Fish need trace elements in their diet to have a healthy fully functioning immune system. This can be provided by a good quality varied diet.[1] (Aquarists often advise giving your fish 3 or 4 different types of food a month to ensure that the animal gets all its required minerals).
Whilst there is a lot of data on commercially exploited fish, there is little information on the vast range of fish sold in the ornamental fish trade. But it is reasonable to assume that the basic range of chemicals for the fish above would apply to other fish from similar eco-systems.
Protein
Amino acids - Arginine, Histidine, Isoleucine, Leucine, Lysine, Methionine, Phenylalanine + tyrosine, Threonine, Tryptophan, Valine
Fatty acids - n-3 & n-6
Microminerals - Copper, Iodine, Iron, Manganese, Zinc, Selenium, Fluorine
Fat-soluble vitamins - A, D, E, K
Water-soluble vitamins - Ribolfavin, Pantothenic acid, Niacin, Vitamin B12, Choline, Biotin, Folate, Thiamin, Vitamin B6, Myoinsitol, Vitamin C
Macrominerals - Calcium, Chlorine, Magnesium, Phosphorus, Potassium, Sodium
* These chemicals were copied from the Nutrient Requirements of Fish, National Academy of Sciences, pp. 16-21,1993.[1]
* This is why it is important to do regular water changes in a typical aquarium set-up as tap water naturally contains most of the trace chemicals and as they are used up by plants and your animals they will need replacing.
http://www.theaquariumwiki.com/Trace_elements
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