English to Czech Other Agriculture Animal feeding

"Fish Solubles" is residue from canning plants, consisting of fish scales, skin, small bones, other non-usable parts of the fish, non-cannable fish, along with sand or other materials the fish might have had in his stomach at the time of the catch. "Fish Solubles" is shipped as liquid sludge and then stored in closed tanks at the point of use for several years to allow fermentation to take place. The fermentation process increases the nutritive value of the solubles so they are more effective when added to animal feed. As they ferment they become increasingly acidic, making them more difficult to handle corrosion-wise as they age.