اثرات كاربرد سم تري كلروفن در رشد لارو و بچه ماهي سفيد درياي خزر

Effects of Application Trichlorfon Toxin With Different Concentrations on Growth of Larvae and Fry of Caspian Kutum, Rutilus Frisii Kutum

The research aims to investigate effects of application of trichlorfon toxin on different treatments with concentrations of the obsectine of this study was to investigate the effects of applicational trichlosfon toxin on different treatments using concentrations of0, 0.5, 1, 2, 3, 4, 5 and 10 ppm. Also effects of introduction offish larvae in different times after toxin spraying (24, 48 and 72 hours) on growth of the larvae and fry also studied. Vase incubators were used for three days larvae of Kutum, The experiment was conducted without use of flowing water. The results were tested statically using analysis of variance. A second set of experiments were run after vase experiment to look at the effects of trichlorfon on fish fry growth. The fries were placed in separate net compartments in earth ponds to grow. The statistical results of pond experiment showed that in the beginning of the period, trichlorfon toxin decreased growth of fish. Then growth was normal. Towards the end of the experiment, lower growth was observed in treatments having toxin with higher concentration of the toxin. Also statistical difference was significant for growth, as when the fish larvae were introduced into ponds after 72 hours after spraying, best growth was observed.