Fish, nerve agent toxicity

Other Lethal Agents. There are a number of substances, many found in nature, which are known to be more toxic than nerve agents (6). None has been weaponized. Examples of these toxic natural products include shellfish poison, isolated from toxic clams puffer fish poison, isolated from the viscera of the puffer fish the active principle of curare "heart poisons" of the digitaUs type the active principle of the sea cucumber active principles of snake venom and the protein ricin, obtained from castor beans (See Castor oil). 

All of the parent nerve agents are highly toxic to aquatic organisms (Munro et al, 1999). Acute ecotoxicity information was found only for the degradation product, MPA. The 48- to 96-h LC50 values of several thousand mg/1 for daphnids and fish indicates that MPA has low environmental toxicity. 

---