Why is a pond a good home for a leech?

What country is famous for its fish catch? Do swordfish live in fresh or saltwater? What should you do if your betta isn't flareing at it's reflection? What color eyes does a coy fish have? Are round goby consumers? How To Tie On Fish Hooks? Fish that starts with d? Every time I add a new fish to my aquarium it dies but the fish I've had in there from the beginning are perfectly fine. Why is this? Why are sharks scared of dolphins? How do sharks find shelters? Why are the cans used for canned salmon tapered? Phosphates and nitrates entering a lake can cause an explosive growth of algae called? Where are Moray Eels found? How many stomachs does a fish have? Where was the biggest large mouth bass caught? How fast does the seat altea go? What year were angler fish discovered? Why are dogfish sharks a good choice for dissection? How many pounds does a viperfish weigh? How long has the corydora catfish existed and How long can they live in the wild and in captivity?