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| 질의: fishes | 결과: 1306번째/13207 | |
Neophocaena phocaenoides, Finless porpoise
| 해상도: 400x320
파일크기: 23408 Bytes
등록시간: 2008:02:10 16:22:30
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CMS: Neophocaena phocaenoides, Finless porpoise
: Finless porpoises are generally found as singles,
pairs, or in groups of up to 12, although aggregations of up to
about 50 have been reported (Jefferson et al. 1993). Recent data
suggest, that the basic unit of a finless porpoise school is a mother/calf
pair or two adults, and that schools of three or more individuals
are aggregations of these units or of solitary individuals. Social
structure seems to be underdeveloped in the species, and the mother/calf
pair is probably the only stable social unit (Kasuya, 1999).
Reproduction
: Reproduction in most areas has not been well
studied. Reports indicate that calving in the Yangtze River occurs
between April to May whereas on the Pacific coast of Japan it occurs
between May and June and November - December in western Kyushu.
Animals form Kyushu live 25 years and attain sexual maturity at
4 - 9 years of age. Gestation lasts 11 months (Amano, 2002).
Photo © Institute of Hydrobiology, Chinese
Academy of Sciences (see CSI at "
links
")
Food
: Finless porpoises are reported to eat fish and shrimp
in the Yangtze River, and fish, shrimp and squid in the Yellow Sea/Bohai
area and off Pakistan. In Japanese waters they are known to eat
fish, shrimp, squid, cuttle fish and octopus. Finless porpoises
are opportunistic feeders utilising various kinds of available food
items available in their habitat. Seasonal changes in the diet have
not been studied (Kasuya, 1999). They also apparently ingest some
plant material, including leaves and rice (Jefferson et al. 1993).
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동물그림창고 똑똑전화 누리집
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