Abstract
Abstract The long-term study of brown trout in Black Brows Beck was introduced in Chapter 3. Emphasis was placed on the chief factors affecting population density and survival for different life stages and year-classes. A similar approach is now applied to the growth, size and production of the trout. This chapter begins by considering the length-weight relationships for different life stages of trout. Growth is then examined in relation to population density, water temperature, fish size, and level of energy intake. It has already been shown in Chapter 4 that the three latter factors are the most important variables affecting the growth and energetics of brown trout. One of the growth models [eqn (4.4)] described in Chapter 4 is shown to be an effective model for the trout population in Black Brows Beck. Without such a model, interpretation of the changes in growth would have been impossible.
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