The nature of science is that experiments are repeated many times with slight variations before we consider that something is known. This paper does add detail

The nature of science is that experiments are repeated many times with slight variations before we consider that something is known. This paper does add details I hadn't seen before - it shows that adding algae to the diet increases the efficiency of converting feed to body mass, and reduces feed intake. There was reason to believe that would happen, but I'm not sure it had been demonstrated experimentally.