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Including 38 kHz in the standardization protocol for hydroacoustic fish surveys in temperate lakes

Mouget, Anne and Goulon, Chloe and Axenrot, Thomas and Balk, Helge and Lebourges-Dhaussy, Anne and Godlewska, Malgorzata and Guillard, Jean (2019). Including 38 kHz in the standardization protocol for hydroacoustic fish surveys in temperate lakes. Remote sensing in ecology and conservation. 5 , 332-345
[Journal article]

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Abstract

Hydroacoustics has become a requisite method to assess fish populations and allows to describe the relationships of fish with other elements of the aquatic ecosystem. This nonintrusive method is currently an integral part of the sampling procedures recommended for fish stock assessment by the Water Framework Directive and has been standardized by the European Committee for Standardization [CEN (2014) CSN EN 15910 - Water quality - Guidance on the estimation of fish abundance with mobile hydroacoustic methods, Category: 7577 Water quality. Biological.]. In Europe, hydroacoustic surveys are performed in freshwater using different frequencies. Consequently, there is a need to evaluate if survey results can be compared. This study aimed to carry out in situ comparisons at the 38 kHz frequency (noted f) with two other commonly used frequencies, 70 and 200 kHz. The 38 kHz frequency has seldom been compared with other frequencies in freshwater although it is widely used worldwide, especially in the Great Lakes of North America and in Sweden. In 2016, hydroacoustic data were acquired in Lakes Annecy and Bourget using methods validated in previous studies that compared the frequencies 70, 120 and 200 kHz. This study showed similar density and biomass estimations as a function of frequency, density(f) and biomass(f), between the frequencies studied for low to moderate fish densities. For higher fish densities, the results were more variable and need to be verified. Fish density(f) and biomass(f) estimations sometimes exhibit differences between frequencies, which is not fully in agreement with theoretical calculations. The aim of this study was to evaluate frequency comparisons in practise. However, if the differences on acoustic metrics, density(f) or biomass(f) between frequencies were occasionally statistically significant, the differences were small enough to be considered negligible for fish population management. These analyses led to better knowledge of the responses from fish in temperate lakes for the studied frequencies. Our findings should be considered when revising the CEN standard.

Authors/Creators:Mouget, Anne and Goulon, Chloe and Axenrot, Thomas and Balk, Helge and Lebourges-Dhaussy, Anne and Godlewska, Malgorzata and Guillard, Jean
Title:Including 38 kHz in the standardization protocol for hydroacoustic fish surveys in temperate lakes
Series Name/Journal:Remote sensing in ecology and conservation
Year of publishing :2019
Volume:5
Page range:332-345
Number of Pages:14
Publisher:WILEY
ISSN:2056-3485
Language:English
Publication Type:Journal article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution-Noncommercial 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Fish and Aquacultural Science
Keywords:Fisheries acoustics, frequencies comparison, freshwater, hydroacoustics, lake, standardization
URN:NBN:urn:nbn:se:slu:epsilon-p-109239
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-109239
Additional ID:
Type of IDID
DOI10.1002/rse2.112
Web of Science (WoS)000587566900004
ID Code:19743
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Department of Aquatic Resources
Deposited By: SLUpub Connector
Deposited On:18 Dec 2020 15:43
Metadata Last Modified:18 Dec 2020 15:51

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