Once it lights on the body of a fish, its legs are marvelously designed to become grappling hooks and it attaches itself firmly to the body of its victim, which could be any one of a number of fish, such as a carp or a sticklefish. Once it has itself attached, the host fish seems helpless to shake it off. The next piece of ingenious equipment the Argulus brings into play is a long sharp hypodermic needle. This it slides under the scale of the victim fish and into the body tissue. From thereon out the Argulus has a direct pipeline to the life juices of the victim, and can feed at will, with very little effort on its part.
Parasites can kill.
In such a case the fish becomes sluggish, and as it weakens, it dies. The Argulus have then lost their succulent host as a source, and must abandon it and make the effort to find another. The trichina is a small spiral worm, too small to be seen by the naked eye. The trichina also lives in animals, especially pigs and eating the meat of infected pigs is the main cause of human trichinosis, a disease widely distributed in various backward parts of the world. Raw pork biggest source.