It could be a Fish grower, Fish farmer, his hobby work area is called the "Fisheries"
a fisherman whatelse could it be?? An Aquarist is a person who has aquariums and collects fish as a hobby, a simpler term could be fishkeeper.
Seaweed, rice, kelp, fish, plants, & algea (just to name a few)
A fish keeper is someone who either owns a lot of fish or sells fish as a hobby :)
The fin grows in
by eating grow food example fish,meat,milk,yogurt,cheese and other milk products.
If the fish is a baby and it grows then the scales expand and grow to match the fish's body.
Scales
Fish
Well after a male fertilizes the eggs they just wait and inside the egg smaller fish grows until they break free.
There is no way to sex the Black Ghost Knife Fish (Apteronotus albifrons) by just looking. There is one person who is reported to have bred this fish in Australia and he is the only person known to have bred this fish in captivity. If you manage to spawn a pair, the one that lays the eggs will be the female. This fish grows large, around 50cm. So I hope you have a tank to suit.
No, a fish's scales do not shed as the fish grows larger. Instead, the fish's scales grow in size as the fish grows. The scales provide protection for the fish and do not need to be shed like skin or fur.
as a baby no, but once it grows it will be