By: Tri Abdul Rahman, Bahtiar & Dedy Oetama
The Langkumbe River, situated in the West Kulisusu District, has served as a vital resource for the local community, facilitating various daily activities over an extended period. Among the resources extensively utilized by the populace along the Langkumbe River are pokea clams. This study aimed to ascertain the production and biomass metrics of pokea clams (Batissa violacea) within the Langkumbe River Waters of North Buton Regency, spanning from August to October 2017.
Sampling was conducted utilizing the swept area method employing a traditional fishing gear known as "Tangge." The sampled clams underwent measurements for length, width, and thickness. Total weight was assessed, encompassing both the clam and its meat. Subsequently, the samples underwent a drying process in an oven for 24 hours at 70°C to ascertain the shell-free dry mass (SFDW). Data analysis was conducted utilizing standard formulas.
A total of 1,307 individuals were sampled, revealing the highest density of pokea clams in August, reaching 596.8 individuals per square meter (ind/m²). The annual production of pokea clams (B. violacea) within the Langkumbe River was determined to be 1,107.33 grams of SFDW per square meter per year. Notably, the highest and lowest production rates were recorded at 297.09 grams of SFDW per square meter per year for clams sized between 2.19-2.54cm and -0.16 grams of SFDW per square meter per year for clams sized between 4.70-5.05cm, respectively.
The total population biomass was calculated at 528.03 grams of SFDW per square meter, with the highest biomass observed at 171.72 grams of SFDW per square meter per year for clams sized between 2.55-2.90 cm, and the lowest at 1.40 grams of SFDW per square meter per year for clams sized between 4.70-5.05 cm. Consequently, the recovery rate (P/B ratio) was determined to be 2.1 grams of SFDW per square meter per year.
Source: Jurnal Moluska Indonesia
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