Abstract: The fluctuation in mean trophic level （TLi ） of tuna fishery in the Indian Ocean was evaluated by the data provided by Indian Ocean Tuna Commission （IOTC） and integrated with related information on trophic level of selected fish species collected from Fishbase from 1950 to 2003. A significant decrease in TLi appeared in 1950＇s, fluctuated increase from 1960＇s to 1980＇s, and constant after 1990＇s. There was an inverse correlationship between catch of tuna fishery and TLi in 1950＇s, TLi increasing with increase in the catch in 1960＇s. There was no significant relationship between TLi and catch in 1970＇s. A positive correlationship between TLi and catch was observed in 1980＇s, TLi being stable after 1990＇s. Fishing -in -balance index （FIB） showed a straightly increasing trend from 1951 to 1956, a fluctuated increasing from 1957 to 1975, and a straightly increasing trend after 1976.
朱国平, 周应祺, 许柳雄. 印度洋金枪鱼渔业平均营养级的长期变动[J]. 大连海洋大学学报, 2008, 23(6): 484-488.
ZHU Guo-ping, ZHOU Ying-qi, XU Liu-xiong. Long- term changes in the mean trophic level of tuna fishery in the Indian Ocean. Journal of Dalian Ocean University, 2008, 23(6): 484-488.
2008, Vol. 23 
