Ampliación de la distribución de Brycon dentex (Characiformes: Characidae) y Hamuelopsis elongatus (Perciformes: Heamulidae) en Ecuador

The fishes Brycon dentex and Hamuelopsis elongatus were collected for the first time in the Santiago-Cayapas ictiohidrographic zone, at the Mira and Camumbi rivers, River Mira basin, Tobar Donoso area, province of Carchi, Ecuador. Previous records of the species were from the Esmeraldas and Intertidal ictiohidrographic zones, respectively.Los peces Brycon dentex y Hamuelopsis elongatus fueron colectados por primera vez en la zona ictiohidrográfica de Santiago-Cayapas, en los ríos Mira y Camumbi, cuenca fluvial del río Mira, parroquia Tobar Donoso, provincia del Carchi, Ecuador. Los registros previos de estas especies venían de las zonas ictiohidrográficas Esmeraldas e Intermareal, respectivamente

Leucismo en Astroblepus ubidiai (Pellegrin 1931)(Siluriformes: Astroblepidae), de la provincia de Imbabura,Ecuador

The leucism is an aberration in pigmentation, resulting from a genetic abnormality and occurs in all vertebrate groups in which the fish are included. In Ecuador it has not reported such anomalies in fish. Is presented for the first time a case of partial leucism in an individual of Andean Catfish (Astroblepidae), observed in a spring located near the Lake San Pablo Canton Otavalo, Imbabura Province, Ecuador.El leucismo es una aberración en la pigmentación, producto de una anomalía genética y se presenta en todos los grupos de vertebrados incluyendo los peces. En Ecuador no se ha reportado este tipo de anomalía en peces. Se presenta por primera vez un caso de leucismo parcial, en un individuo de Astroblepus ubidiai (Astroblepidae), observado en un manantial ubicado cerca del lago San Pablo del cantón Otavalo, cuenca del río Mira, provincia de Imbabura, Ecuador

Análisis de producción gonadal del pez Grundulus quitoensis Román-Valencia, Ruiz-C. y Barriga, 2005 (Characiformes: Characidae) en la laguna altoandina “El Voladero” provincia El Carchi, Ecuador

Relative fecundity in fishes is the estimated number of oocytes of a female during spawning. This aspect was investigated in Grundulus quitoensis topotypic specimens from the "El Voladero", a high Andean lake in Ecuador. Gonad maturation stages (mature and immature) were identified by means of direct observation, subsequently, the relative fertility (FRP) as function of the weight and the total lenght (TL) were calculated.La fecundidad relativa en peces es la estimación de la cantidad de ovocitos de una hembra por desove. Este aspecto se investigó en especímenes topotipos de Grundulus quitoensis de la laguna altoandina El Voladero, Ecuador. Se identificó el estadio de madurez gonadal (maduro e inmaduro) a través de la observación directa, se calculó la fecundidad relativa al peso (FRP) y a la longitud total (LT). Las hembras estudiadas tuvieron en promedio una LT de 63,9 mm. El rango de ovocitos varió entre 75 y 716 por hembra y en total se contaron 5691 ovocitos para 16 hembras. El PT varió entre 0,5 g y 4,7 g; mientras que la LT varió entre 36,7 mm a 63,9 mm. La fecundidad relativa se observó comprendida entre 1,6 y 14,3 ovocitos por mm de LT del animal (X ̅= 6,9 ± 3,6 mm-1) y entre 47,2 y 319,1 ovocitos por g de peso total (X ̅= 148,9 ± 74,9 g-1). Es importante conocer el ciclo de vida e historia natural de una especie, porque contribuyen al conocimiento ecológico de los peces que habitan las lagunas altoandinas, como es el caso del estudio aquí desarrollado en G. quitoensis

Análisis de producción gonadal del pez Grundulus quitoensis Román-Valencia, Ruiz-C. y Barriga, 2005 (Characiformes: Characidae) en la laguna altoandina “El Voladero” provincia El Carchi, Ecuador

La fecundidad relativa en peces es la estimación de la cantidad de ovocitos de una hembra por desove. Este aspecto se investigó en especímenes topotipos de Grundulus quitoensis de la laguna altoandina El Voladero, Ecuador. Se identificó el estadio de madurez gonadal (maduro e inmaduro) a través de la observación directa, se calculó la fecundidad relativa al peso (FRP) y a la longitud total (LT). Las hembras estudiadas tuvieron en promedio una LT de 63,9 mm. El rango de ovocitos varió entre 75 y 716 por hembra y en total se contaron 5691 ovocitos para 16 hembras. El PT varió entre 0,5 g y 4,7 g; mientras que la LT varió entre 36,7 mm a 63,9 mm. La fecundidad relativa se observó comprendida entre 1,6 y 14,3 ovocitos por mm de LT del animal (X ̅= 6,9 ± 3,6 mm-1) y entre 47,2 y 319,1 ovocitos por g de peso total (X ̅= 148,9 ± 74,9 g-1). Es importante conocer el ciclo de vida e historia natural de una especie, porque contribuyen al conocimiento ecológico de los peces que habitan las lagunas altoandinas, como es el caso del estudio aquí desarrollado en G. quitoensis

Range expansion of the genus Sicydium (Teleostei: Gobiidae) to coastal mountain streams of southwestern Ecuador and possibly northwestern Peru

We report collections of several specimens of Sicydium in 2013 and 2014 from the Jubones and Santa Rosa Rivers in southwestern Ecuador. These collections substantially expand the known range of the genus southward. The specimens are tentatively identified as Sicydium cf. rosenbergii based on their morphology. Small differences in morphology among specimens from the two rivers are noted, as are discrepancies with the type description. A museum database search uncovered two additional records of the genus south of their previously recognized range including one record from northwestern Peru

Genetic identification of three CITES-listed sharks using a paper-based Lab-on-a-Chip (LOC)

Threatened shark species are caught in large numbers by artisanal and commercial fisheries and traded globally. Monitoring both which shark species are caught and sold in fisheries, and the export of CITES-restricted products, are essential in reducing illegal fishing. Current methods for species identification rely on visual examination by experts or DNA barcoding techniques requiring specialist laboratory facilities and trained personnel. The need for specialist equipment and/or input from experts means many markets are currently not monitored. We have developed a paper-based Lab-on-a-Chip (LOC) to facilitate identification of three threatened and CITES-listed sharks, bigeye thresher (Alopias superciliosus), pelagic thresher (A. pelagicus) and shortfin mako shark (Isurus oxyrinchus) at market source. DNA was successfully extracted from shark meat and fin samples and combined with DNA amplification and visualisation using Loop Mediated Isothermal Amplification (LAMP) on the LOC. This resulted in the successful identification of the target species of sharks in under an hour, with a working positive and negative control. The LOC provided a simple “yes” or “no” result via a colour change from pink to yellow when one of the target species was present. The LOC serves as proof-of-concept (PoC) for field-based species identification as it does not require specialist facilities. It can be used by non-scientifically trained personnel, especially in areas where there are suspected high frequencies of mislabelling or for the identification of dried shark fins in seizures

A database of freshwater fish species of the Amazon Basin

The Amazon Basin is an unquestionable biodiversity hotspot, containing the highest freshwater biodiversity on earth and facing off a recent increase in anthropogenic threats. The current knowledge on the spatial distribution of the freshwater fish species is greatly deficient in this basin, preventing a comprehensive understanding of this hyper-diverse ecosystem as a whole. Filling this gap was the priority of a transnational collaborative project, i.e. the AmazonFish project - https://www.amazon-fish.com/. Relying on the outputs of this project, we provide the most complete fish species distribution records covering the whole Amazon drainage. The database, including 2,406 validated freshwater native fish species, 232,936 georeferenced records, results from an extensive survey of species distribution including 590 different sources (e.g. published articles, grey literature, online biodiversity databases and scientific collections from museums and universities worldwide) and field expeditions conducted during the project. This database, delivered at both georeferenced localities (21,500 localities) and sub-drainages grains (144 units), represents a highly valuable source of information for further studies on freshwater fish biodiversity, biogeography and conservation

Leucism in <em>Astroblepus ubidiai<em> (Pellegrin 1931) (Siluriformes: Astroblepidae), in Imbabura Province, Ecuador

The leucism is an aberration in pigmentation, resulting from a genetic abnormality and occurs in all vertebrate groups in which the fish are included. In Ecuador it has not reported such anomalies in fish. Is presented for the first time a case of partial leucism in an individual of Andean Catfish (Astroblepidae), observed in a spring located near the Lake San Pablo Canton Otavalo, Imbabura Province, Ecuador

Leucismo en Astroblepus ubidiai (Pellegrin 1931; Astroblepidae: Siluriformes), de la provincia de Imbabura, Ecuador

The leucismo is an aberration in pigmentation, resulting from a genetic abnormality and occurs in all vertebrate groups in which the fish are included. In Ecuador, it has not reported such anomalies in fish. Is presented for the first time a case of partial leucismo in an individual of Andean Catfish (Astroblepidae), observed in a spring located near the Lake San Pablo Canton Otavalo, Imbabura Province, Ecuador.El leucismo es una aberración en la pigmentación, producto de una anomalía genética y se presenta en todos los grupos de vertebrados incluyendo los peces. En Ecuador, no se ha reportado este tipo de anomalía en peces. Se presenta por primera vez un caso de leucismo parcial, en un individuo de Astroblepus ubidiai (Astroblepidae), observado en un manantial ubicado cerca del lago San Pablo del cantón Otavalo, cuenca del río Mira, provincia de Imbabura, Ecuador

Species and geographic distribution of Mylossoma Eigenmann & Kennedy, 1903 from Ecuador

A review of the species of the genus Mylossoma Eigenmann & Kennedy, 1903 found in the Ecuadorian Cis-Andean region was conducted. Two species were recognized: M. albiscopum (Cope, 1872) from the Putumayo, Napo, and Tigre river basins and M. aureum (Agassiz, 1829) from the Napo river basin. A map of geographical distribution and radiographs for both species are provided. Historical records of M. duriventre (Cuvier, 1818) were not confirmed in this geographical distribution