what a beautiful pond!! great work!!! as for removal you could catch the bigger ones probably with a rod and rell and a hook baited with bread or corn , or , espacially if the fish are pellet fed, the berkley trout bait you can get at just about any tackle store or walmart. as for the smaller ones an appropriate size minnow trap should work, or you could try a seine net especially as you clearly have no problem getting in the pond with the fish lol. good luck and once again great job with construction.