The company boats all put young lads to the local "trawler school" where they were taught about the gear , how to splice rope , mend the nets , etc. The skipper owned boats were different all the young lads grew up around the boats and normally would have been taught about mending nets , etc by their Grandfather and on summer holiday trips from school.
I had a needle in my hand being taught how to mend nets by the age of 4 , been taught how to splice ropes and wires by the time I was 7 and had been going to sea on my families boat by 7 as well for my summer holidays. By the time I was 12 the only thing I hadn't done was work the winch during fishing ( worked it a lot in harbour changing wires , etc though , it would have been too dangerous to let someone as young as 12 work the winch ) but I had been up in the wheelhouse with my Uncle and Father being taught how to handle the boat and take a watch.
There is a fishermans training course run in various colleges around the country now Bryan , my local college ( Banff and Buchan Technical College ) runs a training course , there's one up in the Shetlands at Scalloway College and at least one or two in England as far as I know.
There is an awful lot more to learn now compared to when I was a kid. The nets are huge compared to 40 years ago , the boats all work over the stern using powerful winches and net drums , the fish goes into a reception hopper and there sometimes is a hydraulic driven belt that takes the fish out of the hopper so the crew can sort the catch. There is a lot to learn about hydraulics now compared to 40 years ago.
The wheelhouse electronics are like the starship enterprise compared to even 25 years ago as well. When I started we had 1 Radar , a paper sounder , a lupe sounder ( looked like an oscilloscope where you could see the fish beneath the boat ) , 1 mk21 Decca Plotter with the electrically driver paper chart plotter , 2 Sailor RT144 VHF's and a single Sailor SSB set , 1 magnetic compass and an air fog horn. Nowadays there are 2 Radars ( 1 of which has to be an ARPA type ) , 4 or 5 VHF's , an SSB set , 2 colour flat screen GPS Navigation plotters , 2 colour flat screen fish finder sounders , some boats have a type of plotter/sounder that works in 3D ( OLEX ) so you can see pretty accurately where your net is on the sea floor , mobile phone , sat phone , internet ( off the sat phone ) , SKY tv , CCTV cameras , the controls for the winches , bow thruster , the displays for the net sensors. It really is hugely different now compared to 25 years ago let alone what they had 60 years ago