Some biological stock indicators of red bigeye (priacanthus macracanthus cuvier, 1829) in Palabuhanratu waters, Indonesia

Abstract

The potential of demersal fish resources in the waters of South Java is 7,902 tons with exploitation rates of 0.39. This low level of exploitation shows that increasing the utilization of this fish in South Java can still possible. The Red Bigeye fish (Priacanthus macracanthus), or Swanggi as known by local name is one of the economically valuable demersal fish from Family Priacanthidae. This study aims to examine several indicators of Priacanthus macracanthus biology stock as a basis for the sustainable management of this species. The research was conducted in February-December at PPN Palabuhanratu, Indonesia. The results showed that the spawning season takes place in May-July 2019. The sex ratio between male and female fish is balanced. The growth pattern is negative allometric with a value of b = 2.7379. Distribution of length ranges from 11.8 to 36.0 cm TL (total length) with an average of 23.32 cm TL. The average length of the first catch (Lc) was 21.58 cm, and the average length at first maturity (Lm) was 19.87 cm. The growth equation of Von Bertalanffy is L (t) = 35.45 [1-e0.72 (t - 0.8143]. The fishing mortality rate is (F = 1.52), slightly greater than the natural mortality (M = 1.40), and the level of exploitation (E) is 0.52. The estimated spawning potential ratio (SPR) of this fish is 24%, which means slightly exceeding the optimum exploitation rate.