Fishes . out is predominant. In some fishes,Haswell.) especially those of elongate form, as the needle-fish (Tylosuriis), the ovary of but one side isdeveloped. Protection of the Young.—In most fishes the parents takeno care of their eggs or yotmg. In some catfishes {Pldtystacus)the eggs adhere to the under surface of the female. In thesea-horses and pipefishes a pouch is formed in the skin, usuallyunderneath the tail of the male. Into this the eggs are thrust,and here the young fishes hatch out, remaining until large enoughto take care of themselves. In certain sea catfishes {Caleichthys)the
Fishes . out is predominant. In some fishes,Haswell.) especially those of elongate form, as the needle-fish (Tylosuriis), the ovary of but one side isdeveloped. Protection of the Young.—In most fishes the parents takeno care of their eggs or yotmg. In some catfishes {Pldtystacus)the eggs adhere to the under surface of the female. In thesea-horses and pipefishes a pouch is formed in the skin, usuallyunderneath the tail of the male. Into this the eggs are thrust,and here the young fishes hatch out, remaining until large enoughto take care of themselves. In certain sea catfishes {Caleichthys)the male carries the eggs in his mouth, tluis protecting themfrom the attacks of other fishes. In numerous cases the maleconstructs a rough nest, which he defends against all intruders,against the female as well as against outside enemies. Thenest-building habit is especially developed in the sticklebacks{(lasterosteidcE), a group in which the male fish, though a pygmyin size, is very fierce in
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