Nictemeral variations for pacu Caranha, Piaractus mesopotamicus (Holmberg, 1887) culture in single - phase

Brazilian Archives of Biology and Technology

Luiz Eduardo Guimarães De Sá Barreto²  Marco Antonio Igarashi¹  Carmino Hayashi¹ 

[1] ,Instituto EmaterCuritiba PR ,Brasil

关键词: fish;    grow-out;    rearing;    environment;   

DOI  :  10.1590/S1516-89132010000400017

来源: SciELO

【 摘 要 】

Studies related to nictemeral variation were executed in a fish growing pond, during all the seasons of the year, collecting data for dissolved oxygen; temperature; pH and electrical conductivity at the feeding channel on pond's surface, bottom and at streamlet bed. The results showed that Autumn was the season which had the lowest values of water temperature, the interval points, during Spring time, had superior average values of temperature when compared to the ones that were observed at external points. The lowest and highest index of pH were during Autumn season. The electrical conductivity didn't show significant differences during Autumn season. The samples obtained from the streamlet had very high significant differences with the samples of fish pond inner part, showing that there was an influence on external environment from the effluent which came from the inner part of the fish pond on limnology variables.

【 授权许可】

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