The Fishing Productivity Assessement Upstream and Downstream of Tucuruí Hydroeletric Dam, Tocantins-Araguaia basin, Brazil

Abstract

The Tocantins-Araguaia basin is the second largest in Brazil and the most extensive in the drainage area totally placed in Brazilian territory. A time series of fishery production of more than 30 years of Tucuruí Hydroeletric dam, between 1981 and 2016, in low Tocantins, in ten landing harbor (five upstream and five downstream) was analyzed to compare productivity and indicate suggestions for better planning and public policies focused on the fishery resources in this basin. After analyzing over 16,000 landing data, CPUE (kg / day) indicated that after an exponential growth upstream in the first 15 years of the dam, there was a decline trend in fish stocks up to 2016, mainly upstream. The biodiversity of the ichthyofauna was higher downstream and Mapará H. marginatus was the main species captured. It is concluded that the maintenance and accessibility by society of a program to monitoring landings in the region, as well as studies of population dynamics in order to better plan the fishing effort, is fundamental. It should also be emphasized that environmental education should focus on the involvement of fishing communities, alerting public managers about the importance of knowledge about productivity and that the decline trend of upstream stocks should be considered in the formulation or incentive of policies aimed at development of artisanal fisheries on Tocantins-Araguaia basin.

Hydropower Plants and Ichthyofauna in the Tocantins–Araguaia River Basin: Challenges for Planning and Approaches to Ichthyofauna Conservation

“…The reduction in the populations of large migratory catfish, such as filhote, piraíba, and dourada of the Brachyplatystoma genus, is notable, particularly in the middle reaches of the Tocantins River, where they were once an important component of fishing but are now sporadically caught [61], as anticipated since the construction of Tucuruí [16]. Alternatives to mitigate and compensate for the impacts are often suggested for short periods and generally disregard the cumulative effects and those that are noticeable in the long term.…”

Fishery regulamentation or ethnoknowledge? The dilemma of the management of the mapará fisheries on the lower Tocantins river in northern Brazil

“…This destabilizes the fishery governance system and, ultimately, contributes to a decrease in the sustainability of this activity (Isaac et al, 1993;Johannes et al, 2000;ST. Martin, 2006;Pryshon;Cunha;Dias., 2019). This authoritative approach to the regulation of the fisheries reflects the belief that the fishers are incapable of understanding the ecological system and the measures necessary to regulate their fishery activities to guarantee their long-term sustainability (Mcgoodwin, 2000).…”

Clusterização de dados mistos para análise da atividade pesqueira artesanal na bacia Araguaia-Tocantins

“…A diversidade de espécies capturadas talvez seja o fator mais relevante para as pescarias do cluster 2, garantindo assim, melhores condições de negociação, (Juras et al, 2004, Hallwass, 2011, Prysthon et al, 2019. Porém, o valor de venda desses peixes é de no máximo R$2,50/kg (veri cação de campo).…”