Ecological characteristics and the relation with marine environment of phytoplankton at neon flying squid fisheries in the North Pacific high seas.

This paper expounded and analyzed the composition and quantitative distribution of phytoplankton species,their relation with marine environmental factors and changes of center fisheries,using the ecological environment survey data of neon flying squid fishery from June to September in 2010,combined with abundance and dominance estimation method and SUFER application software.The results showed that the types of phytoplankton were complex in the North Pacific.According to preliminary identification about the phytoplankton species,there were 3 doors,28 genera and 80 species.In the east fishing ground,there were 39 species including 24 warm-water species,7 coolwater sub-frigid zone species,4 tropical far-flung species,2 temperate warm species,and 2 other ecological unnamed species.In the west fishing ground,there were 62 species including 43 warm-water species,5 cool-water sub-frigid zone species,9 tropical far-flung species,3 temperate warm species,and 2 other ecological unnamed species.The species in the east fishing ground were significantly less than that in the western fishery.But in the east there were more sub-frigid zone species than the west.This survey spanned more waters,including the east and the west fishing grounds of neon flying squid.The range was 150° E~ 170° W、38°N ~45°N of North Pacific high waters.We also discovered that production catches of neon flying squid had high frequency,which was over 14%,and the abundance of phvtoplankton was within the range of 2.98×10~3~59.87×10~3 ind/m~3.