Show me where I stated Mysis are bad for sw fish?I said I don't feed them to my fish because I try to use a more natural diet and it may or may not be harmfull. Which is my advice to the O.P. Good luck BWFT.Keep reading my friend.Your heart is in the right place,even if your head isn't sometimes. It comes with being young . Heres some interesting info on Mysis since Gresham isn't around to help. What is Mysis relicta? Mysis are not a true shrimp though they do closely resemble and are, in fact a primitive relative of the shrimp found in the oceans. There are 58 genuses of mysis which make up the Mysidae family. PE MYSIS is 100% Mysis relicta which is one of the two types of freshwater Mysidae. All other species of Mysis are either saltwater or estuarine species. PE MYSIS are part of the zooplankton, the small invertebrate animals found in lakes that feed on microscopic algae (phytoplankton) as well as other zooplankton. In turn these organisms form the basis of the food supply for many fish. Its strange to see that there are many sw Mysid shrimp but none are made available.You can also understand why the fw versions are used.They have a common ancestory and are probably aot alike. I am sure it is cheaper to grow them and this may be the reason they are used.Hmmmmmm.