Cordylancistrus santarosensis is described based on five specimens from the Río Santa Rosa, Ecuador. This species can be distinguished from all other members of the Chaetostoma group by having plates on the tip of the snout (except for a central region at the extreme anterior edge), but lacking plates laterally on the head. This snout plating condition is intermediate between the fully plated s...

Geographic isolation is suggested to be among the most important processes in the generation of cichlid fish diversity in East Africa's Great Lakes, both through isolation by distance and fluctuating connectivity caused by changing lake levels. However, even broad scale phylogeographic patterns are currently unknown in many non-cichlid littoral taxa from these systems. To begin to address this,...

The current status of the inland waters ichthyofauna Iran is revised and updated. A total 292 fish species belong to 3 classes, 24 orders, 36 families 106 genera inhabit Iran. Among these, 29 (9.9%) are exotic 102 (35%) endemic. Orders with largest numbers in Cypriniformes (182 species) followed by Gobiiformes (30 species), Cyprinodontiformes (15 Siluriformes (12 Clupeiformes (10 Acipenseriform...

El presente estudio reporta la diversidad ictiológica de quebrada Mayapo en base a material depositado Colección Ictiológica del Museo Historia Natural Universidad Nacional Mayor San Marcos (MUSM), los años 2005, 2009 y 2010, proveniente 30 puntos muestreo afluentes ubicados entre 256 557 m altitud. Se identificaron 60 especies agrupadas 39 géneros, 16 familias cuatro órdenes, siendo órdenes Ch...

Darrang district is located at 26°9′N 91°45'E to 26°45' N 92°22' E covering geographical area of 1585 sq.km (Approximately) having population 9, 28, 500 (As per 2011 census). The present investigation was carried out in the Mailata-Diplinga beel during 2021-22 document icththyo-faunal diversity and conservation status fishes. study reveals presence 36 species belonging 28 genera, 7 orders 17 fa...

Effects of short-term administration of corticosterone and cortisol on plasma levels of thyroid hormones, gonado-somatic index and testicular histology have been reported in catfish, Clarias gariepinus during different phases of its breeding cycle. Corticosterone administration had no significant effect on plasma levels of T4, T3 and T3/T4 ratio, irrespective of doses and phases of breeding cyc...