Peces del oriente de Antioquia, Colombia

The eastern Antioquia region of Colombia's central mountain range, is characterize by steep altitudinal gradients and rich hydrological resources, with the majority of the drainage flowing into the middle Magdalena River. To compile a taxonomic list of the fish of eastern Antioquia, three sources of information were used: i) the revision of unpublished literature available in regional libraries, ii) revision icthyological collections with vouchers of the region, and iii) specific field work in unstudied aquatic systems. A total of 103 species belonging to eight orders and 25 families were found. The majority of the species found belonged to the families Characidae, Astroblepidae, Loricariidae and Trichomycteridae. Of the species collected, 32 are new records for the region and four are apparently new to science. Eight exotics species are introduced, now established in natural systems. With this study the total for the region increased considerably above the 49 species that had been previously reported in literature, much of which is from the 1980's. It is important to increase collecting efforts in the eastern Antioquia region, due to the underestimation of it's fish biodiversity

Peces del oriente de Antioquia, Colombia

The eastern Antioquia region of Colombia's central mountain range, is characterize by steep altitudinal gradients and rich hydrological resources, with the majority of the drainage flowing into the middle Magdalena River. To compile a taxonomic list of the fish of eastern Antioquia, three sources of information were used: i) the revision of unpublished literature available in regional libraries, ii) revision icthyological collections with vouchers of the region, and iii) specific field work in unstudied aquatic systems. A total of 103 species belonging to eight orders and 25 families were found. The majority of the species found belonged to the families Characidae, Astroblepidae, Loricariidae and Trichomycteridae. Of the species collected, 32 are new records for the region and four are apparently new to science. Eight exotics species are introduced, now established in natural systems. With this study the total for the region increased considerably above the 49 species that had been previously reported in literature, much of which is from the 1980's. It is important to increase collecting efforts in the eastern Antioquia region, due to the underestimation of it's fish biodiversity.La región del Oriente de Antioquia, ubicada en la cordillera Central de Colombia, se caracteriza por un amplio gradiente altitudinal, presentando gran riqueza hídrica, donde la mayoría de sus cuencas drenan hacia la cuenca media del río Magdalena. Con el objetivo de elaborar un listado taxonómico actualizado de los peces del Oriente de Antioquia, se usaron tres fuentes de información: i) revisión de la información disponible en bibliotecas regionales; ii) revisión de colecciones que tuvieran registros del área estudiada; iii) colectas puntuales en cuencas sin información previa. Se registran 103 especies pertenecientes a ocho órdenes y 25 familias. Las familias que presentaron la mayor riqueza fueron Characidae, Astroblepidae, Loricariidae y Trichomycteridae. De las especies colectadas 32 son registros nuevos para la región y aparentemente cuatro de ellas son nuevas especies. Ocho de las especies han sido introducidas y se encuentran en ambientes naturales. El número total de especies aumenta considerablemente el número registrado en la literatura recopilada (49 especies), siendo que la mayor parte de estos documentos fueron producidos en la década de 1980 a 1990. Es importante aumentar los muestreos en el oriente de Antioquia, pues su riqueza de peces ha sido subestimada

Primer registro de Lepidosiren paradoxa Fitzinger, 1837 en la cuenca del Orinoco (PNN El Tuparro, Vichada, Colombia)

The South American dipnoans are represented by a single species (Lepidosiren paradoxa) belonging to the Lepidosirenidae family (Nelson, 1994). These fishes are related to the African lungfish family Protopteridae that belong to the same order (Lepidosireniformes), and share with them a number of morphological characteristics and behavior. They tend to be considered authentic living fossils, as they are one evolutionary step between fish and amphibians. The Lepidosirenids have elongated bodies that may measure up to 1, 25 m; their fins are vascularized filaments; they have unpaired vomerine teeth, and lack bones in their cheeks, as well as in the premaxila and maxila (Arratia 2003).Los dipnoos suramericanos están representados por la familia Lepidosirenidae con una única especie, Lepidosiren paradoxa (Nelson 1994). Estos peces son emparentados con la familia Protopteridae, peces pulmonados africanos, que pertenecen al mismo orden (Lepidosireniformes), con los que comparten características morfológicas y hábitos en su comportamiento. Son considerados auténticos fósiles vivientes al ser un escalón evolutivo entre los peces y los anfibios. Los lepidosirenidos presentan cuerpos alargados que pueden alcanzar hasta 1,25 m de longitud; sus aletas son filamentos vacularizados, en la boca presentan dientes vomerianos impares y carecen de huesos en las mejillas al igual que la premaxila y maxila (Arratia 2003)

Checklist of the freshwater fishes of Colombia

Data derived from the literature supplemented by examination of specimens in collections show that 1435 species of native fishes live in the freshwaters of Colombia. These species represent 14 orders and 47 families. Orders with the largest numbers of species in the Colombian continental ichthyofauna are the Characiformes (637 species), Siluriformes (524 species), Perciformes (124 species), and Gymnotiformes (74 species), with the remaining 10 orders having from 1 to 35 species. At the family level, the Characidae has the greatest number of species (399 species), with this followed by the Loricariidae (166 species), Cichlidae (114 species), Pimelodidae (54 species), and Trichomycteridae (54 species); the remaining 42 families having 1 to 52 species. Present data indicate that 311 of the species occur solely at locations within Colombia. Continued descriptions of new species from the continental waters of Colombia demonstrate that the present total underestimates the species-level diversity of the ichthyofauna. The 1435 species living in Colombian freshwaters represent approximately 5% of all freshwater and marine fish species now recognized worldwide and approximately 29% of the freshwater fish species known to inhabit the drainages across the expanse from the southern border of Mexico through to Chile and Argentina. Various historical and ecological factors potentially contributing to the species-level richness of the Colombian freshwater fish fauna are discussed (e.g. geology, climate, physiography, water chemistry)

Peces de la cuenca del río Pauto, Orinoquia colombiana

This paper presents an updated list of the fishes of the Pauto river basin, Casanare. The update process was realized by collections in the field in the middle and lower part of the basin, revision of reference collections and secondary information available. A total of 182 species are recorded. Of these species, 60 are new records for the Pauto river basin. Only one species is included in the Red Book of freshwater fishes of Colombia. At the regional level, 52 species were identified as ornamental, and 24 are used as food; 8 species are exploited for both purposes. Based on the results, it is indispensable to re-evaluate the importance of the Pauto river basin as an area of interest for regional conservation

Peces de la cuenca del río Pauto, Orinoquia colombiana

This paper presents an updated list of the fishes of the Pauto river basin, Casanare. The update process was realized by collections in the field in the middle and lower part of the basin, revision of reference collections and secondary information available. A total of 182 species are recorded. Of these species, 60 are new records for the Pauto river basin. Only one species is included in the Red Book of freshwater fishes of Colombia. At the regional level, 52 species were identified as ornamental, and 24 are used as food; 8 species are exploited for both purposes. Based on the results, it is indispensable to re-evaluate the importance of the Pauto river basin as an area of interest for regional conservation.Se presenta un listado actualizado de los peces de la cuenca del río Pauto, departamento del Casanare (Colombia). La actualización se realizó mediante colectas en campo en la parte media y baja de la cuenca, así como la revisión de colecciones de referencia e información secundaria disponible. Se registran 182 especies. De éstas especies 60 corresponden a nuevos registros para la cuenca del río Pauto. Sólo una especie está incluida en el Libro Rojo de peces de agua dulce de Colombia. De las especies registradas 52 son consideras como especies ornamentales a nivel regional y 24 de importancia para consumo, ocho especies son explotadas con doble propósito. Basado en los resultados obtenidos es indispensable re-evaluar la importancia de la cuenca del río Pauto como área de interés para la conservación a nivel regional

Effects of aquatic vegetation on the spatial distribution of grundulus bogotensis, humboldt 1821 (characiformes: characidae)

G. bogotensis has a geographic distribution restricted to the Colombian Cundiboyacenseplateau, it is listed as near threatened, and research on its autoecology is scarce. Threecollections were made in 2006 in the Fúquene Lake, Cundinamarca, Colombia (5°27’ 55’’ N, 75° 46’ 19’’ W) to describe the habitats occupied by G. bogotensis and todetermine its vertical and horizontal distribution. Three sampling zones were selectedaccording to the type of dominant macrophyte (Eichornia crassipes, Schoenoplectussp. and Egeria densa). In each sampling zone two different cylindrical sampling traps(cloth and PVC) were placed at three depths: surface, mid-depth and bottom. Threereplicates were used for each depth and type of trap. Traps were exposed for 24 hoursand checked every 6 hours. In addition to the traps, sampling by electrofishing wasconducted in each sampling zone during every month. To characterize the study area,physical and chemical variables were analyzed and the structure of phytoplankton,zooplankton, periphyton, and macroinvertebrate communities was studied. Resultsshowed spatial differences on G. bogotensis habitat occupation and differences incaptures at each depth, which depend on the dominant type of aquatic vegetationand size of individual. We conclude that only cylindrical cloth traps are suitable toconduct population studies of G. bogotensi