| 英文摘要 |
Japanese eel (Anguilla japonica) is one of the most important culture species in Taiwan. The fluctuation of elvers catch in recent years has not only suffered the income of capture fishers but also the culture industry itself. In this study, we analyze AVHRR sea surface temperature images and eel elvers fishery data to find out the relationship between Kuroshio current and abundance of elver immigrated in Yen-Liau Bay, Northern Taiwan. The shortest distances between Kuroshio edge, detected from AVHRR data by edge detection technique, and the Bay were used as the forcing indices of passive transport of eel elver. We observed successive series of such distances and its interaction with monthly SST images, catch and CPUE of elvers. We found that elvers catch and CPUE were higher while the distance, ranging from 4 to 32 nautical miles, were shorten. It suggests that more elvers will be transported into the Bay, if Kuroshio current moves closer to the Bay. We also examed the variability of the three variables, the distance, catch and CPUE during El Nino, La Nina and normal periods. The results indicated that there were no significant difference (p ＞ 0.05) among the three variables during both El Nino and normal periods. However, significant differences (P |
