열대어 안시(Ancistrus sp.)의 난발생 및 자치어 형태발달

Morphological Development Eggs, Larvae and Juvenile of Ancistrus sp.

열대어 안시의 난과 자치어의 형태 발달 연구는 여수시에 위치한 전남대학교 자원생물 실험실에서 진행되었다. 수정란은 구형으로 유구는 없고, 난황은 황색이었으며, 점착침성란으로 난경은 약 4.16~4.30㎜ (평균 4.23±0.07 ㎜)이었다. 낭배기 후 60시간에는 고리부터 난막을 뚫고 나오면서 부화하였다. 부화 직후의 자어는 전장 7.23~7.87 ㎜ (평균 7.55±0.33 ㎜)이었으며, 이튿날 제1등지느러미와 가슴지느러미가 관찰되었다. 부화 7일째 후기자어는 전장 12.50~12.82㎜ (평균 12.66±0.15 ㎜)로 입과 항문이 열렸으며, 제2등지느러미가 발달하기 시작하였다. 부화 15일째 개체는 전장 14.76~15.02 ㎜(평균 14.89±0.13㎜)의 치어기에 도달하였다.

Morphological development of eggs, larvae and juvenile of Ancistrus sp. were studied in the laboratory at the Chonnam National University in Yeosu. Fertilized eggs were spherical in shape, demersal, adhesive, and yellow color. The diameter was 4.16~4.30 ㎜ (4.23±0.07 ㎜, n=5). The eggs were hatched after 60 hours from gastrula stage. The total length(TL) of newly hatched larvae was 7.23~7.87 ㎜ (7.55±0.33 ㎜, n=2). At 2 days after hatching, the larvae, 7.96~8.05 ㎜ (8.00±0.05 ㎜, n=2) in TL, had a 1st dorsal fin and pectoral fin. At 4 days after hatching, the total length was 10.11~10.36 ㎜ (10.23±0.12, n=2) and the head was developed. At 7 days after hatching, the larvae, 12.50~12.82㎜ (12.66±0.15 ㎜, n=2) in TL, were opened mouth and anus and had a 2nd dorsal fin. At 15 days after hatching, the total length was 14.76~15.02 ㎜ (14.89±0.13 ㎜, n=2), and transferred to juvenile stage showing similar features with those of the adult fishes.