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Development and detection of phosphorus deficiency in Atlantic salmon, Salmo salar L., parr and post-smolts

1998; Wiley; Volume: 4; Issue: 1 Linguagem: Inglês

10.1046/j.1365-2095.1998.00095.x

1365-2095

Baeverfjord, Åsgård, Shearer,

Fish Ecology and Management Studies

Aquaculture NutritionVolume 4, Issue 1 p. 1-11 Development and detection of phosphorus deficiency in Atlantic salmon, Salmo salar L., parr and post-smolts Baeverfjord, Baeverfjord Institute of Aquaculture Research (AKVAFORSK), Sunndalsøra, NorwaySearch for more papers by this author Åsgård, Åsgård Institute of Aquaculture Research (AKVAFORSK), Sunndalsøra, NorwaySearch for more papers by this author Shearer, Shearer Northwest Fisheries Science Center, Seattle, WA, USASearch for more papers by this author Baeverfjord, Baeverfjord Institute of Aquaculture Research (AKVAFORSK), Sunndalsøra, NorwaySearch for more papers by this author Åsgård, Åsgård Institute of Aquaculture Research (AKVAFORSK), Sunndalsøra, NorwaySearch for more papers by this author Shearer, Shearer Northwest Fisheries Science Center, Seattle, WA, USASearch for more papers by this author First published: 04 January 2002 https://doi.org/10.1046/j.1365-2095.1998.00095.xCitations: 147 Dr GreteBaeverfjord Institute of Aquaculture Research (AKVAFORSK), N-6601 Sunndalsøra, Norway (e-mail: [email protected]) AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Abstract A pathological condition was induced in Atlantic salmon, Salmo salar L., by feeding a diet severely deficient in phosphorus. Parallel results were obtained in two consecutive experiments, one in fresh water and one in sea water. The deficiency condition was first manifest as a reduction in whole-body calcium (Ca) and phosphorus (P) levels and the development of abnormally soft and malformed bones. In later stages, growth was severely impaired and there was elevated mortality compared with fish fed a diet with sufficient phosphorus. Two semipurified casein-based test diets were used in the experiments. The low-P diet contained only the P from casein, 3.5 g kg−1 or 0.35%, whereas the reference diet was supplemented with P and contained 9.0 g kg−1 or 0.9%, The diets were fed to salmon parr in fresh water (initial weight 4.7 g) and to post-smolts in sea water (initial weight 113 g) for 12 and 15 weeks, respectively. In both experiments, the fish grew adequately for a prolonged period, whereas the whole-body Ca and P levels declined almost immediately. Within a few weeks, the whole-body P content was reduced to ≊ 65% of the initial value, and Ca to 40%. The reductions in mineral content were most severe in the mineral-rich tissues, bones and scales. On gross examination, all bony structures were abnormally soft. The ribs were wrinkly, and the spine displayed scoliotic changes. These changes were correlated to the reduction in bone mineralization, and were manifest at the time when reductions in growth rate could be noted. After the deficient fish were fed adequate levels of P for 9 weeks, their whole-body mineral levels returned to normal. The bone lesions did not heal completely during the same period of time. Citing Literature Volume4, Issue1March 1998Pages 1-11 RelatedInformation