(15)N-labelling of fishes by means of (15)N-isotope in the water of aquarium and the influence of a different protein nutrition on the (15)N-elimination after the labelling period

appareil digestif azote branchie branquias carp carpa carpe digestive system farine de poisson fish meal foie gills gluten harina de pescado liver muscle muscles nitrogen nitrogen metabolism radioisotopes radioisotopos sistema digestivo soybean meal tortas de soja tourteau de soja trigo wheats