Reproduction of Indian mackerel (Rastrelliger kanagurta) in North Maluku waters

The understanding of the reproduction of a fish species is an important prerequisite for providing scientific advice for sustainable fisheries management. This study aims to analyze the reproductive parameters of Indian mackerel caught in North Maluku waters. Data analysis used a population parameter approach, using 3,000 mackerels which were caught with a mini purse seine. The parameters analyzed were the length-weight relationship, growth parameters, and gonadal maturity level and fecundity. The results obtained showed that the growth of male and female mackerel in North Maluku waters had a negative allometric pattern, which means that the increase in body length is faster than the increase in weight. The male mackerel reached a maximum length of 335.91 mm at the age of 40 months or 3.4 years, while the female mackerel reached a maximum length of 356.88 mm at the age of 47 months or 3.9 years. The maturity levels of mackerel found consisted of gonadal maturity level I to gonadal maturity level V. Mackerel was found to be dominated by gonadal immature individuals. Highest numbers of male and female mackerel with gonadal maturity were found in May with the respective percentages of 56.78% and 58.19%. Mackerel spawning occurred several times in a season with the peak spawning season found in June and July. The fecundity of female mackerel found in North Maluku waters was 26,764-81,563 eggs.