전어(Konosirus punctatus)의 난발생 및 자치어 형태 발달

Abstract

In order to monitor the developmental features of embryos, larvae, and juveniles of Konoshiro Gizzard shad Konosirus punctatus, the fertilized eggs were gotton using artificial insemination. Konosirus punctatus were caught in Mankyung-myeon, Kimjae, Jeollabuk-do at June of 2004, and experiments were carried out in Ichthyology laboratory in Chonnam National University. Konosirus punctatus spawned draft egg from March to June. The fertilized eggs were cultured in 19.0 - 23.0 ℃ (mean, 21.2 ℃). The eggs had spherical shape and the diameter is 1.14 - 1.34 ㎜ (mean, 1.21 ㎜). The lens began to appear from 35 hr 53 min after fertilization. At the moment, the movement of larvae was more active, and the tail was separated completely from yolk, the heart had forms, and melanophore appeared. Hatching was observed from 37 hr 10 min after fertilization. The total length of the hatched larvae was 4.26 - 5.30 ㎜ (mean, 4.96 ㎜), but the mouth and anus were not opened at the time when the larva had yolk sack, and had 22-27 myometium, and the anus located just abdominal front of the tail fin, and melanophore accumulated in the eye. Post-larvae used yolk completely after 2 day of hatching, and the total length was 4.96 - 5.74 ㎜ (mean, 5.24 ㎜). From 16 days after hatching, the tail had curved tail end, and appeared the stems for pectoral, dorsal, and caudal fins. At 53 days after hatching, the total length of post-larvae was 27.11 - 34.09 ㎜ (mean, 30.11 ㎜), and the frontal part of head developed like an adult one. At this time, fins and body are transferred to those of adult Konosirus punctatus. Fishes have a different shape and location of melanophore even in the same family. This research was tried to elucidate the early developmental features of Konosirus punctatus, together with species-specific pattern of melanophore.