闽南-台湾浅滩渔场蓝圆鲹和鲐鱼群聚空间分布的研究

根据闽南-台湾浅滩渔场灯光围网信息船1990～2002年的渔捞记录，研究该渔场蓝圆鲹和鲐鱼群聚空间分布．结果表明，中上层鱼类蓝圆鲹和鲐鱼年间数量变动具有时间同步的特征，年均网次产量显著相关．蓝圆鲹与鲐鱼群聚区分布差异表现在：蓝圆鲹分布的海区水深较鲐鱼浅，蓝圆鲹和鲐鱼分布渔区的水深，春季分别为40～660m和40～70m，夏季分别为30～50m和30～60m，秋、冬季分别为30～60m和40～60m；鲐鱼的群聚区分布较偏北、偏向台湾岛西岸，蓝圆鲹的群聚区分布较偏南、偏向台湾海峡的中心区域；蓝圆鲹与鲐鱼群聚区的时空隔离、彼此取代比较明显．蓝圆鲹与鲐鱼的群聚区存在一定的重叠，与其种间对食物的竞争有关．两鱼种所出现两种适应性趋向。增加了它们在同一生境中长期共存的可能性．

Studies on spatial distribution of round scad and common mackerel communities in Minnan-Taiwan Bank fishing ground

According to the fishing record from the light-seine information vessel in Minnan-Taiwan Bank fishing ground during 1990 to 2002, the in time and space distribution of Decapterus maruadsi and Pneumatophorus japonicus was studied. The results showed that the quantitative variations of Decapterus maruadsi and Pneuraatophorus japonicus was synchronized in years, and was obviously correlated with the per haul production; the difference was that Decapterus maruadsi was located lower in depth than Pneumatophorus japonicus with 40 to 60m and 40 to 70m in spring, 30 to 50m and 30 to 60m in summer, 30 to 60m and 40 to 60m in autumn and winter, respectively. Pneumatophorus japonicus distributed much north and in Taiwan waters, and Decapterus maruadsi, much south and in the center of Taiwan Strait. The time and space distribution may be substituted each other, the overlaped area was same for Decapterus maruadsi and Pneumatophorus japonicus that related with food competition. The adjustable tendency increased the possibility for the species living in the same sea area.