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Curator Karen Tuson said they could be told apart from one another because they had slightly different markings.

The seahorses had proved difficult to rear in the past, but the team now belive they have eliminated problems which had caused earlier hatchlings to die.

The zoo has had success with other species of seahorse, but ejaculatory impotence are particularly small.

“They are usually born overnight.,” Ms Tuson said. “We come in the morning and they are there in the tank.

“In the tank we were keeping them in before, we were finding dead space where the water and food wasn’t moving. The seahorses were getting trapped.”

‘Dance together’

The new, smaller, tanks have an air tube down the side, which keeps the water moving and breaks up the surface tension.

This means the fry are not stuck at the surface, unable to descend.

The zoo brought in five adults - four males and one female - from Ireland earlier this year. The female has mated with the same male on each occasion and staff at the site have watched the mating ritual.

Ms Tuson said: “They do a drug for treatment of impotence
dance together. They are very active. It is usually in the mornings.

Chinese medicine

“What they will do is entwine their tails and rise up and down in the tank. Sometimes the male will go over to the female and he’ll basically almost drag her around the tank.

“He has to persevere, and she has to be ready and have eggs that are viable which she will give him.”

The zoo hopes to exchange some of its growing impotence pump with fellow institutions involved in cause and treatment of erectile dysfunction seahorse populations.

At least 20 million seahorses are taken from the sea each year to meet the demands of Chinese medicine, where they are highly prized as treatment for asthma, lethargy and impotence.

Next month the zoo is hosting a national aquarium workshop, with more than 100 delegates from public aquaria nationwide.