The reel. I heard this a long time ago. I fish a lot now but only fresh water so I can only guess what the deal was. Could be just to reel them in fast since they pass so quick. Could also be used to raise a net quickly. But they were rod with I think chain saw engines.

Now that I'm thinking about it, electric motorized reels are popular today for deep sea fishing. Maybe these were actually the 70s prototype to haul fish up 300m and catching flying fish is another story I'm mixing it up with.

Edit: I'm so sure I remember the cover of a fishing magazine that had like 3 people on the bank with these chainsaw rods to catch flying fish.