REPRODUCTIVE BIOLOGY OF FRIGATE TUNA (Auxis thazard Lacepède, 1800) CAUGHT BY FISHERMEN IN WEST SUMATRA WATERS

Andhini, Nur Bintari (2024) REPRODUCTIVE BIOLOGY OF FRIGATE TUNA (Auxis thazard Lacepède, 1800) CAUGHT BY FISHERMEN IN WEST SUMATRA WATERS. S1 thesis, Universitas Andalas.

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Abstract

Frigate tuna (Auxis thazard) plays an important role in the fishing industry in West Sumatra. The increasing demand for frigate tuna makes this fish continue to be exploited. Exploitation carried out continuously can reduce frigate tuna production, so research needs to be done. The research was conducted to: (1) Know the growth pattern and factor condition of frigate tuna (A. thazard) in West Sumatra waters; (2) Know the reproductive biology of frigate tuna (A. thazard) which includes Sex Ratio, Gonad Maturity Level (GML), Gonad Maturity Index (GMI), and Fecundity in West Sumatra waters. Sampling was conducted at the Air Bangis Fish Landing Base (PPI) in West Pasaman Regency and the Gaung Fish Landing Site (TPI) in Padang City in July 2023. The research and data analysis was conducted from February to August 2024. Samples were obtained from the catch of fishermen in West Sumatra waters. Sampling was done randomly, samples were measured in length and weight, dissected to determine sex ratio, gonad maturity level, gonad maturity index, and fecundity. The results showed the length of fish ranged from 350 – 475 mm, with an average of 401.48 mm and a weight of 408 – 1,339 grams with an average of 755.8 grams. The growth pattern is positive allometric (b>3) which means that weight gain is faster than the increase in length. The condition factor is in stable condition with an average of 1.24. The sex ratio is in an unbalanced condition with a ratio of males and females of 0.9: 1. The level of gonad maturity obtained is GML III and GML IV. The gonad maturity index of male fish ranged from 1.71 – 3.04 and female fish 1.28 – 2.50. Estimated fecundity ranged from 261,468 – 775,590 grains. From several reproductive biology parameters used in this study, it can be concluded that the reproductive biology of frigate tuna in West Sumatra Waters is still in good condition.

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