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Open AccessArticle

Assessing the Fish Stock Status in Lake Trichonis: A Hydroacoustic Approach

1
Department of Zoology, School of Biology, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
2
Institute of Hydrobiology, Biology Centre of the Czech Academy of Sciences, 370 05 České Budějovice, Czech Republic
3
Institute for Environmental Studies, Faculty of Science, Charles University, Benátská 2, 128 43 Prague, Czech Republic
*
Author to whom correspondence should be addressed.
Water 2020, 12(6), 1823; https://doi.org/10.3390/w12061823
Received: 13 April 2020 / Revised: 21 June 2020 / Accepted: 23 June 2020 / Published: 25 June 2020
(This article belongs to the Special Issue Ecology and Conservation of Freshwater Fishes Biodiversity)
Fish stock monitoring is an important element for the sustainable management of inland water resources. A scarcity of data and the lack of systematic monitoring for Lake Trichonis precludes an up-to-date assessment. To assess the current status of pelagic fish stock, a hydroacousting survey was conducted for the first time in Lake Trichonis, Greece. In October 2019, the lake was acoustically surveyed with two, horizontally and vertically mounted, 120 kHz transducers during day and night. A decreasing gradient in pelagic fish density from the western to the eastern shores of the lake was observed. Fish density was significantly higher in the intermediate layers of the water column, in the eastern region, compared to the western region. The lake appears to host primarily communities of small-sized fish (TL: 0–5 cm), whereas larger fish (TL: 5–50 cm) are a small minority of the total fish stock. The overall average estimated fish length was approximately 2.4 cm. The adoption of routine inland fish stock monitoring through hydroacoustic methods could be a promising step in the effort to improve the understanding of unique inland water ecosystems with minimum impact on endemic species, as well as to mitigate human impact and achieve long-term sustainable management. View Full-Text
Keywords: acoustics; fish density; fish distribution; Mediterranean lake acoustics; fish density; fish distribution; Mediterranean lake
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Perivolioti, T.-M.; Frouzova, J.; Tušer, M.; Bobori, D. Assessing the Fish Stock Status in Lake Trichonis: A Hydroacoustic Approach. Water 2020, 12, 1823.

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