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中文摘要：
凤鲚（Coilia mystus）是西太平洋一种短距离江海洄游的重要经济鱼类。为探讨其在溯河产卵洄游过程中卵巢发育的能量来源,本文对长江口繁殖群体的雌性个体的性腺发育、摄食状况以及肝胰腺、肌肉和卵巢等的粗脂肪含量作了分析。结果显示,（1）凤鲚的卵巢发育并不同步,繁殖初期的5月下旬以Ⅲ期和Ⅳ期为主,两者合占雌性个体的87%;之后,成熟个体逐渐增多,至繁殖期结束前的8月,Ⅴ期个体占44.27%。（2）77%的Ⅲ期和90%的Ⅳ期以及所有Ⅴ、Ⅵ期个体均为空胃,但有93%的Ⅱ期个体胃充塞度为1级和2级,表明凤鲚雌性个体在繁殖期并不摄食,但产卵不久即开始摄食。（3）Ⅲ期雌性个体的肌肉粗脂肪含量仅1.92%（鲜重,氯仿-甲醇法）,而卵巢却聚集了身体总脂量的61.88%。这种将有限能量集中于繁殖器官的现象,可能是小型鱼类难于作长距离溯河产卵洄游的主要原因之一。（4）自Ⅲ期至Ⅵ期,雌性个体肌肉和肝胰腺的脂肪含量共下降了12.5%和14.35%,其中Ⅲ期至Ⅳ期的早期发育阶段分别下降了7.29%和3.65%,而Ⅳ期至Ⅴ期的晚期发育阶段则分别下降了4.49%和8.63%。这可能预示着肌肉储存的能量首先供给了繁殖活动早期的洄游和代谢,而肝胰腺储存的营养则可能是完成最后产卵过程的助推器。
英文摘要：
Osbeck’s grenadier anchovy（ Coilia mystus） is an important economic fish with a habit of short distance migration between river and sea,distributing in the western Pacific Ocean. In order to understand the energy transition during ovary development,this study analyzed the ovary development,feeding status,and crude fat contents in hepatopancreas,muscle and ovary of spawning C. mystus in the estuary of Yangtze River.The results showed that：（ 1） oogenesis of C. mystus was not synchronous. In the early period of reproduction in late May,87% of female individuals were in phases Ⅲ and Ⅳ. Then the number of mature female individuals became larger gradually. By the end of spawning in August,the individuals in phase Ⅴ accountedfor 44. 27%;（ 2） 77% individuals in phase Ⅲ,90% individuals in phase Ⅳ,and all individuals in phasesⅤ,Ⅵ had no food in the stomach and gut. In contrast,93% individuals in phase Ⅱ showed stomach fullness of classes 1 and 2,suggesting that C. mystus fed nothing during spawning period and began to take food soon after spawning;（ 3） the muscle fat content of female individuals in phase Ⅲ was only 1. 92%（ wet weight,chloroform-methanol extraction）,however,ovary gathered 61. 88% of the total crude fat of the whole body.This phenomenon allocating most energy to propagative organ was possibly one of the main reasons explaining the difficulty for the small fish to go long distance anadromous migration;（ 4） fat content in muscle and hepatopancreas decreased by 12. 5% and 14. 35% respectively from phase Ⅲ to phase Ⅵ. The fat content in muscle and hepatopancreas decreased by 7. 29% and 3. 65% respectively from phase Ⅲ to phase Ⅳ,in comparison with decrease of 4. 49% and 8. 63% respectively from phase Ⅳ to phase Ⅴ. This result suggested that the nutrition stored in the muscle mainly supplied energy for migration and metabolism during the early period of reproductive activity,while nutrition in hepatopancreas might be a booster for completing the final spa
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