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首页> 外文会议>IEEE/OES Acoustics in Underwater Geosciences Symposium >Aggregative and schooling behaviour of small pelagic fish schools through echo type characteristics
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Aggregative and schooling behaviour of small pelagic fish schools through echo type characteristics

机译：通过回声型特征的小型川菜学校的聚合和教育行为

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In this work we compare the result obtained by in situ echosounder measurements on eastern Venezuelan and south S??n??gal coastal shelves where Sardinella aurita was the predominant species occurred in fish school structure. The both stocks are known as genetically independent. Persistent school typology was already described by Petitgas and Levenez (1996) analysing Senegalese echogram database. We compiled and analyzed an acoustic database (7 surveys) of Venezuelan fish school populations. The echo type typology encountered in the both countries is similar over the year. On the others hand, two standardized acoustics surveys have been carried out in 1999, with the same research vessel and echosounder (38 kHz) in S??n??gal and Venezuela. The `echointegration by shoal?? method was performed on the data collected on both stocks. The observed fish school descriptors (energetic, morphologic and spatial) showed that the differentiation between day and night fish schools was mainly due to morphologic variables (fractal dimension). In Venezuela the echo types were different between day and night as in S??n??gal, but on the entire diel cycle the quantitative and qualitative characteristics of fish schools were similar on both ecosystems. Both acoustic fish school populations are similar; they are constituted by a same dominant species Sardinella aurita. Observation of small pelagic fish school during the night is not unusual. The schooling behaviour and the diel aggregative dynamics of small pelagic fish around the world are discussed according our result and literature review. School morphology appears to be common to large number of species, and aggregative dynamics, species dependent.
机译：在这项工作中，我们比较了在东委内瑞拉和南部的原位回声管测量中获得的结果，萨鲁塔岛的Gal沿海架子是鱼类学校结构的主要物种。两股股票被称为遗传独立。 Petitgas和Levenez（1996）已经描述了持久的学校类型学，分析了塞内加尔斯呼链图数据库。我们编制并分析了委内瑞拉鱼学校人口的声学数据库（7调查）。两国遇到的回声类型类型在一年中相似。在其他人的手中，1999年进行了两种标准化的声学调查，在S ?? Gal和委内瑞拉的同一研究船和echosounder（38 kHz）。 shoal的'echodegration ??对两种股票收集的数据进行了方法。观察到的鱼类学校描述符（精力充沛，形态学和空间）表明，白天和夜鱼之间的差异主要是由于形态学变量（分形维数）。在委内瑞拉，回声类型在白天和夜间之间存在不同，如在S ?? Gal，但在整个Diel循环上，鱼类学校的定量和定性特征在两种生态系统上都是相似的。两个声学鱼类学校人口都是相似的;它们由一个相同的优势物种Sardinella Aurita构成。在夜间观察小型鱼类学校并不罕见。根据我们的结果和文献综述，讨论了世界各地小型皮鱼的教育行为和DIEL聚合动态。学校的形态似乎是大量物种和聚合动力学，物种依赖的常见。

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