Pests/parasites and diseases of milkfish in the Philippines
วันที่
1984Page views
13,186ASFA keyword
AGROVOC keyword
Taxonomic term
เมตาดาต้า
แสดงระเบียนรายการเต็มShare
นามธรรม
This paper presents all known parasites of milkfish (Chanos chanos ) in the Philippines. The major parasitic groups include acanthocephalans, copepods, isopods, and heterophyid flukes. The number of parasitic species found in ponds is small compared with those harbored by the fish in its natural environment. Parasites with a direct life cycle usually survive in ponds as flagellates, ciliates, myxosporidians, coccidia, and parasitic arthropods under improper management. The methods of treatment, prevention and control of these parasites are discussed.
การอ้างอิง
Velasquez, C. C. (1984). Pests/parasites and diseases of milkfish in the Philippines. In J. V. Juario, R. P. Ferraris, & L. V. Benitez (Eds.), Advances in milkfish biology and culture: Proceedings of the Second International Milkfish Aquaculture Conference, 4-8 October 1983, Iloilo City, Philippines. (pp. 155-159). Metro Manila, Philippines: Published by Island Pub. House in association with the Aquaculture Department, Southeast Asian Fisheries Development Center and the International Development Research Centre.
Type
Conference paperISBN
9711007045คอลเลกชัน
Related items
Showing items related by title, author, creator and subject.
-
Diseases of milkfish
(Aquaculture Department, Southeast Asian Fisheries Development Center; International Development Research Centre; Island Publishing House, Inc., 1984)Although the history of Chanos chanos culture has been quite long, reports of major epizootics have been few. Trained manpower and disease diagnostic services in most milkfish growing areas have not been readily available. Hence, earlier reports of etiologic agents of these epizootics were limited mostly to direct microscopic examination of specimens. Significant disease cases reported were attributed to bacterial, myotic, parasitic, and toxic causes. Bacterial infections, primarily due to Vibrio sp., have been frequently associated with mortality. To a lesser, extent fungal infections have also been reported. Intoxication of stock in freshwater systems by Microcystis toxins has caused massive fish kills in Laguna de Bay, Philippines. In most instances, affected fish were predisposed by environmental stress incurred in handling storage and transport. The fry and fingerling stages seemed severely affected compared with the older stages. Control of these infections must include assessment of fish husbandry practices first, before the use of chemotherapeutic agents like antibiotics is considered. -
Detection and identification of viral pathogens in marine finfish cultured in the Philippines
(Aquaculture Department, Southeast Asian Fisheries Development Center, 2005-03)This is a summary of investigations conducted on 91 disease/mortality cases observed among marine fish: groupers (Epinephelus coioides, E. malabaricus), sea bass (Lates calcarifer), rabbitfish (Siganus spp.), red snapper (Lutjanus argentimaculatus), milkfish (Chanos chanos) and tilapia (Oreochromis niloticus) from 2000 to 2003 at SEAFDEC/AQD and other sources in the Philippines. Eleven established cell lines were maintained namely: GF-1, SBK-2, SSN-1, E-11, BF-2, CFS, EPC, FHM, SHS, WSS2Cl, and WSSK. Among the 52 cases of grouper larvae, fingerlings, juveniles, and broodstocks sampled, viable viral nervous necrosis (VNN) virus was isolated in E-11 and GF-1 cells from 2/8 (25%), 15/26 (57.7%), 7/14 (50%) and 3/4 (75%) cases in 2000, 2001, 2002 and 2003, respectively. This comes to approximately 51.9% (27/52) being positive for viable VNN virus with a virus titer of TCID50 105.0-5.5. Among the 14 rabbitfish case samples examined, 1/5 and 2/3 of the 2000 and 2002 filtrates, respectively, as well as 5/11, 1/2, 3/10 and 1/2 case samples of diseased red snapper, sea bass, milkfish and tilapia samples, respectively, also yielded viable VNN. The isolations of the VNN virus from naturally-infected rabbitfish, red snapper, milkfish, and tilapia are first reports. Cytopathic effects induced by VNN were characterized by vacuolations followed by complete detachment of the inoculated cells after 3-7 days. The presence of vacuolations in the histological analyses of the brain and retina of naturally-infected fish, plus the positive results of RT-PCR tests (one-step and/or nested) for VNN of all viral isolates, further confirmed the identity of the nodavirus. One viral isolate from rabbitfish remains unidentified. These results indicate that VNN caused the mortalities of majority of cases of marine fish epizootics observed in 2000 to 2003 in the Philippines. -
Research activities and accomplishments of the SEAFDEC Aquaculture Department, 1988-1991
(Aquaculture Department, Southeast Asian Fisheries Development Center, 1993)Research studies conducted from 1988 to 1991 focused on breeding, seed production, and farming of thirteen aquaculture species of regional importance. Studies aimed at developing economical feeds, as well as disease prevention and control were undertaken. Guided by the recommendations of ADSEA I (Seminar-Workshop on Aquaculture Development in Southeast Asia; 8-12 Sept. 1987; Iloilo City, Philippines), workshops to review the previous years' progress and identify specific studies for implementation were held annually since 1989 with the participation of academic institutions, government and private sectors. Some 212 studies were implemented. Majority were on tiger shrimp, milkfish, and sea bass. Studies on other species of fishes, crustaceans, molluscs, and seaweeds, as well as larval food organisms, seafarming and economics of hatchery and grow-out culture systems were also undertaken. As of December 1991, 168 studies were completed. Research results were published in 204 scientific journals, proceedings, and other publications. In addition, 27 papers were in press and 63 manuscripts had been submitted. That research output is gaining recognition in the international scientific community can be gleaned from the number of papers published in refereed journals covered by Current Contents (CC). Of the 142 papers published in scientific journals in 1988-1991, 115 (81%) appeared in CCcovered journals. This has increased from 58.8% (124 of 211) in 1976-1987. The active participation of the research staff in scientific meetings is equally evident from the number of publications in proceedings of scientific meetings from 1988-1991 (63).
