An Ethnomathematical Study of Conventional Fish Farming Methods: Geometric Shape and Measurement of the Pond

This Ethnomathematical study investigates the traditional geometric practices and measurement techniques employed in brackish water fish farming in Barangay Guintas, Barotac Nuevo, Iloilo, Philippines. Rooted in cultural knowledge and sustainable practices, the research explores how fish farmers utilize mathematical concept- particularly geometry and measurement- in the construction and maintenance of fish ponds. Using qualitative methods including ethnographic interviews and participant observation, the study identifies three major themes: (1) the geometric shape of the pond depends on the position and affects harvesting efficiency and water flow;(2) the pond’s depth is critical for fish growth, survival, and protection from predators, with a depth of 1 meter for adult fish and 1 foot for seedlings being most effective; and (3) traditional bamboo tools are commonly used for measuring pond depth, offering a low-cost and sustainable solution for rural aquaculture. The findings highlight the value of indigenous knowledge systems in optimizing aquaculture practices and suggest practical applications for community-based resource management and environmental sustainability. This research contributes to the broader understanding of how local mathematical practices intersect with ecological resilience and food production in coastal and brackish environments.