London Zoo is appealing to fish keepers to try to find a mate for a critically endangered, tropical species.
The Mangarahara cichlid is extinct in the wild but the three in captivity are all male.
Described as "gorgeously ugly", the Zoo is hoping to start a conservation programme if a fit female can be found for the captive males.
And with two of the males now 12 years old, the quest is said to be extremely urgent.
Continue reading the main story?Start Quote
End Quote Brian Zimmerman London ZooI think there's probably a very slim to no chance of this fish surviving?
These cichlids were named after the Mangarahara river in Madagascar where they were first found.
The construction of dams on the river caused the streams they lived in to dry up and the fish is now believed to be extinct in its natural habitat.
Bachelor boysThere are two males in captivity at London Zoo and another in Berlin. There had been a female in captivity at the German zoo but attempts to breed ended in disaster when the male killed her.
"It's a fairly common thing with cichlids," London Zoo's aquarium curator Brian Zimmerman told BBC News.
"They are unusual fish compared to many in that they practise pair bonding and parental care of the eggs and the fry, so there's a lot of tussling that goes on between them."
Having carried out a search with other aquariums around the world and failed to find a mate for their bachelor boys, the team at the Zoological Society of London are now hoping that someone may have a female in a private collection.
According to Mr Zimmerman, if you have one you're likely to know it.
"They are not a particularly beautiful fish - they are gorgeously ugly, they are unusual. They are more a connoisseur's type of fish. They need quite a bit of space; the males are bigger than your hand, and they need a decent tank," he added.
Given the age profile of the London males and the failure to find a mate in the world's zoos, Mr Zimmerman is not very confident for the future of the species.
"I'm not very hopeful. This freshwater fish crisis is huge worldwide, and as water becomes diverted for human use it becomes scarcer and fish generally lose out," he said.
"I think there's probably a very slim to no chance of this fish surviving."
London Zoo is asking anyone with information about female cichlids to email the team at fishappeal@zsl.org
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Source: http://www.bbc.co.uk/news/science-environment-22468206#sa-ns_mchannel=rss&ns_source=PublicRSS20-sa
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