- 期刊
- OpenAccess
Larval Development of the Red Tailed Prawn,Penaeus Penicillatus Reared in the Laboratory
紅尾蝦幼期變態之研究
摘要
紅尾蝦於28.5℃產下的受精卵，在產卵後8～11分鐘時收集，然後經30分鐘低溫（11.7℃～15.8℃）震擊，其孵化率不受影響。而11.7℃及15.8℃溫度震擊所育成的蝦苗，經與對照組（28.5℃）蝦苗放養於水泥池後，有相同的成長趨勢。但處理組蝦有較佳的越冬效果，對照組蝦在20℃急降至11.5℃之寒流中全部死亡。而且11.7℃處理組蝦在越冬期活存率較15.8℃處理組高，但相反在夏季高水溫期15.8℃處理組活存率比11.7℃組高。以SDS-PAGF電泳分析，15.8℃處理組蝦，其肌肉蛋白組成在分子量68K～94K之間有與11.7℃處理組及對照組不同表現，體質上可能已有變化。在溫度震擊之蝦體色較黑，尾扇無法展得很開，額角較短，其上下緣齒數少而且變異大，第3步脚大部份不超越第2觸角的鱗片，這些形態與紅尾蝦有所不同。經育成種蝦後，在魚塭中與紅尾蝦相同有很高的自然交尾率，但其精莢中之精子以短尾者為多。雌蝦經單眼柄切除以誘導產卵，11.7℃處理組卵巢無法發育，15.8℃處理組雖可發育產卵，但卵數少，孵化率低，幼生活力低，在無節幼蟲卽全死亡，這些現象表現似乎為多倍體但有待進一步證實。
並列摘要
Fertilized eggs at 8-11 minutes after spawning under 28.5℃,were collectedand shocked immediately in the pre-cooled water of 11.7℃ and 15.8℃ for 30minutes.Cold shocks made no significant difference in hatching rate andgrowth rate.All untreated shrimps died due to a severe cold current,whenthe water temperature dropped down sharply from 20℃ to 11.7℃,while thoseof treated shrimp still survived afterwards.The survival rate of 11.7℃-treated-shrimp was higher than that of 15.8℃-treated-shrimp in winter,but the resultwas reversal in summer.The offsprings of 15.8℃ treated shrimps were weak,with low fecundity,different protein patterns and morphological featureswhen compared with the 11.7℃ group and the control group.It is presumablythat those effects were resulted from the polyploidy in 5.8℃ group.