Comparing hydroacoustic fish stock estimates in the pelagic zone of temperate deep lakes using three sound frequencies (70, 120, 200 kHz)

Guillard, Jean; Lebourges-Daussy, Anne; Balk, Helge; Colon, Michel; Jóźwik, A.; Godlewska, M.

doi:10.5268/iw-4.4.733

Cited by 22 publications

(48 citation statements)

References 38 publications

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“…; Guillard et al. ). The Elementary Distance Sampling Unit (EDSU) was set to 250 m (same as applied by Guillard et al.…”

Section: Methodsmentioning

confidence: 96%

“…; CEN, ; Guillard et al. ). The threshold of the mean volume backscattering strength, S v (f) (in dB re 1 m −1 , noted dB), was set 6 dB lower at −66 dB according to Parker‐Stetter et al.…”

Section: Methodsmentioning

confidence: 99%

“…The Elementary Distance Sampling Unit (EDSU) was set to 250 m (same as applied by Guillard et al. ) to extract the area backscattering coefficient, s A (f) (MacLennan et al. ) and Target Strength (TS(f)) separately in each layer.…”

Section: Methodsmentioning

confidence: 99%

“…Previous studies have highlighted the similarities between 70 and 120 kHz results, while 200 kHz results differed when fish densities were high, or more than 600 fish.ha −1 (Guillard et al. ).…”

Section: Introductionmentioning

confidence: 92%

“…); however, some standardisations and intercalibrations are still necessary (Guillard et al. ). The Study Group on Fisheries Acoustics in the Great Lakes conducted studies to improve the standardisation of operating procedures (Rudstam et al.…”

Section: Introductionmentioning

confidence: 99%

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

Mouget

Goulon

Axenrot

et al. 2019

Remote Sens Ecol Conserv

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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.

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“…; Guillard et al. ). The Elementary Distance Sampling Unit (EDSU) was set to 250 m (same as applied by Guillard et al.…”

Section: Methodsmentioning

confidence: 96%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Mouget

Goulon

Axenrot

et al. 2019

Remote Sens Ecol Conserv

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Fish hydroacoustic survey standardization: A step forward based on comparisons of methods and systems from vertical surveys of a large deep lake

Draštík

Godlewska

Balk

et al. 2017

Limnology & Ocean Methods

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Hydroacoustic methods are routinely used for fish population assessment and monitoring in lakes and reservoirs around the world and are particularly embedded in European and North American lake management. However, the comparability of hydroacoustic results can be difficult to assess due to the large number of variables (sound frequency, sound pulse duration, system manufacturer, analysis method, etc.) that can influence acoustic estimates. This study investigates the effect of variations in analysis method and hydroacoustic system on commonly produced outputs. Volume backscattering strength (Sv), mean target strength (TS), fish abundance, and biomass were estimated using two analysis methods (echo integration and track‐counting) using data recorded from a large, deep lake (Windermere, UK) by four vertically oriented split‐beam systems operating at three sound frequencies (120 kHz, 200 kHz, and 400 kHz). The two analysis methods used produced similar estimates of fish abundance and fish biomass. We therefore concluded that echo integration and track‐counting can be robustly used and outputs justifiably compared under the conditions of the Windermere surveys. In addition, we compared mean Sv, mean TS, fish abundance, and biomass estimates across the four hydroacoustic systems. The only significant result was for abundance estimates, however, the system made a small contribution to the overall variability. All four systems provided similar results for the other metrics, demonstrating that independent hydroacoustic surveys operating within the European Standard can make a major contribution to the assessment and monitoring of fish populations in deep lakes and reservoirs.

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Hydroacoustic Autonomous boat for Remote fish detection in LakE (HARLE), an unmanned autonomous surface vehicle to monitor fish populations in lakes

Goulon

Meaux

Vincent‐Falquet

et al. 2021

Limnology & Ocean Methods

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To evaluate the aquatic ecosystem's quality and ensure the sustainable management of fisheries, it is important to monitor fish populations. Hydroacoustics uses sound waves to noninvasively scan and gather information on waterbodies including fish abundance and distribution. Unmanned surface vehicles (USV) have been increasingly used in marine and freshwater environments to enable data collection. We provide a detailed description of a new USV called Hydroacoustic Autonomous boat for Remote fish detection in LakE (HARLE), which is devoted to hydroacoustic studies in freshwater. The USV is electrically powered and equipped with the most modern fishery scientific echosounder, suitable for broadband applications, the EK80 (SIMRAD). The USV was used for a conventional hydroacoustic survey in a peri-alpine lake to investigate its potential to monitor fish populations in lakes. In the lower layer of the lake where there were numerous targets and comparisons were possible, hydroacoustic metrics and fish biomass values (kg ha −1 ) from the SIMRAD EK80 on board the USV and EK60 on board the research vessel were similar. We showed that the HARLE has great potential to be used as a tool for fish monitoring and hydroacoustic survey in freshwater.

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Comparing hydroacoustic fish stock estimates in the pelagic zone of temperate deep lakes using three sound frequencies (70, 120, 200 kHz)

Cited by 22 publications

References 38 publications

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

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

Fish hydroacoustic survey standardization: A step forward based on comparisons of methods and systems from vertical surveys of a large deep lake

Hydroacoustic Autonomous boat for Remote fish detection in LakE (HARLE), an unmanned autonomous surface vehicle to monitor fish populations in lakes

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