Your job is simple: 1. Collect all Amalgams 2. Don't die.
Luckily for you Amalgams, mutated creatures of unknown origin, already come captured in their own little boxes known as F-POT's (Floating Pots).
You only have to worry about collecting them, use your crane and get it all inside the ship's hold. Don't worry if this sounds a little abstract, everything is explained in your instructions manual.
Navegate!
You've got a whole fishing ship for yourself! Be careful not to crash it.
Collect!
F-POT's are floating jails that float to the surface once activated.
Capture!
You shouldn't really find any surprises, Amalgams are usually found in catatonic state or plain dead due to the Amalgamation process that origines them, so relax, you'll be fine.