https://mail.ejournalfpikunipa.ac.id/index.php/JSAI <p>This journal is focus on research article related to fisheries and marine science include any aspects of conservation, management, aquaculture, enginering, biology, chemistry, ecology, ecotourism, environtment, microbiology, social, economic, etc.</p> en-US <div class="page">&nbsp;</div> [email protected] (Dr. Abdul Hamid A. Toha, M.Si) [email protected] (Muhammad Dailami) Thu, 06 Nov 2025 00:00:00 +0000 OJS 3.2.1.4 http://blogs.law.harvard.edu/tech/rss 60 https://mail.ejournalfpikunipa.ac.id/index.php/JSAI/article/view/532 <p>Small pelagic fish resources require sustainable management to maintain their ecological and economic roles in marine ecosystems. One important approach to support sustainable fisheries is understanding the reproductive cycle of fish species. This study aimed to analyze the reproductive performance of bigeye scad (Scomber crumenophthalmus) caught by local fishers in the waters of South Buton, Indonesia. The observed indicators included total length and body weight growth, gonad maturity stage, sex ratio, and spawning season. A total of 370 individuals of S. crumenophthalmus were sampled, with body weights ranging from 58.67 g to 105.46 g per individual. Samples were collected over nine weeks from July to September 2023. The study employed visual morphological analysis of gametes based on the stages of gonadal development (gametogenesis) through gonad maturity stages, supported by descriptive statistical analysis. The results indicated that the growth pattern of S. crumenophthalmus was isometric, meaning that body weight increased proportionally with body length. Gonad development of both males and females occurred from July to August 2023, while gonad maturation, ovulation, and spawning occurred in September 2023. Gonad development stages were identified through morphological differences including oogenesis, previtellogenesis, vitellogenesis, maturity, ovulation, and spawning phases. The captured population was dominated by males, while female individuals were capable of reproducing throughout the year, supporting the sustainability of S. crumenophthalmus resources in South Buton waters.</p> La Ode Muhammad Rujiman Rujiman, Aslan Irunsah, La Suriadi, Ida Lapadi, Anjeli S. Paisey, Tutik Handayani, Nurbety Tarigan, Lutfi Lutfi Copyright (c) 2026 La Ode Muhammad Rujiman Rujiman, Aslan Irunsah, La Suriadi, Ida Lapadi, Anjeli S. Paisey, Tutik Handayani, Nurbety Tarigan, Lutfi Lutfi http://creativecommons.org/licenses/by-sa/4.0 https://mail.ejournalfpikunipa.ac.id/index.php/JSAI/article/view/532 Mon, 04 May 2026 00:00:00 +0000 https://mail.ejournalfpikunipa.ac.id/index.php/JSAI/article/view/550 <p>Mangroves are coastal ecosystems, especially in tropical areas including Tomini Bay, Gorontalo Province. Mangrove ecosystems not only function as coastal abrasion barriers, natural protection from ocean waves, but also as plants that are beneficial to human life, especially for coastal communities. . This study aimed to identify and analyze the structure of mangrove communities on the coast of Tomini Bay, Boalemo Regency, Gorontalo Province. Data collection was carried out using the line transect method at four observation stations for the seedling and sapling categories., then analyzed to determine the absolute density, absolute frequency, and dominance of species. Mangroves found in Tomini Bay, Boalemo Regency from the four stations consist of A. marina, B. gymnorhiza, B. parviflora, C. decandra, C. tagal, R. apiculata, R. mucronata, R. stylosa, S. alba, S. caseolaris, X. moluccensis. In the seedling category, the C. tagal mangrove species at station 2 (Dulangeya Village) showed the highest value in Boalemo Regency, with an absolute density of 56 ind/m², an absolute frequency of 0.48, and a relative dominance of 87.5%. On the other hand, the B. gymnorhiza species recorded the lowest value compared to all observation stations in Boalemo Regency, with an absolute density of only 1 ind/m², an absolute frequency of 0.05, and a relative dominance of 1.56%. The C. tagal mangrove sapling category at station 2 (Dulangeya Village) had the highest absolute density, absolute frequency, and relative dominance in Boalemo Regency, at 8.36 ind/m2 and 0.71 and 73.85, respectively. R. apiculata had the lowest density of all stations in Boalemo Regency, at 0.04 ind/m2 and 0.05 and 0.35, respectively</p> Fauzia Zees, Rieny Sulistijowati, Lukman Mile Copyright (c) 2025 Fauzia Zees, Rieny Sulistijowati, Lukman Mile http://creativecommons.org/licenses/by-sa/4.0 https://mail.ejournalfpikunipa.ac.id/index.php/JSAI/article/view/550 Sun, 16 Nov 2025 00:00:00 +0000