, intestine, liver, gonad, swim bladder and/or skin. 3) As a possible VNN vaccine, a DNA p;asmid encoding the capsid protein of the virus was evaluated. After the challenge, the mortalities between the native and DNA-injected fish appeared significantly different (P<0.05).
Collection of the orange-spotted grouper Epinephelus coioides from Tinagong Dagat and Sapian Bay in northern Panay NB Solis - In T Bagarinao (Ed.), Research Output of the Fisheries Sector Program, 2007 - Bureau of Agricultural Research, Department of AgricultureIn Capiz, northern Panay, grouper catches by hand picking, hook and line, shelters, and fish corral were low throughout the year, on average 1-3 fish from each fishing operation, but higher in Tinagong Dagat than in Sapian Bay. Epinephelus coioides was the most common of the three grouper species collected; E. quoyanus and E. malabaricus were not numerous. The 882 specimens of E. coioides from Tinagong Dagat measured from 3.6 to 39 cm in standard length; the 250 E. coioides from Sapian Bay were between 1.7 and 31.2 cm SL. The size distribution showed a modal length of about 17 cm SL (21% of the fish) in Tinagong Dagat, and 11 cm (26%) in Sapian Bay. Small juveniles 2–8 cm were collected from Tinagong Dagat in January-April 1993, but not in Jan-Apr 1994. Such small juveniles were also collected from Sapian Bay in January and in April–August 1993. Groupers 9–23 cm occurred year round, but the 9–15 cm group was more abundant from January to June. At both sites, groupers >30 cm could hardly be found. Both grouper habitats experienced wide ranges of water temperature, salinity, and dissolved oxygen during the year.
Isolation, identification of causative agent of "red boil disease" in grouper (Epinephelus salmoides) and its possible control by vaccination SY Wong, B Ong & TE Chua - In Proceedings of the International Workshop on Pen Cage Culture of Fish, 11-22 February 1979, Tigbauan, Iloilo, Philippines, 1979 - Aquaculture Department, Southeast Asian Fisheries Development Center; International Development Research CentreThis report presents the initial results of studies on the isolation and identification of the causative agent as well as possible immunization of the estuary groupers. It is hoped that by a vaccination programme, fish could be made immune to such disease. Results indicate: (1) Vibrio parahaemolyticus is pathogenic to estuary grouper (2) that the vaccines did not seem to protect the fish against the vibrio when challenged one week after vaccination, but that this was due to slow antibody production of the fish as salmonids challenged about 30-35 days after vaccination reported good protection against Vibrio anguillarum and other bacterial diseases. Experiments are now in progress to challenge the vaccinated groupers at a later stage.