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Mumi Kikuchi Miwa Suzuki Keiichi Ueda Hirokazu Miyahara Senzo Uchida 《Fisheries Science》2011,77(5):795-798
Entanglement in fishing gear occurs in endangered manatees and may result in serious injury or death. Such incidents may happen
more frequently at night when the animal’s visual sense is limited. In this study, we examined the differences in behavioral
response of captive manatees to a net obstacle during light (day) and dark (night) periods. We used a plastic net as the obstacle,
and video-recorded the manatees’ behavior. The experiments showed that captive manatees avoided the obstacle during the day
more frequently than at night, which suggests that the manatees can perceive the obstacle more readily during light periods.
However, there was no difference in the frequency of bumping or actively touching the obstacle between light and dark periods.
The results suggest that the manatees can recognize the net obstacle even at night by purposely touching it, but they avoid
it less frequently, and that entanglement during light periods may occur during accidental bumping, rather than from a failure
to recognize it altogether. 相似文献