Abstract
The growth rate of brown trout (Salmo trutta L.) is affected by many factors including the size and metabolic requirements of the fish, the water temperature, and the amount of food eaten by the fish. As a result of previous work on feeding and growth, it is now possible to estimate the maximum weight of food eaten in a day and the maximum growth rate of trout in the weight range 5-300 g at both constant and fluctuating temperatures in the range 3.8-19.5? C (Elliott 1975a, b). The chief purpose of the present paper is to investigate the relationship between the growth rate of brown trout and the amount of food eaten in a day. A mathematical model is developed to estimate the daily ration required for different levels of growth ranging from zero to maximum growth rate.
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