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The blackfin tuna (Thunnus atlanticus) is a species of tuna in the family Scombridae. It is occasionally referred to as the Bermuda tuna, blackfinned albacore, or deep bodied tunny. They are the smallest tuna species in the genus Thunnus, generally growing to a maximum of 100 cm (39 in) in length and weighing 21 kg (46 lb).
Blackfin tuna are considered tropical, warm water fish. They have a relatively small distribution throughout the Eastern Coast of North and South America. They are located from Massachusetts to Rio de Janeiro in Brazil, and also inhabit the Gulf of Mexico and the Caribbean Sea.
The blackfin tuna has less commercial value than its close relatives like the yellowfin, bluefin, and skipjack tuna, but is still a major sport fish in Florida and regions of the Caribbean like Cuba and the Bahamas. However, the taste and quality of blackfin tuna is comparable to that of its popular relatives, and can be prepared in the same ways. It is also sushi grade. Methods of capture include trolling, drift fishing, and sport fishing with a pole and live bait or lures like ballyhoo, mullet, small fishes or strip baits, feathers, jigs, or plugs.
As of 2010, blackfin tuna were deemed "least concern" by the IUCN.
Description
Blackfin tuna are the smallest species of tuna. The All-Tackle world record blackfin tuna was caught off the coast of Florida and weighed 20.6 kg (45 lb 7 oz). Their oval shaped bodies have a dark blue to black colored back. The sides and belly of the fish are silver, which gives them an iridescent appearance in the water, with a lateral yellow stripe. They have durable, compact scales with an oblique mouth.
Blackfin tuna have small dorsal finlets with a brownish coloration and white edges, a distinguishing characteristic from the yellow dorsal fins seen in other types of tuna. These dorsal finlets draw a line between the two large dorsal fins and the tail. Blackfin tuna can also be distinguished from other types of tuna based on their number of gill rakers. Most species of tuna have a minimum of 30 gill rakers, while blackfin tuna only have 20–23, the fewest of all species. Additionally, blackfin tuna have a smooth ventral surface on their liver found in the chest cavity, while other species have striations on their ventral surface.
Biology/Ecology
Blackfin tuna hunt both epipelagic (surface) and mesopelagic (deeper water) fish and squid. They also eat crustaceans such as shrimp, crabs, amphipods, stomatopods, and the larvae of decapods. They consume smaller prey by filtering the water and chase to catch larger prey.
This species is host to 9 known parasites including Digenea, Monogenea, cestoda, nematoda copepods, and cookiecutter shark. The remaining parasites are parasitic copepods like caligus coryphaena, C. productus, Euryphorus brachpterus, and pseudocycnus.
Life History
They are a short-lived, fast-growing species; a 5-year-old fish would be considered old. They reach sexual maturity at the age of 2 years when they weigh roughly 4–6 lbs. Juvenile stages of all Tuna species are very similar due to close life histories, although the species have significant differences as adults.
Spawning typically occurs off the coast of Florida in the months between April and November. In the Gulf of Mexico and near northern Brazil spawning occurs from June to September. In fact, the Gulf of Mexico is thought to be one of the most ideal spawning sites for blackfin tuna. The physiochemical make-up of the Gulf of Mexico makes it an indispensable nursery habitat. One factor potentially influencing the favorable conditions of the Gulf of Mexico is the nutrient outflow from the Mississippi River; this outflow feeds the high metabolism of larval blackfin tuna.
Blackfin tuna are a warmer-water fish, preferring water temperatures over 20 °C (68 °F). The females release eggs into the water column to be fertilized by sperm. Fertilization of their eggs produces pelagic larvae which can be found on the surface of the water all the way to depths of 164 feet.
Blackfin tuna are preyed on by other, larger fish species such as mahi-mahi (Coryphaena hippurus), blue marlin (Makaira nigricans), and skipjack tuna (Katsuwonus pelamis). Various species of sea birds prey on blackfin tuna throughout their life cycle, and cannibalism has occurred as well.
Sustainable consumption
In 2010, Greenpeace International did not add the blackfin tuna, unlike other tuna species, to its seafood red list.
References
External links
Media related to Thunnus atlanticus at Wikimedia Commons
Data related to Thunnus atlanticus at Wikispecies
FishBase info for black tuna
Blackfin Tuna Identification
Encyclopedia of Life Info for Thunnus atlanticus
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Artikel Terkait "blackfin tuna"
Recipes for cooking blackfin Tuna | 2 Cool Fishing Forum
29 Jul 2009 · 12 oz seared Blackfin Tuna, cooked to medium doneness. To cook Blackfin Tuna, rub tuna loin generously with a good olive oil, sea salt if available, and freshly ground green or black pepper. Heat a cast iron skillet or heavy metal pan until very hot. Do not oil the pan, too much oil detracts from the sublime flavors of wild caught Blackfin Tuna.
Are blackfin tuna good to eat? - 2 Cool Fishing Forum
05 Feb 2008 · Smoke the meat at 250-300 degrees for 2hrs. Take the meat and grind it up as fine as you can a food prosessor works the best. Add mayo to make a fish dipp or spead. Basically use the meat as if you had opened a can of tuna add what ever you like to it to make tuna salad. 2 hrs seens like a long time.
Diamond Jig Question (Blackfin Tuna Fishing)
10 Feb 2005 · the tuna bite for blackfin can be all night long. the key is fishing the depth they are holding. sometimes they are hitting at 400ft down and sometimes they hit 10 ft under the surface. if the bite is hot use the siwash hook diamond jigs or you will be spending a lot of time trying to get the treble hooks out of the fish. vary your drop and retreive speeds till you figure out how they …
Bleeding Black fin tuna - 2 Cool Fishing Forum
01 Agu 2007 · Bleeding improves the appearance of uncooked tuna loins and may help initially to reduce fish temperature on deck. It is essential for sashimi grade fish. Fish should be bled for 10 to 15 minutes after stunning (brain spiking) and then immediately chilled.
Blackfin Tuna | 2 Cool Fishing Forum
22 Agu 2006 · Blackfin Tuna Jump to Latest 2K views 8 replies 7 participants last post by Tre'
Blackfin tuna off Texas | 2 Cool Fishing Forum
23 Jul 2015 · Bluewater Board (Recreational Fishing) ...
Night time tuna jigging questions | 2 Cool Fishing Forum
25 Jul 2014 · glow, glow pink, glow green , glow chart, charge em up before you drop off a spreader lite. as for the bft , take a 5 gal bucket half full of salt water, when you land a bft , stick a long knife behind his pec fin and aim at the opposite eyeball and give it a wiggle and drop him head down in the water till he quits flopping , then ice well, change water as needed.
Blackfin vs. Yellowfin - 2 Cool Fishing Forum
07 Sep 2006 · None identified greater than chance probability and most could tell no difference. Get a hot cast iron skillet place two tablespoons of sesame seed oil and two tablespoons of sesame seed then add a touch of fresh garlic then sear the tuna. Ideal to have the middle still raw so watch the time on the sear. Good Luck, David
Tuna out of Freeport Tx - 2 Cool Fishing Forum
31 Okt 2015 · Tuna out of Freeport Tx Jump to Latest 6.1K views 10 replies 7 participants last post by mlg567 Nov 1, 2015
Blackfin Tuna Question - 2 Cool Fishing Forum
18 Nov 2007 · Bluewater Board (Recreational Fishing) ...