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为阐明南海柘林湾鱼类群落结构的动态变化,基于2011年4月(春季)、8月(夏季)、11月(秋季)和2012年2月(冬季)对南海柘林湾拖网调查的数据,对柘林湾鱼类群落结构季节动态、鱼类营养级指数季节变化进行了初步分析。结果显示,各季节调查共捕获鱼类99种,底层鱼类占49.49%,暖水性鱼类占78.78%,肉食性鱼类占79.79%。各季节质量百分比和数量百分比优势种以拟矛尾■虎鱼(Parachaeturichthys polynema)、龙头鱼(Harpodon nehereus)、皮氏叫姑鱼(Johnius belengeri)等为主。柘林湾鱼类资源密度和资源尾数密度最高季节为夏季,各季节鱼类个体体质量大多小于15 g。春、秋季鱼类组成相对丰富,冬季生物量优势度最高。柘林湾鱼类以中级肉食性和高级肉食性为主,年度平均营养级指数为3.478,属于中级水平,夏季高营养级鱼类平均体质量最高。
In order to clarify the dynamic changes of fish community structure in Zhelin Bay of the South China Sea, based on the investigation of the trawl net in the Yellow Sea Bay of the South China Sea in April 2011 (spring), August (summer), November (autumn) and February 2012 Data were used to analyze the seasonal dynamics of fish community structure and the seasonal changes of fish trophic level index in Zhelin Bay. The results showed that 99 species of fish, 49.49% of bottom fish, 78.78% of warm-water fish and 79.79% of carnivorous fish were caught in each season. The dominant species in each season were the species of Parachaeturichthys polynema, Harpodon nehereus, Johnius belengeri and so on. The highest season of fish resource density and mantissa density in Zhelin Bay is summer, and the body mass of fish in each season is mostly less than 15 g. The composition of fish in spring and autumn is relatively rich, with the highest biomass in winter. The fish belonged to mid-level carnivore and carnivore. The annual average trophic level index was 3.478, belonging to the intermediate level. The average trophic level of fish in summer was the highest.