Gulls are opportunistic feeders and can affect local fish populations, potentially impacting fisheries. This should highlight the study on the gulls and terns of the study area, Cochin fisheries harbour, Ernakulam district, Kerala. The work focused on their ecological role and relationship with the fish catch density also highlight the field surveys and data analysis. The aim of the study was to understand the abundance, distribution and behavior of these avian species, along with their impact on the local fish population. These findings shed light on the intricate ecological dynamics between these birds and the fishing activities in the region. Seagulls play a significant role in the life of a fisherman, both positively and negatively. On the other hand seagulls are bioindicators that help fisherman to locate schools of fish. Common Terns eat mostly small fish, usually no more than 7 inches long. They also steal fish from other tern species, gulls, and themselves, as well as fish that are near the surface or that are caught on the wing. Sea gulls eat fish, insects, reptiles, rodents, and a variety of other items. These omnivorous birds hunt and scavenge with great efficiency. The impact of Gulls and Terns on local fish populations can vary. While these birds plays important roles in ecosystems, they may cause challenges in certain situations. Increased population of gulls and terns can lead to higher predation pressure on local populations. This could result in reduced fish abundance. Changes in fish populations due to seabird fluctuations may have cascading effects on other species within the ecosystem.