David

=Activity 2= When was the species introduced to Australia? ** Carp were released into the Australian wild on a number of occasions during the 1800’s and the 1900’s. They didn’t become wide spread until a released of the ‘Boorla’ strain of carp was introduced to the Murray River near Mildura in 1964. The spread of carp was then excelled by major flooding in the early 1970’s.

They were introduced to Australia because they a fish that will bread quickly and are fished in large numbers so they would be a stable supply of fish.
 * Why was it introduced? **

There are two major reasons that the Carp has been able to survive so well in Australia. First is their broad environmental tolerance and thrive in habitats that have been disturbed and inhabited by humans; such as places were water flow have been changed, nutrients are enriched and vegetation is cleared on the bank. Secondly is the numbers in which they reproduce are huge. A single female carp may lay up to 1.5 million eggs a year, varying on the size of the fish. They can live up to 15-20 years and can get up to 60 kg. They start breading at the age of 2-4 years.
 * Why has it survived so well in Australia? **
 * Where is it found? Indicate on a map of Australia. **

This is just some major places that are populated by carp. They are pretty much everywhere though.

Carp are fish that like to splash round in doing that, degradation of water quality is severely affected. It is still unclear what impacts the carp has on native fish populations. Carp carry a number of diseased organisms including the Asian fish tapeworm which now occur in Australia, and may pose a serious risk to Australian native fish.
 * What diseases are associated with the species? **


 * Activity 3**

1. Cattle have been denied access to high altitude grazing because of there impact on the natural environment. They cause great amounts of erosion to the mountain, stream banks and pollution of waterways.

2. Parks victoria and the Department of Sustainability and Environment are in charge of issuing farmers the cattle grazing licences.

3. About a dozen of the national parks are likely to recommence grazing in the summer.

4. Areas that are located above 800m have a slower recovery rate due to the snow and frost that take place over a set amount of time.

5. Ian Harris reckons that cattle are let free to roam the mountain side, causing damage to stream banks and polluting water quality.