南海中部海域鸢乌贼耳石形态特征分析

Statolith morphology of purpleback flying squid Sthenoeuthis oualaniensis in the central South China Sea

根据2012年9月～10月于南海中部海域采集的鸢乌贼（Sthenoteuthis oualaniensis）样本90尾,对其耳石形态特征及计量学参数进行了初步研究。结果表明,耳石样本具有明显的背区、侧区、吻区和翼区结构,背区小,侧区和翼区宽大,吻区长窄。南海中部海域鸢乌贼按照耳石形态的差异可分为3个不同的群体。耳石总长（total statolith length,TSL）、翼区长（wing width,WL）、最大宽（maximum width,MW）与胴长之间呈对数函数关系（P〈0.05）,吻区长（rostrum length,RSL）、背侧区长（dorsolateral length,DLL）与胴长之间呈线性函数关系（P〈0.05）。随着胴长的增加,耳石绝对尺寸逐渐增大,相对尺寸逐渐减小,耳石的形态结构比例基本不变,即背侧区长、侧区长、吻区长、翼区长同耳石总长之比基本保持一致,分别为48.05%、60.05%、35.44%和67.59%,其中侧区长、翼区长与耳石总长的比值随胴长增大而增加的趋势较为明显。

We studied the morphology,microstructure and demographic parameters of statolith of Sthenoeuthis oualaniensis from 90 in-dividuals captured in the central South China Sea during September to October,2012. The morphologic results show that the statolith had great lateral dome and wing dome,small dorsal dome and long narrow rostrum dome. S. oualaniensis in the central South China Sea could be devided into three populations according to their statolith morphology. The total statolith length（ TSL）,wing length （WL）,maximum width（MW）were logarithmically related to the mental length（ML）（P ﹤ 0. 05）;while the rostrum length（RSL） and dorsolateral length（DLL）were linearly related to the ML（P ﹤ 0. 05）. The absolute size and relative size of statolith gradually in-creased and decreased with increasing ML,respectively. The ratios of DLL,LDL,RSL and WL to TSL almost remained the same, being 48. 05% ,60. 05% ,35. 44% and 67. 59% ,respectively;and the ratios of LDL and WL to TSL were relatively higher.