well i only had my licence as the area im in as i have a min cannal by me and s 6 mile long lake by me where huge sturegon were founf dead the one was 9ft long all ove the loacal newspaper were it had died from old age or something likt that , but i can get common or albino wels catfish and there only around the 2"-4" marke your koi will get eaten if you out a large one in the pond but there some thing eles on the licence but im not sure (u could have one on the sly
) lol but just find out they will get around 4ft-6ft in cold water mabey bigger if feed every day and large emounts .