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Swimming behaviour of the pinnotherid crab, Tritodynamia horvathi observed during the low temperature season

Published online by Cambridge University Press:  04 April 2001

Tohru Takahashi ,
Takuya Otani  and
Shuhei Matsuura
Tohru Takahashi
Affiliation:
Department of Fisheries, Kyushu University, Hakozaki, Fukuoka 812, Japan
Takuya Otani
Affiliation:
Nagasakiken Fisheries Company Ltd, Kosaza, Kitamatsuura, Nagasaki 857-04, Japan
Shuhei Matsuura
Affiliation:
Department of Fisheries, Kyushu University, Hakozaki, Fukuoka 812, Japan
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Abstract

The swimming and swarming behaviour of Tritodynamia horvathi (Brachyura: Pinnotheridae) has been considered to be a seasonal activity related to summer mating. However, little information has been available regarding other seasons of the year as the crabs have not been observed at the sea surface in the cool months from October until May. This is the first report of swimming behaviour observed during this low temperature season. The swimming individuals were observed in March 1991 in Yatsushiro Sound, Japan. Tritodynamia horvathi were observed swimming at a depth of 15 m, using their maxillipeds to feed. The crabs also swam in the aquarium and caught Artemia nauplii in the same manner. These findings suggest that their swimming behaviour is not a seasonal mating activity as previously believed, but a habitual behaviour associated with feeding.

Type
SHORT COMMUNICATION
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 79 , Issue 2 , April 1999 , pp. 375 - 377
Copyright
© 1999 Marine Biological Association of the United Kingdom

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