ABSTRACT
Mackerel Tuna (Euthynnus affinis (Cantor, 1849)) is one of the fish that is widely used and found in North Gorontalo Waters. Utilization of pelagic fish in Sulawesi sea waters has increased from year to year so the sustainability of fish can be threatened. Estimation of size at first maturity is one way to determine population development in water. This study aims to determine the relationship between gonad maturity stages and the fecundity of Mackerel Tuna in North Gorontalo Waters. This research was carried out in October-November 2021 at the Kwandang Archipelago Fishing Port. Gonad maturity stages were observed morphologically and the determination of fecundity was observed using volumetric and gravimetric methods. Based on the results of the research that has been done, it can be concluded that the maturity stage of Mackerel Tuna in North Gorontalo waters is dominated by stage I. The fecundity value ranges from 600-47,400 eggs. The relationship between the gonad maturity stages and the fecundity obtained is directly proportional, if the gonadal maturity value is high, the fecundity value will also be higher. The spawning season for Mackerel Tuna in North Gorontalo waters does not take place in October-December, this is characterized by low fecundity. Based on the monthly GSI value, the peak spawning of Mackerel Tuna (Euthynnus affinis) is thought to occur shortly after the highest GSI value.
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