I worked on a Japanese pole and line fishing vessel in fiji for two years and this scene is quite common. If you find a big school of tuna you can get tons of fish in an hour. The hooks dont have a barb and a silver head with a feather. You simply shake the pole and the fish falls off. The salt water spray creates a foam and disguises the hook. Not shown in this video live sardine bait is thrown into the spray area. This attracts the tuna while they get some sardine they also get the hooks which is camouflaged by the spray foam.
While this type of fishing is better than nets or longline because it is specific to skipjack and yellowfin and not other random fish or sea creatures.
However this type is now banned in many places because it requires the capture of sardines by net at night from local bays or inlet. One boat can clean out a whole bay of sardines in one night. This has a huge impact on indegenous villagers who rely for food on the sardines and the larger fish that enter the bay to feed. It may take months or even years for the bsy ecosystem to return to normal after a 'tuna boat' has cleaned out the sardines.