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2013年1月至12月,在杭州湾北部水域设置10个站点,按月用大型仔稚鱼网(口径1.3 m,网目0.5 mm)进行了12个航次的调查,共采集到鱼卵81粒,隶属于4科6种;仔稚鱼143 782尾,隶属于23科69种。其中河口型鱼类(34种)和海洋型鱼类(24种)多于洄游型鱼类(4种)和淡水型鱼类(7种)。鱼卵中以棘头梅童鱼(Collichthys lucidus)居多,而仔稚鱼中个体数最多的是髭缟虾虎鱼(Tridentiger barbatus),占总渔获物的62.88%,其后依次为棘头梅童鱼(13.02%)、凤鲚(Coilia mystus,9.22%)、黄鳍刺虾虎鱼(Acanthogobius flavimanus,2.56%)、斑尾刺虾虎鱼(Acanthogobius ommaturus,2.32%)。前弯曲期仔鱼占总渔获物数量的89.12%,6月最多(85.31%)。春夏两季仔稚鱼物种数和密度要显著高于秋冬两季,6月密度急剧增高,达到13.50个/m3,7月物种数最多(18种)。Margalef丰富度指数(D)总体变化较大,月间变化相对剧烈,7月最高,Shannon-Wiener指数(H’)和Pielou均匀度指数(J’)变化幅度相对较小。
From January to December 2013, 10 sites were set up in the northern waters of Hangzhou Bay and 12 voyages were surveyed on a monthly basis with large-scale larvae (1.3 m in diameter and 0.5 mm in mesh). A total of 81 eggs , Belonging to 4 families and 6 species; larvae 143 782 larvae, belonging to 23 families and 69 species. Among them, the number of estuarine species (34 species) and marine species (24 species) is more than that of migratory species (4 species) and freshwater fish species (7 species). Collichthys lucidus was the most common in fish eggs, while Tridentiger barbatus was the most abundant in larvae, accounting for 62.88% of the total catch, followed by spines Melastoma (13.02%), Coilia mystus (9.22%), Acanthogobius flavimanus (2.56%) and Acanthogobius ommaturus (2.32%). Pre-bent larvae accounted for 89.12% of the total catch, up from June (85.31%). The number and density of juvenile fish in spring and summer were significantly higher than those in autumn and winter, and the density increased sharply in June, reaching 13.50 / m3 in July and 18 species in July. The Margalef abundance index (D) varied greatly from month to month with the highest monthly variation. The highest change in July was observed in Shannon-Wiener index (H ’) and Pielou evenness index (J’).