Yellowfin are a mid-sized tuna species and are distinguished, as their name suggests by their yellow fins. They are bigger than Albacore and skipjack but smaller than the famed bluefin. They are a highly migratory fish that roams all the world’s oceans in tropical and subtropical zones.
Yellowfin have a metallic, dark blue back and yellow to silver belly. Their dorsal and anal fins and finlets are bright yellow and they have streamlined, torpedo-shaped bodies adapted to fast and continuous swimming. Yellowfin has a mild, meaty flavour and bright red meat that turns brown to grayish-tan when cooked. Yellowfin is often served raw as sashimi and in sushi.
Yellowfin grow quick with a life span of only six to seven years. They begin to reproduce when they reach the age of two. The species is very productive, spawning throughout the year in tropical waters and seasonally at higher latitudes. Females can spawn almost daily, releasing millions of eggs each time. Their most productive spawning periods are in the spring and fall. Females release their eggs near the sea surface where they are fertilized. Juvenile yellowfin stay close to the surface, but move into deeper water as they mature. They are also known to gather around drifting flotsam (natural floating debris), anchored buoys, whales and other large marine mammals. They are at the top of the food chain and feed on other fish, squid and crustaceans.
Handlining is a small-scale fishing method in which fish harvesters jig for tuna with weighted hooks, troll at low speeds with lures, attach hooks and lines to makeshift floats, and even use kites to dangle lures along the sea surface to attract tuna.
This fishery uses a longline to catch a variety of pelagic fish on the high seas such as tuna and swordfish. A deep-set longline is used to primarily target tuna and a shallow-set longline is used to target swordfish or mixed species including bigeye, Albacore and yellowfin tuna. Baited hooks are attached to a line that floats in the ocean using buoys and flagpoles.
This fishery uses a variety of artisanal hook-and-line methods to catch coastal pelagic fish such as tuna, marlin, swordfish, mahi mahi, wahoo (ono) and others. A pole and line with live bait scattered into the water is used to catch feeding skipjack tuna. Trolling with lures and lines, and handlines with lures, lines and bait bags are used to target larger fish such as bigeye tuna, swordfish, mahi mahi and wahoo.
This small-scale fishing method uses a pole and line to catch a variety of tuna species. Live baitfish is scattered into the sea to attract tuna. Fish harvesters then use a pole, lure and barbless hook to catch the feeding tuna.
Mangrove Crab HarvesterCanavieiras, Brazil
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