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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Identifica??o de novas esp?cies com potencial para a cria??o em cativeiro: pescado capturado no estado do Amazonas / Identification of new species with farming potential: fishes captured in the state of Amazonas.

Costa, Tiago Viana da 28 July 2006 (has links)
Made available in DSpace on 2016-04-28T14:59:42Z (GMT). No. of bitstreams: 1 2006- Tiago Viana da Costa.pdf: 1058875 bytes, checksum: 7ae63cb486e9dd7aa7baf6bc434539ca (MD5) Previous issue date: 2006-07-28 / The Amazon region has around 40 species of fishes being explored and commercialized daily, especially in markets and fairs. Fisheries are basically artisanal, directed towards a small number of species, causing the over exploitation of certain fishing stocks. However, some species have certain characteristics for farming, which would help diminish the fishing pressure over these species. With the objective of identifying new species for farming, fishing variables were analyzed from the V?rzea Natural Resource Management Project s data base. The gathering of information took in consideration the years from 2001 to 2004, allowing the identification of fisheries captured along the main channel of the Amazon river. Data analyses revealed that the 10 main most captured fish categories, were responsible for 82,46% of the total volume captured in the state of Amazonas, with special reference to the order of the Characiforms, representing 78,34% of the captures. The abundance of fishery resources depends directly on the environmental variations (inundation), fact that contributes to the oscillation of the price and inconstancy of the availability some species of fishes during the flooded season. Fish farming can precisely compensate this need of the market and dilute the pressure over the natural stocks. The informations obtained from ProV?rzea/Ibama about fish farming data in the State and the fisheries exportation of fisheries, gathered from SEAP/PR and Fishery Resource Center of Ibama/AM, the aruan? and mapar? can be pointed out as species with farming potential. The analyzes involving captur per unit effort revealed a productivity of 11-20 Kg/Fisherman/Day for the aruan?, which is the fifth category most captured in the state (3,83% of the total) and the seventh of the exportation list; and 21-31 Kg/Fisherman/Day for the mapar?, tenth most captured species and the third in terms of exportation. The analyses of carcass profit and chemical composition and quality of fishes, revealed that the carnivorous aruan?, captured mainly in the dry season and that had its filet as the main commercialized product, presented a profit of 29,15 ? 1,48%, with the chemical analyses, characterizing it as a low fat fish (0,08%) with high protein value (15,19 %). The planktophagous mapar?, captured throughout the year, presented a profit of its filet of 53,04 ? 1,40% and the chemical analyses allowed the classification of this fish as fat (21,21% fat) with low protein value (12,85 %). / A regi?o Amaz?nica possui cerca de 40 esp?cies de peixes sendo exploradas e comercializadas diariamente, nos principais mercados e feiras. A pesca na regi?o ? basicamente artesanal, direcionada a um n?mero diminuto de esp?cies, causando uma sobreexplota??o em determinados estoques pesqueiros. No entanto, algumas esp?cies apresentam caracter?sticas para serem criadas em cativeiro, o que ajudaria a diminuir a press?o da pesca sobre as mesmas. Com o objetivo de identificar novas esp?cies para a cria??o em cativeiro, foram analisadas vari?veis pesqueiras a partir do banco de dados central do Projeto Manejo dos Recursos Naturais da V?rzea, sendo utilizado os dados de 2001 a 2004, permitindo a identifica??o dos pescados mais capturados na calha do Rio Solim?es/Amazonas. A an?lise dos dados revelou que as 10 primeiras categorias de pescado mais capturadas correspondiam em m?dia 82,46% do volume total capturado no estado do Amazonas, destacando-se a ordem dos Characiformes, com 78,34% das capturas. A abund?ncia de pescado depende diretamente das varia??es ocorridas no ambiente (pulso de inunda??o), fato este que contribui para oscila??o no pre?o e inconst?ncia de oferta de algumas esp?cies de pescado durante o per?odo de cheia. A piscicultura poder? vir justamente suprir esta car?ncia do mercado e diluir a press?o nos estoques naturais. As informa??es obtidas no ProV?rzea/Ibama juntamente com os dados de piscicultura do estado e da exporta??o de pescado, levantados junto a SEAP/PR e N?cleo de Recursos Pesqueiros do Ibama/AM destacaram-se o aruan? e o mapar? como esp?cies potenciais para a piscicultura. As an?lises envolvendo a captura por unidade de esfor?o revelaram uma produtividade de 11-20 Kg/pescador/dia para o aruan?, que ? a quinta categoria mais capturada no estado (3,83% do total) e a s?tima na lista de exporta??o; e 21-31 Kg/pescador/dia para o mapar?, d?cima categoria mais capturada e a terceira na lista de exporta??o. J? as an?lises de rendimento de carca?a e da composi??o qu?mica e da qualidade do pescado, revelaram que o carn?voro aruan?, capturado basicamente na seca e que teve seu fil? como principal produto comercializado, apresentou um rendimento de 29,15 ? 1,48%, com as an?lises qu?micas que o caracterizam como um pescado magro (0,08% gordura) com alto teor prot?ico (15,19 %PB). O planct?fago mapar?, despescado ao longo de todo ano, apresentou um rendimento de fil? de 53,04 ? 1,40% e a an?lise qu?mica permitiu classificar este pescado como gordo (21,21% de gordura) e de baixo valor prot?ico (12,85 %PB).

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