THE EFFECTS OF DIFFERENT CONCENTRATIONS OF TRICHLORFON TOXIN ON THE SURVIVAL AND GROWTH OF CASPIAN KUTUM, RUTILUS FRISIIKUTUM

摘要

Trichlorfon is an organophosphate pesticide. In concentration of 1 to 5 ppm it is used in selective growth of zooplanktons such as rotifera that is a desired food for larvae of kutum. It is used to fight rotifera enemies such as Cyclops (Meister, 1992). Three to seven days old larvae of kutum, Rutilusfrisii kutum, are introduced, 24 to 48 h after poison spraying(Faridpak, 1986).