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

本研究進行硬殼淺蜊 (Tapes belcheri) 的人工繁殖以及稚貝培育試驗，結果顯示在水溫28℃，鹽度32 psu條件下，硬殼淺蜊受精卵於受精1.5 hr後分裂成二細胞期；2 hr後進入四–八細胞期；2.5 hr後進入十六–三十二細胞期；3 hr後進入桑椹期；4 hr後進入囊胚期；5 hr後進入擔輪子期；8 hr後發育成緣膜 (D型) 幼生；6–7天後發育成足盤緣膜幼生；8–10天後為沉底苗。將馴養在鹽度33 psu海水的硬殼淺蜊稚貝，分別移至鹽度0、5、10、15、20、25、30、35、40、45 psu的環境72 hr後，發現在10 psu以下稚貝的活存率為0；15 psu 組活存率為22.2%，20–40 psu稚貝的活存率均在95.0%以上；將鹽度提高至45 psu則活存率下降至76.7%。探討基質有無對硬殼淺蜊稚貝成長之影響，顯示無論有無基質，對於稚貝的成長沒有顯著影響。比較田間放養之硬殼淺蜊和淺蜊 (T. literatus) 之成長，結果顯示，硬殼淺蜊140天內之殼長自0.39 ± 0.07 cm成長至1.72 ± 0.17 cm；而淺蜊則是由0.63 ± 0.12 cm 增加為1.42 ± 0.17 cm，亦即硬殼淺蜊的成長速率比淺蜊為快。

Belcher’s venus clams, T. belcheri, were used to develop artificial propagation techniques and juvenile cultivation strategies in this study. The results showed that T. belcheri larvae hatched after 5 hours of fertilization and metamorphosed into juveniles 8–10 days after fertilization under conditions of 28°C and 33 psu. Juveniles raised at a salinity of 33 psu were then transferred to salinity conditions of 0, 5, 10, 15, 20, 25, 30, 35, 40, and 45 psu for 72 hours, and survival rates were measured. The survival rates of juveniles at less than 10 psu, 15 psu, 20 psu, 25–35 psu, 40 psu, and 45 psu were 0%, 22.2%, 98.9%, 97.8%, 95.6%, and 76.7%, respectively. Comparing between the presence and absence of base medium, no significant differences in the growth rates of juveniles were observed (p > 0.05). The mean shell lengths T. belcheri and T. literatus juveniles that were maintained in a field farm for 140 days increased from 0.39 ± 0.07 cm to 1.72 ± 0.17 cm and from 0.63 ± 0.12 cm to 1.42 ± 0.17 cm, respectively. Therefore, the growth rate of T. belcheri was faster than that of T. literatus..