Food’s dynamics and habits of Oligosarcus jenynssi (Gí­Å“NTHER, 1864) in Caconde Lagoon, Rio Grande do Sul, Brazil (Teleostei, Characidae)

Authors

  • Sandra Maria HARTZ Professor Adjunto - Departamento de Ecologia -  Instituto de Biociência /UFRGS http://orcid.org/0000-0002-6536-1072
  • Alexandre MARTINS MARTINS Estagiário - Departamento de Ecologia-  Instituto de Biociência /UFRGS
  • Geraldo BARBIERI Pesquisador Cientí­­fico - Seção de Controle e Orientação da Pesca - Divisão de Pesca Interior Instituto de Pesca - CPA/SAA

Keywords:

Oligosarcus jenynsii, diet, food's dynamics, coastal plain, Rio Grande do Sul

Abstract

This study was designed to obtain information regarding to aspects of food's dynamics and habits of Oligosarcus jenynsii at Caconde Lagoon, RS, Brazil. The specimens (356 females and 311 males) were collected between Jul./1992 and May/94. The analyses were performed based on variation on the repletion and hepatosomatic indexes and on the condition factor. Stomach contents were analized by frequency of occurrence and by importance food index for each component. The specimens were better fed before and after the reproductive period. In the same period the highest values of the hepatosomatic index occurred. The condition factor was influenced by gonadal weight, mainly in females. The species presented food habit carnivorous, with having a tendency to piscivory.

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Published

2018-09-15

Issue

Vol. 23 No. único (1996): BOLETIM DO INSTITUTO DE PESCA

Section

Scientific Article