Tuna and 10+ interesting facts not everyone knows
Tuna and 10+ interesting facts not everyone knows Tuna and 10+ interesting facts not everyone knows. Tuna is widely distributed in many parts of the world in tropical or temperate waters, including Vietnam, which are exploited the most in the South Central Coast. Quang Ngai, Binh Dinh, Phu Yen, Khanh Hoa,. Common name: tuna Scientific name: Thunnus Sector: live animals Diet: predators Grade: ray ray Department: Sea bass They are: tuna fish or silverfish Weight: 0.5 – 4kg for small size species; 1.6 – 64kg for oceanic migratory species Size: 140 – 750mm for small size species; 240 – 2000mm for oceanic migratory species Life expectancy: 10 – 12 years Characteristic and ecological Tuna with long, slender body, slightly flattened sides; crescent-shaped tail Large eyes, scales on the body very small, concentrated in the back near the head The back is dark blue; lower body and abdomen white The dorsal fins are close together, the first dorsal fins are dark yellow, the dorsal and posterior fins are pale yellow, and the dorsal fins have small, yellow fins with black borders. pectoral fins are quite long Tuna is usually concentrated in the herd and migrates along with some other species Tuna matured when 4-5 years old with a size of 89 – 94cm, males are larger than females. Their average life is about 10-12 years in nature Reproductive behavior Tuna breeding season usually falls in the summer. They lay eggs, each adult tuna can lay 2 – 3 million eggs per breeding season and is divided into two times, the next time the previous two days. Tuna in addition to female laying eggs, then the male sperm discharge into the water; The surface of the egg is covered with a lubricant to help the egg float After 48h fertilization, the eggs will hatch into fish Harvesting season In Vietnam, the tuna fishing season consists of two seasons: the main season starts from April to August and the season starts from October to February. For tuna fishing, fishermen often use purse seines, gill nets, fishing rods or sign Tuna is widely exploited to serve the large consumption of seafood inland and even export to other international markets such as USA, Japan, European countries and some Asian countries. Do not miss: Mackerel and 10+ basic information to know Common tuna in Vietnam Based on body size and migration behavior, tuna in Vietnam is divided into two subgroups: – Small tuna, local distribution This group is small, about 140 – 750mm and weighs about 0.5 – 4kg, including: Tuna oh English name: Bullet tuna Scientific name: Auxis rochei (Risso, 1810) Distribution: Central waters Fishing season: all year round Fishing gears: net, lagoon, reed, post Cut size: from 140 to 310 mm, mainly 260 mm Tuna English name: Frigate mackerel Scientific name: Auxis thazard (Lacepede, 1803) Distribution: Central, East and South West Fishing season: all year round Fishing gears: net, drag, post Harvesting size: 150 – 310 mm, mainly 250 – 260 mm Tuna sauce English name: Eastern little tuna Scientific name: Euthynnus affinis (Canner, 1850) Distribution: Central and Southern waters Fishing season: all year round Fishing gears: net, drag, post Harvest size: 240 – 450 mm, mainly 360 mm Tuna English name: Longtail tuna Scientific name: Thunnus tonggol (Bleeker, 1851) Distribution: Gulf of Tonkin, Central, South West Fishing season: all year round Fishing gears: Fishing net, fishing rod, fishing net Cutting size: 400 – 700 mm Tuna Striped Melon English name: Striped tuna Scientific name: Sarda orientalis (Temminek & Schlegel, 1844) Distribution: Tonkin Gulf, Central Coast Fishing season: all year round Fishing gear: post, drag, fin, hook, roller Cutting size: 450 – 750 mm – Tuna migrate to the ocean Tuna or ocean tuna is a large species, about 240 – 2,000mm and weighs about 1.6 – 64kg, including types Skipjack English name: Skipjack tuna Scientific name: Katsuwonus pelamis (Linnaeus, 1758) Distribution: Central waters, high seas Fishing season: all year round Fishing gears: gill net, fin, yellow line, jerk, hook Cutting size: 240 – 700 mm, mainly 480 – 560 mm Yellowfin tuna English name: Yellowfin tuna Scientific name: Thunnus albacares (Bonnaterre, 1788) Distribution: offshore areas of Central and Southeast Fishing season: all year round Fishing gear: gold, drag, post Harvesting size: For gillnets, the size ranges from 490 – 900 mm, for gold fishing 500 – 2,000 mm. Bigeye eyes English name: Bigeye tuna Scientific name: Thunnus obesus (Lowe, 1839) Distribution: in the offshore areas of Central and South East Fishing season: all year round Fishing gear: gold, drag, post Cutting size: 600 – 1800 mm Tuna food Tuna is a predator. Their food is mainly sardines, drumsticks, sardines, herring, squid, squid, crustaceans, even larval and plankton. Tuna has a high metabolic rate, so they need large amounts of food each day, about a quarter of their body weight to meet the energy requirements needed to grow and grow well. Some other interesting facts Every year, tuna travels a distance far beyond the reach of food-rich waters and spawns. Tuna swim very fast, they are capable of swimming at speeds up to 80km / h In the wild, tuna must swim continuously to ensure normal breathing When swimming, tuna always opens its mouth, consuming a large amount of oxygen-rich water to move into the gills.