Lake Tahoe is currently in a battle with over-sized goldfish that began when aquarium owners tossed their unwanted goldfish into the lake. Over time they have not only reproduced, but have grown extremely large. One specimen caught in 2011 was over a foot long and weighed nearly three and a half pounds. Needless to say, such a large non-indigenous fish can do some serious damage to the ecosystem.
To anyone who is thinking about tossing unwanted fish in a local waterway - don't. Give that fish to a friend or ask a local pet shop if they will take it. The same is true of your aquarium plants. Don't dispose of them in a local lake or river. If you can't give your plants away, destroy them. Here are more ideas and information about unwanted aquarium fish and plants.
Genetically Engineered Fish
Glow In The Dark Fish
Snakeheads Call Potomac Home
Photo © Dennis Platten