Most variation among aquatic species can be associated with whether the animals are: 1) coldwater vs. warmwater; 2) freshwater or marine; 3) finfish vs. crustaceans
values in nutrient requirement tables only represent minima, don’t allow for processing or storage losses
AA’s, minerals stable wrt heat, moisture, oxidation
vitamins and lipids are not stable (affected by heat, oxidation, light, moisture, etc.; store in cool area)
50% of ascorbic acid is lost in processing, half-life of 2-3 months in storage