Artisanal fisheries in a Brazilian hypereutrophic reservoir: Barra Bonita reservoir, middle Tietê river

Novaes, José Luís Costa; Carvalho, Edmir Daniel

doi:10.1590/s1519-69842011000500003

Cited by 12 publications

(7 citation statements)

References 29 publications

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“…No introduced species were recorded at Jurumirim. According to Novaes & Carvalho (2011) several hypotheses can be put forward to explain these qualitative and quantitative results: i) the region exhibits good environmental quality; ii) the region is characterised by tributaries, such as the Santa Helena and Guareí Rivers, and upstream stretches of the Paranapanema River, that retain relatively well-preserved fish habitat; iii) the lagoons and small marginal lakes along the Paranapanema River are of great importance and provide shelter and food required for the development of fish larvae and juveniles (Godoy, 1975); iv) high habitat heterogeneity, including lotic and lentic environments, marginal lakes, floodplains, and refuges for small fish (e.g., macrophytes), as well as the presence of preserved tributaries, are factors that increase fish species diversity. The capture of "piquiri" (small species from basal trophic guilds) was also an indicator of good environmental conditions in the region, such as favourable water quality, well-preserved riparian vegetation, and the presence of aquatic macrophytes .…”

Section: Discussionmentioning

confidence: 99%

“…Among the active capture techniques employed, cast nets and beating gill nets have been successfully used to capture Nile tilapia in other Brazilian reservoirs (Câmara et al, 1998;Minte-Vera & Petrere Jr., 2000;Walter & Petrere Jr., 2007). Other active capture techniques used by fishers include the beach seine technique, which has also been used to successfully capture Nile tilapia (Novaes & Carvalho, 2011). This technique was used in the lentic region of the reservoir where the characteristics of the environment -such as shallow borders, fewer submerged trees, and marginal areas where fishers can retrieve nets and collect fish -favour its use.…”

Section: Discussionmentioning

confidence: 99%

“…Two other important tributaries of the Barra Bonita Reservoir, the Piracicaba and Sorocaba, which also receive large quantities of untreated domestic sewage, contribute to the hypertrophic state of the reservoir. Studies in the Barra Bonita Reservoir have recorded 39 species, with 10 introduced species (Petesse et al, 2007;Novaes & Carvalho, 2011).…”

Section: Methodsmentioning

confidence: 99%

“…In this study we compared data on artisanal fisheries (from Novaes & Carvalho, 2009;and Novaes & Carvalho, 2011) from the Jurumirim and Barra Bonita reservoirs. The following data on the fisheries in both reservoirs were obtained: information on catches (composition and biomass of fish in kilograms), effort (number of fishers) and fishing strategies.…”

Section: Methodsmentioning

confidence: 99%

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Analysis of artisanal fisheries in two reservoirs of the upper Paraná River basin (Southeastern Brazil)

Novaes

Carvalho

2013

Neotrop. ichthyol.

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We compared the artisanal fisheries, in terms of catch strategies, productivity, and gross per capita income, at two reservoirs: the Barra Bonita (an eutrophic reservoir with some introduced species), and the Jurumirim (an oligotrophic reservoir, with no introduced species). Published data and structured interviews with fishers were used to evaluate fishing activity, fish biomass, and the financial performance of the fisheries. In the Barra Bonita Reservoir we analysed data from 745 fishing trips, from which 86,691.9 kg of fish were landed, with a mean CPUE of 62.4 kg/fisher ), which constituted 24.5% of the biomass caught. Ordination analysis (PCA) indicated that there was a difference in composition between the fishing reservoirs and ANCOVA showed that there was a significant difference in fish production between the reservoirs. A Student's t-test showed that fishers in the Barra Bonita Reservoir had a significantly higher gross per capita income than those from the Jurumirim Reservoir. Although the Barra Bonita Reservoir has a higher fish production and the fishers earn a higher gross per capita income, we recommend the Jurumirim Reservoir as a model for artisanal fishery management because fishing activity in this reservoir is viable in the long term and such a model would promote conservation and sustainability. This contrasts with the Barra Bonita Reservoir, in which the fishery is not viable in the long term, due to environmental problems caused by artificial eutrophication and the introduction of alien species. It is also noted that in many countries, management of fisheries based on exotic species has not been viable in the long term.Nós comparamos a pesca artesanal, em termo de estratégia de captura, produtividade e renda per capita bruta em dois reservatórios: Barra Bonita (reservatório eutrófico e com espécies introduzidas) e Jurumirim (reservatório oligotrófico e sem espécies introduzidas). Dados publicados e entrevistas estruturadas mensais com os pescadores sobre a atividade de pesca, quilo pescado e rendimento financeiro, foram usados para as análises. ), que representou 24,5% da biomassa pescada. Uma análise de ordenação (PCA) indicou diferença na composição pesqueira entre os reservatórios e uma ANCOVA indicou diferença na produção pesqueira entre os reservatórios. Teste t de Student foi significativo e os pescadores do reservatório de Barra Bonita tiveram maior renda per capita bruta. Embora o reservatório de Barra Bonita tenha tido maior produção pesqueira e os pescadores maior renda, recomendamos o reservatório de Jurumirim como modelo para gestão de pesca artesanal nos reservatório, pois a atividade mostrou ser viável em longo prazo bem como ecologicamente correto. Isto contrasta como o reservatório de Barra Bonita, em que a pesca não é viável em longo prazo, devido a problemas ambientais provocados pela eutrofização artificial e pela introdução de espécie. Observou-se que em muitos países, o manejo da pesca com espécies exóticas, não tem sido viável em longo prazo.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Analysis of artisanal fisheries in two reservoirs of the upper Paraná River basin (Southeastern Brazil)

Novaes

Carvalho

2013

Neotrop. ichthyol.

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“…The ichthyic community and fishing activity in areas influenced by hydroelectric plants in southern Brazil have been studied by several authors in recent decades (Okada et al, 1997;Agostinho and Gomes, 2005;Luiz et al, 2005;Beux and Zaniboni-Filho, 2008;Meurer, 2010;Novaes and Carvalho, 2011). The relationship between the damming of the large rivers and subsequent changes in the fish fauna and the ecological and social characteristics of the areas has also been discussed.…”

Section: Introductionmentioning

confidence: 99%

Analysis of fishing activity in the Itá reservoir, Upper Uruguay River, in the period 2004-2009

2013

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This study characterized fishing activity in the reservoir of the Hydroelectric Power Plant of Itá in Brazil. The reservoir is located in the Upper Uruguay River, which forms the border between the states of Santa Catarina and Rio Grande do Sul. To analyze fishing activity and the composition of ichthyofauna in the reservoir after damming, questionnaires were administered to fishermen in the region between 2004 and 2009. The results showed that fishing in the Itá reservoir can be classified as a subsistence activity performed on small vessels and usually involving the use of drift nets and handlines. Between 2004 and 2009, 292,780.10 . A total of 27 morphospecies were captured during the sample period; carp, traíra, mandi and jundiá together accounted for almost 60% of the catch. This finding indicates that fishing is centered on the capture of sedentary and short-distance migratory species. Despite their lower abundance, long-distance migratory species continue to be captured. The case of the piracanjuba, a long-distance migratory species reintroduced to the region in 2004 and still present in the catches, is particularly noteworthy. Regarding the fishermen's socioeconomic profile, all were men, most of who have engaged in the activity for more than eleven years, have a low educational level, fish with the aid of family members and list agriculture as their main economic activity. . Foram registrados os maiores valores de Captura Por Unidade de Esforço em 2006, com médias anuais de 9,69 kg pescador -1 dia -1 . Um total de 27 morfoespécies foram capturadas, com destaque para a carpa, a traíra, o mandí e o jundiá que juntas somaram quase 60% do total capturado ao longo do período estudado, indicando que a pesca está centrada na captura de espécies sedentárias e migradoras de curtas distâncias. Apesar da menor abundância, as espécies migradoras continuam sendo capturadas ao longo dos anos, em especial a piracanjuba, que foi reintroduzida na região em 2004 e que continua presente nas capturas. Em relação ao perfil socioeconômico, os pescadores são todos homens que em sua maioria, estão há mais de 11 anos na atividade, possuem baixo grau de instrução, desenvolvem a pesca com auxílio dos demais membros da família e têm a agricultura como principal atividade econômica. KeywordsPalavras-chave: recursos pesqueiros, represamentos, pesca continental.

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Brazil’s urban ecosystems threatened by law

Azevedo‐Santos

Daga²,

Tonella

et al. 2023

Land Use Policy

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Artisanal fisheries in a Brazilian hypereutrophic reservoir: Barra Bonita reservoir, middle Tietê river

Cited by 12 publications

References 29 publications

Analysis of artisanal fisheries in two reservoirs of the upper Paraná River basin (Southeastern Brazil)

Analysis of artisanal fisheries in two reservoirs of the upper Paraná River basin (Southeastern Brazil)

Analysis of fishing activity in the Itá reservoir, Upper Uruguay River, in the period 2004-2009

Brazil’s urban ecosystems threatened by law

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