2011년 4월 4일 월요일

Magamouth shark & Irrawaddy dolphin






 Megamouth shark

Order - Lamniformes
Family - Megachasmidae
Genus - Megachasma
Species - pelagios
Megamouth first captured in 1976
It have some different names
Megamouth shark (English), grootbekhaai (Dutch), requin grande gueule (French), and tiburón bocudo (Spanish)

It usually found in Japan, Taiwan, Philiphines
megamouth lives epipelagicly (in the upper part of the water column) in open ocean.

Distinctive Features
Body stout, tapering posteriorly. Head bulbous, wide and long; snout very short and broadly rounded. Gill slits moderate long but not reaching dorsal surface of head. Mouth broad, terminal, corner extending behind eyes. Caudal peduncle without keels or ridges.
Size
The sizes of all reported megamouth sharks are listed in a table. Maximum size is at least 550cm (17ft). Males mature by 400cm (13ft) and female by 500cm (16ft).




Irrawaddy river dolphin
scientific name : Orcaella brevirostris

Usually live in South-East Asia, Indonesia, North Austrailia, papua new Guinea.
Most of Irrawaddy dolphin is die because of net or sea bumb.
Thus, they endangered species.

It's length is about 2~2.7m.
Most of color is deep blue.
It have a flexible neck that help to find food more easierly.
They dove about 30~60seconds.
specially, that dolphin do not use audio signal.
They made group about 6~10.

They usaually ate fish, octopus, and squid.

Reproduction

about 4~6age, they arrive at puberty.
They reproduce in April~June.
They gave birth in July~ December.
Their pregnancy periods is about 14month.
The baby's weight is 12.3kg and length is 96cm.
They protect about 2years by their mother.




댓글 없음:

댓글 쓰기