At present,many factors are exerting more and more pressures on purse seining ships and enterprises,such as the high fuel prices,the stricter fishery protection measures from pacific islands countries,and increasing fishing efforts,the higher cost of fishing stuff and labor,and the seasonal or annual variations and increasing scarcity of tuna resources.

Analysis on distribution of yellowfin tuna purse seine catches in the Western Central Pacific Ocean;

Analysis on spatial-temporal distribution of skipjack tuna catches by purse seine in the Western and Central Pacific Ocean;

A preliminary study on fishery of tuna purse seine in China;

Design features of tuna seiner;

Analysis of resistance and propulsion for tuna seiner;

The results showed that the nitrogen was the main pollution factor,including total nitrogen,ammonia nitrogen and nitrate nitrogen,which mainly came from the inlet river,precipitation,aquatic-breeding and point sources.