关键词: 印度洋；金枪鱼渔业；碳汇渔业；碳汇量评估；营养级

Abstract:

Pelagic fishing is an integral part of the carbon sink fishery, which not only provides consumers with high quality aquatic products, but also has a carbon sink function. Based on the assessment model Ⅰ and Ⅱ, the tuna fishery carbon sinks of China was evaluated by the data provided by Indian Ocean Tuna Commission (IOTC) and integrated with related information on trophic level from 1995 to 2012. The results showed that the mean trophic level of tuna fishery was between 4.34~4.45 from 1995 to 2012, and the frequency of 4.41~4.45 was 66.66%. The average carbon sinks of assessment model Ⅰ was 541 300 t, and the peak was 1 245 100 t in 2006. The species of BET, YFT and ALB were the major contribution to carbon sinks assessment model Ⅱ, the average value was 550 500 t, and the peak was 1 258 300 t in 2006. The results of assessment model Ⅰ and Ⅱ had the same trends, but the measuring value of model Ⅱ was lower, and the relative difference between them was only 2.35%. The systematic studies on energy transfer efficiency of tuna food web in different sea, species and life cycle should be carried out in order to accurately assess the amount of carbon sinks of tuna fishery.

Key words: Indian Ocean, tuna fishery, carbon sink fishery, carbon sinks assessment, trophic level