SciELO - Scientific Electronic Library Online

vol.10 issue2Food-resource partitioning among fish species from a first-order stream in northwestern Paraná, BrazilEffects of stocking density on dispersal behavior of Brazilian freshwater dourado (Salminus brasiliensis) in a subtropical river headwater author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links


Neotropical Ichthyology

Print version ISSN 1679-6225


ESPINOLA, Luis Alberto; JULIO JUNIOR, Horácio Ferreira  and  BENEDITO, Evanilde. Invasive non-native species of fish in upper Paraná river Basin, Brazil: variations of caloric content in Cichla kelberi. Neotrop. ichthyol. [online]. 2012, vol.10, n.2, pp.401-408.  Epub May 10, 2012. ISSN 1679-6225.

The allocation of assimilated energy may be influenced by seasonal changes, growth, and reproductive cycle of fish, food consumption and environmental conditions. The objective of this research was to evaluate the energetic variations of Cichla kelberi in the upper Paraná River floodplain, analyzing the caloric content in muscles, gonadosomatic index (GSI), and the condition factor between assessed systems, sex, and stage of gonadal maturation. The results obtained in the present study permit assuring that this is a species that efficiently converts the resources of the environment into energy. Although presenting higher condition factor in the environment where there is a greater ease in getting food (Paraná subsystem), the energy identified in the muscles was the same in both subsystems. During the process of gonadal maturation there is optimization in energy accumulation in the muscles of females, before and after reproductive period, and somatic growth occurs significantly when the individual is not reproducing. Further detailed studies on ecological mechanisms influencing the success of the species, as the presence of competitors and preference for native preys, are needed to implement effective management measures aimed at preventing that the species proliferation in the environment is even more damaging to local biodiversity.

Keywords : Condition factor; Energetic density; Gonadal maturation; Paraná and Baía Rivers.

        · abstract in Portuguese     · text in English     · English ( pdf epdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License