My husband puts his GoPro camera in our pond and it is great... The fish like to check it out.

I was going to suggest a GoPro too - don't have one yet, but it's on my list of "someday"!

I've had underwater cameras for years, mainly viewing on my inside tv, but recently started stream via a dedicated web server

http://50.45.147.41:4455/

The view on a television is remarkable. I use the non-Infrared Lorex 6991 model, which has unfortunately been discontinued.

The gopro will work great for Hi Def recordings, but IMO is not a suitable permanent solution due to battery power and lack of wifi transmitting under water.