Friday, August 19, 2016

Goldfish turn into monsters in the wild – The Russian Times

The scientists recommend not to let the fish in the open water, and returned to the pet store or sacrificed in the freezer.

Australian researchers studied the behavior caught in the wild goldfish and concluded that they pose a threat to the ecology. We investigated fish issued by the owners in the West Australian river Vassa, but their populations are observed in many other freshwater bodies in a warm climate, according to the portal N + 1 with reference to the Ecology of Freshwater Fish journal.

Employees of the University of Murdoch and James Cook for a year watching the population of aquarium goldfish issued owners in West Australian Vasse river. To observe them using a passive acoustic telemetry installing scanners at the various sections of river hydraulics

It turned out that in the river there is a stable population of goldfish -. On average, each individual enters the field of view of 64 percent of the scanners days a year. At the same time representatives of the invasive species is very mobile: on the day they moved in an average of 300 meters of the riverbed. One of the fish registered for the year overcame a distance of over 230 kilometers, including 5.4 kilometers in one day

Also, scientists have recorded significant seasonal migration goldfish:. During the spawning season they prefer to move into water reservoirs stagnant water connected to the river channels. According to researchers, these ducts can be a convenient place for mass fish catches to control their population

In the food-rich waters of the Vasse goldfish in about 20 years living up to impressive sizes. Many of captured specimens have weighed more than a kilogram, and the largest weighed 1.9 kilograms. According to researcher Stephen Beatty (Stephen Beatty), a similar rate of growth was not observed anywhere in the world.

Beatty said that in the wild goldfish are omnivores and cause significant damage to native species, destroying the food supply, eating caviar other fish and spreading infection. In addition, they raise from the bottom mud and destroy algae.

In an interview with Mashable Australia Beatty asked the owners of aquarium fish is not to let them into the open waters. The best way to get rid of annoying pet he called putting it back in the pet shop, and if this is not possible -. Euthanasia in the freezer

Goldfish domesticated by man in the VII century BC (they were taken from the carp) and They are now among the most popular aquarium fish. Their stable population, descended from animals released owners, there are many freshwater ponds in warm climates, where they are also harmful to native species

Goldfish -. Not the only invasive species of freshwater fish in Australia. Recently, the authorities announced plans to exterminate European carp or carp, in the Murray River with the help of highly virulent herpesvirus. Biological methods to combat invasive species were used in Australia in the past: in the 1950s, the authorities have reduced the populations of rabbits, their infecting pathogen myxomatosis. However, for 70 years patogenyprisposobilis animals and each other – at first increased resistance to infection, and the latter began to cause a milder form of the disease


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