スズキLateolabrax japonicus CUVIERの稚魚の鱗の初期発生とその櫛鱗の棘の発生経過
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概要
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In this paper we discuss the early developmental process of the scales and their ctenii, which have a radial series type arrangement, in the Japanese common sea bass, Lateolabrax japonicus CUVIER. When the fish grow to about 18-20mm, in standard body length, about four or five scales first appear near the lateral middle line in the anterior region of the caudal peduncle. Starting from there, the scale formation spreads in an anterior and posterior direction, and toward the dorsal and ventral also. The first scales are only circular discs without any sculpture, and they are about 0.21mm, in diameter. In this species, the lateral line does not coinside with the lateral middle line except at the caudal peduncle, so lateral line scales are formed later than the early scales on the middle line. The first spine emerges near the apex of the scale when the fish has grown to about 22-23mm, and after a while the second and third ones are formed laterally to the first. The destruction of the middle and distal portion of the spine begins when the fish grows to about 30mm. One side or sometimes both sides of the middle portion of a completely formed spine begins to melt away, and after a while the pointed distal portion drops away also. Only the proximal portion remains, and a new spine appears in the postero-inner region of the middle portion of the first spine. In this way the radial series arrangement of ctenii is gradualy completed. These facts support the conjecture that the ctenii from these types of ctenoid fishes are formed by the destruction of middle and distal portions of a spine followed by the appearance of second spine in the same location. The ridges, grooves, ctenii and breadth or length of the scales increase in number or length in accordance with the growth of the fish.
- 社団法人日本動物学会の論文
- 1964-01-15
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