Embryonic, larval and juvenile development of the roughskin sculpin,Trachidermus fasciatus (Scorpaeniformes: Cottidae)
- 127 Downloads
Embryonic, larval and juvenile development of the catadromous roughskin sculpin,Trachidermus fasciatus, were described using eggs spawned in an aquarium. The eggs, measuring 1.98–2.21 mm in diameter, were light reddish-yellow and had many oil globules, 0.05–0.18 mm in diameter. Hatching occurred 30 days after spawning at 2.3–11.3°C. The newly-hatched larvae, measuring 6.9–7.3 mm BL, had a single oil globule, 9–10+25–26=34–36 myomeres and 6 or 7 large stellate melanophores dorsally along the gut. The yolk was almost resorbed, number of pectoral-fin rays attained 16–17, and two parietal, one nuchal and four preopercular spines were formed, 5 days after hatching, at 8.2–8.4 mm BL. The oil globule disappeared, and one supracleithral spine was formed, 11 days after hatching, at 8.9–9.5 mm BL. Notochord flexion began 15 days after hatching, at 9.7–10.3 mm BL. A posttemporal spine was formed 20 days after hatching, at 10.7–10.9 mm BL. The first dorsal fin spines (VII–VIII), second dorsal fin and anal fin rays (18–19, 16–18, respectively) appeared 23 days after hatching, at 12.0–13.7 mm BL. The pelvic fin spine and rays (I, 4) were formed and black bands on the head and sides of the body began to develop 27 days after hatching, at 13.8–15.8 mm BL.
Newly-hatched larvae swam just below the surface in the aquaria. Preflexion larvae (8.9–9.5 mm BL), in which the oil globule had disappeared, swam in the middle layer, while juveniles (13.8–15.8 mm BL) began swimming on the bottom of the aquaria. Swimming behavior observed in the aquaria suggested that the fish started to change to a demersal existence at the juvenile stage.
Key wordsEgg larva juvenile Trachidermus fasciatus Japan
Unable to display preview. Download preview PDF.
- Choi, K., S. Jeon, I. Kim and Y. Son. 1990. Colored illustrations of the freshwater fishes of Korea. Gobunsha, Seoul. 277 pp. (In Korean with English abstract.)Google Scholar
- Kojima, J. 1988.Cottus kazika. Pages 843–845in M. Okiyama, ed. An atlas of early stage fishes in Japan. Tokai Univ. Press, Tokyo. (In Japanese)Google Scholar
- Miyadi, D., H. Kawanabe and N. Mizuno. 1976. Colored illustrations of the freshwater fishes of Japan. Hoikusha, Osaka. 462 pp. (In Japanese.)Google Scholar
- Nakamura, M. 1984. Key to the freshwater fishes of Japan fully illustrated in color. Hokuryukan, Tokyo. vi+258 pp. (In Japanese.)Google Scholar
- Shao, B., G. Shen, Y. Qiu, Y. Shao, Z. Tang and Z. Xue. 1980. On the breeding habit ofTrachidermus fasciatus Heckel. J. Fish. China, 4: 81–86, pls. 1, 2. (In Chinese with English abstract.)Google Scholar
- Sugita, A. and H. Yamada. 1995. Behavioral and morphological changes in reared larvae and juveniles of the four-spine sculpin,Cottus kazika. Suisanzoshoku, 43: 11–18. (In Japanese with English abstract.)Google Scholar
- Takita, T. and H. Chikamoto. 1994. Distribution and life history ofTrachidermus fasciatus in rivers around Ariake Sound, Kyushu, Japan. Japan. J. Ichthyol., 41: 123–129. (In Japanese with English abstract.)Google Scholar
- Tsukahara, H. 1952. The life history and habits of the sculpin, “Yama-no-kami”,Trachidermus fasciatus Heckel. Sci. Bull. Fac. Agr. Kyushu Univ., 12: 225–238. (In Japanese with English abstract.)Google Scholar
- Yabe, M. 1985. Comparative osteology and myology of the superfamily Cottidae (Pisces: Scorpaeniformes), and its phylogenetic classification. Mem. Fac. Fish. Hokkaido Univ., 32: 1–130.Google Scholar
- Zhang, R., S. Lu, C. Zhao, L. Chen, Z. Zang and Y. Jiang. 1985. Fish eggs and larva in the off shore waters of China. Shanghai Sci. Technol. Press, Shanghai. ii+206 pp. (In Chinese.)Google Scholar
- Washington, B. B., H. G. Moser, W. A. Laroche and W. J. Richards. 1984. Scorpaeniformes: development. Pages 405–428in H. G. Moser, W. J. Richards, D. M. Cohen, M. P. Fahay, A. W. Kendall, Jr. and S. L. Richardson, eds. Ontogeny and systematics of fishers. Am. Soc. Ichthyol. Herpetol. Spec. Publ. 1.Google Scholar