Tuna fishing

There are many ways to catch tuna, and now the most popular one is longline fishing.

Longline fishery can be divided into three types: floating longline, bottom longline and middle longline. Tuna longline fishing gear is mainly composed of dry rope, branch line, float, floating line, fishing hook, etc., that is, a number of branch ropes with hooks are hung on the extended dry line to catch tuna. A number of floats are tied to the dry rope, and the length of the floating rope and branch rope between the dry rope and the float plays a role in regulating the fishing water layer. The hook needs to be loaded with erh material. The main ingredients are frozen bamboo swordfish, squid, sardines, mackerel and so on.

I. exploratory arrest

First put down a small amount of fishing line, usually about 500 hooks, and then judge the central fishing ground according to the catch the next day.

Second, release the line

The main results are as follows: 1. According to the feeding characteristics and vertical law of tuna, the best time is 3: 00 in the morning.

2. With the postponement of moonlight rise and fall, the release time will also be delayed. If the line is released too early, the bait will be swallowed by other fish before the tuna is eaten.

3. The direction of laying-out should be crosscurrent or oblique flow. Generally speaking, tuna likes to feed against the current, one is that the direction of the line is perpendicular to the direction of the current, this method intercepts a large cross section, which can provide a reference for the width of the next release. A better way is to take a "V" shape perpendicular to the current, which increases the chances of being hooked by the same school of fish.

4. The speed of the ship should be 8Mui 9 knots, and the observation can be made with the help of the guard guide. For example, fishing for bigeye tuna can reduce the speed of the ship accordingly and make the line deeper.

5. when releasing the line, it is not a big problem for the two ships to intersect, but do not fish parallel with other vessels within 5 nautical miles, otherwise the fishing lines may be entangled. When releasing the line, keep the starboard side under wind or current, and the bait should be thrown upstream, otherwise it will cause the branch line to take up the main line, so that the hook can not be extended effectively and affect the fishing effect.

March, the moon black water operation (refers to the night without moonlight)

Because of the phototaxis of tuna, the catch will increase on a night with better moonlight. On the contrary, it will be reduced. The dark sky is not because there is no fish, but because the light intensity is weak, the floating water layer of the small fish can not reach the original water layer, in addition, in the black water weather, due to the rapid current, the fishing line forms an educational slope, and the hook can not reach the original depth, so the fishing effect is very poor.

The following methods can be taken to overcome this problem:

1. Extend the floating chord ratio

2. Lengthen the length of the branch line, change the float-to-sink ratio, and increase the lead drop.

3. Avoid the rapids and find a relaxing fishing ground

4. Go offline slowly to make the line deeper.

IV. Starting line

When starting the line, first of all, according to the electrical signal measured by the direction finder, the hook was found. So that the ship and the line at an angle of 30, the boat with the line, the speed is not too fast, 6 knots of speed is appropriate, when there is fish, the speed of the ship should be slowed down, and reverse. This does not make the fish swim to the bottom of the boat, so it is easy to pick up the fish. Temporarily remove the floats, feeder lines, radio buoys and buoy lights from the main line and sort them out. Check the main line and branch line. If you find any damage, cut it and connect it immediately. The main line is directly twisted into the main barrel after the ship. After the feeder line is arranged and loaded, it is transported to the rear deck where the hook is placed, and the float is also transported to the aft deck float cabin.