The stock assessment of Siganus spp. in the seagrass ecosystem Aacl Bioflux, 2025
Utilization of horizontal nets in eliminating attachment of epiphytes on thallus of Kappaphycus alvarezii Aacl Bioflux, 2025
Profitability Analysis of the White Leg Shrimp (Litopenaeus vannamei) Cultured at Different Stocking Densities in Brackish Ponds Riani et al. Egyptian Journal of Aquatic Biology and Fisheries, 2025 Over the past decade, the cultivation of the vannamei shrimp (Litopenaeus vannamei) has expanded across Indonesia’s coastal regions due to its superior adaptability and economic potential compared to other shrimp species. Optimizing stocking density is crucial for maximizing productivity and profitability in shrimp farming. This study aimed to analyze the productivity and profitability of the vannamei shrimp cultivated under different stocking density systems in brackish water ponds. A census-based sampling approach was used to collect data from shrimp farms employing various stocking densities. Key production factors recorded included seed quantity, land area, feed usage, fertilizers, pesticides, probiotics, labor, supplements, shrimp yield, sales price, and water quality parameters. The collected data were analyzed using a t-test to determine statistical significance in profitability among different farming systems. The findings indicated that stocking density significantly impacts profitability. Among the cultivation systems analyzed, the intensive farming system with a stocking density of 208 shrimp/m2 yielded the highest productivity and profitability, demonstrating superior economic performance compared to other systems. Intensive shrimp farming at 208 shrimp/m² is the most profitable system, suggesting that farmers should consider optimizing stocking density to enhance financial returns. Further research is recommended to assess long-term sustainability and environmental impacts.
Comparison of growth rate of seaweed Kappahphycus alvarezii using horizontal net and longline methods Aacl Bioflux, 2024
Diversity and characteristics of the habitat of groupers (genus Epinephelus) in Moramo Bay, Southeast Sulawesi, Indonesia Aacl Bioflux, 2024
Population dynamics of mud clam Geloina expansa (Mousson, 1849) in degraded mangrove area at Kendari Bay, Indonesia Bahtiar Bahtiar, Ma’ruf Kasim, Yustika Intan Permata Hati, Ermayanti Ishak Biodiversitas, 2024 Abstract. Bahtiar B, Kasim M, Hati YIP, Ishak E. 2024. Population dynamics of mud clam Geloina expansa (Mousson, 1849) in degraded mangrove area at Kendari Bay, Indonesia. Biodiversitas 25: 616-623. Mud clams, Geloina expansa (Mousson, 1849), locally known as kalandue, are bivalves living in mangrove forests. These mud clams are currently experiencing ecological pressure, and are susceptible to the degradation of mangrove areas and the exploitation of the clams. This research was conducted in the mangrove forests of Kendari Bay for a year, from November 2016 to October 2017. Geloina expansa samples were collected throughout the mangrove forest area, and the water temperature was measured simultaneously with G. expansa sampling. The width of G. expansa shell was measured using a caliper. Population structure, growth, mortality, and exploitation rate data were analyzed using the Bhattacharya method, the von Bertalanffy inverse function, the width converted catch curve, and Pauly's empirical formula, all accommodated in the FiSAT II program version 3.0. The results showed that the G. expansa population was spread out from two and three-size groups, i.e., juvenile, adult, and old-size groups, dominated by the older group. Geloina expansa growth model follows the Lt = 10.08-(10.08-0.025) e-0.6t, which generally consists of 1.5-2.5 years of maturity. The total mortality (Z) of G. expansa was 2.26, in which the highest contributing factor was natural mortality (M) as opposed to fishing mortality (F), with values of M = 1.72 and F = 0.56. Thus, the exploitation rate (E) was within the low category, with a value of 0.24.
Reproductive biology of mangrove clams Geloina expansa (Mousson, 1849) from mangrove at Kendari Bay, Southeast Sulawesi, Indonesia Bahtiar, Muhammad Fajar Purnama, Maruf Kasim, Ermayanti Ishak Marine Biology Research, 2023 Mangrove clams are found in the soft substrates of the mangrove forest, where they reproductively adjust to the conditions in the aquatic environment. This study aimed to determine the reproductive biology pattern, such as sex ratio, gonad maturity level, gonadosomatic index, fecundity and size of the first maturity of mangrove clams. The samples included 80 ind./month collected manually from the mangrove ecosystem for one year. The reproductive biology patterns were calculated using standard formulas, each analysed using the χ2 test, semi-quantitative descriptive evaluation and non-linear regression. The results showed that more males than females were collected, accounting for 80.0–96.5% and 3.4–20.0%, respectively. Furthermore, both sexes’ gonad maturity developments coincided. The mangrove clam’s mature gonads are discoverable all year by observing the gonadosomatic index IV and spawning monthly occurrence. Their maturity peaked (levels III and IV) in February–April, indicated by a high index value ranging from 3.9–18.2 and 4.3–21.9 for the male and female mangrove shells, respectively. The male clams also had smaller sizes at maturity than females at 3.0 and 5.2 cm lengths, respectively. The food (organic sediment) availability was an essential environmental parameter in developing gonadal maturity.
The ecological potential of mangroves in the development of coastal eco-tourism areas: A case study of mangroves in North Buton District, Indonesia Aacl Bioflux, 2023
Seaweed cultivation technologies in Indonesia: Current trends and future prospects Ma’ruf Kasim, Abdul Muis Balubi, Wardha Jalil, Oce Astuti, Bahtiar, Wellem Muskita, Nurdiana, Onu La Ola, Abdul Rahman, Rahmad Sofyan Patadjai, Budiyanto, Utama Kurnia Pangerang, Ruslaini Sustainable Global Resources of Seaweeds Volume 1 Bioresources Cultivation Trade and Multifarious Applications, 2022
