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Abstract The species composition ,density distribution and diversity of nekton catch were analyzed ,based on data from fisheries resources investigation by bottom trawl in waters of Yantian Harbor area coastal Fu‐jian province in November 2012 and March 2013 .The results showed that there were 66 speceis of nekton in the water ,including 40 fish species (60 .6% ) ,23 crustacean (34 .8% ) ,and 3 cephalopod (4 .5% ) .The 9 species had relative importance index (IRI) of over 500 ,including half smouth tongue‐sole Cynoglossus semilaevis ,edible mantis shrimp Oratosquilla oratoria ,Sillago sihama ,Charybdis bimaculata ,periscope shrimp Trachypenaeus curvirostris ,Trypauchen vagina ,Thryssa mystax ,large mouth craker Pseudosci‐aena crocea and Parapenaeposis hardwickii .The density of biomass (weight and number) was 996 .31 kg/km2 and 135 .64 × 103 ind ./km2 in November 2012 and 668 .25 kg/km2 and 87 .50 × 103 ind ./km2 in March 2013 .The nektons had richness (D) of 3 .20 in range of 1 .77—5 .73 ,Shannon‐wiener index (H′)3 .49 in range of 1 .77—5 .73 ,and evenness index ( J′) 0 .77 in range of 0 .58—0 .89 .Overall ,the fisheries ecologi‐cal environment in the water is favorable ,the species of nektons are abundant ,the species were well‐dis‐tributed and the community construction was stabilization ,wich was suitable for nekton growing and breeding .
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Received: 25 June 2016
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