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首页> 外文期刊>Fisheries Research >Observation of fish migration between the sea and a Mediterranean lagoon(Etang de l'Or, France) using multibeam sonar and split beam echo sounder
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Observation of fish migration between the sea and a Mediterranean lagoon(Etang de l'Or, France) using multibeam sonar and split beam echo sounder

机译：使用多束声纳和分束式回声测深仪观察鱼类在海洋和地中海泻湖之间的迁移（Etang de l'Or，法国）

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The aim of this paper is to describe the application and results of a new methodology for studying the fish distribution, abundance and amphidromous migration in very shallow waters, taking a Mediterranean lagoon as an example. The study is the 'Etang de 1'Or' (France). The study was conducted in the main channel connecting the lagoon to the sea (1.5 km long, 12 m wide and 1.5 m deep). Two surveys were achieved, in May and October 1995. The equipment consisted of a split-beam echo sounder (120 kHz) used horizontally and a multibeam sonar (60 beams, 1.5 degrees each, 455 kHz), both used from the shore, aimed perpendicularly to the channel axis. It allowed us to obtain TS distributions, abundance indices (including fish school evaluation) and the direction of fish migration (fish tracking). The sonar was directed on a vertical plan to evaluate the actual number of fish schools crossing the channel and to make behavioural observations. Echo soundings were processed by direct measurement on the echogram for school geometry and through EP500 SIMRAD software for echo integration, TS measurements and fish tracking. The sonar data were recorded on video tape and processed by eye in the laboratory (school counting). During the surveys, individual targets did not show significant migration, while fish schools were clearly migrating towards the lagoon in October. During this survey the mean density was evaluated at 7 g m(-3), and the total biomass entering the lagoon at 1.4 tons/day. No relation between current flow and fish movements was observed. The paper demonstrates that multibeam sonar with split-beam echo sounder used horizontally may overcome several serious limitations on the application of acoustics in shallow water.
机译：本文的目的是描述一种新方法的应用和结果，该方法用于研究极浅水域中鱼类的分布，丰度和两栖类迁徙，以地中海泻湖为例。该研究是“ Etang de 1'Or”（法国）。这项研究是在连接泻湖和大海的主要水道中进行的（长1.5公里，宽12 m，深1.5 m）。 1995年5月和10月进行了两次测量。该设备包括水平使用的分束式回声测深仪（120 kHz）和多光束声纳（60束，每束1.5度，455 kHz），均对准岸边。垂直于通道轴。它使我们能够获得TS分布，丰度指数（包括鱼群评估）和鱼迁移的方向（鱼的追踪）。声纳是根据一个垂直计划进行的，以评估越过水道的鱼群的实际数量并进行行为观察。回波测深通过对回波图进行直接测量来确定学校的几何形状，并通过EP500 SIMRAD软件进行回波积分，TS测量和鱼的追踪处理。将声纳数据记录在录像带上，并在实验室中用肉眼进行处理（学校计数）。在调查期间，个别目标并未显示出明显的迁徙，而鱼类学校显然在10月正向泻湖迁徙。在此调查期间，评估的平均密度为7 g m（-3），进入泻湖的总生物量为1.4吨/天。没有观察到电流与鱼类运动之间的关系。本文证明，水平使用分束回声测深仪的多波束声纳可以克服浅水声学应用中的几个严重限制。

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