DESCRIZIONE
The invention provides a material derived from algae (e.g. of the genus Chlorella) for the prevention or amelioration of plant-induced enteritis in fish. The algae- derived material is preferably intact or ruptured cells of and/or a cell fraction of the said algae. Also provided are fish feeds comprising said algae-derived material for the prevention or amelioration of plant-induced enteritis in fish, as well as such feeds in combination with an enteritis-causing plant material, which may comprise a reduced fishmeal content and/or enhanced plant ingredient content relative to conventional fish feeds.