What is an example of parasitism in oceans?

Answer 1

Many parasites exist in the ocean. Often the large mammals, like whales, can have intestinal worms living in them. Other parasites include isopods, which are ectoparasites (they live on the outside of their host).

Parasitism happens when one living thing lives off of another living thing, causing that other living thing harm. Parasitism is not when one organism kills another and then eats it. That is just an example of predator/prey. Sometimes organisms die because of parasites, but something is only a parasite if it gets its food from something that is still alive.

Whales eating crill isn't really parasitism, it's an example of predator/prey. Parasitism is kind of different from predation. I just wanted to clear that up.

Some fish eat other fish's scales, more specific information at http://en.wikipedia.org/wiki/Lepidophagy

Answer 2

A male fish becoming part of a female fish and sucking her blood for the rest of her life