Just a warning to people who try to net silver sharks for any reason! I had to catch my 15 cm silver shark as I was moving house. The water level in the tank was down to about 7 cm, to give them less room to evade, but even in this depth, 'Jeeves' the silver shark shot out of the water and bounced off the CEILING (!) before landing in the fireplace, where I managed to catch him. He suffered no serious injuries, and is in the best of health now in the new house.