Vitamins are just as important in a fish's diet as in that of a human being. They play a role in the formation of the skeleton, enhance growth, and strengthen resistance to disease, A fish which suffers from vitamin deficiency becomes weak, although this is not visible at first.
Vitamins do not keep well as they deteriorate under the influence of heat, oxygen, and light. This is why aquarium fishes' vitamin supply mainly comes in the form of fresh food, live prey, or frozen products.
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