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The presence of subtropical species near California is increasing due to the warming of the eastern Pacific, with significant catches being recorded.

Closer Does Not Mean More Abundant: Tuna Shifts Its Map in the Pacific

WORLDWIDE
Friday, July 17, 2026, 06:00 (GMT + 9)

The warming of the Pacific is modifying the distribution of several tuna species in the Eastern Pacific, temporarily bringing them closer to the California coast. For the industry, this signal does not yet point to an increase in biomass or global supply, but rather to a redistribution of the resource that could alter catching costs and competitiveness between fleets.

The first effects of the current El Niño episode are beginning to be felt in one of the world's most valuable fisheries. Recent reports and observations from commercial and recreational fishers indicate an unusually nearshore presence of species such as yellowfin tuna (Thunnus albacares) and Pacific bluefin tuna (Thunnus orientalis) in southern California waters, favored by sea surface temperatures that are above average. Although the phenomenon has raised expectations of better catches, specialists insist that greater access to the resource does not necessarily imply greater abundance.

Source: NOAA

The Ocean Changes… and Tuna Responds

El Niño modifies temperature, currents, and food availability across vast areas of the Pacific. As a consequence, many highly migratory species adjust their routes to follow more favorable environmental conditions.

In the case of tuna, this displacement can translate into a greater presence in areas where they are usually less frequent, allowing certain fleets to access the resource with shorter journeys and reduced search times.

However, this movement should not be interpreted as an automatic increase in the stock. The resource may be redistributing geographically without any change in its total biomass.

This distinction is key to avoiding an erroneous interpretation of the market.

Click on the image to enlarge it

Winners and Losers of the Same Redistribution

From an operational point of view, the proximity of the resource can represent an immediate advantage for some fleets.

If tuna remains closer to the coast, vessels could reduce fuel consumption, navigation time, and costs associated with each fishing trip. Greater operational efficiency can translate into better margins, even if the total volume caught does not increase.

But the same phenomenon can have the opposite effect in other regions.

Traditionally productive areas could record lower temporary availability, forcing certain fleets to modify their fishing grounds or increase their effort to maintain similar catch levels.

In other words, El Niño does not necessarily create more fish; it changes who has access to it.

 

Photo: NOAA

The Market Still Awaits Confirmation

For now, the observed redistribution is not yet conclusively reflected in economic indicators.

There is insufficient evidence of a sustained increase in commercial landings, an expansion of global supply, or structural changes in international tuna prices attributable to this phenomenon.

The coming months will be decisive in verifying whether the observations made at sea end up becoming a commercial trend.

To this end, it will be necessary to monitor the evolution of landings, catch per unit of effort (CPUE), distances traveled by the fleet, first-sale prices, and scientific data on the distribution of the main species.

Until then, the current situation should be interpreted as an early signal of spatial reorganization of the resource, not as a consolidated market change.

 

Photo: Stockfile/FIS

Why It Matters

The redistribution of tuna can modify competitiveness between fleets without increasing the available biomass. A closer resource reduces operational costs for some operators, while others may lose access to traditionally profitable areas. For processors, marketers, and international buyers, the key will be to determine whether this shift ultimately translates into higher landings and raw material availability or if it is merely a temporary displacement associated with oceanographic conditions.

Indicators to Watch

  • Evolution of commercial landings in California and the Eastern Pacific.

  • NOAA and IATTC reports on tuna distribution.

  • Catch per unit of effort (CPUE) data from commercial fleets.

  • Evolution of sea surface temperatures during the second semester.

  • Trend of first-sale prices and tuna exports.


🇯🇵 日本語 (Japanese Version)

距離の近さは豊度の高さにあらず:太平洋におけるマグロの分布図変化

太平洋の海水温上昇に伴い、東部太平洋における複数のマグロ類の分布が変化しており、一時的にカリフォルニア沿岸へ接近する動きが見られます。業界にとってこの兆候は、現時点では資源量や世界的な供給量の増加を示すものではなく、漁獲コストや漁船勢力間の競争力に影響を及ぼし得る資源の再分布を意味しています。

現在発生しているエルニーニョ現象の初期影響が、世界で最も価値のある漁業の一つで現れ始めています。最近の報告や商業・遊漁船の観察によると、平年を上回る海面水温の影響により、南カリフォルニア沖でキハダマグロ(Thunnus albacares)や太平洋クロマグロ(Thunnus orientalis)といった種が、異例の近海寄りに存在していることが確認されています。この現象により漁獲向上への期待が高まっていますが、専門家は資源へのアクセスが容易になったからといって、必ずしも資源自体の豊度が高まったわけではないと指摘しています。

変化する海…それに適応するマグロ

エルニーニョは太平洋の広範な海域において、水温、海流、餌の分布に変化をもたらします。その結果、高度回遊性魚類の多くは、より好条件の環境を求めて移動ルートを調整します。

マグロの場合、この移動によって普段は出現頻度が低い海域での存在感が増し、特定の漁船団にとっては航行距離や探索時間を短縮して資源にアクセスできるメリットが生じます。

しかし、この動きを単純に資源量の自動的な増加と捉えるべきではありません。資源の全体的なバイオマスは変動しないまま、地理的な再分布が起きているに過ぎない可能性があるからです。

この差異を認識することが、市場動向を誤認しないための極めて重要なポイントとなります。

同一の再分布が生む「勝者」と「敗者」

操業の観点から見ると、資源が近海に位置することは、一部の漁船団にとって即時的な利点となります。

マグロが沿岸に近い状態が維持されれば、漁船は燃料消費量、航行時間、および各航海に伴うコストを削減できます。操業効率の向上は、たとえ全体の漁獲量が増加しなくても、利益率の改善に直結します。

一方で、同様の現象が他の地域では逆の効果をもたらす場合があります。

従来、高い生産性を誇っていた海域で一時的に資源の入手可能性が低下し、特定の漁船団は同様の漁獲水準を維持するために操業海域の変更や漁獲努力量の増大を余儀なくされる可能性があります。

換言すれば、エルニーニョは必ずしも魚の総量を増やすわけではなく、誰がその資源にアクセスできるかを変化させているのです。

市場は未だ確定的な兆候を待つ状況

現時点では、観察されている再分布の動きが経済指標に決定的な影響を与えるまでには至っていません。

本現象に起因する商業水揚げの持続的な増加、世界供給の拡大、あるいは国際マグロ価格の構造的な変化を示す十分な証拠はまだ確認されていません。

海洋での観察結果が最終的に商業的なトレンドとして定着するかどうかは、今後の数ヶ月間が極めて重要な判断時期となります。

そのためには、水揚げ量の推移、単位努力量当たり漁獲量(CPUE)、漁船団の航行距離、一次販売価格、そして主要種の分布に関する科学的データを注視していく必要があります。

それまでは、現在の状況を市場の確固たる変化としてではなく、資源の空間的な再配置を示す初期のシグナルとして捉えるのが賢明です。

なぜ重要なのか?

マグロの再分布は、利用可能な資源量が拡大せずとも、漁船勢力間の競争力を変化させる可能性があります。資源の近海化は一部の操業者の運航コストを低減させる一方で、他の操業者は従来収益性の高かった海域へのアクセスを失うリスクを負います。加工業者、流通業者、および国際バイヤーにとっての焦点は、この変化が最終的に水揚げ量の増加や原料供給の安定化に結びつくのか、それとも海洋環境の一時的な変動に伴う一過性の移動に過ぎないのかを見極めることにあります。

注視すべき主要指標

  • カリフォルニアおよび東部太平洋における商業水揚げ量の推移。

  • NOAA(米国海洋大気庁)およびIATTC(全米熱帯マグロ類委員会)によるマグロ類分布報告。

  • 商業漁船団の単位努力量当たり漁獲量(CPUE)データ。

  • 下半期における海面水温の推移。

  • 一次販売価格およびマグロ輸出動向。


🇨🇳 简体中文 (Simplified Chinese Version)

距离更近并不意味着数量更丰:太平洋金枪鱼正在改变分布版图

太平洋变暖正在改变东太平洋几种金枪鱼的分布,使其暂时向加利福尼亚海岸靠拢。对于产业界而言,这一信号目前并不意味着生物量或全球供应量的增加,而是资源的重新分布,这可能会改变捕捞成本以及不同船队之间的竞争力。

当前厄尔尼诺事件的首波影响已开始在这个全球最具价值的渔业之一中显现。近期报告以及商业和娱乐渔民的观察表明,受高于平均水平的海面温度影响,黄鳍金枪鱼(Thunnus albacares)和太平洋蓝鳍金枪鱼(Thunnus orientalis)等物种在南加利福尼亚海域表现出异常靠近海岸的特征。尽管这一现象引发了捕捞量增加的期待,但专家强调,获取资源的便利性提高并不一定意味着资源总量的增加。

海洋在变…金枪鱼在变

厄尔尼诺现象改变了太平洋广大区域的水温、洋流以及食物丰度。因此,许多高度洄游性物种调整了它们的路线,以追随更适宜的环境条件。

就金枪鱼而言,这种转移可能表现为在通常较少出现的区域增加存在感,从而使特定船队能够以更短的航程和更少的寻找时间获取资源。

然而,这种移动不应被解读为存栏量的自动增长。资源可能只是在地理上进行了重新分布,而其总生物量并未发生改变。

这种区别是避免对市场产生误判的关键。

同一重新分布下的赢家与输家

从操业角度来看,资源的临近可为部分船队带来直接的竞争优势。

如果金枪鱼持续靠近海岸,渔船可以减少燃料消耗、航行时间以及每趟出海的相关成本。即使总捕捞量没有增加,操业效率的提升也能转化为更高的利润空间。

但同样这一现象在其他地区可能会产生相反的影响。

传统的丰产区域可能会出现暂时性的资源可用性下降,迫使特定船队调整其捕捞区域或增加捕捞努力量,以维持原有的捕捞水平。

换句话说,厄尔尼诺并不一定会创造更多的鱼类,它只是改变了谁能获取这些资源。

市场仍在静待确认

目前,观察到的重新分布尚未在经济指标中得到决定性的体现。

尚无充足证据表明商业卸鱼量持续增长、全球供应出现扩张,或国际金枪鱼价格因这一现象发生结构性改变。

接下来的几个月将是验证海上观察结果是否会转化为商业趋势的关键期。

为此,必须持续跟踪卸鱼量的变化、单位努力量捕捞量(CPUE)、船队航行距离、首次交易价格以及关于主要物种分布的科学数据。

在此之前,建议将当前状况视为资源空间重组的早期信号,而非市场格局的实质性改变。

为什么重要?

金枪鱼的重新分布可能在不增加可用生物量的情况下改变船队之间的竞争力。资源向近海移动降低了部分运营商的操业成本,而其他运营商则可能失去对传统高收益区域的访问权。对于加工商、贸易商和国际买家而言,关键在于确定这种变化最终是否会反映在卸鱼量的增加和原料供应的改善上,还是仅为与海洋学条件相关的暂时性位移。

需密切监测的指标

  • 加利福尼亚及东太平洋商业卸鱼量的变化。

  • NOAAIATTC 关于金枪鱼分布的报告。

  • 商业船队的单位努力量捕捞量(CPUE)数据。

  • 下半年海面温度的变化趋势。

  • 首次交易价格及金枪鱼出口走势。

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