Comparação da eficiência de dois métodos de coleta de peixes em igarapés de terra firme da Amazônia Central

Ribeiro, Odirlene Marinho; Zuanon, Jansen

doi:10.1590/s0044-59672006000300017

Cited by 11 publications

(9 citation statements)

References 5 publications

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“…Given the high correlation between abundance and richness, it is evident that these techniques are more efficient due to their capacity of catching a greater number of individuals per unit of effort, when compared to the cast and gill nets. Ribeiro and Zuanon (2006) observed for igarapés in central Amazon that an active method of fish capture was more efficient than a passive one. This was justified by the high rates of escape associated with the passive method.…”

Section: Discussionmentioning

confidence: 94%

Effects of fishing technique on assessing species composition in aquatic systems in semi-arid Brazil

et al. 2010

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In most ecological field research, appropriate sampling is critical for the understanding of processes underlying fish populations and communities, and is even more important in heterogeneous environments such as the aquatic systems of the semi-arid region of Brazil. This study intends to make a contribution to the development of sampling programs and gear selection in aquatic systems of semi-arid Brazil by evaluating the effects of different fishing techniques on the assessment of richness and composition of the fish fauna in selected aquatic environments. Six sites were selected to represent typical artificial (reservoirs) and natural (intermittent streams) environments and four different types of sampling gear were applied to each site during four occasions. The present study shows that when selecting sampling techniques to be used in aquatic systems in semi-arid Brazil, one must consider the objectives of the study, e.g. ecological or taxonomic, in order to decide on inclusion of rare species in the sampling population. Also, the effect of the sampling gear on natural abundances of fish must be considered given that some sampling techniques are highly detrimental to fish population numbers.Keywords: semi-arid, fish, richness, sampling technique, intermittent streams. Efeitos de diferentes artes de pesca na avaliação da composição de espécies em ambientes aquáticos do semiárido brasileiro ResumoNa maioria dos estudos ecológicos, uma amostragem representativa é crucial para o conhecimento dos processos que organizam populações e comunidades de peixes, principalmente em ambientes reconhecidamente heterogêneos como os ecossistemas aquáticos da região semiárida do Brasil. O presente estudo pretende contribuir para este conhecimento avaliando os efeitos de diferentes técnicas de captura de peixes na riqueza e composição das espécies amostradas em ambientes aquáticos do semiárido. Seis pontos de coleta foram selecionados, representando ambientes aquáticos artificiais (açudes) e naturais (rios intermitentes), onde quatro tipos de apetrechos de pesca foram empregados em quatro ocasiões. O presente estudo mostra que, ao selecionar técnicas de amostragem de peixes em ambientes aquáticos do semiárido brasileiro, dois fatores devem ser levados em consideração: primeiro, os objetivos do estudo, ecológicos ou taxonômicos, para se avaliar a importância da inclusão de espécies raras na população amostral; e segundo, os efeitos da técnica de amostragem na abundância natural de espécies, tendo em vista que algumas artes de pesca têm um efeito negativo nos números populacionais das espécies de peixes.Palavras-chave: semiárido, peixes, riqueza de espécies, artes de pesca, rios intermitentes.

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Section: Discussionmentioning

confidence: 94%

Effects of fishing technique on assessing species composition in aquatic systems in semi-arid Brazil

et al. 2010

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“…Shrimps were captured using minnow-traps (Ribeiro & Zuanon, 2006;Kemenes et al, 2010) baited with sardines and sausage, during a 12-h sample period. A total of 12 traps were placed near each stream margin at each sample station, at a distance of 10 m from one another.…”

Section: Data Collectionmentioning

confidence: 99%

Population structure, fecundity and ecological aspects of freshwater shrimp species (Decapoda, Palaemonidae) of an urban forest fragment in central Amazonia, Brazil

Menin¹,

Almeida²,

Gualberto³

2012

Crustac

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Information about population structure, ecological aspects and reproductive biology of Amazonian freshwater shrimps is scarce in the scientific literature and concentrated in studies conducted in rivers. In this study we present data about species composition, population structure, abundance, fecundity and effects of abiotic factors on the distribution of freshwater shrimps in small streams at an urban forest fragment in Manaus, Central Amazonia, We collected the shrimps using minnowtraps in 12 first-and second-order streams in dry and rainy seasons. We found four species: Macrobrachium ferreirai Kensley & Walker, 1982, Macrobrachium inpa Kensley & Walker, 1982, Macrobrachium nattereri (Heller, 1862 and Pseudopalaemon amazonensis Ramos-Porto, 1979, First order streams had a higher number of species. Adults and juveniles of all species and ovigerous females were found in the majority of the sampling events. Males were more abundant and larger than females in all species of Macrobrachium. All species had a few, large eggs, Tbe abundance of M. nattereri was affected by stream size and temperature. The population structure of the studied species was different from those in other studies on shrimp populations in Central Amazonia and other regions of Brazil, indicating effects of samphng methods and the structure and size of water bodies on the population structure in different regions. The presence of ovigerous females in all sampling periods indicates continuous reproduction. RESUMOInformaçôes sobre a estrutura populacional, biologia reprodutiva e aspectos ecológicos de camaröes de agua doce da Amazonia sao raras e concentradas em estudos realizados em grandes corpos d'água. No presente estudo, nosso objetivo foi avahar a composiçâo e a abundancia das especies, a estruturapopulacional, a fecundidade e os efeitos de fatores abióticos sobre a distribuiçâo de camaröes em pequeños riachos de um fragmento florestal urbano em Manaus, Amazonia Central, )

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“…A amostragem passiva é realizada utilizando--se petrechos sem a intervenção direta do coletor, causando uma menor perturbação ao ambiente, contrariamente ao método ativo, que consiste na captura utilizando-se petrechos que perturbam o ambiente, seja pela movimentação dos coletores ou pela alteração de microhábitats (Ribeiro & Zuanon, 2006).…”

Section: Introductionunclassified

“…Métodos passivos de amostragem foram previamente estudados nos aspectos da avaliação do melhor tempo de submersão das armadilhas e da eficiência dos atrativos na captura de peixes (Sanches & Sebastiani, 2009); dos tipos de petrecho (armadilhas e redes) na captura do siri-azul (Atar et al, 2002); da seletividade das armadilhas quanto ao tamanho dos peixes (Bohnsack et al, 1989;Gobert, 1998); da comparação entre métodos passivos e ativos na amostragem de peixes (Uieda & Uieda, 2001;Ribeiro & Zuanon, 2006); entre formatos de armadilhas (Collins, 1990); e descrição sobre vantagens e desvantagens de métodos passivos e ativos de amostragem de peixes (Uieda & Castro, 1999). São métodos frequentemente utilizados como amostradores complementares, principalmente em ambientes estuarinos rasos (Rozas & Minello, 1997).…”

Section: Introductionunclassified

“…Outra vantagem da utilização desse método é que os animais ficam vivos, portanto, indivíduos juvenis e fêmeas ovígeras podem ser devolvidos logo após a captura (Atar et al, 2002). Porém, esses métodos são mais seletivos e menos eficientes do que os ativos quanto à riqueza e abundância das espécies capturadas (Uieda & Castro, 1999;Ribeiro & Zuanon, 2006), sendo ainda que, a eficiência de captura dependerá principalmente do tipo de atrativo (i.e. tipo de isca) utilizado, os quais deverão corresponder às características tróficas das espécies alvo (Hubert, 1996;Uieda & Castro, 1999;Sanches & Sebastiani, 2009;Rocha, 2010 (Rozas & Minello, 1997).…”

Section: Introductionunclassified

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Seletividade de armadilhas e atrativos na captura de pequenos peixes e crustáceos em ambientes estuarinos

Possamai

Rosa

Corrêa

2014

Braz. J. Aquat. Sci. Technol.

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In this study we tested capture efficiency of two of plastic bottle traps and four kinds of baits (fresh cow liver, broken corn, meat flavored dog food and commercial bait for amateur fishing) for small crustaceans and fishes at estuarine environments (saltmarshes and tidal creeks). Smaller trap opening sizes mainly limited the capture of organisms with hard exoskeleton such as crabs. There were no significant differences in number of species, abundance and/or biomass of captured organisms among baits. However, a bait/feeding behavior relationship was observed. The traps and baits were efficient in capturing small fishes and crustaceans, and therefore can be applied as a complementary method in ichthyological and crustaceans surveys at estuarine shallow water environments. However, in order to increase capture efficiency we recommend to use mixed baits, which best represent the trophic group diversity present in the study area.

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Comparação da eficiência de dois métodos de coleta de peixes em igarapés de terra firme da Amazônia Central

Cited by 11 publications

References 5 publications

Effects of fishing technique on assessing species composition in aquatic systems in semi-arid Brazil

Effects of fishing technique on assessing species composition in aquatic systems in semi-arid Brazil

Population structure, fecundity and ecological aspects of freshwater shrimp species (Decapoda, Palaemonidae) of an urban forest fragment in central Amazonia, Brazil

Seletividade de armadilhas e atrativos na captura de pequenos peixes e crustáceos em ambientes estuarinos

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