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Biota neotrop. (Online, Ed. port.) ; 9(2): 179-186, Apr.-June 2009. tab
Article in Portuguese | LILACS | ID: lil-529220

ABSTRACT

A microbacia do rio Jaguari pertence à Bacia Hidrográfica do rio Uruguai e tem sua foz na margem superior do rio Ibicuí. Este trabalho teve o objetivo de identificar a Ictiofauna existente em um trecho da microbacia do rio Jaguari, em Jaguari-RS. Para a realização da pesquisa foram realizadas identificações de exemplares capturados nas quatro estações do ano, através do uso de redes de espera das seguintes malhas (medidas em cm entre nós adjacentes): 1,0; 1,5; 2,0; 2,5; 3,0; 4,0; 5,0; 6,0; e 7,0. As redes de espera permaneceram na água por 24 horas, sendo revisadas a cada seis horas, sempre nos mesmos horários (06:00; 12:00; 18:00 e 24:00 horas). Os peixes coletados, após serem identificados, foram numerados e, logo após, fixados em formol a 4,0 por cento e depois conservados em álcool 70,0 por cento. Foram identificados um total de 572 indivíduos, distribuídos em 14 famílias e 26 espécies. Na primavera ocorreu a maior captura, com 156 indivíduos, distribuídos em 15 espécies; no verão ocorreu a maior riqueza, com 146 indivíduos distribuídos em 19 espécies; já no outono e inverno ocorreu uma captura de 135 indivíduos para ambas as estações, com 16 e 12 espécies, respectivamente. A espécie mais abundante, com 291 exemplares, foi Apareiodon affinis, sendo que Hemiancistrus fuliginosos (75), Hypostomus commersoni (50) e Steindachnerina brevipina (41) também tiveram alta representatividade.


The microbasin of the Jaguari river belongs to the hydrographic basin of the River Uruguay and has its estuary in the raised edge of the river Ibicuí. This work had the objectif identify the existing ictyofaun of the microbasin of the river Jaguari in Jaguari-RS. For the accomplishment of the research identifications of units captured in the four months of the year had been carried through, being that nets of wait of each one of following meshes (measured in cm between adjacent points): 1.0; 1.5; 2.0; 2.5; 3.0; 4.0; 5.0; 6.0; and 7.0. The wait nets had remained in the water for 24 hours, being revised to each six hours, always in same periods (06:00 AM; 12:00 AM; 06:00 PM and 12:00 PM hours). The collected fish, after to be identified, had been numbered and then after, fixed in formaldehyde conserved 4.0 percent and later in alcohol 70.0 percent. A total of 572 individuals in the four stations of the year were identified, distributed in 14 families and 26 species. In the spring the biggest capture occurred, with 156 individuals, distributed in 15 species; in the period of summer the biggest richness occurred, with a capture of 146 individuals distributed in 19 species; in the autumn and winter a capture of 135 individuals for both occurred the stations, with a richness of 16 and 12 species, respectively. The species most abundant, with 291 units, was Apareiodon affinis, being that Hemiancistrus fuliginosos (75), Hypostomus commersoni (50) and Steindachnerina brevipina (41) also had high representation.


Subject(s)
Aquatic Fauna , Biodiversity , Ecosystem , Fishes , Hydrographic Basins , Environment/adverse effects , Seasons
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