By I.L. Kalikhman
Previously, there has now not been any paintings that systematically offers the topic of acoustic fish reconnaissance, info all significant facets of utilising acoustic gear in advertisement fish reconnaissance, and provides enough research of the effectiveness of fish-finding innovations. Acoustic Fish Reconnaissance responds to this desire via supplying the 1st assessment of the theoretical and sensible points 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 parts. It additionally analyzes a variety of purposes of acoustic strategy, dependent upon the authors' broad investigations. The textual content comprises the result of the applicability of fish-finding tools, and gives tips about the improvement of enhanced acoustic options for advertisement fleets.
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Extra info for Acoustic Fish Reconnaissance (Marine Science)
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. Estimating the detection range of an acoustic instrument is made with respect to a specific standard target. 1 m is considered as such standard for an echo sounder. This target corresponds, in a reflectivity, to a commercial fish of about 50 cm long. Orienting towards detection of single targets when vertical location is explained by the fact that echo sounders must ensure the search of not only dense concentrations, but also the registration of individual specimens.
The cited methods of suppressing disturbances allow for decreasing the level of noises and, thus, increasing the efﬁciency of the work of acoustic instruments. However, the mentioned measures may not sufﬁce to ensure reliable detection of echo signals from commercial items, especially at great depths. In analyzing the possibilities of lowering the coefﬁcient of recognition, it is necessary to take into account that both useful and noisy signals are ﬂuctuating by nature. 31) where I is the average intensity of signals.
REFERENCES 1. I. , The Charles Stark Draper Laboratory, Cambridge, MA, 53, 1981. 2. B. , The Application of Hydroacoustical Methods for Aquatic Biomass Measurements, The Charles Stark Draper Laboratory, Cambridge, MA, 60, 1971. 3. N. , Fisheries Acoustics, Chapman & Hall, London, 325, 1992. 4. , Treatise on the Theory of Sound, Macmillan, London, 1877. 5. , The Theory of Sound, Vols. 1 and 2, Dover, New York, 1945. 6. , Dorsal-aspect target strength of an individual ﬁsh, Journal of the Acoustical Society of America, 49(3), 816, 1971.
Acoustic Fish Reconnaissance (Marine Science) by I.L. Kalikhman