イバラトミヨ Pungitius pungitius (LINNAEUS)の稜鱗の発達について

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The formation of the scutes in ten-spined sticleback, Pungitius pungitius (LINNAEUS) does not arise until the fish grow to 15mm in total body length. When the fish reach to the length of about 15mm, about four small scutes first appear on the lateral line in the poster-ior region of caudal peduncle wherefrom the scute formation runs mainly on anterior direc-tion. In the early developmentrl stage of scute, a roof gutter shaped mucous tube and main ridges are formed in both sides of neural pore. In the middle stage, branching of lateral ridges occurs from the sides of main ridges, and in the last stage, scutes with a cylindrical mucous tube and net-work lateral ridges are completed. Before the fish come to the adult, more the 30mm in total body length, two or three small scutes, which show a strong resemblance to scale-like particles, are formed in the an-terior region of the lateral line. On the sides of the tail in and the anterior region of the lateral line, the scute formation can be seen, but never in the middle part of the lateral line, throughout all the stages of its development. Then the total number of the scutes in adult fish turned out to be (2-3)+(10-12), and the arrangement of these showed the Semiar-mata type peculiar to this species. And in this species, we could not find such a remarkable difference between square and rhombic type scutes as in that of Pungitius sinensis. But as a whole, the developmental process of the scutes of this species has a striking resemblance to that of P. sinensis, and from this fact, it may be recognized that this species, P. pungitius, is phylogenetically close to P. sinensis.
公益社団法人日本水産学会の論文

著者

五十嵐清
福井県立武生高等学校

イバラトミヨ Pungitius pungitius (LINNAEUS)の稜鱗の発達について

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