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- Title
Physiological characteristics of blue sac disease in chum salmon alevins.
- Authors
Ban, Masatoshi; Hida, Kazuhiro; Kuwaki, Motoyasu; Horanai, Tetsuo; Ohnuki, Tsutomu; Oseko, Norihisa
- Abstract
Blue sac disease (BSD) in salmonids results in the abnormal accumulation of ascites fluid and can often lead to mass mortality. However, the symptoms and causes of BSD remain poorly characterized. In the winters of 2015–2017, BSD was observed in chum salmon Oncorhynchus keta alevins at Hatchery-X in Hokkaido, Japan. We conducted histological observations of the visceral organs and analyzed nutrient concentrations [glucose (GC), triglyceride (TC), and protein (PC)] in liver, muscle, plasma, and ascites fluid. Several void spaces that appeared to leak body fluid in the liver were observed. Voids between Bowman's capsules and glomeruli were wider in the kidneys of diseased alevins than in normal alevins. Liver GC was significantly lower in diseased alevins than in normal alevins, and no differences were observed in muscle TC or PC. Plasma PC, plasma TC, and hematocrit were lower in diseased alevins than in normal alevins. No differences in the nutrient concentrations of plasma and ascites fluid were observed between diseased and normal alevins. BSD in chum salmon alevins might be due to impaired body fluid regulation and imbalances in the plasma component caused by lesions in the liver and kidneys.
- Subjects
HOKKAIDO (Japan); REGULATION of body fluids; BODY fluid disorders; SALMON; ONCORHYNCHUS
- Publication
Fisheries Science, 2023, Vol 89, Issue 1, p31
- ISSN
0919-9268
- Publication type
Article
- DOI
10.1007/s12562-022-01646-6