Abstract: Understanding the sex ratio and initial gonadal maturity size of fish populations is essential for effective conservation and sustainable fishery management. This study aims to analyze the comparison of sex ratio and initial gonadal maturity size of marble goby (Oxyeleotris marmorata) in Lake Tempe, Wajo Regency, South Sulawesi. The research was conducted over two months, from October to November 2023, with four sampling events, two during the dark moon phase and two during the bright moon phase. A total of 285 individuals were collected, consisting of 118 females and 167 males, using jabba or bubu fishing gear. Sex identification and gonadal maturity determination were conducted at the Fisheries Biology Laboratory, Faculty of Marine and Fisheries Sciences, Universitas Hasanuddin. The results showed that the overall sex ratio was 0.71:1.00 (female:male), with significant male dominance during the dark moon phase and at Station 1 (near agricultural land). Gonadal maturity levels (TKG) ranged from stage I to stage V, with first gonadal maturity sizes varying between moon phases and locations. The smallest first gonadal maturity size was recorded at 175.72 mm for females (Station 1) and 191.65 mm for males (Station 1). These findings provide essential data for supporting sustainable fishery management in Lake Tempe. Show less...

Abstract: Large pelagic fish such as tuna, skipjack, and mackerel are key export commodities for fishers at Bungus Oceanic Fishing Port due to high demand and their importance in processed fish products. This study analyzed trends, sustainable potential, and utilization levels of these resources in the western Sumatra Sea. Research conducted from March 17 to April 1, 2023, used a descriptive quantitative survey and literature review, with catch and effort data from 2015 to 2022 processed using Microsoft Excel. Results showed increasing catch trends, with tuna, skipjack, and mackerel projected to reach 723,417 kg, 462,205 kg, and 706,592 kg by 2025, respectively. The Maximum Sustainable Yield (MSY) estimates were 532,728 kg/year for tuna, 1,047,319 kg/year for skipjack, and 10,445,616 kg/year for mackerel. On average, the utilization rate was 37%, with a fishing effort rate of 24%, both categorized as moderate. Although tuna catches exceeded the MSY in 2021 (109.55% utilization), average exploitation across species remained sustainable. These findings suggest current fishing practices have not yet surpassed ecological limits, providing room for controlled increases in fishing efforts to maximize yields while maintaining ecological balance. Show less...