農業部-水產試驗所全球資訊網農業部-水產試驗所全球資訊網

象牙鳳螺 (Babylonia areolata) 是台灣海域高經濟價值的食用貝類之一，近年來由於過度捕撈利用，造成資源量急遽減少。本研究旨在建立人工誘發產卵技術及觀察其幼苗胚胎發育，以祈建立種苗大量生產技術。試驗期間以細砂組、細砂混合碎珊瑚組、碎珊瑚組及裸缸組等四組不同底質進行產卵試驗。結果顯示，在產卵方面三種不同底質間均無顯著差異(p > 0.05），而與裸缸組間則有顯著差異 (p < 0.05)。受精卵係在葵花子片狀透明卵鞘內，為圓形黃褐色分離的沉性卵，平均卵徑300 ± 14.5μm。在水溫27.4 ℃時，受精卵在約1 hr 20 mins形成第一極體，1 hr 50 mins形成第二極體，2 hrs 10 mins以縱向對等分裂成二細胞卵。3 hrs 35 mins第三次分裂，係縱向對等分裂成四細胞，9 hrs 10 mins第四次細胞分裂成八細胞。24 hrs後發育成囊胚期，29 hrs 形成原腸期，受精54 hrs後形成胚體口前纖毛，70 hrs外層幼殼開始分泌，面盤出現而成為擔輪子期，80 hrs出現平衡胞，89 hrs顯現黑色眼點及腹足前剛毛，105 hrs心臟開始跳動，142 hrs第一觸角出現，144 hrs 10 mins幼生從卵鞘孵出，藉著面盤纖毛於水中浮游運動而形成覆面子期。

The spotted babylon (Babylonia aerolata) is one of the highest value marine gastropods in Taiwan. In resent years, the heavy exploitation of spotted babylon has resulted in a rapid decrease in its natural resources. Therefore, in order to develop a technique for mass seed production, four treatments of different substrata including sand, sand with fragmental coral, fragmental coral and control groups were designed to evaluate the efforts on the spawning of this species. The results showed that there were no significant difference among the three-experimental groups. However, they were significantly more effective than in the control group.The fertilized eggs, enveloped in sun-flower-seed-shape capsule, were granular, spherical, yellowish-brown and demersal, with a mean diameter of 300 ± 14.5μm. The formation of the first polar body occurred about 1 hr 20 mins after fertilization at the water temperature of 27.4 ℃. The 2-cell stage occurred at 2 hrs 10 mins, and the 4-cell stage occurred at 3 hrs 35 mins. At 9 hrs 10 mins, 8-cell stage formed, then blastula stage at 24 hrs, gastrula stage at 29 hrs. Prototrochal cilia appeared at 54 hrs and the trochophore stage developed at 70 hrs. Vesicle appeared at 80 hrs, black eye-spot and proleg cilia appeared at 89 hrs. Heartbeat began at 105 hrs, the first antenna appeared at 142 hrs, and larvae hatched out from the capsules as veliger stage at 144 hrs 10 mins.