TOXICITY OF THE HERBICIDES 2,4-D, DEF, PROPANIL AND TRIFLURALIN TO THE DUNGENESS CRAB, CANCER-MAGISTER

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, <6.9 μg for DEF, ≥26, <220 μg/L for trifluralin, ≥80, < 1,700 μg/L for propanil, and < 1,000 μg/L for the free acid form of 2,4-D. © 1979 Springer-Verlag New York Inc.