大亚湾鱼卵数量分布及种类组成特征

Distribution and species composition of fish eggs in Daya Bay

根据2003-2005年大亚湾8个航次鱼卵调查数据,分析大亚湾鱼卵数量和种类组成的年间变化和季节变化。结果表明,大亚湾鱼卵数量具有较大的年间波动和显著的季节变化,鱼卵数量高峰期出现在5-9月,以9月为最高峰。鱼卵数量的空间分布极不均匀,且季节变化明显。鱼卵全年以鲾科(Leiognathidae)、小沙丁鱼(Sardinells sp).、小公鱼(Stolephorus sp).、舌鳎科(Synoglossidae)、斑(Clupanodon punctatus)、褐菖鲉(Sebastiscus marmoratus)和鲷科(Sparidae)鱼类占优势,其鱼卵数量在2003-2004年占总数的90.6%,2004-2005年占总数的90.7%。其中,尤以鲾科鱼卵所占比例最大,在2003-2004年春、夏、秋季分别占总数的71.7%、73.1%和86.0%,冬季则以斑、褐菖鲉和鲷科鱼类占绝对优势。大亚湾鱼卵的数量变动与鱼类种群结构变化有关,空间分布与海流及浮游动物的分布有关。

Based on the data of eight seasonal surveys during 2003-2005 in Daya Bay,annual and seasonal quantity variation and species composition of fish eggs were analysed.The survey results showed that fish egg quantity had marked annual and seasonal variation.Fish egg quantity was large from May to September,and the peak appeared in September.Spatial distribution of egg quantity was distinctly uneven and varied seasonally.Dominant species of eggs were Leiognathidae,Sardinells sp.,Stolephorus sp.,Synoglossidae,Clupanodon punctatus,Sebastiscus marmoratu and Sparidae in the whole year.The egg quantity of these species accounted for 90.6%of the total eggs in 2003-2004 and 90.7%in 2004-2005·Leiognathidae was the most dominant species in spring,summer and autumn with its egg quantity accounting for 71.7%,73.1%and 86.0%in the three seasons in 2003-2004.Clupanodon punctatus, Sebastiscus marmoratus and Sparidae dominated absolutely in winter.Quantity variation of fish eggs was related to the variation of fish stock composition,and its spatial distribution was affected by sea current and zooplankton distribution.