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- Title
Efficiency of the Sonar Fish Protection Device at the Kokaral Dam of the Small Aral Sea.
- Authors
Sharakhmetov, S. Е.; Barakbayev, T. R.; Adayev, T. O.
- Abstract
The study aimed to assess the efficiency of the pilot sonar (hydroacoustic) fish protection device (FPD) installed at the Kokaral Dam of the Small Aral Sea. For this purpose, between August 27 and September 5, 2020 experimental and control fish catching was carried out using fixed fishing nets (30x60 mm mesh). The FPD's effectiveness was assessed based on the amount and species diversity of the caught fish with and without the FPD operating. Fish behavior and distribution were monitored using an echo sounder. In terms of quantity, the total of 173 fish were caught with the FPD off, and 94 with the FPD on. In terms of biomass, the values were 37.5 kg and 27.6 kg, respectively. With the FPD off, the ichthyofauna composition was represented by 12 fish species: common carp, crucian carp, roach, ide, bream, rudd, saber carp, snakehead, pikeperch, perch, pike, and asp. With the FPD on, roach and ide were absent in the catch, and the quantity of rudd significantly decreased. In both catches, the quantity of common carp and crucian carp was similar; bream and saber carp specimens were sporadic. The number of predatory fish (pike, perch, snakeheads, and pikeperch) in the catches increased. Asp was absent in the net catches also; however, this fish species represents the main object of amateur hook and line fishing. Based on the catch-per-effort unit, it can be concluded that whereas the FPD demonstrated efficiency - for small non-predatory fish like ide, roach, and rudd it was 95%, it was 0% for large non-predatory fish (carp and crucian carp); and negative for predatory fish.
- Subjects
ARAL Sea (Uzbekistan &; Kazakhstan); FISH conservation; SONAR in fishing; UNDERWATER acoustics; FISH management areas; FISH diversity
- Publication
Central Asian Journal of Water Research, 2021, Vol 7, Issue 1, p158
- ISSN
2522-9060
- Publication type
Article
- DOI
10.29258/CAJWR/2021-R1.v7-1/158-176.eng