Structure of size and growth pattern of frigate mackerel (Auxis thazard) in fish landing base of ujong baroh meulaboh
Hamidi, Jaliadi, Muhammad Rizal
Frigate mackerel (Auxis thazard) is a pelagic fish and belongs to a member of the family Scombridae. It is found in almost all tropical and subtropical seas, and even often found in Indonesian waters, especially the waters of West Aceh. Information related to the growth pattern of the fish provides a fundamental advantages for the management of fishery resources in the waters of West Aceh. This research aimed to investigate the length and biological characteristics of frigate mackerel landed on Fish Landing Station (PPI) of Ujong Baroh Meulaboh. The fish length was determined through observation and measurement. The fish samples were randomly taken twice a week from January 2016 to July 2016. The frequency of the fish length for the determination of class interval was analyzed using distribution formula, while FISAT II program was applied to assess biological characteristics. The results showed that the length of frigate mackerel caught by boat seine (Pukat payang) was 19-46 cm. From January to July 2016, the length of the fish is dominated by size 34 and 35 cm, from February to June 2016, the length of the fish is dominated by size 22 and 25 cm. The length of a fish with the first thought was 31.51 cm with asymptotic length L∞ of 48.3 cmFL, growth rate K of 0.86 years-1, while the growth rate of fish at zero length (t0) was 0.119 years-1. The results also showed that total mortality Z and natural mortality M were 1.48 years-1 and 1.46 years-1, respectively, while fishing mortality F and exploitation rate E was 0.02 years-1 and 0.01 years-1, respectively.