The pathogenicity of bacteria associated with transport-stressed Chanos chanos fingerlings
Abstract
Two isolates of Aeromonas hydrophila biovar hydrophila and two isolates of Pseudomonas-like bacteria cultured from milkfish, Chanos chanos, fingerlings stocked in Laguna Lake(Philippines) pens after transport were tested for virulence against healthy milkfish fingerlings. Various combination of bacterial and different routes of inoculation (intraperitoneal injection, bath treatment of scaled fish and bath treatment of unscaled fish) were tested. Results show that bacterial entry in the pathogenesis of the test bacteria to challenged fish is more effective in fishes with scales removed than in uninjured fish or though intraperitoneal injection. The minimum lethal dose of A. hydrophila to scaled fish appeared less than 105 cells/ml of water medium. For Pseudomons-like isolates, the minimum lethal dose was at the level 105 cells/ml of water medium. Fish mortalities significantly increased on day 2 in all bacteria but A. hydrophila was significantly more virulent than the Pseudomonas-like inocula. When A. hydrophilawas injected intraperitoneally into undamaged fish, the maximum dose of 107cells per 2-g fish was needed to cause significant moralities. In general, virulence of the isolates was directly proportional to dose as well as to the length of exposure. A cute signs of bacterial infected scaled milkfish. Lethargic fish displayed spastic and unbalanced swimming movement before death. The virulence of the bacteria as evaluated in this study should lead to further investigation on the role of extracellular factors in bacterial pathogenesis to milkfish fingerling.
Suggested Citation
Lio-Po, G., & Duremdez-Fernandez, R. (1986). The pathogenicity of bacteria associated with transport-stressed Chanos chanos fingerlings. In J. L. Maclean, L. B. Dizon, & L. V. Hosillos (Eds.), The First Asian Fisheries Forum. Proceedings of the First Asian Fisheries Forum, 26-31 May 1986, Manila, Philippines (pp. 223-226). Manila, Philippines: Asian Fisheries Society.
Subject
Collections
Related items
Showing items related by title, author, creator and subject.
-
Milkfish nutrition: a review
Benitez, Lita V. (Philippine Council for Aquatic and Marine Research and Development, 1989)This paper reviews recent work on milkfish nutrition. Substantial progress had been made towards understanding the digestive physiology of milkfish. Major enzaymes envolved in the digestions of carbohydrates, protein and ... -
Lactate dehydrogenase isozyme patterns during the development of milkfish, (Chanos chanos (Forskal))
Requintina, Pura D.; Engle, L. M.; Benitez, Lita V. (University of the Philippines at Los Baños, 1981)Polyacrylamide disc gel electrophoresis was done to determine the lactate dehydrogenase (LDH) isozyme patterns for fry (5-3 mg), fingerling (6-12 g), pond-size (150-250 g) and adult (6-9 kg) milkfish. The patterns were ... -
Digestibility and effective level of meat and bone meal in formulated diet for milkfish, Chanos chanos Forsskal, grown in fresh and seawater
Catacutan, Mae R.; Pagador, Gregoria; Maceren-Pates, Mercedes D. (Masyarakat Akuakultur Indonesia (MAI), 2015)The efficient level of MBM for good growth and survival of milkfish, Chanos chanos Forsskal, without histological changes in tissues (liver, intestine, muscle, kidney and brain) was determined in both freshwater (FW) and ...