黄海南部沿岸(鋑)鱼仔稚鱼的表层分布及移动趋势

2005年5月22～28日，在黄海南部沿岸19个站位点，用浮游生物网（口径80cm，网目0．5mm）在表层进行水平拖网，共采集到鮻鱼仔稚鱼1915尾，体长范围2～23mm，优势体长4～5mm。按发育阶段划分，弯曲期仔鱼出现量最大，占58．8％，其后依次为前弯曲期仔鱼（25．4％），后弯曲期仔鱼（15．4％），稚鱼（0．4％）。各站位中以St．4平均密度最高（243．3尾／100m^3），St．2最低（0．2尾／100m^3），其它站位为0．2～35尾／100m^3。自北至南鮻鱼仔稚鱼的发育阶段有递增的趋势，且外侧海域发育阶段相对较早，沿岸海域则相对较晚，揭示了其随海流向沿岸巡游趋势的可能性。加强对沿岸水域的保护，将有利于保证鮻鱼仔稚鱼的资源补充量。

Horizontal distribution and moving tendency of Liza haematocheila larvae and juveniles in the coastal surface of the South Yellow Sea

A total of 1 915 individuals of Liza haematocheila larvae and juveniles were collected with a plankton net(80 cm mouth-diameter,0.5 mm mesh-apesture) by way of horizontal trawl in 19 coastal stations of the South Yellow Sea from May 22 to 28,2005.The body-length ranged from 2 to 23 mm and those of 4 to 5 mm took the most dominance.Among these stations,the most dominant individuals were flexion larvae,accounting for 58.8%,and then preflexion larvae(25.4%),postflexion larvae(15.4%) and juveniles(0.4%).The highest average density was at St.4(243.3 ind./100 m3) and the lowest was at St.2(0.2 ind./100 m3),and others were from 0.2 to 35 ind./100 m3.The developmental stage showed the gradually increasing tendency from north to south area.In addition,the developmental stage in outer area was relatively earlier than in coastal area.These results revealed the possibility of the moving tendency toward the coast along with the current.It was necessary to protect the coastal area in order to maintain the resource recruitment of this species.