“Ecologically, the zebra mussels cause many problems. One such problem is that they need to attach to a hard surface to survive, and these hard surfaces could be anything from many man made objects to other animals. Zebra mussels will attach to crayfish, turtle shells as well as other mussels.When a native mussel has zebra mussels attached, the native mussel loses its ability to move, feed, breath, and breed. Eventually this will lead to the death of the native mussel.”
Read the rest of this article from the Indiana DNR on zebra mussels at http://www.state.in.us/dnr/files/fw-Zebra_Mussel.pdf
“While many people enjoy seeing Canada geese, problems can occur when too many geese concentrate in one area. Typically, developers and landowners unknowingly cause the problem by creating ideal goose habitat. Geese are grazers and feed extensively on fresh, short, green grass. Add a permanent body of water (water retention pond, subdivision lake(s), golf course water hazard(s) or water gardens) adjacent to their feeding area and you have the created the perfect environment for geese to set up residence, multiply and concentrate. “
Much information, including the information above, can be found on the Indiana DNR website at http://www.in.gov/dnr/fishwild/2996.htm.
An Excerpt on goldfish from the Indy Star:
Goldfish overpopulating northwestern Indiana lake
VALPARAISO – Seemingly harmless goldfish, the kind given as prizes at county fairs, are thriving in a northwestern Indiana lake and killing off game fish such as bass, officials said. Bob Robertson, a biologist for the Fish and Wildlife Division of the Department of Natural Resources, said the agency faced a similar problem 15 years ago and conducted a controlled kill-off to rid Spectacle Lake of the unwanted goldfish. Somehow, he said, the fish were reintroduced to the lake about 15 miles southeast of Gary, probably by people who did not want to keep them as pets but did not want to flush them away, either. “It only takes two,” Robertson said.