... With the development of telemetry, it has become common to use remote measuring devices to obtain information. A transmitter and receiver are attached to the head rope of a bottom trawl net to learn the height of the net mouth, the fish entering the net, and the distance from the bottom (net recorder), to check the sinking state of the bottom of a purse seine net (net sonde), and to monitor the fish entering a fixed net from land and efficiently haul it up (telesounder). Fish finders that are effective for various targets such as dense schools (pelagic fish, bottom fish), individual fish (tuna, etc.), and plankton (whitebait, cherry shrimp, etc.) have been developed, and since the strength of the reflection varies depending on the fish, a color fish finder that displays a color in proportion to the strength of the reflected signal has also been developed. However, the basic structure of the transmitter-transmitter-amplifier-recorder has not changed. ... *Some of the terms that refer to "color fish finder" are explained below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
… テレメトリー(遠隔測定法)の発達に伴い,離れたところで働かせて情報をとることも盛んになり,底引網のヘッドロープに送受信器をつけて,網口の高さ,魚の入網状況,離底距離などを船上で知ったり(ネットレコーダー),巻網の網裾の沈降状況を確認したり(ネットゾンデ),定置網の魚群の入網状況を陸上で監視し,効率的に揚網を行う(テレサウンダー)などにも用いられている。 密集群(浮魚,底魚),単体(マグロなど),プランクトン(シラス,サクラエビなど)などいろいろの対象に対して有効な魚探が開発されており,魚によって反射の強さが異なることから,反射信号の強さに比例して,カラー表示をするカラー魚探もできている。ただ,基本的な構成は発信器―送受波器―増幅器―記録器から成り,変わっていない。… ※「カラー魚探」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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