World Tuna Day is observed annually on May 2 across the world to spread awareness and highlight the significance of tuna fish in marine biodiversity, economic development, and worldwide food security globally. This International Day raises concerns or worries or awareness about the overexploitation or overfishing of tuna fishes and support sustainable fishing practices worldwide. The main aim of this International Day is to raise awareness about the significance of marine and fishing conservation globally.

Tuna are pelagic or oceanic saltwater and large fish, which are known as a source of food in the ocean and belong to the Scombridae, a mackerel family. Tuna fishes are also popular for their speed and capability to swim long distances in oceans. Several different types of species of tuna fish are skipjack, bluefin, yellowfin, and albacore. Most tuna fishes are found in oceans mainly in temperate and warm water and have torpedo or streamlined shaped bodies which helps them to swim fast in the water. Tuna are pelagic or oceanic fish and live in the open ocean, which is away from the coastlines or seabed. They are carnivores or meat-eater fish, which eat plankton and squid fishes.

Tuna fishes are mainly found in warm seas and is commercially as a food fish and is also known for Bluewater game fish.  Due to overfishing, southern bluefin tuna are rapidly reduced and threatened to extinct in oceans, which is a big issue for individuals. Thus, the main purpose of this global day is to reduce overfishing and maintain or conserve the tuna fish in oceans worldwide.