• S. Satyanarayana
• Dr. G. SrinivasaRao
• Dr. N.GopalaRao

Toxicity of a synthetic pyrethroid permethrin, the technical grade (TG) and 25% EC is determined by employing both the static and continuous flow through systemsin the fresh water fish Ctenopharyngodon idella (grass carp). The LC50 values for 24, 48, 72 and 96 hours of the technical grade are 0.261 µg/L, 0.168 µg/L, 0.114 µg/L and 0.078ug/L respectively and for 25% EC, 0.523 µg/L, 0.332 µg/L, 0.220 µg/L and 0.156 µg/L respectively in the static system. Similarly in the continuous flow through systems (CFTS) the values of technical grade (TG) for 24, 48, 72 and 96 hrs are 0.229 µg/L, 0.131 µg/L, 0.083 µg/L and 0.021 respectively and for 25% EC 0.376µg/L, 0.248 µg/L, 0.141 µg/L and 0.122 µg/L respectively. The static values are higher to CFTS values and 25% EC the commercial formulation is also sufficiently toxic in action and these are duration and concentration reliant. The morphological changes of the experimented fish, in their behavior, that are observed while exposing them to both the toxicants which are also reported here that can be served as indices or indicators of the toxic stress.

Ctenopharyngodon idella, synthetic pyrethroid, type I, Permethrin, Technical Grade (TG), Emulsifiable Concentration (EC), Static and Continuous flow through systems.

"TOXICITY OF PERMETHRIN, A SYNTHETIC PYRETHROID TO THE FRESH WATER FISH CTENOPHARYNGODON IDELLA (GRASS CARP)", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 6, page no.353-360, June 2019, Available :http://www.jetir.org/papers/JETIR1907510.pdf

"TOXICITY OF PERMETHRIN, A SYNTHETIC PYRETHROID TO THE FRESH WATER FISH CTENOPHARYNGODON IDELLA (GRASS CARP)", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 6, page no. pp353-360, June 2019, Available at : http://www.jetir.org/papers/JETIR1907510.pdf