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根据2010年春季(5月)和秋季(9月)在苏北浅滩南部如东水域获得的鱼类资源调查资料,分析苏北浅滩如东海域鱼类密度的时空分布,研究鱼类优势种对总资源密度的贡献和水域环境对鱼类分布、产卵及索饵习性的影响,探讨这些特征反映这一水域的渔场属性。结果显示:5月和9月鱼类尾数密度分别为1.33×103ind/km2和2.02×103ind/km2、重量密度分别为76.35 kg/km2和35.12 kg/km2;两个季节鱼类资源密度平面分布特征呈现相同的规律,都是东部外海水域高于西部沿岸一侧水域;鱼类种类数秋季高于春季;种类数与多样性的分布格局与资源密度相似,也是东部外海水域高于西部沿岸一侧水域。逐步回归分析显示,水深对资源密度相关关系较显著,水深较高的海域往往是资源密度集中分布的区域。5月,小黄鱼(Larimichthys polyactis)对尾数和重量贡献率均较大,为最重要的优势种,而鱼(Miichthys miiuy)对鱼类尾数贡献率最大,也为该季重要的优势种;9月,棘头梅童鱼(Collichthys lucidus)对尾数贡献率最大,对重量贡献率也较大,为9月最重要的优势种。相比我国其他海域,优势种几乎都为我国近海主要经济鱼类。因而可以认为,苏北浅滩以及外侧吕泗渔场海域是经济鱼类的产卵场和索饵场,苏北浅滩对于吕泗渔场的形成具有重要的意义。
Based on the survey data of fish resources collected in Rudong waters in the southern part of North Jiangsu in spring (May) and autumn (September), the temporal and spatial distribution of fish densities in the Rudong coast of northern Jiangsu were analyzed to study the effects of dominant species The contribution of total resource density and the impact of water environment on the distribution, spawning and bait habits of fish, and explores the characteristics of fisheries that reflect these waters. The results showed that the mantissa densities of fish in May and September were 1.33 × 103ind / km2 and 2.02 × 103ind / km2, respectively. The weight densities were 76.35 kg / km2 and 35.12 kg / km2, respectively. The distribution characteristics of fish resource density in two seasons The same pattern was found in the outer waters of the eastern part of the sea than in the western part of the coast. The number of fish species in autumn was higher than that in spring. The distribution pattern of number and diversity was similar to the resource density. Waters. The stepwise regression analysis shows that the correlation between water depth and resource density is significant, and the waters with high water depth are often the areas with concentrated resource density. In May, Larimichthys polyactis contributed most to mantissa and weight, which was the most important dominant species. Miichthys miiuy contributed most to the mantissa of fish, which was also an important dominant species in this season. 9 In the month, Collichthys lucidus contributed most to mantissa and contribution to weight, which was the most important dominant species in September. Compared to other waters in China, the dominant species are almost all of China’s major economic fish off-shore. Therefore, it can be considered that the shallow shoals in northern Jiangsu and the outskirts of Lusi fishery are the spawning grounds and feeding grounds for economic fish, and the shoals in northern Jiangsu are of great significance to the formation of Lusi fishery.