Explore the vast range of titles available.

Geloina expansa is a front-runner commodity of the mangrove ecosystem. This species is notably experiencing ecological pressures in Kendari Bay. Accordingly, this study aims to determine their production, biomass, and turnover in the mangrove ecosystem. This research is hoped to provide empirical information that will aid in the formulation of the management strategy of mangrove clam resources in Southeast Sulawesi. Clam samples were collected at random in three selected sampling areas using a 1x1 m 2 quadrat-transect sampling approach. The clams were measured for their shell length, total weight and weight of fresh meat. The clam meat was dried to obtain a shell-free dry mass. The production, biomass, and turnover of the clams were calculated using standard formulas. The population density of the clams ranged from 23.78 ind/m 2 (October) to 77.44 ind/m 2 (February), where the remaining months of observations showed similar values throughout. The clams biomass population in each size class ranged from 0.04 to 4.95 g/m 2 . The somatic production, as per the dry weight showed the highest value at 6.9 cm shell length (2.01g/m 2 /year). The lowest individual somatic production was found in the shell width of 9.7 cm (0.55 g/m 2 /year). The turnover rate (P/B) of the mangrove clam was 1.73/year. The density of the mangrove clams in the mangrove forest in Kendari Bay was found to be high. This was accompanied by high productions in the young or small-sized groups, peaking at a size smaller than the size where peak biomass was found.

Horse mussels are bivalves found in Kendari Bay and are frequently consumed by the people in the surrounding coastal communities. The population dynamic of this mussel species in Kendari Bay is not yet fully understood. This study aims to determine the size structure, growth, mortality, and exploitation rate of horse mussels in Kendari Bay. This research was carried out in Kendari Bay on the outskirts of Southeast Sulawesi, Indonesia, from January to December 2019. Horse mussel samples of all different sizes were randomly collected from different points of the area of the mussel habitat. The collected samples were counted in total, and their shell length was measured using a caliper with an accuracy of 0.05 mm. The size, growth, mortality, and exploitation rate data were analyzed using the Bhattacharya method, inverse von Bertalanffy, Pauly empirical, and length-converted catch curve accommodated in the FISAT II. The results showed that the horse mussels comprised two dominant size groups, with one dominating most of the months. The asymptotic length (Lo) of the mussels was 9.7 cm, with a growth coefficient (К) of 1.1 yr. Moreover, the growth performance index of the mussels was (@)'=2.01 yr\"!, and the maximum age (Tmax) Was 2.73 years. The generated inverse von Bertalanffy equation for the horse mussels was Lt =9.7-(9.7-0.025)e-!-!. The natural mortality (M), fishing mortality (Е), and total mortality (Z) of the horse mussels were 2.73 yr}, 1.17 yr!, and 3.90 yr\"!, respectively. The horse mussels in Kendari Bay were well within the underexploited category, with an exploitation rate of 0.30.

Freshwater prawns of the genus Macrobrachium are widely distributed across tropical and subtropical regions. On Ternate Island, the local community refers to native freshwater prawns as \"udang galah\", a name typically associated with Macrobrachium rosenbergii. This study aimed to accurately identify freshwater prawn species on Ternate Island using DNA barcoding. Prawn samples were collected from two different locations on Ternate Island: Togafo River, which has a steep gradient and flows directly into the sea without being affected by tidal salinity, and the river in Fitu Village, which consists of isolated pools with no connection to marine waters. Tissue samples were taken and preserved in 96% alcohol for molecular analysis. DNA barcoding results confirmed that the identified species is Macrobrachium lar, with genetic similarity ranging from 99.50% to 99.83% to reference data in GenBank. The presence of M. lar in isolated freshwater habitats raises questions about its dispersal patterns and life cycle, as this species is amphidromous and typically requires brackish water for larval development. These findings suggest the possibility of local adaptation or alternative dispersal mechanisms that warrant further investigation. Additionally, this study highlights the effectiveness of DNA barcoding for species identification, particularly for Macrobrachium species With high morphological variation or classified as cryptic.