#thunnus thynnus

[eddieintheocean]

i felt compelled to draw a tuna. and then i felt compelled to add the notes that i remembered from my lecture yesterday. i hope this is vaguely accurate thumbsup emoji (i already edited this once because god forbid i confuse the dorsal fin with the fucking pectoral fin)

[thoughtlessarse]

Flying fish … a huge bluefin tuna, about 7ft long, leaps out of the water while hunting garfish off the south coast of Devon, UK. The photographer, who happened to be kayaking nearby, reported that the tiny garfish were flipped tens of feet into the air as the tuna emerged - Photograph: Rupert Kirkwood/BNPS

click source for more Week in Wildlife photos

[ketoverkill]

Thunnus thynnus

[worldtunaday]

ICCAT estimates the annual catch of bluefin was between 50,000 and 60,000 tonnes.

A single Atlantic bluefin tuna (Thunnus thynnus) can weigh more than 500 kilograms and sell for more than $100,000 in Japanese markets. But the profitable market for the species has left it depleted to roughly 35% of its historic levels, according to ICCAT.

Bluefin tuna regulators under pressure - Nature

Investigation into fishing industry reveals a decade of violations.

[worldtunaday]

Promote sustainable fisheries management.

Overfishing has reduced numerous fish populations to remnants of their historical levels, yet we have a poor understanding of what impact this has had on their evolutionary potential and resilience. This information is crucial to predict future demographic changes and thus promote sustainable fisheries management. Studies of historical marine ecology offer an opportunity to learn and heed these past lessons. In particular, genetic/genomic studies can infer past history from contemporary samples, or directly test archaeological and archival samples for losses in genetic diversity, population restructuring, or adaptive responses to natural factors e.g., climate, or anthropogenic ones e.g., fisheries-induced evolution (FIE). A decade ago, the first to investigate temporal demographic changes in the key species Atlantic bluefin tuna (Thunnus thynnus, hereafter BFT) using archival early-20th century samples and microsatellite markers. Here, we build on this work by genotyping archival and archaeological samples to extend investigations into the pre-industrial era, when fishing may have also had the potential to impact BFT.

Ancient DNA SNP-panel data suggests stability in bluefin tuna genetic diversity despite centuries of fluctuating catches in the eastern Atla

Atlantic bluefin tuna (Thunnus thynnus; BFT) abundance was depleted in the late 20th and early 21st century due to overfishing. Histori

[worldtunaday]

Stock assessment models rely on a realistic description of species’ biology and ecology to yield unbiased estimates of stock status.

Atlantic bluefin tuna (Thunnus thynnus) are highly migratory fish with a contemporary range spanning the North Atlantic Ocean. Bluefin tuna populations have undergone severe decline and the status of the fish within each population remains uncertain. Improved biological knowledge, particularly of natural mortality and rates of mixing of the western (GOM) and eastern (Mediterranean) populations, is key to resolving the current status of the Atlantic bluefin tuna. We evaluated the potential for acoustic tags to yield empirical estimates of mortality and migration rates for long-lived, highly migratory species such as Atlantic bluefin tuna. Bluefin tuna tagged in the Gulf of St. Lawrence (GSL) foraging ground (2009–2016) exhibited high detection rates post release, with 91% crossing receiver lines one year post tagging, 61% detected after year two at large, with detections up to ~1700 days post deployment. Acoustic detections per individual fish ranged from 3 to 4759 receptions. A spatially-structured Bayesian mark recapture model was applied to the acoustic detection data for Atlantic bluefin tuna electronically tagged in the GSL to estimate the rate of instantaneous annual natural mortality. We report a median estimate of 0.10 yr−1 for this experiment. Our results demonstrate that acoustic tags can provide vital fisheries independent estimates for life history parameters critical for improving stock assessment models.

Estimating Natural Mortality of Atlantic Bluefin Tuna Using Acoustic Telemetry - Scientific Reports

Atlantic bluefin tuna (Thunnus thynnus) are highly migratory fish with a contemporary range spanning the North Atlantic Ocean. Bluefin tuna

[readok]

В Японии продали синего тунца за 1,8 млн долларов Атлантический синий тунец (Thunnus thynnus) весом 276 килограммов был выловлен в районе Аомори на севере Японии и продан на новогоднем аукционе в Токио 5 января.

[conservaquarium]

Bluefin tuna (Thunnus thynnus)

Note the “lunate” tail shape that gets its name from its resemblance to a crescent moon. That tail shape produces some of the fastest, most powerful swimmers on Earth. It’s perfect for roving predators like tuna that do a lot of cruising. These fish have burst speeds of 60 miles per hour and can travel long distances; many swim the breadth of the Atlantic Ocean multiple times in a single year!