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Abstract
The work aimed to detect the sensitivity of some aquatic organisms, belong to five classes, namely mosquitoes, daphnids, frogs, water snails, and fishes to three pesticides belong to three chemical pest control agents (the insecticide methomyl, the herbicide butachlor and the fungicide edifenophos.
The obtained results show that there was a wide range in sensitivity to the bioactivity of the three tested pesticids. Species, stage, instar, and age specificity took place in this respect. The two daphnid species water flea Daphnia magna and Moina australiensi revealed the highest sensitvity to the insecticide methomyl and the OP fungicide edifenophos (LC50 values ranged between 0.001 –0.34 ppm). On the other hand, the aquarium fish species (molly fish Poecilia sphenops, sword fish Poecilia latipinna and gup fish Xinophorus hallen) and M. australiehsi exhibited the highest sensitivity to the herbicide butachlor (LC50 values ranged between 0.24-0.91 ppm). The potencies of phototactic hehaviour were 8.3, 40 and 222.9 times that of the acute toxicity of methomyl, edifenophos, and butachlor, respectively. Beside this, the holding period is much shorter (whithin few seconds) in phototactic behaviour assay compared with 2 days in the acute toxicity test.
3- Morphologic activity of the acetinalide herbicide butachlor (Machete 50% EC) in the Egyptian toad B.regularis.