六十年代后期,黄渤海带鱼种群逐渐衰减,到七十年代中期已形不成渔业。但从七十年代末期,黄海中部秋季带鱼的产量又明显的回升,近几年已达到相当的规模,几个主要渔业公司秋季多来此捕捞。这股鱼从何而来?隶属于哪一个种群有不同的看法。这就给渔业生产和研究者们提出了一个新的课题。 研究鱼类洄游的传统方法是标志放流。但它需用活鱼,且因回收率很低,要求放流鱼的数量较多,尤其是象带鱼这样一些离水后容易 In the late 1960s, the Yellow Sea and the Baltic Sea fish populations gradually declined and by the mid-1970s no fishery was formed. However, since the late seventies, the yield of octopus in the central part of the Yellow Sea has rebounded sharply in recent years and has reached a considerable scale in recent years. Several major fishing companies have harvested more in the fall. Where do the fish come from? Which species belong to the group have different opinions. This raises a new topic for fisheries producers and researchers. The traditional method of studying fish migration is to mark the release of fish. However, it requires live fish, and because of the low recovery rate, it is required to release a larger quantity of fish, especially after it leaves the water