DESCRIZIONE
A method for the prevention or amelioration of plant-induced enteritis in fish is provided which comprises feeding to said fish a biomass derived from a culture of methanotrophic bacteria. Also provided is a combination of a biomass derived from a culture of methanotrophic bacteria and an enteritis-causing plant material which can be used, for example, as a replacement for fishmeal in fish feeds or fish feed components. In particular embodiments, the enteritis-causing plant material is soybean meal.