Growth curve estimated through scale age rings and length of gonadal first maturation of Astyanax schubarti Britski, 1964 (Pisces, Osteichthyes, Characidae), in Ibitinga Reservoir, São Paulo State, Brazil

Authors

  • Maria Teresa Duarte GIAMAS Pesquisador Cientifico -  Seção de Biologia Aquática - Divisão de Pesca Interior - Instituto de Pesca - CPA /SAA
  • Ricardo Amaro dos SANTOS Pesquisador Cientifico -  Seção de Controle e Orientação de Pesca - Divisão de Pesca Interior - Instituto de Pesca - CPA /SAA
  • Harry VERMULM JUNIOR Biólogo -  Seção de Biologia Aquática- Divisão de Pesca Interior - Instituto de Pesca - CPA /SAA
  • Elmar Cardozo CAMPOS Pesquisador Cientifico -  Seção de Controle e Orientação de Pesca - Divisão de Pesca Interior - Instituto de Pesca - CPA /SAA
  • Jaime José Casari da CAMARA Pesquisador Cientifico -  Seção de Controle e Orientação de Pesca - Divisão de Pesca Interior - Instituto de Pesca - CPA /SAA

Keywords:

Astyanax schubarti, growth curve, scales lecture, total length in the first maturation, Ibitinga Reservoir

Abstract

For determining Astyanax schubarti Britski, 1964 growth curve, scales rings were examined according to WERDER and SOARES (1984) method. The scales (65) located on the area beneath dorsal fin were found to be the best for lecture. The relationship between age and body total length, of which the estimation was done by von Bertalanffy (1938) method, were found to be: 1st year - 82.66 mm; 2nd year - 105.97 mm and 3rd year - 123.68 mm, in males; 1st year - 75.66 mm; 2nd year - 102.88 mm; 3rd year - 124.19 mm; 4th year - 140.88 mm and 5th year - 153.94 mm, in females. Mean body total length during first gonadal maturation, when fishes are about two years old, was found to be 83.3 mm in males and 95.0 mm in females.

Published

2018-09-05

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