Financial comparisons of the artisanal fisheries in Urubupungá Complex in the middle Paraná River (Brazil)

Abstract

The main objective of this study was a bio-economic survey of artisanal fishing so as to compare average profit of the fishermen, in two different environments (reservoirs and river) and seasons (dry and rainy). To carry out financial comparisons of artisanal fisheries in Urubupungá Complex in the middle Paraná River (Brazil), three habitats were considered: I) Ilha Solteira and Jupiá reservoirs; II) the Paraná River between the Jupiá and Primavera dams; III) the Paraná River downstream from the Primavera dam. Data collection was done through questionnaires addressed to a total of 187 fishersmen; just 164 of the resulting interviews were considered valid. They were held in July 1998 (dry season) and February 1999 (rainy season). The daily average profit of the resevoir fisherman was R$ 13.19 during the dry and R$ 19.54 during the rainy season; R$ 4.10 and R$ 12.92 for fishermen located on the Paraná River between Jupiá and Primavera dam; and R$ 1.48 and R$ 23.01 for those located on the Paraná River below Primavera dam (R$ 1.00 = US$ 0.86 during the dry season; R$ 1.00 = US$ 0.52 during the rainy season). A linear model had been tried to explain the profit variable, in relation to those variables directly linked to fishing (e.g., as habitats; seasons, dry or rainy; gear used; days spent fishing) as well as several sociological variables (age, marital states, number of dependents, and education). However, due to large variability in profits, the proposed model only explained 48.4% of variability, and the only significant factors were education, type of gear, and covariant fishing days.Key words: inland fisheries, dams, rivers, bio-economics. RESUMO Comparação financeira entre as pescarias artesanais no complexo de Urubupungá, no médio rio Paraná (Brasil)Este trabalho teve por principal objetivo o levantamento bioeconômico das pescarias artesanais, a fim de comparar o lucro médio dos pescadores, considerando os diferentes ambientes (reservatórios e leito do rio) e épocas (seca e chuvosa). Para a execução das comparações financeiras das pescarias artesanais no Complexo de Urubupungá no rio Paraná (Brasil) foram considerados 3 ambientes: I) reservatórios de Ilha Solteira e Jupiá; II) rio Paraná entre as barragens de Jupiá e Primavera; e III) rio Paraná a jusante da barragem de Primavera. O levantamento de dados foi realizado mediante a aplicação de questionários, num total de 187 pescadores entrevistados, sendo consideradas válidas 164 entrevistas. As entrevistas foram realizadas em julho/98 (época seca) e fevereiro/99 (época chuvosa). O lucro médio diário nas épocas seca e chuvosa,

Income evaluation of small - scale fishers in two brazilian urban reservoirs: Represa Billings (SP) and Lago Paranoá (DF)

“…The formulae used for the computation of fisher's income, costs and profits, closely follows Ceregato and Petrere (2003).…”

“…Ceregato & Petrere (2003) when comparing the profit of small-scale fisheries in the Urubupungá complex of reservoirs in the river Paraná downstream, found average daily profits of R$ 13.2 (U$ 11.3 as 1 U$ = R$ 1.1628 in July/98) (s = 25.4) for the reservoirs of Ilha Solteira (SP) and Jupiá (SP), of R$ 4.1 (U$ 3.5) (s = 21.3) for the Paraná river and of R$ 1.5 (U$ 1.3) (s = 35.1) for downstream Porto Primavera dam, in the dry period. In the rainy period, the daily profit was: R$ 19.5 (U$ 10.2 as 1 U$ = R$ 1.9231 in February/99) (s = 37.4) for the reservoirs of Jupiá and Ilha Solteira, R$ 12.9 (U$ 6.7) (s = 46.0) for the Paraná River between these reservoirs and Porto Primavera and R$ 23.0 (U$ 11.97) (s = 29.2) below the dam.…”

“…by the reservoir where it is carried out and by the number of days of fishing. Ceregato & Petrere (2003), when studying Rio Paraná's professional fishers, observed that the profit could be explained also by other variables such as formal education and type of fishing equipment.…”

Small-scale marine fisheries in the municipal district of Florianópolis, Santa Catarina, Brazil

“…The campaigns consisted of visits to different fishing communities, where the fishers present at the site were interviewed and indicated others to be interviewed later, according to the "snowball" methodology (Camargo and Petrere (2001), Cetra and Petrere (2001), Ceregato and Petrere (2003) and Petrere et al (2006). The data were Table 1 also presents the periods of higher catches per species.…”

An ecological economics approach to estimate the value of a fragmented wetland in Brazil (Mato Grosso do Sul state)

“…Due to the anthropogenic modifications, the periodic floods were altered in periodicity and amplitude (Agostinho et al, 2004) with negative consequences for the reproductive cycle of some species of fishes (Agostinho et al, 1993;Agostinho et al 2001) and for the economy of local artisanal fishery and its catches (Agostinho et al, 1994;Carvalho, 2002a;Ceregato and Petrere, 2003) Despite these changes, the region still has a high diversity of endemic and rare species amongst its 417 terrestrial vertebrates (60 mammals, 37 reptilians, 298 birds and 22 amphibians), 176 fishes, 745 terrestrial or floodplain plants, 60 species of aquatic vegetation (macrophytes), more than 446 taxa of plankton algae, circa of 385 taxa of zooplankton and 188 of zoobenthos (Mussara, 1984;Agostinho and Zalewski, 1996;MinteVera and Carvalho, 1998;Agostinho et al, 2004).…”