Variations in the mean trophic level and large fish index of fish community in Haizhou Bay, China

doi:10.13287/j.1001-9332.201908.033

Abstract

Abstract: Based on the bottom trawl surveys in spring (May) and in autumn (September to October) from 2011 to 2017 (except 2012) in Haizhou Bay, variations in the mean trophic levels (MTL) and large fish index (LFI) of fish community were examined to understand the changes of fish community structure in Haizhou Bay. The results showed that the dominant fish species were Hexagrammos otakii, Enedrias fangi, Syngnathus acus, Pseudosciaena polyactis and Saurida elongata, which had obvious seasonal variation. The mean trophic level of fish community varied significantly among different years and seasons. Generally, MTL in autumn was higher than that in spring, and the variation of which in autumn always lagged behind that in spring. The result of LFI calculation showed that the large fish resources declined and fish community structure in Haizhou Bay showed an obvious tendency of miniaturization in recent years.

WU Xiao-tong, DING Xiang-xiang, JIANG Xu, XU Bin-duo, ZHANG Chong-liang, REN Yi-ping, XUE Ying. Variations in the mean trophic level and large fish index of fish community in Haizhou Bay, China[J]. Chinese Journal of Applied Ecology, 2019, 30(8): 2829-2836.

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