Less effort but equal result: Introducing the daily run-size estimation method for quantifying fish passage in fishways.

Determining the number of fish that use a fishway is essential to fisheries management but counting all fish can be impracticable due to labor and cost. We present the daily run-size estimation (DARSE) method, which uses systematic sampling to estimate the number of fish per species that pass throug...

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Autores principales:	Mariana O Côrtes, Alexandre Peressin, Alexandre L Godinho
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/1defca909b5d4306b478a6d1e887f217
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spelling	oai:doaj.org-article:1defca909b5d4306b478a6d1e887f2172021-12-02T20:05:30ZLess effort but equal result: Introducing the daily run-size estimation method for quantifying fish passage in fishways.1932-620310.1371/journal.pone.0252183https://doaj.org/article/1defca909b5d4306b478a6d1e887f2172021-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0252183https://doaj.org/toc/1932-6203Determining the number of fish that use a fishway is essential to fisheries management but counting all fish can be impracticable due to labor and cost. We present the daily run-size estimation (DARSE) method, which uses systematic sampling to estimate the number of fish per species that pass through a fishway daily (daily run size, D). The DARSE method makes it possible to determine the minimum fraction of each hour (or hourly samples) of the day necessary to estimate D with known accuracy. We apply DARSE to each of the seven most abundant fish species (other species grouped under 'Others') recorded in video images taken during 46 days of one year at the Igarapava Fish Ladder, Brazil. Accuracy in estimating D was influenced by the fraction of the hour sampled and the temporal pattern of fish passage through the fishway. For species with a more uniform temporal pattern of passage, the DARSE method reduced the time spent on sampling by up to 96%, depending on the accuracy used to estimate D. Some of these species required counts of fish that pass in a fraction of an hour for all hours of the day while counts for other species can be done every 2 hours or, more rarely, every 3 hours. For species with a more aggregated temporal pattern of passage, it was possible to estimate D by sampling a fraction of an hour but with reduced accuracy in the estimation of D and little reduction in sampling time.Mariana O CôrtesAlexandre PeressinAlexandre L GodinhoPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 16, Iss 5, p e0252183 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Mariana O Côrtes Alexandre Peressin Alexandre L Godinho Less effort but equal result: Introducing the daily run-size estimation method for quantifying fish passage in fishways.
description	Determining the number of fish that use a fishway is essential to fisheries management but counting all fish can be impracticable due to labor and cost. We present the daily run-size estimation (DARSE) method, which uses systematic sampling to estimate the number of fish per species that pass through a fishway daily (daily run size, D). The DARSE method makes it possible to determine the minimum fraction of each hour (or hourly samples) of the day necessary to estimate D with known accuracy. We apply DARSE to each of the seven most abundant fish species (other species grouped under 'Others') recorded in video images taken during 46 days of one year at the Igarapava Fish Ladder, Brazil. Accuracy in estimating D was influenced by the fraction of the hour sampled and the temporal pattern of fish passage through the fishway. For species with a more uniform temporal pattern of passage, the DARSE method reduced the time spent on sampling by up to 96%, depending on the accuracy used to estimate D. Some of these species required counts of fish that pass in a fraction of an hour for all hours of the day while counts for other species can be done every 2 hours or, more rarely, every 3 hours. For species with a more aggregated temporal pattern of passage, it was possible to estimate D by sampling a fraction of an hour but with reduced accuracy in the estimation of D and little reduction in sampling time.
format	article
author	Mariana O Côrtes Alexandre Peressin Alexandre L Godinho
author_facet	Mariana O Côrtes Alexandre Peressin Alexandre L Godinho
author_sort	Mariana O Côrtes
title	Less effort but equal result: Introducing the daily run-size estimation method for quantifying fish passage in fishways.
title_short	Less effort but equal result: Introducing the daily run-size estimation method for quantifying fish passage in fishways.
title_full	Less effort but equal result: Introducing the daily run-size estimation method for quantifying fish passage in fishways.
title_fullStr	Less effort but equal result: Introducing the daily run-size estimation method for quantifying fish passage in fishways.
title_full_unstemmed	Less effort but equal result: Introducing the daily run-size estimation method for quantifying fish passage in fishways.
title_sort	less effort but equal result: introducing the daily run-size estimation method for quantifying fish passage in fishways.
publisher	Public Library of Science (PLoS)
publishDate	2021
url	https://doaj.org/article/1defca909b5d4306b478a6d1e887f217
work_keys_str_mv	AT marianaocortes lesseffortbutequalresultintroducingthedailyrunsizeestimationmethodforquantifyingfishpassageinfishways AT alexandreperessin lesseffortbutequalresultintroducingthedailyrunsizeestimationmethodforquantifyingfishpassageinfishways AT alexandrelgodinho lesseffortbutequalresultintroducingthedailyrunsizeestimationmethodforquantifyingfishpassageinfishways
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Less effort but equal result: Introducing the daily run-size estimation method for quantifying fish passage in fishways.

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