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Dangerous Fish and Mollusks Fish and mollusks may be one of your major sources of food. Therefore, it is wise to know which ones are dangerous, what the dangers of the various fish are, what precautions to take, and what to do if you are injured by one of these fish. Fish and mollusks will present a danger in one of three ways—by attacking and biting you, by injecting toxic venom into you through venomous spines or tentacles, and through eating fish or mollusks whose flesh is toxic. The danger of actually encountering one of these dangerous fish is relatively small, but it is still significant. Any one of these fish can kill you. Avoid them if at all possible. FISH THAT ATTACK MAN F-1. The shark is usually the first fish that comes to mind when considering fish that attack man. Other fish also fall in this category, such as the barracuda, the moray eel, and the piranha. SHARKS F-2. Sharks are potentially the most dangerous fish that attack people. The obvious danger of sharks is that they are capable of seriously maiming or killing you with their bite. Of the many shark species, only a relative few are dangerous. Most cases of shark attacks on humans are by the white, tiger, hammerhead, and blue sharks. There are also records of attacks by ground, gray nurse, and mako sharks. Figure F-1, shows various sharks and their sizes. 420