2. With the delay of the rise and fall of moonlight, the pay-off time will also be delayed. If it is released too early, the bait will be swallowed by other fish before the tuna is eaten.
3. Pay-off direction should be cross flow or oblique flow. Generally speaking, tuna likes to feed against the current. One is that the pay-off direction is perpendicular to the direction of water flow. This method has a large cross section, which can provide reference for the next pay-off width. A better way is to form a "V" shape perpendicular to the current, which can increase the chance of the same fish being hooked.
4. The line speed should be 8-9 knots, which can be observed by the guide. For example, the speed of the line can be reduced accordingly to make the line deeper.
5. When paying off the line, it is not a big problem for two ships to cross, but don't fish in parallel with other ships within 5 nautical miles, otherwise the fishing line may get entangled. When paying off, keep the starboard side exposed to wind or current, and the bait should be thrown upward, otherwise, the branch line will take the main line, and the hook will not extend effectively, which will affect the fishing effect. Due to the phototaxis of tuna, the catch will increase on a better moonlight night. On the contrary, it will decrease. It's not that there are no fish in the dark and windy month, but because of the weak light intensity, the floating water layer of small fish can't reach the original water layer. In addition, when it is dark, the fishing line forms a big slope because of the relatively fast water flow, and the hook can't reach the original depth, so the fishing effect is very poor.
The following methods can be taken to overcome this problem:
1. Extended floating chord length ratio
2. lengthen the length of branch line, change the floating-sinking ratio and increase the lead drop.
3. Avoid the rapids and find a fishing ground with slow water flow.
4. Slow down the line and make it deeper. When starting the line, first find the hook according to the electrical signal measured by the direction finder. The ship is at an angle of 30 degrees to the cable. The speed of the ship should not be too fast, and the speed of 6 knots is appropriate. When there are fish, slow down and reverse the boat. This will prevent the fish from swimming to the bottom of the boat and facilitate fishing. Temporarily remove buoys, branch lines, radio buoys and buoy lights from the main line and arrange them. Check the trunk and branch lines, and cut and connect them immediately if any damage is found. The main line directly twisted into the main line barrel behind the ship. After the feeder is bagged, it is transported to the place where the hook is placed on the back deck, and the float is also transported to the float cabin on the back deck.