By I.L. Kalikhman
Previously, there has now not been any paintings that systematically offers the topic of acoustic fish reconnaissance, information all significant points of utilising acoustic apparatus in advertisement fish reconnaissance, and provides enough research of the effectiveness of fish-finding ideas. Acoustic Fish Reconnaissance responds to this want by means of delivering the 1st assessment of the theoretical and sensible facets of acoustic seek, detection, interpretation, and inhabitants estimation for advertisement benefit.This publication will pay specific consciousness to the idea and perform of accounting surveys for quantitative estimation of organic assets and fishing stipulations in conventional fishing components. It additionally analyzes quite a few purposes of acoustic method, dependent upon the authors' wide investigations. The textual content contains the result of the applicability of fish-finding tools, and provides tips about the advance of superior acoustic suggestions for advertisement fleets.
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Extra info for Acoustic Fish Reconnaissance (Marine Science)
In contrast to echo sounders, required ranges of sonar are determined not only by the demands of detection, but also by the necessity to aim the fishing gear reliably at commercial items. For this purpose, sonars with circular and wide sector views are used. Having great functional possibilities, these sonars are designed, first of all, to ensure aimed fisheries; their range does not usually exceed 1500–2000 m. Side scanning sonar are also used; their range can exceed 3000 m and more. 1. These data result from generalizing practical experience with consideration given to analysis of the peculiarities of the distribution of various items within different regions and the capabilities of fisheries vessels.
30) As follows from this simple relation, the admissible minimal intensity of useful signals depends on the level of acoustic noises and the coefﬁcient of recognition. Reducing the level of noise of a vessel is usually achieved by its suppression where it is being generated. It is also possible to reduce the level of noises through the narrowing of the frequency band of a receiver or the use of a narrow-beam transducer. Lowering of the coefﬁcient of recognition with reverberation noises is achieved by using correlation methods for treating signals in receiver systems.
3). The results of calculations show that with registering the concentration by an EK60 instrument, the limiting values can differ by several orders. Therefore, the character of echo signals from concentrations may vary over great ranges depending on the parameters of the acoustic instrument. 15. The graph presents the dependence of the number of impulses in an impulse volume upon distance, calculated for registration of sufﬁcient dense concentration by an EK60. The limiting values of the number of ﬁsh for each type of echo signal are marked.
Acoustic Fish Reconnaissance (Marine Science) by I.L. Kalikhman