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EVALUATION OF HISTOPHYSIOLOGICAL ALTERATIONS IN RESPIRATORY PROCESS ASSOCIATE WITH FIPRONIL ADMINISTRATION IN EUROPEAN CHUB


MARIA CRISTINA PONEPAL, GHEORGHIŢA BRÎNZEA, ALINA PĂUNESCU
University of Pitesti, Faculty of Sciences, Departament of Natural Sciences, Targu din Vale No 1, Piteşti, Romania, e-mail: ponepal_maria@yahoo.com; georgeta_branzea@yahoo.com alina_paunescu@yahoo.com

Issue:

SCSB, Number 2, Volume XXXI

Section:

Volume 31, No. 2

Abstract:

This study was conducted to investigate the toxic effects of fipronil on Leuciscus cephalus (Linnaeus, 1758). Fipronil is a phenylpyrazole insecticide discovered and developed by Rhône-Poulenc between 1985 and 1987 and released to the market in 1996. The insecticide is widely used in agricultural management to control pests and it can be leached into aquatic ecosystems. Fipronil acts by targeting gamma-amino butyric acid (GABA) receptors and has a much higher affinity for insect than for vertebrate. The present study evaluates the changes of some important physiological indices (energy metabolism, respiratory rate, number of red blood cells) and histopathological gills tissues in Leuciscus cephalus exposed to the action of Fipronil insecticide under two concentrations (0.05 and 0.1 mg fipronil/L water). Fish adaptation to laboratory conditions was conducted for two weeks in glass aquariums with a capacity of 100 l, under natural photoperiodic conditions and the oxygen dissolved in water was not below 80% of the maximum possible at the respective temperature and pressure. Feeding during this period was “ad libitum” once a day; during the experiments fish were not fed to avoid the additional influence of the food factor, thus allowing a better interpretation and comparison of the results. The results were interpreted statistically using SPSS 13.0 program for Windows. The experimental samples regarded the presence of respiratory, hematological in Leuciscus cephalus intoxicated with Fipronil insecticide. The fipronil insecticide has changed the fish respiratory rhythm and stimulating rate of oxygen consumption. The number of erythrocytes in the fish individuals subjected for 14 days to 0.1 mg fipronil/L water was also significantly affected. Exposure of European chub to insecticide administered in water for 2 weeks determined installation of pathological changes in gills tissues.

Keywords:

gills, fipronil, energy metabolism, respiratory rate, red blood cells.

Code [ID]:

SCSB202202V31S01A0005 [0005449]

Note:

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