My pond was contaminated by bulheads and what I can absolutley rule out is human transplant and bad weather. We have had none of either one. There is only the pesky heron. I have consulted local experts at the state level and they assure me it is the herons. Bird transplant is usualy just an egg or two. I only caught 2 adults last year. I am sure human transplant is common in public waters but not here. Most public waters have a large enough diversity of fish to handle a few stray trash minnows. Unfortunately all my Bass died the winter before and I had to remove 360 young bullheads by hook and line and only caught 2 adults.
