한국산 웅어(Coilia nasus) 자치어의 형태 발달

Abstract

The morphological development of Coilia nasus were described based on specimens collected from Nakdong River estuary of Busan in August 2010. All juvenile specimens have dorsal fin rays 13, anal fin rays 91-97, pectoral fin rays 18, pelvic fin rays 6-7, caudal fin rays 19-20, vertebrae 78 being identified as Coilia nasus. In flexion larval stage (10.9-14.3 mm SL), the posterior tip of notochord curved approx. 45°, the mouth and anus opened. The number of caudal fin rays was completed as 19 and dorsal and anal fin rays appeared. Single row dot-shape melanophores on ventral portion of anterior body and anal fin base. In post-flexion larval stage (15.5-23.9 mm SL), the posterior tip of notochord curved completely as 90°, the body depth tended to increase, and anus located in half of body. The number of dorsal fin rays and vertebrae were completed as 13 and 77-79, respectively. In juvenile’s stage (24.0-33.9 mm SL), the development of all fin rays were completed and the upper pectoral fin rays elongated, extends to beyond the anus. The tip of snout projecting anteriorly, and sharp scutes were present in the midventral line of body from isthmus to anterior margin of anus.