Effects of temperature and feeding frequency on the influence of cypermethrin in the gill tissue of zebra fish (Aphanius sophiae)

Cypermethrin is one of the most widely used insecticides. The remaining this toxinsin the environment may damage the ecosystem, especially fish populations and aquatic invertebrates. In the present study we were investigated the intraction of natural stressors such as temperature and feeding frequency with cypermethrin on the gill of zebre fish. Fishes in the two concentrations of zero (control) and 0.02 micrograms per liter cypermethrin and environmental variables temperature (16 ± 1 and 25 ± 1° C) and food (twicea day, every three days) for fourteendays in vitro condition were maintained. Hyperplasia of gill secondary lamella apical epithelial cells, mucous cell hyperplasia in primary lamella, epithelial lifting, bending secondary lamella, lamella epithelial scaling secondary, pilar cell hypertrophy, fusion, shortening the secondary lamella andaneurismare changes that were observed. Toxicology results showed that cypermethrin, temperature and feeding frequency have a significant effects on gill tissues destroyed (P<0.05). Cypermethrin and feeding frequency have a dierectly effect and temperature affect adversely (P<0.05).Use of this fish for cypermethrin assessment in aquatic systems affected by temperature and feeding frequency and should be considered.