Why sharks don't eat other fish in aquariums
One of the challenges faced by staff in aquariums is making sure all the fish can live together peacefully.
They may need to put animals like sharks in the same tanks as smaller fish - but they need to be sure the sharks won't eat their smaller tank-mates!
To do this, staff at the Blue Reef Aquarium in the north-east of England are teaching their sharks a special feeding technique called target feeding.
It means the shark will know what it is allowed to eat and what mustn't be dinner!