There have been many findings where fish have red eyes caused by dynamite fishing. The chemicals contained inside the dynamite can often contaminate the waters of the oceans and the marine life within them. These toxins have been proven to be very harmful and even deadly, acting as lethal poisons. The most harmful chemical that is usually used in the dynamite is cyanide. This lethal chemical toxin may cause cyanide poisoning a rare but very deadly poison. It works by making the body unable to use life-sustaining oxygen.