A mobile cage-net fish farm built on the Taedong River in Pyongyang.
The Taedonggang District Cage-Net Fish Farm in Pyongyang has been increasing fish output of late by improving the methods of fish farming.
“We are increasing productivity by effectively calculating the depth of relevant water areas, the vertical distribution of plankton and the characteristics of the area with good sunshine conditions,” said Kim Hyon Chol, manager of the fish farm.
The farm pays special attention to increasing the proportion of natural feed.
To this end, it constantly moves its cage-nets to the place with favourable feed conditions and produces floating feed from fish meal, domestic animal bones and other by-products. It has newly built a breeding ground for earthworm and water fleas to get protein-rich feed.
The increase in the proportion of natural feed has facilitated the supply of feed and doubled the fattening rate of fishes.
According to employee Choe Tong Chol, the farm secures natural feed for more than 15 days ahead and uses a quick-freezer to prevent them from decaying.
The farm also applies different fish farming methods that suit seasonal conditions.
In order to reduce the damage by muddy water in the rainy season, it uses a water quality measuring device to lay nets at a depth of 1-1.5 metres, unlike at normal times. It also sterilizes fishes with weak salt water when the river water gets clear in order to prevent the outbreak of diseases.
It increases the fattening rate of fishes by grading them by sizes.
Even the fries spawned in the same period differ in the speed of growth and consequently in their size with the passage of time, which makes it impossible to increase their weight increment rate at the same time. To prevent this, the fish farm timely classifies them by size to grow them in suitable cage-nets.
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