Based on the seasonal survey data of Loligo beka in the East China Sea(26°00'~35°00'N, 121°00'~126°30'E) in 2008-2009,this paper analyzed its quantity distribution and population composition characteristics.The results showed that:in the pair-trawling fishery,annual fishing yield of Loligo beka accounted for 0.7%in the total yield,for 50%~60%in the squid catch.The total average resources density index of was 358.9 g/h.Time-space distribution of Loligo beka was different obviously,with an average of resource...