THE BIOLOGICAL ASPECTS OF MACKEREL TUNA (EUTHYNNUS AFFINIS) AND THE TECHNICAL ASPECTS OF THE MILLENNIUM GILLNET FISHING IN THE ESTUARY OF PATI REGENCY, CENTRAL JAVA, INDONESIA

Millennium gillnet is a construction development of the gillnet using a different net material which is the fiber monofilament strands. The main catch from the millennium net in Puncel is mackerel tuna. The study aims to analyze the technical aspects of millennium gillnet capture fisheries and find out the long-weight relationship and condition factors of mackerel tuna as the main catch of the millennium net. The results of the study showed that the length of mackerel tuna (Euthynnus affinis) from the millennium net catch landed in Puncel fish auction houses ranged from 33.2 - 52 cm with an average length of 43.012 cm FL. The pattern of fish growth is isometric with the equation W = 0.1509L3.0513 (r2 = 0.9898) with the condition factor value K = 1.613. The catches are the target fish and they are generally caught by the snagged and gilled methods. It can be said that a millennium captures fish selectively