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北塘河口为潮汐河口,鱼卵和仔、稚鱼种类较少,共采到40种,分属于9目、19科、36属。其中以鲈形目最多,占55％,鲱形目占15％,鲤形目占12.5％,鲽形目占5％,其余各目分别占2.5％。按生态习性可分三种类型:(1)近岸河口咸淡水种类,占72.5％,(2)外海洄游种类,占7.5％。(3)淡水种类,占20％。种类和种群个体数量均存在时间和站位分布上的差异,5—7月种类和数量明显上升,从8月开始逐月下降。优势种为斑鰶、赤鼻棱鯷、梭鱼、黄姑鱼、斑尾复虾虎鱼、阿匍虾虎鱼和红狼牙虾虎鱼。
Beitang estuary is a tidal estuary, with a small number of larvae and eggs, with a total of 40 species, belonging to 9 orders, 19 families and 36 genera. Among them, Perciformes accounted for 55%, Herring accounted for 15%, Cypriniformes accounted for 12.5%, Siluriformes accounted for 5%, and the rest accounted for 2.5% respectively. According to the ecological habits can be divided into three types: (1) the coastal estuarine freshwater species, accounting for 72.5%, (2) the type of migratory sea, accounting for 7.5%. (3) freshwater species, accounting for 20%. The species and the number of individuals in the population both have differences in time and station distribution. From May to July, the species and quantity obviously increased, dropping from month to month. Dominant species of cantharidin, red nose edge ridge, barracuda, yellow croaker, spotted complex goby, A Stump goby and red spiny goby.