Toxicity of the herbicides 2,4-D, DEF, propanil and trifluralin to the Dungeness crab,Cancer magister

Abstract
Lethal and sublethal responses to the herbicides 2,4-D, DEF®, propanil, and trifluralin of various life history stages of the Dungeness crab,Cancer magister, were examined to estimate maximum acceptable toxicant concentrations (MATC) of each compound for this species. Zoeae were found, in long term tests, to be the most sensitive stage. Based on the experiments with this stage, MATCs were concluded to be >0.95, μg for DEF, ≥26, μg/L for trifluralin, ≥80, < 1,700μg/L for propanil, and < 1,000μg/L for the free acid form of 2,4-D.