The swimming speed of seven large juvenile lemon sharks Negaprion brevirostris following attachment of an external speed‐sensing ultrasonic transmitter was significantly higher during the first 18 h after release compared to the average swimming speed obtained >48 h after release. The external speed‐sensing transmitter can be used to monitor the voluntary swimming speed of large fishes in the field, but data during the first 24 h period should be excluded from analysis of natural speeds, at least from species similar in behaviour to N. brevirostris .
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Sundström et al. (2002) studied this question.
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