Whats the major difference between a feed for freshwater fish and that for marine fish?
Freshwater and marine fish have very similar nutritional requirements with the exception of fats and minerals. The fat situation is quite complex and varies from species to species, so most fish diets cover the bases by providing an array of fats. Vitamins are a different story, at least they are in Aquadine feeds. We know that freshwater fish live in an environment that contains very low concentrations of minerals (things like magnesium, calcium, zinc and others that are required for proper nutrition). Thus, the Aquadine freshwater feeds contain supplementary minerals. Marine fishes, on the other hand, live in water that is loaded with minerals. To top it off, marine fish drink large amounts of water that contains those minerals. They get rid of the excess minerals by producing very small amounts of highly concentrated urine. So, they don’t need to have additional minerals in their feed, and Aquadine’s marine formulation is not supplemented with minerals for that reason.