Some of the most obvious introduced species are birds. Through the urban areas of Geelong, the Common Myna is regularly seen as are Common Blackbirds, Rock Doves (aka feral pigeons), Spotted Doves, Common Starlings and House Sparrows. All were introduced to Australia in the mid to late 19th century from Asia or Europe and have made themselves very much at home.
Blackbirds, starlings, sparrows and mynas have all become pests, affecting crops and urban gardens across the eastern part of the country whilst nesting pigeons can create unsightly messes on and around buildings.
|Rock Dove aka Feral Pigeon|
|Rabbit on the banks of the Barwon|
|Carp at Breakwater|
Other pests which are not so easy to see can be found in waterways throughout the country. Carp are common in the Barwon and are often caught by fishermen as are redfin. Both are introduced species which compete with native fish for resources. Carp are omnivorous, eating plants, insects, zooplankton and other small organisms. Significant reduction in the levels of zooplankton can leave rivers susceptible to algal blooms. Redfin eat other smaller fish and the young of larger fish, reducing the numbers of native fish and putting strain on their food supplies.
|Mosquitofish in the Moorabool River at Fyansford|
Mosquitofish are aggressive, attacking other fish causing injury and infection, they breed prolifically, are resistant to many of the toxins and chemical pollutants found in waterways and can survive in a wide range of temperatures and salinity levels enabling them to out-compete almost any other species of fish.