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本文主要取材于1985—1986年长江口渔业资源试捕调查资料。研究结果表明,分布在长江口海区的虾类,由于受长江冲淡水径流的影响,形成三种生态型:(1)河口半咸水类型,如两种白虾;(2)低盐水类型,如葛氏长臂虾;(3)外侧次高盐水类型,如鹰爪虾和两种仿对虾。代表各生态型虾类,一般具有繁殖期较长的特点,其生命周期可为一年或一年多。虾类体长分布较为复杂,在当年生的幼虾生长期间,秋冬季虾群中常有幼虾和成虾混栖。因而,种群体长分布有两组群体并存。
This article is mainly drawn from the 1985-1988 trial of the Yangtze River Estuary fisheries resources to catch the investigation. The results showed that shrimp species distributed in the Yangtze River estuary formed three kinds of ecotypes due to the effects of the runoff from the Yangtze River: (1) estuarine brackish water types such as two white shrimp; (2) low salt water types, Such as Gekko long arm shrimp; (3) Lateral sub-high salinity types, such as eagle shrimp claw and two imitation shrimp. On behalf of the ecological shrimp, generally have the characteristics of longer breeding period, its life cycle can be one year or more. Shrimp body length distribution is more complicated, during the growth of young juveniles shrimp, shrimp and shrimp in autumn and winter often shrimp and shrimp mixed habitat. Thus, there are two groups of coexistence of population length distribution.