[Artificial change of nutrient cobalt chains in fish-hatchery ponds].
D000821:Animal Feed; D000818:Animals; D003035:Cobalt; D005399:Fishes; D014805:Vitamin B 12
D003035:Cobalt; D014805:Vitamin B 12
Iskusstvennoe izmenenie kobal'tovykh pishchevykh tsepeĭ v rybovodnykh prudakh.