Since it seems you failed to read the other two threads... I quoted both original posters here...
ewurm;239016; said:Introducing an aquarium fish to the wild, wether native or non-native is a cardinal sin for a fishkeeper. Even wild caught native fish can pick up non-native disease in your tank that you could be unleashing upon the native ecological system. A non-native introduction is even worse. Non-native species compete with native fish for food and habitat, eat native fish eggs, and even destroy habitat all together. Non-native species that have caused significant problems include many species of carp, zebra mussels, the round goby, the spiny water flea, and species of snakeheads just to name a few. The introduction of snakeheads to native waters has caused the ban of ALL species of Channa to be banned from the United States. These beautiful monsters are no longer allowed to be kept in aquariums. There is also a sustained population of goldfish in the mississippi river and although they don't cause much of a problem, they give DNR officials ammo in trying to ban more species of fish that you and I keep. NEVER RELEASE YOUR FISH OR INVERTEBRATES INTO THE WILD. I hate to say it but euthanizing your fish is actually a better option than letting them go. I choose neither. If there is a fish I absolutely cannot keep anymore, I sell it or give it to another fish keeper that will provide a good home. I hope you will do the same.
It has come to my attention that there are too many people who are not aware of the dangers of releasing pets into the wild. Sometimes a fish will outgrow an aquarium, so the owner, while looking out for the well being of their pet, makes a careless, often costly mistake. Common aquarium pets have done damage to eco systems in many places. The Florida Everglades are a perfect example. At one time, the largemouth bass was the predominate species in the Everglades. In the late 1950s, oscars began to appear in Miami canals. Today, they are the predominate species in the Florida Everglades. Largemouth bass have moved down the food chain, forced to make room for this aggressive species from South America. According to this site (http://www.vtfishandwildlife.com/Detail.CFM?Agency__ID=896), the oscars are competing for food better than largemouth bass, as well as eating a large percentage of their fry. Because of this, largemouth bass in the Everglades are no longer as plentiful, or as big as they once were.
Here is what Vermont biologist Shawn Good has to say, ""It seems that the general public is largely unaware of the dangers posed by releasing aquarium fish into Vermont's waters, I can't stress enough how serious this is. Some aquarium fish, plants and other aquatic animals such as exotic snails can devastate Vermont's natural habitats and severely impact our native aquatic ecosystems if they are released into the wild. They may also introduce dangerous disease organisms that can severely impact native fish and wildlife populations."
Here is a list of reasons to not release pets into the wild from this site (http://nas.er.usgs.gov/taxgroup/fish/docs/dont_rel.asp)
Released fish will be physiologically stressed upon introduction to a different environment.
They will be susceptible to parasites and diseases.
They might be attacked by native predators, such as larger fish, fish-eating birds, or water snakes.
If exotic fish survive and reproduce, they are difficult, if not impossible to control or eradicate.
They may cause changes in the existing aquatic community through competition with native species or predation on them, as well as through overcrowding or aggressive behavior.
They may infect native fish with exotic parasites or diseases.
An exotic may also affect the genetics of native species by hybridizing with them.
Sole species may pose a physical or public health threat, such as piranhas and freshwater stingrays.
There are at least 185 different species of exotic fish that have been found in United States waters. 75 of these have established a breeding population. Florida, Texas, and the Southwest U.S. have the biggest problem due to warmer climate, which tropical species survive in. "Examples include a number of cichlid, such as the oscar, Jack Dempsey, jewelfish, convict cichlid, Midas cichlid, and spotted tilapia; and livebearers, such as swordtails, platies and mollies, and armored catfishes. The goldfish, a native of China, is one of the few examples of a temperate aquarium species that is established throughout the U.S."
link (http://nas.er.usgs.gov/taxgroup/fish/docs/dont_rel.asp)
The United States alone spends $120 billion each year managing introduced species.link (http://massbay.mit.edu/seafood/ ) Penalties for releasing pets into the wild include fines, and in some states, imprisonment. So save yourself and your tax dollars, and please either keep your pets, or give them to a person, store, or organization who will take care of them.
Above links and other notable sites:
http://www.vtfishandwildlife.com/Detail.CFM?Agency__ID=896
http://nas.er.usgs.gov/taxgroup/fish/docs/dont_rel.asp
http://news.nationalgeographic.com/news/2004/05/0520_040520_aquariumescapees.html
http://www.sf.adfg.state.ak.us/statewide/ans/scornamental.cfm
http://massbay.mit.edu/seafood/