Tinala nga sisi is a traditional practice of extracting the meat of the sisi (rock oysters) harvested from rocks during low-tides. These are then washed clean with seawater, then bottled in saltwater to maintain its freshness. These are sold immediately or cooked within the day to prevent spoilage. Tinala nga sisi is very affordable and sells out almost everyday, providing stable income for families engaging in this activity. However, fluctuating market demand as well as competition from other seafood options affect the practice as sisi has a very short shelf life. Pollution and habitat destruction also have adverse effects on the abundance and quality of sisi, thereby affecting the viability of the practice.