Abstract |
Massive kills of fish have occurred in the lower Mississippi and Atchafalaya Rivers and the Gulf of Mexico, in the fall and winter months every year since 1960, and were particularly severe in the winter of 1963-64. Experiments showed that endrin was present in lethal amounts in the blood of dead fish taken from the Mississippi River. As a result of these experiments and related investigations, endrin appears to have been the most likely cause of the fish kills in 1963. Because of the many similarities involved, it is quite probable that the kills in earlier years were caused by the same chemical. |