or albacore (Thunnus alalunga)
The white tuna (Thunnus alalunga) reaches a great speed, has the body in the form of a torpedo, smooth skin and aerodynamic fins. This fish is characterized by having a first dorsal fin of dark yellow color and a second dorsal fin of pale yellow color. The pectoral fins are located on each side of the body being exceptionally long and shaped like a crescent moon, the deep bifurcated caudal fin helps generate the energy necessary for this species to maintain an impressive speed. The white tuna is dark blue metallic in the back part, with the sides and the belly of silvery white color.
Alalunga, Tuna, Longfin Tuna, White Tuna, Bonito del Norte, Albacore.
Sizes: Weight: up to 40 kg.
Biology. The white tuna forms shoals that can be up to 30 kilometers wide. They are sometimes associated with floating objects such as sargassum and may also form mixed banks with other tuna species such as yellowfin tuna and bluefin tuna. In these schools, the albacore tuna undertakes large migrations in search of better feeding and spawning areas, strongly influenced by large oceanic phenomena such as El Niño. This species is capable of impressive speeds of up to 80 kilometers per hour due to its highly developed circulatory system that reduces the heat loss generated by the increase in muscle activity. This allows them to maintain their body temperature at a higher level than the water that surrounds them, keeping their muscles warm to work efficiently. Unlike many fish, albacore tuna is not able to pump water through its gills to get oxygen from the surrounding water and therefore needs to constantly swim with its mouth open for water to pass through its gills. The high volume and pressure of the blood, as well as the high concentration of hemoglobin, increases the ability of these fish to absorb the oxygen they need.
They are thought to be pelagic spawners, which means that the female releases its eggs and the male its sperm in open water, often near the surface of the water. A female white tuna is capable of producing two to three million eggs per spawning season that are released in at least two batches, despite this, most of these eggs do not survive to become adults. The small eggs are only one millimeter in diameter and are enclosed in a droplet of oil so they can float in the ocean. The eggs are fertilized by the male and develop rapidly, hatching occurs in less than 48 hours.
Albacore tuna is one of the largest carnivores in the ocean regions where it lives and feeds voraciously on schools of small fish such as sardines, anchovies and squid, consuming about 25 percent of its weight every day. White tuna becomes prey to the largest species of tuna, swordfish and sharks.