Abstract Fishes from the coastal basins of the Mid-Northeastern Caatinga ecoregion (MNCE) were first sampled by the Stanford expedition at the beginning of the 20th century, and published by Edwin C. Starks in 1913. This material included specimens from the Papary lake (= Papari lagoon) in the lower portion of the Trairí river basin, draining towards the eastern coast of Rio Grande do Norte State. In 1941, Henry Fowler provided a broad taxonomic study of the freshwater fishes from northeastern Brazil, including material from the Papari lagoon, besides describing four species assigned to this locality. However, these previous surveys focused only in the lower portion of the Trairí river basin and might be incomplete. Given this framework, the present study aimed at perform a wide ichthyofaunal inventory of Trairí river basin and compare with previously surveys performed in the regions. In 2013 and 2014, four expeditions along the whole basin, including the Papari lagoon itself, resulted in 28 species of fishes belonging to 17 families and seven orders. At Papari lagoon area 16 species were registered whereas 26 and 18 species were recorded by Starks and Fowler’s studies, respectively. Considering all records, 50 species were documented in the basin with 14 (28%) new records, including Serrapinnus potiguar, whose distribution was extended to the south. Two species described by Fowler, Pimelodella papariae and Pseudancistrus papariae, were not found in this study or in any fish collection, and are only known from their type-material. These two species can be naturally rare, locally extinct, or there were inaccuracies in their type-locality. However, species of these genera are only found in larger basins of the MNCE, which drains to the north, corroborating the latter assumption. Although not being a definitive list, the recent extensive fish surveys conducted in the MNCE’s coastal basins are helping to elucidate species’ geographic distribution and little knowing taxonomic issues.
Abstract Mundaú river basin is located at Center-North Ceará State and occupies a total area of 2,227 km2, including Estuário do Rio Mundaú Environmental Protection Area. This study aimed to catalog the fishes of this basin. Collections were performed with active and passive gear in 35 sampling sites, between 2012 and 2014, in several habitats (main channels, streams, floodplains, permanent and temporary pools, ponds, and dams). A total of 2,545 specimens were collected, belonging to 55 species distributed in 10 orders, 31 families, and 50 genera; 30 of these are strictly freshwater species, and 25 estuarine-marine species. Three species (Hemigrammus guyanensis Gery, 1995, H. rodwayi Durbin, 1909 and Poecilia sarrafae Bragança & Costa, 2011) represent new records for the Mid-Northeastern Caatinga ecoregion. Besides, two cynolebiid species, Hypsolebias sp. and Anablepsoides cearensis (Costa & Vono, 2009), were found and the latter, currently classified as critically endangered, had its occurrence area widened.
Resumo A bacia do Rio Mundaú está situada no centro-norte do Estado do Ceará, e drena uma área de 2.227 km2 de Caatinga, incluindo a Área de Proteção Ambiental do Estuário do Rio Mundaú. Este estudo teve como objetivo realizar um inventário dos peixes desta bacia. As coletas foram realizadas com petrechos ativos e passivos, em 35 pontos amostrais entre 2012 e 2014 em diversos habitats (canal principal, córregos, alagados, poças permanentes e temporárias, lagoas e açudes) ao longo de toda a bacia. Um total de 2.545 indivíduos foram coletados, pertencentes a 55 espécies distribuídas em 10 ordens, 31 famílias e 50 gêneros; destas, 30 são estritamente de água doce e 25 estuarino-marinhas. Três espécies (Hemigrammus guyanensis Gery,1995, H. rodwayi Durbin, 1909 e Poecilia sarrafae Bragança & Costa, 2011) constituem novas ocorrências para a ecorregião do Nordeste Médio-Oriental. Além disso, foram registradas duas espécies de cinolebídeos, Hypsolebias sp. e Anablepsoides cearensis (Costa & Vono, 2009), a última classificada como criticamente ameaçada de extinção, teve sua área de ocorrência ampliada.