John, I'm not 100% sure about the Israeli carp, but Catfish and Koi do NOT eat Filamentous algae and will make no noticable impact on it whatsoever. Any FA in their stomach contents is ingested purely incidentally while eating other items....If Koi and Catfish are in a container with FA as their only food source, they will starve. They do not have stomach acid strong enough to break down the algae protein barrier and extract any nutrition from the algae...in short, they are incapable of digesting it and expend more caloric energy trying to digest FA than they can ever extract.
GSH filter panktonic algae but have little or no impact on Filamentous algae.
To my knowledge, no carp eats FA intentionally, but many have been imported and thought to do so...all have failed and caused huge problems in many areas once they escape confinement.
Last edited by Rainman; 06/22/11 10:48 PM.
