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Effects of three commercial diets on growth, cataract development and histopathology of lumpfish ( Cyclopterus lumpus L.)
Author(s) -
Imsland Albert K D,
Reynolds Patrick,
Jonassen Thor Magne,
Hangstad Thor Arne,
Elvegård Tor Anders,
Urskog Tonje Cecilie,
Mikalsen Bjørn
Publication year - 2018
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/are.13776
Subject(s) - vacuolization , biology , hindgut , histopathology , fish <actinopterygii> , zoology , midgut , endocrinology , fishery , pathology , ecology , larva , medicine
Three duplicate groups of individually tagged lumpfish (mean initial weight: 20.0 ± 4.0 g) were fed three commercially available diets (A, B and C) for a period of 147 days. There were significant differences in growth rates between the groups with fish fed diet A having the highest growth rates whilst fish fed diet C achieved the lowest growth. Lumpfish fed diets A and B had lower prevalence and severity of cataracts compared with fish fed diet C, suggesting a possible dietary effect on cataract, alone or in combination with other environmental factors. There was a significant difference in the degree of liver vacuolization between the three dietary treatments at the end of the study period with fish fed diets A and B showing moderate to severe vacuolization compared with liver tissue from fish fed diet C, which had milder vacuolizations. There was little or no inflammation in pyloric caeca, midgut and hindgut and similarly for epithelial necrosis or vacuolization for all three dietary treatments at the end of the study. Fish fed diet A had the longest intestinal folds whilst fish fed diet C had the shortest.