Gleaning of fishery of conch (Gastropoda: Strombidae) in seagrass beds of Guimaras Island, the Philippines
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Abstract
Gleaning is a subsistence fishery vital to the lives of coastal communities. The gastropod conch is among those found abundant in gleaners’ catch, particularly observed in Nueva Valencia, Guimaras, the Philippines. Three adjacent barangays with a wide expanse of seagrass intertidal area were studied for aspects of conch gleaning fishery through a structured questionnaire and the conduct of an actual catch survey. Results showed that conch gleaning is a secondary source of income (80%), mainly conducted by women (85%) during low tide. It contributes to their food consumption and additional income, where a kilo of conch is sold fresh and unprocessed at PHP 50–60, contributing to their monthly income at PHP 500–1000 maximum and PHP 100–200 minimum. Six species of conch were identified from the actual catch survey. Gleaning time ranges 2–4 h/d at 0.2–0.6 kg/h CPUE. An estimated 1,728–5,184 kg of conch, or around 180,000–550,000 individuals, may be exploited annually based on actual catch calculations. These levels of exploitation may pose a risk to the sustainability of the resource. An observed decline in the abundance of conch for the past 20 years, where management measures such as limitations on conch size and collection volume were indicated by the respondents. As an undocumented fishery in the Philippines, this study presented the importance of conch gleaning in the livelihood of coastal residents and may serve as vital information for fishery policy recommendations. This study also showed that the use of an actual catch survey, aside from a questionnaire, enhanced the data and earned better interpretation of results.
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actual catch survey gleaning survey questionnaire invertebrate fishery management subsistence fisherySuggested Citation
Diamante, R. A., Monteclaro, H., Altamirano, J., & Santander - de Leon, S. M. (2025). Gleaning of fishery of conch (Gastropoda: Strombidae) in seagrass beds of Guimaras Island, the Philippines. Philippine Journal of Science , 154(6A), 1467-1482. http://hdl.handle.net/10862/6627
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The mangrove clam Anodontia edentula is highly prized in the Philippines for its flavor and large size. Because this infaunal species is found down to one meter deep in mangrove areas, harvesting the clam reportedly damages mangrove stands. To evaluate such reports, a survey of collection methods was undertaken in Panay and Guimaras, central Philippines in August 1997-December 1999. Host to chemosynthetic bacterial symbionts that utilize sulfide as energy source, A. edentula are strategically situated in sulfide-rich anoxic substrates but also gain access to oxygenated seawater through a ventilation burrow or tube. By locating the opening of this burrow, collectors can detect the presence of a buried clam and harvest it nondestructively with a blade or bare hands. In contrast, the indiscriminate tilling of wide mangrove areas can damage mangrove plants. Most collectors were 40-45 years old with 22-30 years collection experience, married with 5-7 children, and had low educational attainment. They sold clams directly in the local markets or through middlemen (to restaurants and beach resorts); sales provided from 10% to 100% of daily family income. Collectors complained of decreasing clam sizes and numbers and the physically strenuous work of collecting.
