Bunocephalus hertzi, new species, is described from two tributaries of the upper Rio Paraná basin. Because type series B. larai (the only other species in basin) lost, a redescription also provided herein. and hertzi can be distinguished all its congeners, except minerim, by absence an epiphyseal bar (vs. present). From both presence 10 principal caudal-fin rays 9). differentiated longer coracoid process size (11.9–16.2% vs. 6.7–9.8% SL), shorter maxillary barbel (just reaching pectoral fin...

ABSTRACT The Paranapanema River is a major tributary of the upper Paraná river basin. Eleven hydropower dams regulate its main course, but no study has investigated fish diversity in these impoundments at basin-scale. present spatial patterns richness, composition, and abundance native (non-migratory migratory) non-native fishes cascade reservoirs along River. based on data collected from 34 independent studies conducted nine (47 samples). compilation recorded 161 species, being 111 (14 50...

This study aimed to evaluate the fish fauna composition and distribution in different environments, up- downstream Gavião Peixoto Dam, Jacaré-Guaçu River basin. Most of sampled ichthyofauna is autochthonous, majority species belongs orders Characiformes Siluriformes. The order comprised most specimens caught, Astyanax altiparanae being abundant species. All studied environments were characterized by massive occurrence accidental low similarity between their ichthyofauna. In general, a...

Aim: To evaluate the primary productivity of phytoplankton in Lake Monte Alegre, southeastern Brazil, and factors that influence its fluctuations, experiments were carried out lake mesocosm; Methods: Primary rates measured using 14 C technique, monthly lake, during one year, two mesocosm experiments, winter another summer.Other also analyzed temperature, dissolved oxygen, pH, electrical conductivity, chlorophyll-a, alkalinity, nutrients, nitrogen limitation.Hypotheses on grazing excretion by...

The composition and abundance of the fish assemblage were evaluated in ladder Ourinhos Dam, newest dam (closed 2005) cascade dams constructed on Paranapanema River. Samplings carried out three times a diel cycle, sampling periods, two warm season one cold 2008 - 2009. was closed emptied entire sampled identified. Most individuals released alive downstream dam. found compared with fauna reservoir sites, same period. Twenty seven species total 4682 caught ladder. Pimelodus maculatus only...

The conservation of diverse and well-distributed fish taxa, as the genus Leporinus, relies intrinsically on knowledge ecological attributes its representatives. Aiming to increase this knowledge, studies diet ecomorphology are ideal provide important information about species ecology. Thus, study aimed analyze aspects feeding ecology L. reticulatus, from upper Rio Juruena, Mato Grosso State, Brazil. specimens in different ontogenetic stages was compared, well their teeth morphology...

The value of clearing and staining whole organisms to study vertebrate anatomy is unquestionable. These methods have been developed for over a century leading protocols prepare triple-stained specimens differentiate between bones, cartilage, nerves. Despite their potential advance the field comparative anatomy, nerve-staining used by small number systematists in part because inconsistently successful preparations. Here, we report on several modifications current Sudan black B propose new...

Aim:The main objective of this study was to investigate the quality habitats for early life stages fish in Jacaré-Guaçu River, during dry phase; Methods: For assessing development stages, relative condition factor applied juveniles five species fishes, captured four different (reservoir, floodplain lake, river, and tributary).The were caught macrophytes littoral zone by a rectangular sieve, season 2008 2009; Results: The Astyanax altiparanae thrived similarly habitats, A. fasciatus,...

Streams contain an expressive fraction of the South American fish diversity, mostly composed small-sized, endemic, and rare species. Populational, reproductive, diet aspects Microglanis garavelloi were studied, aiming to make a wide characterization this species bumblebee catfish. This is endemic Upper Paraná River Basin, only representative genus in watershed. It littoral-dweller small rivers, with asymptotic length 34.1 mm population individuals 20-30 standard length. presents high...

A new species of Scleronema (Trichomycteridae) is described from the lowlands three coastal river basins in Atlantic Forest Santa Catarina state, Southern Brazil. Aspects anatomy, reproduction, diet, feeding behavior and habitat are discussed comparison with related taxa. The conservation status species, which currently faces several threats due to environmental impacts on its region occurrence, established. Based characteristics observed as well most congeners, phylogenetic position...

The genus Aphyodite has a complex taxonomic history. It was described as monotypic, and the only diagnosis provided "an Aphyocharax with scaled caudal fin". After description, revised twice, but some morphological inconsistences remained, pending proper analysis. Currently, is member of Aphyoditeinae can be distinguished from all other representatives this subfamily by having first infraorbital conspicuous sensory canal not reaching anterior edge bone. During revision genus, two new species...

Abstract Scientific collections constitute a valuable source for contributions to scientific research and the training of human resources in systematics, but also other areas biological knowledge. In this contribution, we intend discuss these advancements role played by FAPESP sponsoring them, as well general overview zoological São Paulo state. We aim stress importance need continuous logistic financial support from institutions agencies maintain develop unique repositories biodiversity....

The monotypic genus Atopomesus, a poorly known member of the family Characidae, is re-described. Atopomesus pachyodus endemic to Rio Negro basin, where it feeds on aquatic insect larvae, and seems occur mostly in riverine sand banks beaches. A. was originally described as Characidae subfamily Cheirodontinae, but has been considered an incertae sedis based relatively superficial studies its dentition external morphology. However, according morphological analyses presented herein, close...

Rio Santa Bárbara, a small tributary of the Sapucaí-Mirim, has undergone severe human intervention over past 80 years. We surveyed ichthyofauna this river, some surrounding lakes, and Potreiro, tributary. Four campaigns were carried out, 2 in dry season rainy season. found 920 specimens at 12 sites included 32 species belonging to 6 orders 16 families. The order Characiformes was be best represented our study, followed by Cichliformes Siluriformes. family Characidae most numerous, families...

Since its description, Axelrodia lindeae has always been referred to as morphologically distinct from the remaining species of Axelrodia, with some authors questioning monophyletic status genus. After a comprehensive analysis representatives new genus represented by A. type species, plus two additional is herein proposed. Besides unique color pattern, characterized conspicuous midlateral stripes, differentiated characid genera dentary tooth row, implanted internally, and presence...

The first report of Sartor (Anostomidae) and Tatia intermedia (Auchenipteridae) for the Upper Tapajós River Basin are presented here. is very rare on collections, reported only from Trombetas, Tocantins Xingu river basins. registered in upper reaches Araguaia, Tocantins, Xingu, Capim rivers, tributaries lower Amazon Brazil, northwards to Suriname coastal rivers Essequibo Guyana.

Abstract: Aim: As part of the remodeling an almost century-old dam, in Rio Jacaré-Guaçu, dredging and management macrophytes were carried out Gavião Peixoto Reservoir (São Paulo State, Brazil). Data for reservoir a river stretch upstream compared, evaluating effects procedures. Methods The fish fauna physical chemical factors studied during five years, before (2005-2006) after recovery procedures (2007-2009), once year, rainy season. Fishes caught by gill nets, 10 m long 1.5, 4, 6 cm-mesh...