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Food consumption of the three-spined stickleback (Gasterosteus aculeatus L.)

Marjut Rajasilta
Annales Zoologici Fennici
Vol. 17, No. 2 (1980), pp. 123-126
Stable URL: http://www.jstor.org/stable/23733737
Page Count: 4
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Food consumption of the three-spined stickleback (Gasterosteus aculeatus L.)
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Abstract

The daily food consumption of the three-spined stickleback at different temperatures was calculated from determinations of the rate of digestion. The rate of digestion in fish which had taken food in the sea before being caught was compared with that of fish fed in the laboratory either with Daphnia or with plankton collected from the sea. Owing to seasonal differences in the food available in nature, determination of the digestion rate in fish that had taken food under natural conditions was found to give a better estimate of the actual food consumption of the three-spined stickleback than feeding experiments. In fish averaging 1.0 g fr.wt. the daily food consumption so calculated was 24.2±7.8 mg (2.4 % of the body fr.wt.) at 10 °C, 48,3±16.3 mg (4.8 %) at 14 °C, and 132.8±28.8 mg (13.3 %) at 18 °C. In fish averaging 1.6 g the respective rates were 100.2±39.7 mg (6.2 %), 186.2±50.4 mg (11.6 %) and 271.2±50.4 mg (16.9 %).

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