How do hammerheads change from babys to adults?

Does cod fish have scale? What are accepted method of disposing of koi pond water? Do fish swim with the current or against? Can a mayfly surive in dirty water? Do sharks have mustaches? How do you set up a sand filter? How long can mermaids breath for? How is the operculum of a bony fish more efficient than the gill slits of a cartilaginous fish? How long can triggerfish can get? What is shark liver used for by humans? Is anyone looking for megladon? If water weighs 62.4 lbs and a fish tank measure 12 inch x 12 inch x 12 inch and is full of water what is the weight of the water? What to porbeagle sharks eat? What does gray white shark eat? What predators does the snipe eel have? How did the kwakiutl save salmon in the winter? What are all the items you need for a fish tank? Can you use an airstone in a ten gallon tank? Is salmon high in cholesteral? What fish do seahorses eat?