Reproductive biology of leaftail croaker (Johnius trachycephalus Bleeker, 1851) in Muara Angke waters of Jakarta Bay, Jakarta

¹ Graduate Program of Aquatic Resources Management, Faculty of Fisheries and Marine Sciences, Institut Pertanian Bogor. Jl. Agatis Kampus IPB Dramaga, Bogor 16680, West Java, Indonesia
² Department of Aquatic Resources Management, Faculty of Fisheries and Marine Sciences, Institut Pertanian Bogor. Jl. Agatis Kampus IPB Dramaga, Bogor 16680, West Java, Indonesia

^* Corresponding author: This email address is being protected from spambots. You need JavaScript enabled to view it.

Abstract

The leaftail croaker (Johnius trachycephalus) is a demersal fish favored by the community and is commonly processed into salted fish. This fish no research has been conducted on the reproductive biology of the leaftail croaker in the Muara Angke Waters, this research is very important to carry out considering the lack of biological information. This study aims to analyze the reproductive biology of the fish in Muara Angke coastal waters as a basis for sustainable management, including sex ratio, spawning season, reproductive potential, and spawning pattern. This research was conducted in the Muara Angke coastal waters for 6 months (August 2024 – January 2025). The data collection was carried out using primary data, starting from fish sampling, dissection, and ending with gonad extraction. The results show that the sex ratio of the fish was 0.6:1, and it was dominated by females. The spawning season is estimated to occur in August and December. The size at first gonadal maturity of the fish was 260 mm (male) and 159 mm (female). The reproductive potential of the fish ranged from 15,486 to 82,830 with a partial spawner spawning pattern. According to oocyte diameter, the fish is categorized as a partial spawner. The implication of this study was the reduction of fishing intensity that was suspected to occur during the spawning season, as well as the reduction of the capture of small sized fish.