SYDNEY, Aug 16. (Xinhua) -- Researchers in Western Australia have found that unwanted pet goldfish dumped into rivers are growing as large as 1.9 kilograms and are damaging the habitat of other native fishes found in the waterways.
Dr Stephen Beatty from the school of Veterinary and Life Sciences at Perth's Murdoch University told Australian Broadcasting Corporation (ABC) on Tuesday that goldfish released into the waterways have ballooned to over 1 kilograms, with the largest weighing at 1.9 kilograms.
"Perhaps they were kids' pets where the family have been moving house and their parents, not wanting to take the aquarium, have dumped them in the local wetlands," said Beatty.
"Unfortunately, a lot of people don't understand that wetlands connect up to river systems and introduced fish, once they get in there, can do a lot of damage to native freshwater fish and the aquatic habitat."
Beatty said goldfish like carp can cause a host of problems once they become established in a freshwater system including bringing unknown diseases to the native populations.
"We know that one disease has been introduced and we think it has probably come in on goldfish," Beatty said.
"It causes lesions on the skin, it's pretty horrible to look at."
Beatty's most recent research which involved attaching acoustic transmitters, similar to those used to track sharks in the ocean, spotted 15 monster-sized goldfish in the Vasse River in Western Australia' South West in the last 12 months.
"What we found is that they actually migrate off the main channel into the Vasse River into a wetland system to spawn," he said.
Beatty said the ideal strategy was to prevent goldfish from entering the rivers in the first place.
He advised people who had unwanted fish in tanks at home to either return them to a pet shop or kill the fish by freezing it.
LONDON nike air max 2019 italia , July 10 (Xinhua) -- Six times Olympic champion Usain Bolt will run at the IAAF Diamond League in London on Friday 24th July, organizers said on Friday.
Also participating will be double Olympic gold medalist Mo Farah and women's heptathlon gold winner Jessica Ennis-Hill, world record holder and London Olympic 800m champion David Rudisha and more than a dozen world or Olympic champions.
The two-day Diamond League meeting is part of London's Anniversary Games from Friday 24th to Sunday 25th July.
The Mayor of London Boris Johnson said: "The opening night of the Anniversary Games has attracted the strongest field ever assembled for a single night of athletics nike air vapormax plus italia , providing Londoners with another 'I was there' moment. The chance to see a living legend like Bolt is very rare and we are delighted to be able to welcome him to the reopening of the stadium where he so thrilled us all at the 2012 Games.'
"It is a beginning of a new chapter for the Stadium and there will be many more amazing nights to come - it is wonderful that we are starting in such style."
Bolt - considered to be one of the greatest sportsmen of all time last competed individually in Britain at the Anniversary Games in 2013 where he won the 100m in 9.85 seconds.
The 100m and 200m world record holder, winner of six Olympic and eight world titles is looking forward to returning to the scene of his spectacular Olympic triumphs.
Bolt said: "London is a special place where I love to compete and I am looking forward to the Anniversary Games on July 24.
"I have great memories of competing in the Olympic Stadium in the summer of 2012 and in the previous Grand Prix meets in London."
The event takes place just four weeks before the IAAF World Athletics Championships in Beijing and will be the final time the original London 2012 track is used, before a new surface is laid for the London 2017 World Championships.
British Athletics have secured the right to host athletics in the former Olympic Stadium for one month every year for the next 50 years from 2016.
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