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Ecology of Cichla (Cichlidae) in Two Blackwater Rivers of Southern Venezuela

Examination of gonads and sizes of intraovarian oocytes indicated that reproduction by all five populations probably is initiated during the late low water period and may continue into the flooding period.
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Fish and aquatic habitat conservation in South America: a continental overview with emphasis on neotropical systems.

In this review, the main river basins of South America, together with key aquatic habitats (mangrove-fringed estuaries of the tropical humid, tropical semi-arid and subtropical regions) are analysed in terms of their characteristics and main concerns.
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Molecular phylogeny of the live-bearing fish genus Poecilia (Cyprinodontiformes: Poeciliidae).

The complete NADH Dehydrogenase Subunit 2 (ND2) mitochondrial gene is sequenced in representatives of the major divisions of the genus Poecilia in order to examine the phylogenetic relationships within the genus.
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Age structure and growth of peacock cichlids from rivers and reservoirs of Venezuela

The present results indicate that the annual cycle or tropical wet/dry seasonality promotes reproductive seasonality in Cichla, and populations living in relatively aseasonal reservoir environments may have several spawns per year.
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Temporal patterns of resource partitioning among Cichla species in a Venezuelan blackwater river.

Together, the three Cichla species consume a wide spectrum of prey from a diverse fish assemblage, but prey are subdivided based on habitat, prey type, and season.
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Fish assemblages of the Casiquiare River, a corridor and zoogeographical filter for dispersal between the Orinoco and Amazon basins

Aim  The aim of this study was to determine whether the Casiquiare River functions as a free dispersal corridor or as a partial barrier (i.e. filter) for the interchange of fish species of the…
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Ecology of the coporo, Prochilodus mariae (Characiformes, Prochilodontidae), and status of annual migrations in western Venezuela

Deforestation, overfishing, pollution, and construction of dams have severely impacted migratory fishes of western Venezuela. The coporo, Prochilodus mariae (Prochilodontidae), has supported the…
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Limnology of Andean piedmont rivers of Venezuela

Abstract We sampled 6 rivers of the piedmont region of Venezuela during the dry seasons of 1997 and 1998 to compare physical, chemical, and biological features and evaluate the influence of natural…
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Food habits of piranhas in the low llanos of Venezuela

Considerable diet overlap among different piranha species in the same size dasses suggests that plentiful food resources are not limiting, and these savanna piranhas do not depend on fruits and seeds as has been reported for Piranhas in flooded tropical rain forests.
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Mind the (information) gap: the importance of exploration and discovery for assessing conservation priorities for freshwater fish

Biodiversity conservation often is aimed at areas of high species richness and endemism. Our understanding of freshwater fish diversity in the Neotropics is biased by lack of exploration within…
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