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

2013 ◽  
Vol 73 (3) ◽  
pp. 559-571 ◽  
Author(s):  
. Schork ◽  
Hermes-Silva. G. ◽  
. S ◽  
E. Zaniboni-Filho

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 kg worth of fish were captured, with an average annual productivity of 3.46 kg ha−1 yr−1. We recorded the highest values of catch per unit effort in 2006, with an annual average of 9.69 kg fisherman−1 day−1. 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.

2012 ◽  
Vol 10 (4) ◽  
pp. 797-804 ◽  
Author(s):  
Lucileine de Assumpção ◽  
Maristela Cavicchioli Makrakis ◽  
Sergio Makrakis ◽  
Ricardo Luiz Wagner ◽  
Patrícia Sarai da Silva ◽  
...  

This study investigated the external body morphology (based on morphometric data) and the swimming efficiency in fish passages (based on the ascent time in a fish ladder) of two Neotropical long-distance migratory species. The fish were collected in the fish ladder of the Porto Primavera Hydroelectric Power Plant (known as Engenheiro Sergio Motta), upper Paraná River, Brazil. The species differ in several morphometric ratios related to swimming performance. Prochilodus lineatus exhibited a higher muscle ratio and caudal fin length ratio. However, Leporinus elongatus showed higher values for the fineness ratio, a higher length from snout to pectoral fin base ratio, and a higher caudal peduncle depth factor. Although both species show good swimming performance, the characteristics listed above may enable L. elongatus to apply greater power and propulsion, allowing it to reach a high swimming speed and to exhibit greater efficiency than P. lineatus. Leporinus elongatus moves faster than P. lineatus and has a lower mean ascent time (1.39 hours) than P. lineatus (3.76 hours). Prochilodus lineatus would require a somewhat longer time to pass through the fish ladder.


2020 ◽  
Vol 36 (8) ◽  
pp. 1598-1611
Author(s):  
Daniel Cataldo ◽  
Florencia Gattás ◽  
Valentín Leites ◽  
Facundo Bordet ◽  
Esteban Paolucci

2021 ◽  
Author(s):  
Elena Shirkova ◽  
Eduard Shirkov

"The article presents an overview of the technical, economic, and environmental arguments in favour of wider use of the gigantic energy potential of sea tides to solve the most important climate problem today – the reduction of anthropogenic pollution of the Earth's atmosphere with carbon dioxide. The main idea of the considered solution is the replacement of carbon fuels for thermal power plants and transport with ""green"" hydrogen. The production of such hydrogen is carried out by electrolysis using the energy of carbon–free renewable sources. Tidal hydroelectric power plants are the cheapest, largest and most economically safe electricity supplier for the production of green hydrogen today. Until now, this direction of the energy sector has not become widespread due to the high capital intensity, as well as due to the geographic remoteness of the places where tidal energy is concentrated from large centres of electricity consumption. The explosive growth in global hydrogen demand in recent years alleviates the problem of very expensive transport and large losses in long distance transmission of electricity. Hydrogen can be transported without loss and relatively cheaply by pipelines and sea tankers over unlimited distances. The use of the energy of the highest tides and flow in the Pacific Ocean for the production of ""green"" hydrogen is proposed in the revived project of construction of the world's largest Penzhinsk Tidal Hydroelectric Power Plant (the Sea of Okhotsk’ north–east, Russia)."


Author(s):  
Cleide Lima de Souza ◽  
Voyner Ravena Cañete

Este artigo descreve o cenário que envolve a pesca e suas nuances no lago artificial da hidrelétrica de Tucuruí-Pa (Brasil). Enfatiza as contradições no acesso e uso dos recursos pesqueiros que permeiam realidades bastante antagônicas: um grupo que realiza a pesca esportiva por diversão e lazer e outro de pescadores artesanais que busca o sustento nesta atividade, principal fonte de renda e de alimento. Os procedimentos metodológicos primaram pela investigação junto aos pescadores no interior do lago por meio de trabalho de campo e compilação de dados secundários em três municípios que detêm a maior produção de pesca (Tucuruí, Nova Jacundá e Novo Repartimento) dos sete que envolvem o lago. Tece análise a partir das políticas de ecoturismo, da pesca esportiva e da pesca artesanal. Utiliza-se da categoria memória coletiva para descrever o ambiente aquático anterior ao lago e compreender de que forma esta memória contribui para os pescadores locais e os imigrantes no processo de adaptação e criação de novas práticas para acesso e uso dos recursos pesqueiros. O artigo conclui que a pesca esportiva, concebida como uma atividade de ecoturismo desenvolvida em um ambiente fortemente impactado impõe uma nova dinâmica aos pescadores artesanais, demandando dos mesmos a informação sobre a localização dos pontos de pesca e a geografia do lago. Por outro lado, o pescador artesanal passa a se relacionar com a sociedade maior através do seu saber, estabelecendo uma relação com o mercado mediada por um novo produto: o saber sobre a própria atividade da pesca. Sport fishing and artisanal fishing: Leisure and subsistence at the Tucuruí (PA, Brazil) hydroelectric power plant AABSTRACT This article describes the context related to fishing and its nuances at the artificial lake at the hydroelectric power plant of Tucuruí (PA, Brazil). The article emphasizes the contradictions in the access and use of fishing resources of quite antagonistic realities: a group involved in sport fishing for recreation and leisure and another group of artisanal fishermen that carry out the activity as their main form of subsistence, source of income and food supply. The methodological procedures focused mainly on an investigation with lake fishermen by means of a fieldwork and the compilation of secondary data in 3 of the 7 municipalities that sorround the lake. The municipalities of Tucuruí, Nova Jacundá and Novo Repartimento present the major fishing production in the area. The article also develops and analysis based on ecotourism policies, sport fishing and artisanal fishing. The category collective memory is used to describe the aquatic environment before the creation of the lake and understand how this form of memory contributes to local fishermen and immigrants in the process of adaptation and creation of new practices for the access and use of fishing resources. The study concludes that sport fishing, conceived as an ecotourism activity developed in an environment that is greatly impacted imposes a new dynamic to artisanal fishermen, demanding from them the information about the localization of the fishing spots and the geography of the lake. On the other hand, artisanal fishermen develop a form of relationship with society through its knowledge, establishing a relation with the market mediated by a new product: the knowledge about the fishing activity itself.. KEYWORDS: Artificial Lake; Sport Fishing; Artisanal Fishing; Collective Memory; Ecotourism.


2012 ◽  
Vol 10 (4) ◽  
pp. 785-795 ◽  
Author(s):  
Ricardo Luiz Wagner ◽  
Sergio Makrakis ◽  
Theodore Castro-Santos ◽  
Maristela Cavicchioli Makrakis ◽  
João Henrique Pinheiro Dias ◽  
...  

This paper presents results of a fishway evaluation performed at the Engenheiro Sérgio Motta Hydroelectric Power Plant (known as Porto Primavera) - CESP, Paraná River, Brazil. The evaluation was designed to quantify entry and passage proportions of 4 long-distance migratory fish species: Brycon orbignyanus (piracanjuba), Piaractus mesopotamicus (pacu), Prochilodus lineatus (curimba), and Rhinelepis aspera (cascudo-preto). Proportions finding and entering the fishway differed between species, ranged from 7.4 % (Prochilodus lineatus) to 55.4% (Piaractus mesopotamicus). Also, proportion passing was different between species, ranged from 31% (R. aspera) to 100% (Prochilodus lineatus). Fish that were marked and released within the fishway had greater failure rates than those that entered volitionally. Total time to pass ranged from 1.48 hours (Prochilodus lineatus) to 178.9 hours (R. aspera). Failure rates were greatest in the lower end of the fishway. Although some individuals of all species passed successfully, significant challenges remain to restoring connectivity of the upper Paraná River.


2002 ◽  
Vol 122 (6) ◽  
pp. 989-994
Author(s):  
Shinichiro Endo ◽  
Masami Konishi ◽  
Hirosuke Imabayashi ◽  
Hayami Sugiyama

Author(s):  
Michal Kuchar ◽  
Adam Peichl ◽  
Milan Kucera ◽  
Jaromir Fiser ◽  
Pavel Kulik ◽  
...  

2014 ◽  
Vol 36 (1) ◽  
pp. 53-60 ◽  
Author(s):  
Maciej Korczyński ◽  
Ewa Krasicka-Korczyńska

Abstract Cypripedium calceolus is considered an endangered species in the territory of Poland. Population of this rare species, situated at Lake Kwiecko (Western Pomerania), was regularly monitored in the years 1986-2013. The studied population has been under the permanent influence of the nearby hydroelectric power plant for almost 45 years. The field observations showed that the power plant had no negative impact on the condition of Cypripedium calceolus population. An indication of its good condition was, among others, an increase in the size - from 150 to 350 specimens within the study period.


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