The activity rhythm of emerging grayling, Thymallus thymallus, fry was studied under semi‐natural rearing conditions, using special traps buried in the gravel. Emergence was mainly diurnal with a maximum in the first hours of daylight. Fry rested at the emergence site during the daylight and moved downstream at night, particularly during the first 3 hours of darkness. These results are compared with the known activity patterns of other salmonids.
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Bardonnet et al. (1990) studied this question.
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