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Reproductive and population parameters of discus fish symphysodon aequifasciatu...
Rossoni, Felipe; Amadio, Sidinéia Aparecida; Ferreira, Efrem J.G.; Zuanon, JansenThe ornamental discus fish Symphysodon aequifasciatus Pellegrin, 1904, is a popular endemic cichlid species from the Amazon basin, however scientific information concerning biology and ecology in its natural habitat is scarce despite its importance on the international aquarium trade. In this study we evaluated reproductive parameters of S. aequifasciatus in natural habitat in Piagaçu-Purus Sustainable Developm...
Simultaneous abrupt shifts in hydrology and fish assemblage structure in a floo...
Röpke, Cristhiana Paula; Amadio, Sidinéia Aparecida; Zuanon, Jansen; Ferreira, Efrem J.G.; Deus, C. P.; Pires, Tiago H.S.; Winemiller, Kirk O.Combined effects of climate change and deforestation have altered precipitation patterns in the Amazon. This has led to changes in the frequency of extreme events of flood and drought in recent decades and in the magnitude of the annual flood pulse, a phenomenon that influences virtually all aspects of river-floodplain ecosystem dynamics. Analysis of long-term data revealed abrupt and synchronous changes in hyd...
Diet of five species of Hemiodontidae (Teleostei, Characiformes) in the area of...
Silva, Cylene C. da; Ferreira, Efrem J.G.; Deus, C. P.The diet of five species of Hemiodontidae (Hemiodus argenteus (Pellegrin, 1908), H. atranalis (Fowler, 1940), H. immaculatus (Kner, 1858), H. microlepis (Kner, 1858) e H. unimaculatus (Bloch, 1794)) from the area of influence of the Balbina Reservoir, Uatumã River, northern Brazil, was investigated. Fish were collected bimonthly from April 2005 to February 2007 in four places, two in the reservoir (upstream the...
Spawning areas, dispersion and microhabitats of fish larvae in the Anavilhanas ...
Oliveira, Edinbergh Caldas de; Ferreira, Efrem J.G.The abundance and distribution of ichthyoplankton and their relationships to current velocity, temperature, dissolved oxygen, pH and electrical conductivity of the water in the Anavilhanas Ecological Station, Negro River, Amazonas State, Brazil, were analyzed. Preferred microhabitats for spawning, dispersion and nursery were also verified. Sampling was undertaken during the falling water period of 2001 and the ...
Phylogenetic community structure: Temporal variation in fish assemblage
Santorelli, Sergio; Magnusson, William Ernest; Ferreira, Efrem J.G.; Caramaschi, Érica Pellegrini; Zuanon, Jansen; Amadio, Sidinéia AparecidaHypotheses about phylogenetic relationships among species allow inferences about the mechanisms that affect species coexistence. Nevertheless, most studies assume that phylogenetic patterns identified are stable over time. We used data on monthly samples of fish from a single lake over 10 years to show that the structure in phylogenetic assemblages varies over time and conclusions depend heavily on the time sca...
Patterns of energy allocation to reproduction in three Amazonian fish species
dos Santos, Rodrigo N.; Amadio, Sidinéia Aparecida; Ferreira, Efrem J.G.The study considered the influence of the hydrological cycle and gonadal development on the accumulation and use of energy in three fish species from an Amazonian flooded area. Fishes were sampled over a 24 hour period at monthly intervals between July 2004 and June 2005 using gillnets of different mesh sizes. Body cavity fat and gonadosomatic indices were determined, as well as energy content of gonads and mus...
Fishery and local ecological knowledge of the discus (Symphysodon aequifasciatu...
Rossoni, Felipe; Ferreira, Efrem J.G.; Zuanon, JansenThe discus fish (Symphysodon aequifasciatus, Pellegrin 1904), an endemic cichlid from the Amazon basin, is one of the most popular ornamental fish species in the world. However, there is little information available in the scientific literature on the exploitation of this species in its natural habitat. In this article we describe the small-scale discus fisheries activity in the Reserva de Desenvolvimento Suste...
Diet of Bryconops alburnoides and B. caudomaculatus (Osteichthyes: Characiforme...
Silva, Cylene C. da; Ferreira, Efrem J.G.; Deus, C. P.The study of fish diet and its interaction with the environment provides important data on ecology and behavior, as fish face varying environmental and food availability conditions. The aim of the present study was to determine the diet of Bryconops caudomaculatus and Bryconops alburnoides, as well as to assess its seasonal variation, within the area influenced by Balbina Hydroelectric Dam (BHD), in the Uatumã ...
The fish fauna of the Parque estadual do Cantão, Araguaia River, State of Tocan...
Ferreira, Efrem J.G.; Zuanon, Jansen; Santos, Geraldo Mendes dos; Amadio, Sidinéia AparecidaThe Parque Estadual do Cantão is a protected area in the Araguaia River. In a survey carried out during a complete hydrological cycle, 271 species of fish, belonging to 183 genera, 41 families and 12 orders were captured. Characidae was the most diverse family with 89 species (32.6% of the total), followed by Loricariidae with 23 species (8.4%) and Cichlidae with 21 species (7.7%), ten families were represented...
Diet and trophic structure of the fish assemblage in the mid-course of the Tele...
Dary, Euriz?ngela Pereira; Ferreira, Efrem J.G.; Zuanon, Jansen; Röpke, Cristhiana PaulaThis study was carried out in a section of the middle course of the Teles Pires River, a clear water river that drains ancient and highly eroded geological formations, and where five hydropower plants are planned or in construction. In this study we tested the hypothesis that local fish fauna is mainly sustained by autochthonous food resources, with modest changes in the trophic structure of fish assemblages al...