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However, I've wondered why some states require sterile grass carp while an adjacent state may not. Certainly grass carp escape pond confinement and are released into water systems contiguous to several states.
The rational for dropping the triploid requirement on GC's in NE was that they had already escaped and were breeding in the river systems here, there was no point in contiuing the restriction once they were established up in the river systems.

How about diversity other than just fish? We have lots of bull frogs, a few leapord frogs and we even see an occasional tree frog. We have lots of painted turtles and even a few snappers as well. A few weeks ago while fishing I was treated to a close encounter with a mink along the face of our dam. One of the things my folks like to do is bird watch and the pond attracts a great diversity of birds to it, the spring duck migration is one of their favorite things regarding our pond.