Round Goby - Invasive Species

 

 

 

 

 

 

 

 

It never fails, I will catch at least on of these every time I go fishing.  Here are some facts, basically these things are seagull fodder.  Throw them to the birds when you catch them better yet in a garbage receptical, DO NOT TOSS THEM BACK.

 

The round goby is a small, bottom-dwelling invasive fish. Native to the Black and Caspian seas in eastern Europe, it was first found in North America in 1990 in the St. Clair River north of Windsor, Ontario. Researchers believe the fish was brought to North America in the ballast water of ships from Europe. In less than a decade the round goby has successfully spread through all five Great Lakes and has begun to invade inland waters. In some areas the fish has reached densities of more than 100 fish per square metre.

Round goby prefer waters with rocky and sandy bottoms. They feed aggressively on insects and other small organisms found on lake and river bottoms. Adult round goby eat large quantities of zebra and quagga mussels, and occasionally small fish and fish eggs. Their aggressive eating habits and ability to spawn several times each season have helped them multiply and spread quickly.

 

Range

 

Outside its native range, the round goby has been found in all five Great Lakes and many of their tributaries, including the Illinois River. Round goby are also found in some inland waters in southern Ontario such as Lake Simcoe, the Trent River, Rice Lake, and parts of the Otonabee River.

 

Impacts of Round Goby

 

The round goby's aggressive habits and rapid spread have had serious impacts on native species.

• The fish compete with and prey on native bottom-dwelling fish such as mottled sculpin (Cottus bairdii) and logperch (Percina caprodes). Round goby also threaten several species at risk in the Great Lakes Basin, including the northern madtom (Noturus stigmosus), the eastern sand darter (Ammocrypta pellucida), and several species of freshwater mussels.
• Round goby have reduced populations of sport fish by eating their eggs and young and competing for food sources.
• Researchers believe the round goby is linked to outbreaks of botulism type E in Great Lakes fish and fish-eating birds. The disease is caused by a toxin that may be passed from zebra mussels, to goby, to birds, resulting in large die-offs of fish and birds.

To prevent the spread of this invasive species, the Ontario government has banned the possession of live round goby and the use of round goby as a baitfish.