Influence of body size and food ration on the energy budget of rainbow trout Salmo gairdneri Richardson

摘要: Three size classes (3 g, 200 1–3 kg) of rainbow trout, Salmo gairdneri Richardson, were each fed five rations ranging from zero to a ‘maximum’ ration and the relationships among body size, food ration, metabolism growth examined. Water temperature was constant at 11–4°C. The gross efficiency in wet weight, K, increased asymptotically with increasing but decreased size. Changes fat moisture content body, however, such that Kin terms energy utilization independent when fish feeding same level. This result not apparent weight values only considered use convert offish calorific can lead errors interpretation results. Assimilation averaged 71 -7 % over all groups ration. Total metabolic expenditure, level, any given level similar proportion assimilated used for metabolism. At single therefore, percentage category budget remained sizes. Such be expected under laboratory conditions it provides base-line comparison performance other more complicated systems.