Henk inspecting the basil
fish excreta. Soluble excreta are
mainly ammonia and is the most
available mineral until it is successively transformed into nitrite and
nitrate by nitrifying bacteria. Both
uneaten feed and solid faeces need
to be solubilized from organic material to ionic mineral forms that are
easily assimilated by plants. Minerals have different solubilisation
rates and do not accumulate equally, which influences their concentrations in the water. All involved microorg