Stress in pacu exposed to ammonia in water

Revista Brasileira de Zootecnia

Janessa Sampaio De Abreu²  Fábio Resende Esteves¹  Elisabeth Criscuolo Urbinati¹ 

[1] ,UNESP Centro de Aquicultura Jaboticabal São Paulo ,Brasil

关键词: cortisol;    fish farming;    fish physiology;    Piaractus mesopotamicus;    plasmatic ammonia;    water quality;   

DOI  :  10.1590/S1516-35982012000700001

来源: SciELO

【 摘 要 】

The present study evaluated stress indicators in pacu exposed to ammonia in water under the following conditions: without NH4Cl (0.00 g/L); with 0.0078 g NH4Cl/L; and with 0.078 g NH4Cl/L (pH 8.3 and 27 ºC). After the salt dilution the water flow was interrupted and reestablished in 24 hours. Sampling occurred prior to the addition of NH4Cl (control) and after 12, 24 and 48 hours. Glycaemia increased only in fish with the highest salt concentration when compared with group control, regardless of time, and at 24 hours, regardless of treatment. Plasma ammonia, highest in fish exposed to the highest NH4Cl concentration, decreased progressively up to 48 hours. Plasma chloride only decreased in fish not exposed to salt when compared with control and osmolality increased after 24 hours. Hematocrit (Ht), number and volume of erythrocytes and hemoglobin did not change when NH4Cl was added; Ht decrease was reported after 12 hours, but it was not followed by the other blood parameters. The results show tolerance of the pacu to ammonia in the environment.

【 授权许可】

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