Calibration of fish biomass estimates from gillnets: Step towards broader application of gillnet data

Říha, Milan; Prchalová, Marie; Brabec, Marek; Draštík, Vladislav; Muška, Milan; Tušer, Michal; Bartoň, Daniel; Blabolil, Petr; Čech, Martin; Frouzová, Jaroslava; Holubová, Michaela; Jůza, Tomáš; Moraes, Karlos Ribeiro de; Rabaneda-Bueno, Rubén; Sajdlová, Zuzana; Souza, A.T.; Šmejkal, Marek; Vašek, Mojmír; Vejřík, Lukáš; Vejříková, Ivana; Peterka, Jiří; Kubečka, Jan

doi:https://dx.doi.org/10.1016/j.ecolind.2023.110425

Number of the records: 1

Calibration of fish biomass estimates from gillnets: Step towards broader application of gillnet data

1.

SYSNO ASEP	0583807
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Calibration of fish biomass estimates from gillnets: Step towards broader application of gillnet data
Author(s)	Říha, Milan (BC-A)_{RID, ORCID} Prchalová, Marie (BC-A)_{RID, ORCID} Brabec, Marek (UIVT-O)_{RID, SAI, ORCID} Draštík, Vladislav (BC-A)_{RID, ORCID} Muška, Milan (BC-A)_{RID, ORCID} Tušer, Michal (BC-A)_{RID, ORCID} Bartoň, Daniel (BC-A)_RID Blabolil, Petr (BC-A)_{RID, ORCID} Čech, Martin (BC-A)_{RID, ORCID} Frouzová, Jaroslava (BC-A)_{RID, ORCID} Holubová, Michaela (BC-A)_{RID, ORCID} Jůza, Tomáš (BC-A)_{RID, ORCID} Moraes, Karlos Ribeiro de (BC-A) Rabaneda-Bueno, Rubén (BC-A)_RID Sajdlová, Zuzana (BC-A)_{RID, ORCID} Souza, A.T. (PT) Šmejkal, Marek (BC-A)_{RID, ORCID} Vašek, Mojmír (BC-A)_{RID, ORCID} Vejřík, Lukáš (BC-A)_{RID, ORCID} Vejříková, Ivana (BC-A)_{RID, ORCID} Peterka, Jiří (BC-A)_{RID, ORCID} Kubečka, Jan (BC-A)_{RID, ORCID}
Number of authors	22
Article number	110425
Source Title	Ecological Indicators. - : Elsevier - ISSN 1470-160X Roč. 153, May (2023)
Number of pages	14 s.
Language	eng - English
Country	NL - Netherlands
Keywords	distribution patterns ; salvelinus-alpinus ; measurement error ; sampling methods ; Hydroacoustics
Subject RIV	EH - Ecology, Behaviour
OECD category	Ecology
Subject RIV - cooperation	Institute of Computer Science - Applied Statistics, Operational Research
R&D Projects	EF16_025/0007417 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
	QK22020134 GA MZe - Ministry of Agriculture (MZe)
Method of publishing	Open access
Institutional support	BC-A - RVO:60077344 ; UIVT-O - RVO:67985807
UT WOS	001013349000001
EID SCOPUS	85160571780
DOI	10.1016/j.ecolind.2023.110425
Annotation	Fish are an important component of aquatic ecosystems, thus representative and reliable assessments of their population variables are essential for a variety of ecological applications, management and conservation. Determining Fish Density per actual Spatial Unit (volume or area, FDSU) as a measure of absolute fish quantity is of particular interest. Gillnets are undoubtedly one of the most common and important methods for assessing fish populations in large lentic waters. However, direct calculating of FDSU from gillnet catches is impossible because of the passive nature of this method, and to date there is no reliable model for calculating FDSU from gillnet catches.This weakness largely limits the use of gillnet data for applications requiring FDSU estimates. The aim of this study was to calibrate gillnet catches using FDSU obtained by active methods (beach seine nets and hydroacoustics) to develop a tool for assessing FDSU from gillnet catches. To achieve this goal, we compared gillnet biomass to fish biomass estimated from the active methods, both of which cover similar spatiotemporal niches. This comparison was performed using a statistical approach based on the recognition of non-negligible random measurement error in both the explanatory (active methods) and response (gillnets) variables.We found a strong positive linear relationship between fish biomasses sampled with gillnets and with active methods. The slope of the fitted linear model was similar when comparing gillnets with the two active methods. The statistical method used allowed for the inclusion of error in the biomass estimates with gillnets and active methods, refining the credible intervals of the estimated relationship. The effect of gillnet effort on model accuracy was simulated to show how increased effort narrows the credible interval. Finally, comparison with previously published relationships revealed a large but explainable discrepancy between our model and previous models.Our study showed that conversion of gillnet biomass to biomass per actual spatial unit is possible. The effective sampling area of one square meter of gillnet was determined to be 8 m2 of waterbody surface area when European standard 12 mesh-sizes gillnets are used, and 5 m2 when four larger meshes are added to the European standard gillnets. Our model further stressed the impact of increased sampling effort on reducing estimation variability and shows that the model may be dependent on the fish community.
Workplace	Biology Centre (since 2006)
Contact	Dana Hypšová, eje@eje.cz, Tel.: 387 775 214
Year of Publishing	2024
Electronic address	https://doi.org/10.1016/j.ecolind.2023.110425

Number of the records: 1