SciELO - Scientific Electronic Library Online

 
vol.10 número2Invasive non-native species of fish in upper Paraná river Basin, Brazil: variations of caloric content in Cichla kelberiMorphological diversity of fish along the rio das Velhas, Minas Gerais, Brazil índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Indicadores

Links relacionados

Compartilhar


Neotropical Ichthyology

versão impressa ISSN 1679-6225

Resumo

SCHULZ, Uwe Horst  e  LEAL, Mateus Evangelista. Effects of stocking density on dispersal behavior of Brazilian freshwater dourado (Salminus brasiliensis) in a subtropical river headwater. Neotrop. ichthyol. [online]. 2012, vol.10, n.2, pp.409-415.  Epub 10-Maio-2012. ISSN 1679-6225.  https://doi.org/10.1590/S1679-62252012005000001.

Juvenile freshwater dourados (Salminus brasiliensis Cuvier) were stocked in two batches of different size (61 and 133 individuals) with a time lag of 41 days in the headwaters of the Sinos River. A subsample of 25 fish was radio-tagged. Released juveniles displayed a density dependent dispersal pattern. During the first ten days mean covered distance of tagged batch 1 individuals (low density) was approximately 24 m d-1, while batch 2 individuals (high density) moved 296 m d-1. Activity of batch 1 fish increased after the release of batch 2 and remained high (459 m d-1) until 90 days. Activity of batch 2 fish during this period was in same range. After this period, activity levels of both batches decreased to about 60 m d-1. Increased movements in higher density condition are seen as a result of interspecific competition. The mean covered distances per day remained high until stocked individuals become established in their new habitat.

Palavras-chave : Density dependence; Dispersal; Intraspecific competition; Movements.

        · resumo em Português     · texto em Inglês     · Inglês ( pdf )

 

Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons