(Season of reproductionin Rana catesbeiana Shaw, 1802 raised in commercial outdoor facility and influence of climatic factors on the number of spawning masses)

Authors

  • Dorival FONTANELLO Pesquisador Cientí­­fico - Seção de Aquicultura - Divisão de Pesca Interior - Instituto de Pesca
  • Henrique ARRUDA SOARES Biologista - Seção de Aquicultura - Divisão de Pesca Interior - Instituto de Pesca
  • José MANDELLI JR Médico - Seção de Aquicultura - Divisão de Pesca Interior - Instituto de Pesca
  • Luis Edésio SANTOS Pesquisador Cientí­­fico - Seção de Aquicultura - Divisão de Pesca Interior - Instituto de Pesca
  • Luiz Antonio PENTEADO Pesquisador Cientí­­fico - Seção de Aquicultura - Divisão de Pesca Interior - Instituto de Pesca
  • Benedicto do Espírito Santo de CAMPOS Pesquisador Cientí­­fico - Seção de Estatí­­stica e Técnica Experimental - Divisão de Técnica Básica e Auxiliar do Instituto de Zootecnia
  • José Marques dos REIS Pesquisador Cientí­­fico - Seção de Aquicultura - Divisão de Pesca Interior - Instituto de Pesca

Keywords:

NíO CONSTA

Abstract

The reproductive period and the effect of climatic factors upon the daily number of spawning masses were determined on 2000 couples of Rana catesbeiana raised in commercial frog farm from 1978 to 1979 and from 1981 to 1982. The reproduction takes place in spring and summer, being the number of pawning masses (Y) influenced by the temperature of the air (T), photoperiod (F), insolation (I) and solar radiation (R). In the statistical interpretation of the data, an analysis of variance with multiple regression for the linear, quadratic and cubic effects of the climatic factors on the number of daily spawning masses was carried out and the significance level was 0.05 probability. Statistical analysis included besides these studied effects the pluviometric index and the relative humidity to do the multiple regression analysis using least squares means method. The obtained equation is:

Y = - 1,040.387 + 4.0347 F í  0.005429 F2 + 0.00000243 F3+0.01426 I + 4.50872 T í  0.096315 T2 í  0.021627 R

The species Rana catesbeiana Shaw, 1802 shows seasonal reproduction, occurring from September through February in the studied region. Also, the spawning frequency is influenced by the photoperiod, insolation, air temperature, and solar radiation, being the temperature the most important factor of them all.

Published

2018-06-21

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