are any of those listed sharks freshwater? I had 2 columbian sharks that are freshwater when young and can either stay freshwater, or to grow BIG and have a longer life, slowly turn to marine. I went out of town often so i had a "fish sitter" who accidently killed them... :/ anyway... I have a freshwater aquarium and will be building a 300g soon and i wanted to know if i need to go salt water to get another shark.
There are no freshwater sharks. Unless you count freshwater stingrays.
I put up a video of them on another thread about a month and a half ago. you should be able to find it if you look under my posts on my profile.