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Sigma KEE - Fish

鱼

这是一种冷血的水生 Vertebrate，身上的鱼鳍和用腮呼吸是它们的特征，这包括硬骨 Fish，如鲈鱼，或者软骨鱼如鲨鱼，也包括没有颚的 Fish，如七鳃鳗或盲鳗。

Relationships
Parents	冷血脊椎动物	Vertebrates whose body temperature is not internally regulated.
Children	Cod
	观赏鱼
	鲑鱼
	Skate	Skates are cartilaginous fish belonging to the family Rajidae in the superorder Batoidea of rays. There are more than 200 described species in 27 genera. There are two subfamilies, Rajinae (hardnose skates) and Arhynchobatinae (softnose skates). [text courtesy Wikipedia]
	Tuna