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The Growth Rate of Brown Trout (Salmo trutta L.) Fed on Maximum Rations

J. M. Elliott
Journal of Animal Ecology
Vol. 44, No. 3 (Oct., 1975), pp. 805-821
DOI: 10.2307/3720
Stable URL: http://www.jstor.org/stable/3720
Page Count: 17
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The Growth Rate of Brown Trout (Salmo trutta L.) Fed on Maximum Rations
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Abstract

(1) Brown trout (live weight 5-281 g) were fed to satiation at fifteen different water temperatures (range 3.8-21.7 degrees C). (2) Both the weight of the trout and the water temperature affected the mean specific rate of increase in weight (GW% day-1), and the relationship between the three variables was well described by an equation which can be used to estimate the value of GW for trout in the weight range 10-300 g at temperatures between 3.8 and 19.5 degrees C. (3) The growth rate decreased markedly as the weight of the trout increased, and increased with increasing temperature from 3.8 to 12.8 degrees C, was maximum between 12.8 and 13.6 degrees C, and decreased with increasing temperature from 13.6 to 19.5 degrees C. (4) A general equation for growth was developed, and was found to be a good equation for describing the growth of both wild and hatchery-reared trout feeding on a variety of food organisms in both the stream and the laboratory. This equation was applicable to trout in the weight range 5-300 g at both constant and fluctuating temperatures between 3.8 and 19.5 degrees C.

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