This is OP's question:
It didn't have to do anything with pond stocking with your own fish.
I'm just saying that it's important to make sure your private pond that is isolated from waterways before releasing any fish that isnt native to that area.
I agree 100%.
There is no need to make your extreme liability (an interconnected waterway on you property) one thousand times greater by adding any potential harmful element into it that will most likely have some negative impact to the surrounding. This would most certainly include non-native fish and I believe that we are on the same page and don't think it a wise idea to chance any introduction of non-native species to one of these types of bodies of water. With that said, it is not illegal in MD to do so in a private pond, just plain stupid to do so.
Please also understand that you are liable for any diseases that spread from the addition of native species. This is where purchasing stock from a certified hatchery benefits the pond owner again mitigating your liability with proper planning. Please keep in mind that if you were to catch a number of native fish in your area and raise them in an aquarium by themselves, you would still be liable for stocking diseased local native fish into your interconnected body of water if it were to infect any of these connected waterways!
It is also important for the TS to understand where to reach out for information in their local area (state) DNR to get the most accurate rules surrounding the management responsibilities as an owner of these types of bodies of water.
I was so blown away by the utterly insane amount of potential liability that comes with owning a natural spring fed pond that I was educated on by the DNR.
- We had to come up with a flood plain for the pond exit so that the house that was built on the property below (down hill) from my pond could not be easily flooded in the event of a major storm surge.
- I was slightly surprised at how relaxed the requirement for a fence surrounding a natural pond was in Carroll County Maryland. It is totally unlike that of an in-ground pool where code states that the fence surrounding your pool must be a minimum of 3 feet high, I believe there is a 3" maximum space in the fence grate. The fence must have two doors that automatically close and latch to avoid liability from my swimming pool.
- I had to put up "No Trespassing" signs at the required intervals to negate liability for potential "drowning" in the pond.