Sharks do not have a swim bladder like fish, they use bile to control their depth. Evidentially sharks don't have bones or overlapping scales either. The sharks in my tank are not really sharks they are just fish that look kind of like sharks.
OK now back to fish. Fish live in fresh water, salt water, and brackish water. Fresh water is water that does not have salt in it, it is found in rivers, lakes, and ponds and so are fish. Salt water is water with lots of salt in it and is found in the Oceans, and two lakes the Dead Sea and the Great Salt Lake. Fish live in the oceans but not in salty lakes. Brackish water is water that is salty but not as salty as the oceans, brackish water is found in estuaries where rivers meet the ocean. Different types of fish live in fresh water, brackish water, and salt water.
For the most part fresh water fish can't live in salt water and salt water fish can't live in fresh water. Though there are exceptions like Salmon that live in the ocean except for when the are going to reproduce when they swim up the rivers to lay their eggs. Another exception is the Sea Cat, also called the Silver Tipped Sharks, and some other names I cannot remember. The Sea Cat is born in fresh water river and as they grow the move closer to the ocean. So one way to look at it is that the bigger they get the saltier they like the water.
6 comments:
I thought sharks were fish. You seem to imply that they are not. Please clarify this important matter.
A shark is a cartilaginous fish, which differs from fish typically kept in personal aquariums, though some people will keep small sharks in large salt water aquariums.
So you concede that sharks are in fact fish? You seem to have shifted your position on sharks in response to the public outcry at you excluding sharks from your definition of fish. I was outraged that you would deem sharks "not fishlike enough" to be included as fish. However, I think your clarification doesn't go far enough in granting sharks their long overdue status as full fledged members of the fish family. I demand that all benefits given to traditional "fish" be granted to all sharks as well, regardless of dorsal fin size.
Sharks are fish, but as I mentioned the differ from the common fish (bony fish) that are kept in aquariums, therefore I cannot include them in the fish I am referring to as the have a skeleton made out of cartilage, and don't have a swim bladder.
Perhaps I should put that I am referring to bony fish in my post, thank you for helping make this information more accurate.
I see your shark exclusion as a thinly veiled attack on traditional shark values. Your elitist anti-shark attitude is typical of today's "bony fish" favoring bloggers. Instead of trying to establish dialog with our "bone deficient" friends, your blog seems focused on relegating them to the sidelines while less deserving "bony" fish bask in the spotlight. I demand equal time for sharks, it's only fair.
I will see what I can do about giving sharks more blog time. But seeing as this was originally intended as a fish keeping blog, and sharks get too big for my ability to keep, I wasn't going to mention them much. But we will see what happens.
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