Stone loach and bullhead were given a choice of Chironomus and Asellus prey in experiments using solitary fish and fish in company . Solitary fish ate more than fish in company . The effect of light and substratum type on feeding was investigated . Both species ate more prey items on gravel than silt when a significant difference was observed . Bullhead ate more than loach in the light on both substrata. The only experiment in which loach ate more than bullhead was on a silt substratum in the dark . It is concluded that these two species utilise different components of the available food resources in chalk streams by adopting different habitats.
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