Environmental implications of nutrition and metabolism of salmonids

• Published in: Proceedings of the British Society of Animal Production (1972)
• Main Authors: Carter, C.G., Houlihan, D.F., McCarthy, I.D., Mitchell, A.I., Buchanan, B.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Cambridge University Press (CUP) 1992
• Subjects: General Medicine; Atlantic salmon; Salmo salar
• Online Access: http://dx.doi.org/10.1017/s0308229600021929; https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0308229600021929

In farmed salmonids the majority of consumed nitrogen is lost in metabolic waste products (mainly ammonia) and the faeces (Table 1). Any improvement in nitrogen retention, brought about by reductions in these components, would decrease environmental load. Inter-individual variation in retained nitrogen has been little investigated as a basis for selection of more efficient fish; this communication points to an experimental approach to measuring individual variation by concentrating on digestive efficiency and protein turnover as possible contributors to nitrogen retention. The utilization of dietary nitrogen was investigated in two species of farmed salmonid, the rainbow trout, Oncorhynchus mykiss and the Atlantic salmon, Salmo salar.