Respostas fisiológicas da tilápia-do-nilo e variáveis limnológicas após decomposição de macrófitas utilizando herbicida
Alternative title
Physiological responses of nile tilapia and water parameters after decomposition of macrophyte using herbicideAuthor
Date
2017-01-01Type
Access rights
Metadata
Show full item recordAbstract
Macrophytes are important for aquatic biocenosis, however under certain conditions it’s population can raise becoming a problem in reservoirs such as the Egeria densa. To control these plants CONAMA discuss for the use of chemicals, but feasibility and safety studies should be conducted to allow the use for such purpose. Thus the present study evaluated the effects of decomposition Egeria densa killed by the herbicide diquat on water quality variables and physiological responses of Nile tilapia. Thus, 176 tilapia was distributed in 16 tanks and submitted to four treatments (tilapia without macrophyte; tilapia and macrophyte; tilapia and macrophytes died by diquat and macrophytes died by freezing). The values of pH, temperature, dissolved oxygen, alkalinity and conductivity did not differ between treatments. However, it observed an increase in total ammonia and phosphorus and reduction of nitrite concentrations in treatment with macrophyte killed by the herbicide. Chlorophyll-a concentration did not differ between treatments, however, phaeophytin-a increased in water submitted to plants died by freezing. After 21 days of experiment, no differences were observed in blood glucose, cortisol, leukocytes, erythrocytes and hemoglobin. Thus, tilapia does not alter their physiological patterns after chronic exposure to decomposing macrophytes killed by diquat.
How to cite this document
Language
Grant number
