Results
Sink rate of pelleted diets
The sink rate of diets M3 and M4 was faster than for all other diets, with more than 90% of the pellets sinking within 2 min (Fig. 1). The most buoyant pellets were the Ctl and P2 diets, with less than
20% of these pellets sinking after 60 min contact with the water. The P1, M1 and M2 pellets were of intermediate sink rate, taking about 20, 40 and
50 min, respectively, for half of the pellets to sink.