Fish fauna of the lower course of the Parnaíba river, northeastern Brazil

Filipe Augusto Gonçalves de Melo, Paulo Andreas Buckup, Telton Pedro Anselmo Ramos, Ana Karoline do Nascimento Souza, Crislane Maria Araújo Silva, Teresa Cristina Costa, Alessandra Ribeiro Torres

Resumo


RESUMO: (Ictiofauna do baixo curso do rio Parnaíba, nordeste do Brasil). A ictiofauna do baixo curso do rio Parnaíba foi investigada através de coletas periódicas. Trinta e duas amostragens georeferenciadas foram realizadas: 11 no curso principal do rio Parnaíba, duas no rio Poti, 14 no rio Longá, duas no rio Piracuruca e três no rio Igaraçu. As amostragens foram realizadas durante os anos de 2012 a 2014 com o uso de rede de arrasto, tarrafa, rede de emalhar e puçá, capturando-se 2.732 espécimes pertencentes a 65 espécies distribuídas em 24 famílias e 11 ordens. O estudo demonstrou grande similaridade ictiofaunística entre o baixo rio Parnaíba e a Bacia Amazônica. Uma espécie não descrita, três endêmicas e uma introduzida foram registradas na área de estudo. As ordens predominantes foram Characiformes (34 espécies), Siluriformes (13) e Cichliformes (7). Characidae foi a família com maior número de espécies (18), seguida de Cichlidae (7) e Loricariidae (7). Oito espécies tiveram grande abundância e representaram 62,7% do material coletado (Astyanax lacustris, Curimatella immaculata, Hemigrammus rodwayi, Hyphessobrycon sp., Jupiaba polylepis, Psellogrammus kennedyi, Serrapinnus piaba e Tetragonopterus argenteus). Astyanax lacustris e Hemigrammus rodwayi tiveram sua área de distribuição conhecida ampliada para bacia do rio Parnaíba. Foram registradas cinco espécies de ambiente estuarino: Anchovia surinamensis, Anchoviella guianensis, Awaous tajasica, Lycengraulis batesii e Microphis lineatus. The fish fauna of the lower Parnaíba river was investigated through systematic collection. Thirty-two geo-referenced sites were sampled in the lower Parnaíba: 11 in the Parnaíba river, two in the Poti river, 14 in the Longa river, three in Igaraçu river, and two in Piracuruca river. Sampling was performed during the years 2012 to 2014, using four different type of fishing nets: beach seine, cast net, gillnet and hand net. A total 2,682 specimens which belong to 66 species distributed in 24 families and nine orders were captured. These species demonstrate great ichthyofaunistic similarity between the lower Parnaíba and the Amazon basin. One possibly undescribed, three endemic, and one introduced species were recorded in the area. We report five species from marine or brackish-water habitats: Anchovia surinamensis, Anchoviella guianensis, Lycengraulis batesii, Syngnathus sp. and Awaous tajasica. The predominant orders were Characiformes (35 species), Siluriformes (13) and Perciformes (10). At the family level the Characidae had the greatest number of species (18), followed by Cichlidae (7) and Loricariidae (7). Eight species had high abundance and represented 60.5% of all collected specimens (Astyanax lacustris, Curimatella immaculata, Hemigrammus rodwayi, Hyphessobrycon sp, Jupiaba polylepis, Psellogrammus kennedyi, Serrapinnus piaba and Tetragonopterus argenteus). Astyanax lacustris and Hemigrammus rodwayi have their geographic ranges expanded to the Parnaíba river.

ABSTRACT: The fish fauna of the lower Parnaíba river was investigated through periodic sampling. Thirty-two geo-referenced samples were performed: 11 in the main course of Parnaíba river, two in the Poti river, 14 in the Longá river, three in Igaraçu river, and two in Piracuruca river. Sampling was performed during the years 2012 to 2014, using beach seine, cast net, gillnet, and hand net, resulting in 2,732 captured specimens belonging to 65 species in 24 families and 11 orders.  The study demonstrated great ichthyofaunistic similarity between the lower Parnaíba and the Amazon basin. One  undescribed, three endemic, and one introduced species were recorded in the area. The predominant orders were Characiformes (34 species), Siluriformes (13), and Cichliformes (7). Characidae was the family with the greatest number of species (15), followed by Cichlidae (7), and Loricariidae (6). Eight species had high abundance and represented 62.7% of captured specimens (Astyanax lacustris, Curimatella immaculata, Hemigrammus rodwayi, Hyphessobrycon sp, Jupiaba polylepis, Psellogrammus kennedyi, Serrapinnus piaba, and Tetragonopterus argenteus). Astyanax lacustris and Hemigrammus rodwayi had their known geographic ranges expanded to the Parnaíba river. We report five species from estuarine environments: Anchovia surinamensis, Anchoviella guianensis, Lycengraulis batesii, Microphis lineatus, and Awaous tajasica.

 


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