Eggs Development and Larvae of the Right-eye Flounder, Limanda yokohamae Gunther

문치가자미의 난발생과 부화자어

The right eye flounders, Limanda yokohamae Gunther widely distributed in the coastal waters of Korea and Japan. On Feburuary 3, 1983, the authors obtained a number of artificial fertilized eggs from the adult fishes(male: 285mm in total length; female: 297mm) caught by a trawl. The eggs of this species is demersal and adhesive, and the diameter of these eggs was varied in $0.71{\sim}0.80mm$. The egg capsule is colorless and transparent, and the eggs do not contain any oil globules, The hatching took place in 120 hour after fertilization at the water temperature $5.5{\sim}17.0^{\circ}C$. The newly hatched larvae were $2.64{\sim}2.72mm$ in total length with long trunk. Myotome number was $9{\sim}10+30{\sim}32=39{sim}42$ and yellowish brown melanophores were appeared. In 3 days after hatching out. The larvae attained 3.3mm in total length, and the mouth began to move. Xanthophore appeared also on the opereulum at this time. After 7 days the larvae attained 3.70mm in total length, and became the postlarvae absorbing the yolk completely.

1983년 2월 3일 부산어시장에서 성숙된 문치가자미를 채집하여 실험실로 운반한 후 인공수정에 의한 난발생과정과 부화자어에 대하여 관찰한 결과를 요약하면 다음과 같다. 1. 난은 구형이며 침성점착난으로 난경은 $0.71{\sim}0.80mm$ 이고 유구는 없다. 2. 사육시 수온은 $5.5{\sim}17.0^{\circ}C$, 염분농도는 $30.8{\sim}32\%$의 범위에서 수정후 120시간만에 첫 부화가 나타났다. 3. 부화직후의 자어는 전장이 $2.64{\sim}2.72mm$ 이며 눈은 완전히 착색되지 않았던 근절수는 $9{\sim}10+30{\sim}32=39{sim}42$. 몸에는 황갈색소포가 나타난다. 4. 부화후 3일째의 전장 3.3mm의 자어는 입이 열리며 아가미뚜껑 위에 황색소포가 나타난다. 5. 부화후 7일째의 전장 3.70mm의 자어에서는 난황은 거의 흡수되고 흔적만 남는다.