単眼性のサケ稚魚に見られた異常体色に就いて

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In this paper the author has described on the external morphology of deformed chum salmon parr (Oncorhynchus keta) with aberrant body coloration. Moreover, the histology of some endocrine glands and melanization of skin were observed. 1. The author thought that this monstrosity belongs to “Synophthalmia bilentica” in WERBERs classification, because it was under the condition of the approachment of both eyes, poor development of upper jaw, protruding of lower jaw, and uniting of nostrils which lie in the apex of head. The atrophy of each fins and the delaying of differentiation of visceral organs were recognized. 2. Although the parr marks (lateral bars) and other dark spots were not founded, while the body coloration of this synophthalmic chum salmon parr shows pallor like as in the metamorphosing smolt stage salmon. The epidermis of synophthalmic fish is thicker and also the melanization is denser than those of normal parr stage fish. As the melanin granules not exist in the melanophores, so that these granules do not controlled by adrenergic nerves. Furthermore, there are no scales in body sides. Thus the origin of body color between synophthalmic parr and metamorphosing smolt salmon differs with each other. 3. The deformation and retardation of development of forebrain, chiefly hypothalamus, pituitary gland, saccus vasculosus and pineal body were recognized, on the contrary the hind brain was no changed. The histology of the thyroid gland appeared to be in the condition of hypofunctioning figure. 4. The author has discussed on the origin of development of these abnormalities.
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単眼性のサケ稚魚に見られた異常体色に就いて

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