The Mirae-dong Weekly Nursery on Mirae Scientists Street in Phyongchon District, Pyongyang, built a fish farm on its rooftop.
A little over 1 000 square metres in area, the roof as a whole is decorated with green colour, thanks to the perimeter and field-like greening of it. Notable in particular are artificial ponds where many fishes are cultivated.
The artificial ponds are teeming with catfish, Ryongjong fish, carp and other fishes.
“In the course of greening the roof of the building three years ago, we came to think how to make effective use of radiation heat from the roof. So, we discussed it repeatedly and finally built the fish farm,” says Kim Hye Suk, head of the nursery.
According to her, the fish farm breeds fish from May to September, early October at maximum, and they ensure enough temperature for the growth of fish without having to supply hot water.
The waste water from the wading pool of the nursery is filtered and raised with a pump to be used for the operation of the fish farm.
And the water from the fish farm is sent to the greenhouse and vegetable plots on the rooftop to be used as quality fertilizer.
The nursery produces fries by undertaking artificial spawning and incubation by itself to increase the rate of their survival and their weight.
And it uses Hermetia illucens as protein feed by raising the insects a lot using the excrement of domestic animals from its livestock farming base and different kinds of by-products from the operation of the nursery as the source of their feed.
Besides, it also decreases the proportion of grain feed by using natural feed, assorted feed and feed additives.
The nursery built an underground fish farm where they can raise cold- and hot-water fishes so as to do fish farming uninterruptedly even in winter.
As a result, it breeds fish all the year round.
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