Currents dragged thousands of dead sardines onto the beaches of Taboga Island on Sunday.
Initial reports indicate that the dead fish came from an accidental breach in an unnamed fish meal factory.
Taboga Mayor Jose Chiru said authorities should take measures to avoid these situations since the island receives between 500 and 700 visitors on weekends, and the dead fish are alarming.
Fish meal is a nutrient-rich and high protein supplement feed ingredient made from ground dried fish. It is primarily used in diets for domestic animals and sometimes as a high-quality organic fertilizer.