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The study ultimately reshapes scientific understanding of Atlantic bluefin tuna

A Hidden Ocean Nursery: Decades of Data Reveal Bluefin Tuna Spawn Across Vast Atlantic Corridor

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Monday, March 16, 2026, 02:40 (GMT + 9)

Seven decades of scientific records show Atlantic bluefin tuna reproduce across a nearly continuous region stretching from the Northwest Caribbean to the waters off the northeastern United States

A groundbreaking scientific analysis spanning more than 70 years of ocean research has uncovered a far broader spawning range for Atlantic bluefin tuna than scientists previously believed. The study reveals that the prized species may reproduce across a nearly continuous stretch of ocean from the Northwest Caribbean to the Slope Sea off the northeastern United States, challenging long-held assumptions about its breeding grounds.

The findings, published in Progress in Oceanography, are based on an extensive review of historical and modern data by researchers from NOAA Fisheries and partner institutions. By examining thousands of samples and historical records dating back to the 1950s, scientists pieced together one of the most comprehensive pictures ever assembled of bluefin tuna reproduction in the western North Atlantic.

A map of the proposed spawning patterns of Atlantic bluefin tuna in the western Atlantic Ocean. The sampling effort by region directed at adult and larval bluefin tuna is also noted. Credit: Progress in Oceanography /NOAA FIshery

A Massive Data Investigation Spanning Generations

To uncover long-term patterns, researchers analyzed more than 35,000 plankton tows and examined nearly 5,000 individual bluefin tuna larvae collected during surveys, research cruises, and archived museum samples.

Their investigation revealed that bluefin tuna spawn in several regions beyond the historically recognized spawning ground in the Gulf of America, including:

  • Northwest Caribbean Sea

  • Waters north of the Bahamas

  • Blake Plateau

  • Off the Carolina coast, shoreward of the Florida Current

  • The western Slope Sea, located between the U.S. continental shelf and the Gulf Stream

Credit: Progress in Oceanography /NOAA FIshery

Among these regions, the northern Gulf of America during late spring and the western Slope Sea in early summer produce the highest numbers of larvae.

The research suggests that spawning occurs along a continuous corridor across the western Atlantic, with the season beginning in April in southern waters and extending until early August in the northernmost areas.

Research fish biologist Dave Richardson, the study’s lead author, explained:

“Previous larval studies outside the Gulf of America were often based on a single year of sampling. When we compiled data from many surveys, the consistency was remarkable. When you sample the same area at the same time of year, you consistently find bluefin larvae. This confirmed the pattern we’ve seen in recent years has been going on for a long time. For example, bluefin larvae have been collected from the 1970s through the 2000s in both the Yucatan Channel in the south and the Slope Sea in the north.”

Solving the Mystery of Where Bluefin Tuna Reproduce

For decades, scientists believed Atlantic bluefin tuna spawned mainly in just two regions: the Mediterranean Sea and the Gulf of America. These locations defined the two major stocks used in international fisheries management.

However, recent discoveries — including evidence of spawning in the Slope Sea — suggested the picture might be more complex. Researchers launched the new study to determine whether other overlooked breeding grounds existed.

Because bluefin tuna are highly migratory and spend much of their lives in the open ocean, documenting their spawning activity is extremely difficult. The most reliable methods include:

  • Capturing adult tuna in reproductive condition

  • Collecting larval fish, typically less than 10 days old, in plankton samples

These approaches require scientists to be in the right place at the right time, often hundreds of miles offshore.

Examples of Atlantic bluefin tuna larvae identified under a microscope and with a micro-CT scan of a larva (H and I). These bluefin larvae were collected from the 1970s through 2010s and are archived in numerous museums and collections. Credit: NOAA Fisheries/Katey Marancik and Andrew Williston/Harvard Museum of Comparative Zoology (CT Scan)/NOAA

To complement direct sampling, researchers also used habitat models, satellite tagging data, and sea surface temperature records to predict where spawning might occur. Bluefin tuna typically spawn in waters between 73°F and 82°F (23–28°C).

Hidden Clues in Museum Archives

One of the most remarkable aspects of the study involved revisiting archived plankton samples collected over decades.

Scientists discovered that many bluefin larvae had gone unrecognized in earlier collections because identification guides once suggested that the species spawned only in the Gulf of America.

Research fishery biologist Katey Marancik, a co-author, explained:

“Larval fish look nothing like their adult selves. Fins, pigment, even mouth and eyes develop over the first few days or weeks after hatching. We need to rule everything else out to confidently identify the species. This takes skill and experience. It comes down to minute details under a microscope, like specific and unique pigment patterns, that change as the larva develops. We did this several thousand times.”

The team examined specimens preserved by institutions such as the Harvard Museum of Comparative Zoology, the Smithsonian Museum of Natural History, the Virginia Institute of Marine Science, and several university collections, along with archives maintained by NOAA Fisheries science centers.

Jon Hare, director of the Northeast Fisheries Science Center, emphasized the importance of these historical resources:

“When we think of fisheries, we think of the adult fish that we catch and enjoy as seafood. This study shows the value of ichthyoplankton data—data on fish in their egg and larval stages. It also demonstrates how archives and museums allow researchers to go back and reexamine samples and data from the past. It is exciting to see this careful and thorough analysis change what we know about one of the ocean's most iconic species.”

Why Spawning Grounds Matter for Fisheries Management

Understanding where bluefin tuna spawn is critical for managing one of the world’s most valuable fish species. The fish is highly prized by both commercial fisheries and recreational anglers, particularly for the global sushi and sashimi markets.

Ichthyoplankton samples at the NOAA Fisheries Narragansett Laboratory’s plankton archive. Credit: NOAA Fisheries/Katey Marancik

The species experienced significant population declines from the 1970s through the early 2000s, though conservation measures and international quotas have contributed to recent signs of recovery.

Better mapping of spawning areas could help scientists determine whether distinct groups of bluefin tuna interbreed mainly within specific regions, which would affect how fisheries are regulated.

According to Trika Gerard, deputy director of the Southeast Fisheries Science Center and co-author of the study:

“These new data tell us where bluefin tuna are spawning and when, which gives us an idea of where they are migrating and how much they are contributing to future generations. This, combined with information about genetics and population structure, helps managers decide the most appropriate way to sustainably fish for this prized species.”

Climate Change Shifting the Timing of Spawning

The research also examined 42 years of sea surface temperature records, revealing that warming oceans are influencing the timing of spawning conditions.

Between 1982 and 2023, waters across many spawning regions reached optimal temperatures earlier in the year, particularly in the Slope Sea, which is warming faster than other areas.

Despite these temperature shifts, scientists found little evidence that bluefin tuna have changed the geographic locations of their spawning grounds.

Co-author Christina Hernandez, an assistant professor at Old Dominion University, noted:

“Our findings re-affirm that bluefin tuna spawning is related to biology and habitat qualities, rather than arbitrary geographic boundaries. Like most tuna species, they spawn when their internal cues for spawning, including their gonads and energetic stores, match up with external habitat cues, including water temperature. Because of this, they may be more resilient to environmental change than if they only spawned in one area, for example, the Gulf.”

An Unanswered Question in the Sargasso Sea

Despite the study’s unprecedented scope, researchers believe additional spawning areas may still remain undiscovered.

One region of particular interest is the northwest Sargasso Sea, located south of the Gulf Stream and east of the Florida Current. Adult bluefin tuna are known to pass through the area during June, when temperatures are suitable for reproduction, but no larval surveys have yet been conducted there.

Left) A deck scene during longline hauling operations and (right) a catch of large bluefin tuna from the Windward Passage, from the October 1955 edition of the Commercial Fisheries Review (Vol.17, No.10). Credit: Commercial Fisheries Review

Lead author Dave Richardson said researchers hope future surveys will fill this gap:

“We are keeping our eyes open for opportunities to sample in June in the northwest Sargasso Sea, a few hundred miles east of the Carolinas. The plankton tows we use to collect bluefin larvae are quick, typically taking only 10–15 minutes. The challenge and expense is getting to these areas of the open ocean. ‘Piggybacking’ on existing research surveys can be a cost effective way to sample and ultimately answer longstanding questions about bluefin population structure.”

The study ultimately reshapes scientific understanding of Atlantic bluefin tuna, revealing that the species’ reproductive habitat spans far more of the western Atlantic than previously recognized — a discovery that could influence fisheries science and conservation efforts for years to come.


🇯🇵 日本語 (Japanese)

隠された海の保育場:数十年にわたるデータが明らかにしたクロマグロの広大な大西洋産卵回廊

70年以上にわたる科学記録により、大西洋クロマグロが北西カリブ海から米国北東沖の海域までほぼ連続した地域で繁殖していることが判明

大西洋クロマグロの産卵範囲が、これまで科学者が考えていたよりもはるかに広いことが、70年以上に及ぶ海洋研究を分析した画期的な研究によって明らかになりました。この研究によると、この貴重な魚種は北西カリブ海から米国北東沖のスロープ海まで広がるほぼ連続した海域で繁殖している可能性があり、長年の繁殖地に関する仮説に挑戦しています。

この研究結果はProgress in Oceanography誌に掲載され、NOAA Fisheriesと提携機関の研究者たちによる広範な歴史データと最新データの分析に基づいています。研究者たちは1950年代までさかのぼる何千ものサンプルと歴史的記録を調査し、西部北大西洋におけるクロマグロ繁殖のこれまでで最も包括的な姿の一つを明らかにしました。

世代を超えた大規模データ調査

長期的なパターンを明らかにするため、研究者たちは35,000回以上のプランクトン採集を分析し、約5,000匹のクロマグロ仔魚を調査しました。これらのサンプルは、調査航海、研究クルーズ、博物館の保存標本などから集められたものです。

調査の結果、クロマグロは歴史的に知られていたガルフ・オブ・アメリカの産卵場以外にも、以下の地域で産卵していることが判明しました。

  • 北西カリブ海

  • バハマ北方海域

  • ブレイク・プラトー

  • フロリダ海流沿い、カロライナ沖の海域

  • 西部スロープ海米国大陸棚ガルフストリームの間に位置)

これらの地域の中でも、晩春のガルフ・オブ・アメリカ北部初夏の西部スロープ海が最も多くの仔魚を生み出しています。

研究は、産卵が西部大西洋に沿った連続した回廊で行われている可能性を示しています。産卵期は南部海域である北西カリブ海ガルフ・オブ・アメリカ南部4月に始まり、最北の産卵地であるスロープ海8月初旬まで続きます。

研究の筆頭著者である研究魚類生物学者Dave Richardsonは次のように説明しています。

「ガルフ・オブ・アメリカ以外で行われたこれまでの仔魚研究は、多くの場合、1年分のサンプリングだけに基づいていました。私たちが多くの調査データをまとめたところ、その一貫性は驚くべきものでした。同じ海域を同じ季節に調査すると、常にクロマグロの仔魚が見つかるのです。これは、近年観察されてきたパターンが長い間続いてきたことを確認するものです。例えば、1970年代から2000年代にかけて、南のユカタン海峡と北のスロープ海の両方でクロマグロの仔魚が採集されています。」

クロマグロがどこで繁殖するのかという謎を解く

数十年にわたり、科学者たちは大西洋クロマグロが主に地中海ガルフ・オブ・アメリカの2地域で産卵すると考えてきました。これらの地域は、国際的な漁業管理で使用される2つの主要資源群を定義していました。

しかし近年、スロープ海での産卵の証拠などの発見により、状況がより複雑である可能性が示されました。研究者たちは、見落とされていた繁殖地が他にも存在するかどうかを調べるため、この研究を開始しました。

クロマグロは高度回遊性魚類であり、生涯の大部分を外洋で過ごすため、産卵活動の記録は非常に困難です。最も信頼性の高い方法は次の通りです。

  • 成熟した成魚を捕獲する

  • 10日未満の仔魚をプランクトンサンプルから採集する

これらの方法は、科学者が適切な場所と時期にいることを必要とし、多くの場合数百マイル沖合での調査となります。

研究者たちはまた、生息地モデル電子タグデータ海面水温記録を使用して産卵の可能性がある場所を予測しました。クロマグロは通常**73°F~82°F(23~28°C)**の水温で産卵します。

博物館のアーカイブに隠された手がかり

この研究の最も注目すべき点の一つは、数十年前に収集されたプランクトンサンプルを再調査したことでした。

科学者たちは、多くのクロマグロ仔魚が過去のコレクションの中で見過ごされていたことを発見しました。その理由は、かつての識別ガイドがクロマグロの仔魚はガルフ・オブ・アメリカでのみ見られると示していたためです。

共同著者の研究魚類生物学者Katey Marancikは次のように説明しました。

「仔魚の魚は成魚とはまったく似ていません。孵化後の最初の数日から数週間の間に、ヒレ、色素、さらには口や目まで発達していきます。種を確実に特定するためには、他のすべての可能性を排除する必要があります。これには技術と経験が必要です。顕微鏡の下で観察される、発達とともに変化する特有の色素パターンのような非常に細かい特徴に基づいて判断します。私たちはこれを何千回も繰り返しました。」

研究チームは、Harvard Museum of Comparative ZoologySmithsonian Museum of Natural HistoryVirginia Institute of Marine Science、その他複数の大学コレクション、さらにNOAA Fisheries科学センターのアーカイブに保存された標本を調査しました。

Northeast Fisheries Science CenterのディレクターであるJon Hareは次のように述べています。

「漁業というと、私たちは通常、捕獲して食用として楽しむ成魚を思い浮かべます。この研究は、魚の卵や仔魚の段階に関するデータであるイクチオプランクトンデータの価値を示しています。また、アーカイブや博物館が研究者に過去のサンプルやデータを再検証する機会を与えることも示しています。このような慎重で徹底した分析が、海で最も象徴的な生物の一つについての理解を変えるのを見るのは非常に刺激的です。」


🇨🇳 简体中文 (Simplified Chinese)

隐藏的海洋育婴场:数十年数据揭示蓝鳍金枪鱼横跨大西洋的广阔产卵走廊

超过70年的科学记录显示,大西洋蓝鳍金枪鱼可能在从西北加勒比海到美国东北部外海的几乎连续区域繁殖

一项基于70多年海洋研究数据的突破性研究显示,大西洋蓝鳍金枪鱼的产卵范围远比科学家此前认为的更广。研究表明,这种珍贵鱼类可能在从西北加勒比海一直延伸到美国东北部外海的坡海(Slope Sea)之间形成几乎连续的产卵区域,挑战了长期以来关于其繁殖地点的传统认识。

该研究成果发表在Progress in Oceanography期刊上,由NOAA Fisheries及其合作机构的科学家通过分析大量历史与现代数据完成。研究人员审查了可追溯到20世纪50年代的数千份样本与历史记录,构建了西北大西洋蓝鳍金枪鱼繁殖活动迄今最全面的研究图景之一。

跨越数代人的大规模数据调查

为了揭示长期趋势,研究人员分析了超过35,000次浮游生物拖网采样,并检查了近5,000尾蓝鳍金枪鱼仔鱼。这些样本来自渔业调查、研究航次以及博物馆保存的档案标本。

研究结果显示,除了传统认为的**美洲湾(Gulf of America)**产卵地外,蓝鳍金枪鱼还会在以下区域产卵:

  • 西北加勒比海

  • 巴哈马以北海域

  • 布莱克高原(Blake Plateau)

  • 佛罗里达洋流内侧、卡罗来纳沿岸海域

  • 西部坡海(位于美国大陆架边缘墨西哥湾流之间)

在这些区域中,晚春的美洲湾北部以及初夏的西部坡海产生的仔鱼数量最多。

研究表明,蓝鳍金枪鱼可能沿着西北大西洋形成一条连续的产卵走廊。产卵季节从最南端区域——西北加勒比海美洲湾南部4月开始,一直持续到最北端产卵地坡海8月初

研究首席作者、渔业生物学家Dave Richardson解释说:

“过去在美洲湾之外进行的仔鱼研究往往只基于单一年度的采样。当我们汇总来自多次调查的数据时,其一致性令人惊讶。当你在同一海域、同一季节进行采样时,总能发现蓝鳍金枪鱼仔鱼。这证实了我们近年来观察到的模式其实已经持续了很长时间。例如,从1970年代到2000年代,在南部的尤卡坦海峡以及北部的坡海都曾采集到蓝鳍金枪鱼仔鱼。”

解开蓝鳍金枪鱼在哪里繁殖的谜团

几十年来,科学家一直认为大西洋蓝鳍金枪鱼主要在两个地方产卵:地中海美洲湾。这两个区域也定义了国际渔业管理中使用的两大资源种群。

然而近年来,包括坡海发现产卵证据在内的研究表明,情况可能更加复杂。因此,科学家开展了这项研究,以寻找是否存在其他被忽视的产卵地点。

由于蓝鳍金枪鱼是高度洄游性鱼类,一生大部分时间生活在公海,记录其产卵活动极具挑战性。最可靠的方法包括:

  • 捕获处于繁殖状态的成鱼

  • 在浮游生物拖网中采集通常不足10天龄的仔鱼

这些方法要求科学家在正确的地点和正确的季节进行采样,而这些地点往往距离海岸数百英里

研究人员还利用栖息地模型电子标记成鱼的地理数据以及海表温度记录预测潜在的产卵区域。此前研究表明,蓝鳍金枪鱼通常在**73°F–82°F(23–28°C)**的水温下产卵。

博物馆档案中的隐藏线索

本研究最引人注目的部分之一是重新分析了几十年前采集的浮游生物样本

科学家发现,许多蓝鳍金枪鱼仔鱼实际上一直隐藏在这些历史样本中,只是当时没有被识别出来,因为早期的鉴定指南认为蓝鳍仔鱼只会出现在美洲湾

共同作者、渔业生物学家Katey Marancik解释说:

“仔鱼与成年鱼看起来完全不同。在孵化后的最初几天或几周里,鳍、色素,甚至嘴和眼睛都会逐渐发育。为了有把握地确定物种,我们必须排除其他所有可能性。这需要技巧和经验。关键在于显微镜下非常细微的特征,比如随着仔鱼发育而变化的独特色素图案。我们重复进行了数千次这样的鉴定。”

研究团队检查了来自Harvard Museum of Comparative ZoologySmithsonian Museum of Natural HistoryVirginia Institute of Marine Science以及多个大学收藏机构和NOAA Fisheries科学中心档案的标本。

Northeast Fisheries Science Center主任Jon Hare表示:

“当我们谈到渔业时,通常想到的是我们捕捞并作为海鲜享用的成年鱼类。这项研究展示了鱼类卵和仔鱼阶段数据——即鱼类浮游生物数据——的重要价值。它还说明了档案馆和博物馆如何使研究人员能够回到过去,重新审视旧样本和数据。看到如此细致而全面的分析改变我们对海洋中最具标志性物种之一的认识,令人非常兴奋。”

了解产卵地点是渔业管理的关键

弄清蓝鳍金枪鱼何时何地产卵,对于管理这种世界上最有价值的鱼类之一至关重要。

该物种受到商业渔业休闲渔业的高度重视,尤其在全球寿司和刺身市场中需求极高。

蓝鳍金枪鱼种群在1970年代到2000年代初期曾严重下降,但在国际配额和保护措施实施后,近年来种群趋势有所改善

Southeast Fisheries Science Center副主任、论文共同作者Trika Gerard总结道:

“这些新数据告诉我们蓝鳍金枪鱼在何处、何时产卵,这让我们更好地理解它们的迁徙路线以及它们对未来世代的贡献。将这些信息与遗传学和种群结构研究结合起来,可以帮助管理者决定如何以最可持续的方式捕捞这一珍贵物种。”

气候变化正在改变理想产卵条件的时间

研究还分析了42年的海表温度数据,以寻找蓝鳍金枪鱼产卵适宜区域和时间是否发生变化。

1982年至2023年期间,由于海洋变暖,许多产卵区域达到理想温度的时间比过去更早。其中,坡海的变暖速度尤为明显。

然而,研究几乎没有发现蓝鳍金枪鱼改变产卵地点的证据。

Old Dominion University生物科学助理教授、共同作者Christina Hernandez表示:

“我们的研究结果再次证明,蓝鳍金枪鱼的产卵与生物学特性和栖息地条件有关,而不是人为划定的地理边界。像大多数金枪鱼一样,它们会在内部繁殖信号(例如性腺成熟和能量储备)与外部环境条件(例如水温)相匹配时产卵。正因为如此,与只在一个区域产卵的物种相比,它们可能对环境变化更具韧性。”

马尾藻海仍然存在未解之谜

虽然这项研究扩大了已知的蓝鳍金枪鱼产卵范围,但也表明长期以来的采样并不均衡,仍可能存在尚未发现的产卵地。

科学家尤其希望在西北马尾藻海进行采样,该区域位于墨西哥湾流以南、佛罗里达洋流以东

首席作者Dave Richardson表示:

“我们正在寻找机会在6月前往西北马尾藻海采样,该区域位于卡罗来纳州以东数百英里处。我们用来采集蓝鳍金枪鱼仔鱼的浮游生物拖网通常只需要10到15分钟。真正的挑战和成本在于到达这些远离海岸的开放海域。搭载现有研究航次‘顺便’进行采样,是一种具有成本效益的方式,可以最终回答关于蓝鳍金枪鱼种群结构的长期问题。”

这项研究最终重新塑造了人们对大西洋蓝鳍金枪鱼的科学认知,表明该物种的繁殖栖息地横跨的西大西洋范围远比此前认识的更广——这一发现可能在未来多年影响渔业科学与保护工作。

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