Comparing on site human and video counts at Igarapava fish ladder, south eastern Brazil
Autor(a) principal: | |
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Data de Publicação: | 2006 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Neotropical ichthyology (Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252006000200017 |
Resumo: | On site human observations and video images were collected and compared at the window of the Igarapava Dam fish ladder (IDFL), rio Grande , Southeastern Brazil, between March 1st and June 30th, 2004. We conducted four experiments with two humans (Observer 1 and Observer 2) observing fish passage in the IDFL window while a Sony 3CCD video camera (Observer 3) recorded fish passage at the same time. Experiments, each one hour in length, were distributed throughout the diel cycle using full spectrum lights. We identified fish species, the number of individuals for each species, and the real time that they passed. Counts from each human observer were compared to the video counts. The fish species most commonly observed in the window were - curimba (Prochilodus lineatus), mandi-amarelo (Pimelodus maculatus), piau-três-pintas (Leporinus friderici) and ferreirinha (Leporinus octofasciatus). The number of species and individuals were indistinguishable for the three observers. But, the number of species and individuals were significantly different among experiments. Thus, the three observers register the same number of species and count the same number of individuals even when these two response variables differ significantly among experiments. Based on these results, we concluded that the video count was an accurate method to assess fish passage at the IDFL. |
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Comparing on site human and video counts at Igarapava fish ladder, south eastern BrazilFish ladderOn-site human countsVideo image countsOn site human observations and video images were collected and compared at the window of the Igarapava Dam fish ladder (IDFL), rio Grande , Southeastern Brazil, between March 1st and June 30th, 2004. We conducted four experiments with two humans (Observer 1 and Observer 2) observing fish passage in the IDFL window while a Sony 3CCD video camera (Observer 3) recorded fish passage at the same time. Experiments, each one hour in length, were distributed throughout the diel cycle using full spectrum lights. We identified fish species, the number of individuals for each species, and the real time that they passed. Counts from each human observer were compared to the video counts. The fish species most commonly observed in the window were - curimba (Prochilodus lineatus), mandi-amarelo (Pimelodus maculatus), piau-três-pintas (Leporinus friderici) and ferreirinha (Leporinus octofasciatus). The number of species and individuals were indistinguishable for the three observers. But, the number of species and individuals were significantly different among experiments. Thus, the three observers register the same number of species and count the same number of individuals even when these two response variables differ significantly among experiments. Based on these results, we concluded that the video count was an accurate method to assess fish passage at the IDFL.Sociedade Brasileira de Ictiologia2006-06-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252006000200017Neotropical Ichthyology v.4 n.2 2006reponame:Neotropical ichthyology (Online)instname:Sociedade Brasileira de Ictiologia (SBI)instacron:SBI10.1590/S1679-62252006000200017info:eu-repo/semantics/openAccessBowen,Mark D.Marques,SimoneSilva,Luiz G. M.Vono,VolneyGodinho,Hugo P.eng2007-12-10T00:00:00Zoai:scielo:S1679-62252006000200017Revistahttp://www.ufrgs.br/ni/https://old.scielo.br/oai/scielo-oai.php||neoichth@nupelia.uem.br1982-02241679-6225opendoar:2007-12-10T00:00Neotropical ichthyology (Online) - Sociedade Brasileira de Ictiologia (SBI)false |
dc.title.none.fl_str_mv |
Comparing on site human and video counts at Igarapava fish ladder, south eastern Brazil |
title |
Comparing on site human and video counts at Igarapava fish ladder, south eastern Brazil |
spellingShingle |
Comparing on site human and video counts at Igarapava fish ladder, south eastern Brazil Bowen,Mark D. Fish ladder On-site human counts Video image counts |
title_short |
Comparing on site human and video counts at Igarapava fish ladder, south eastern Brazil |
title_full |
Comparing on site human and video counts at Igarapava fish ladder, south eastern Brazil |
title_fullStr |
Comparing on site human and video counts at Igarapava fish ladder, south eastern Brazil |
title_full_unstemmed |
Comparing on site human and video counts at Igarapava fish ladder, south eastern Brazil |
title_sort |
Comparing on site human and video counts at Igarapava fish ladder, south eastern Brazil |
author |
Bowen,Mark D. |
author_facet |
Bowen,Mark D. Marques,Simone Silva,Luiz G. M. Vono,Volney Godinho,Hugo P. |
author_role |
author |
author2 |
Marques,Simone Silva,Luiz G. M. Vono,Volney Godinho,Hugo P. |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Bowen,Mark D. Marques,Simone Silva,Luiz G. M. Vono,Volney Godinho,Hugo P. |
dc.subject.por.fl_str_mv |
Fish ladder On-site human counts Video image counts |
topic |
Fish ladder On-site human counts Video image counts |
description |
On site human observations and video images were collected and compared at the window of the Igarapava Dam fish ladder (IDFL), rio Grande , Southeastern Brazil, between March 1st and June 30th, 2004. We conducted four experiments with two humans (Observer 1 and Observer 2) observing fish passage in the IDFL window while a Sony 3CCD video camera (Observer 3) recorded fish passage at the same time. Experiments, each one hour in length, were distributed throughout the diel cycle using full spectrum lights. We identified fish species, the number of individuals for each species, and the real time that they passed. Counts from each human observer were compared to the video counts. The fish species most commonly observed in the window were - curimba (Prochilodus lineatus), mandi-amarelo (Pimelodus maculatus), piau-três-pintas (Leporinus friderici) and ferreirinha (Leporinus octofasciatus). The number of species and individuals were indistinguishable for the three observers. But, the number of species and individuals were significantly different among experiments. Thus, the three observers register the same number of species and count the same number of individuals even when these two response variables differ significantly among experiments. Based on these results, we concluded that the video count was an accurate method to assess fish passage at the IDFL. |
publishDate |
2006 |
dc.date.none.fl_str_mv |
2006-06-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252006000200017 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252006000200017 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S1679-62252006000200017 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Sociedade Brasileira de Ictiologia |
publisher.none.fl_str_mv |
Sociedade Brasileira de Ictiologia |
dc.source.none.fl_str_mv |
Neotropical Ichthyology v.4 n.2 2006 reponame:Neotropical ichthyology (Online) instname:Sociedade Brasileira de Ictiologia (SBI) instacron:SBI |
instname_str |
Sociedade Brasileira de Ictiologia (SBI) |
instacron_str |
SBI |
institution |
SBI |
reponame_str |
Neotropical ichthyology (Online) |
collection |
Neotropical ichthyology (Online) |
repository.name.fl_str_mv |
Neotropical ichthyology (Online) - Sociedade Brasileira de Ictiologia (SBI) |
repository.mail.fl_str_mv |
||neoichth@nupelia.uem.br |
_version_ |
1752122178231336960 |