Spatial heterogeneity of Trichiurus japonicus and small-scale fish in East China Sea and their spatial relationships
东海带鱼和小型鱼类空间异质性及其空间关系

Based on the investigation at 121 positions in East China Sea in 2001 Autumn,this paper analyzed the spatial heterogeneity of hairtail (Trichiurus japonicus) and seven kinds of small-scale fish (Setipinna taty,Collichthys lucidus,Champsodon capensis,Amblychaeturichthys hexanema,Acropoma japonicum,Benthosema pterotum and Apogon lineatus),and the spatial relationships among them.The results indicated that the semivariogram curve of hairtail was very similar to those of Apogon lineatus,Amblychaeturichthys hexanema and Acropoma japonicum,with highly significant correlations (P<0.01),and the semivariograms of Setipinna taty and Collichthys lucidus appeared as pure nugget effect.The others could be described as spherical or exponential model that had high spatial autocorrelation.The ranges of Apogon lineatus,Amblychaeturichthys hexanema and Acropoma japonicum were equal to or beyond that of hairtail (265 km).Hairtail was spatially close to these three species,and thus,the latter might be the main preys of hairtail.