| Abstrakt: |
Light Fishing is an effective method to control the behavior of small pelagic fish in FAD areas in order to gain effective fishing using purse seine. This study aims to identify the construction of FADs, the movement of the schooling fish during the day and evening, the movement of the schooling fish to the Light Fishing on the boat, the phase of light transfer from the ship to the FAD raft and the presence of Light Fishing in the FAD raft area. The research was conducted in the period of March to October 2021 in one Bay Waters, Indonesia. This type of research included experimental fishing with direct descending acoustic approach directly on FADs for 60 hauling times. The results showed that generally the average concentration of the schooling fish was at a distance vertically/horizontally from the center of the FADs, namely mackerel scad (Decapterus russelli) at 15/20 [m] during the day, 4/2 [m] in the afternoon, 4/2 [m] at night, 15/20 [m] at the day and 5/2 [m] in the early morning. The distance of bigeye scad (Selar crumenophthalmus) during the day was at 1/2 [m], in the afternoon at 1/0 [m], at night of 15/2 [m], in the morning of 1/2 [m]. Meanwhile, tuna fish (Auxis thazard) was 20/35 [m] during the day, 3/2 [m] in the afternoon, 20/10 [m] at night and 2/2 [m] in the morning. The movement of the schooling fish under the Light Fishing of FAD raft was influenced by moon Light Fishing, current speed, catch volume and predatory fish. Fish behavior and Light Fishing from the center point of FADs can be utilized to increase the effectiveness of purse seine operation while fishing. [ABSTRACT FROM AUTHOR] |
