Abstract
Swimming movements of silver carp Hypophthalmichthys molitrix and bighead Aristichthys nobilis were measured by means of telemetric method in summer when the water temperature was high in Lake Donghu, Wuhan, China. The positions and speeds of the fish were calculated by the differences of the travelling times of sonic pulses from the acoustic tag to three points in water. The swimming of silver carp was lower in mean speed and shorter in maximum sustained time than that of the bighead. The silver carp swam in the layer close to the surface about 16 h and the bighead surfaced only about 4.5 h in a day. The mean swimming speeds of silver and bighead carps in summer were about 10 and 29 cm/s respectively. Swimming of silver carp in summer was slower than in autumn. Swimming area of the fishes was wider in summer than in autumn.
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