You have to take your hat off to the Chinese. They cross bleed Koi with some Amazon fish
and produce this feeding bottle sucking fish. They start training them to take bottle feedings at 1 year old.
By 2 they are on exhibition in places like parks etc. Each feeding bottle is sold for RMB 10.
Most parents and young couples are happy to pay to feed the fish.
It is claimed that they suckle like babies and are very cute.