The Youth Tudan Breed Fish Station has increased feed production, built an earthworm habitat to supply enough feed and put their efforts into ensuring conditions of growth, including water quality and pH.

The Hamhung Catfish Farm has put catfish production on a more scientific basis and has built over 1 200 square meters of outdoor fishponds to increase the fish production in every season.

The Sohung Poman Fish Farm has established a technique of artificial spawning of fish and introduced a method of rearing snakeheads with assorted feed.

The Yomju Youth Fish Farm, which raised the survival rate of fish, has stocked rivers and streams with more than 2.1 million fry this year.

The Chongjin City Breed Fish Station has taken measures for supplying feed including building a 100-odd square meters of microbial culture ground while raising the fertility and survival rate of fish.