Bow thruster power

You can fuse them individually or jointly. Doesn't really matter. Obviously the individual fuses would need to be 50%x the nominal fuse required, and the new cable that you're running needs to have identical conductivity to the existing cable, not merely similarish. If any doubt on that, fit a joint fuse

No way. Parallel the cables into a single fuse, definitely do not fuse them individually. If one fuse blows, you're then moving all that current through one cable and you probably won't know about it until you get a strong visual indicator (the boat being on fire)
 
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