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The «patuxo» (also popularly known in Galicia as patexo or pateiro) is a small swimming crab.

The unprecedented proliferation of patuxo devours mussel seed in Galician culture rafts

  (SPAIN, 6/29/2026)

The Galician Mussel Producers Organization (Opmega) warns of a massive plague of the swimming crab that directly attacks cultivation ropes and compromises the sector's future campaigns.

Vilagarcía de Arousa, Galician culture raft operators are enduring difficult seasons marked by prolonged red tides, extreme weather events, and historic production lows. However, this summer has brought an unprecedented threat for which the sector has no memory: a massive and unprecedented proliferation of the patuxo (also known popularly in Galicia as patexo or pateiro). This small swimming crab (Polybius henslowii), belonging to the Polybiidae family, has drastically modified its habitual behavior.

The 'patuxo' (Polybius henslowii) is a species of Brachyura decapod crustacean of the Portunidae family. The carapace of Polybius henslowii is almost circular, 48 millimetres (1.9 in) wide and 40 mm (1.6 in) long. The first pair of pereiopods (walking legs) carry claws, and the remaining four pairs are flattened with fringed edges.

Historically, the patuxo has been a common species on the marine sea beds of the Galician estuaries. Nevertheless, this season it has begun to ascend from the bottom toward the surface to massively invade culture raft ropes. Its objective is to voraciously devour the "mejilla", the local name given to the seed or young of the mussel (Mytilus galloprovincialis) in its initial growth stage, before it can reach commercial size.

The Galician Mussel Producers Organization (Opmega) has already urgently requested the Marine Research Center (CIMA) to open a specific study on this phenomenon. "We do not remember anything like it. The patuxo was always in our estuaries, but we had never seen it eat the mussel seed in this manner. The magnitude of the problem has led us to ask CIMA to investigate it urgently," explains Ricardo Herbón, president of Opmega. The objective of this request is to provide documentation, determine the exact causes of this unusual proliferation, and evaluate what viable measures can be applied to protect the cultivation structures.

Photo: OPMEGA

Keys to the crisis in the culture rafts

  • Fulminant destruction: Producers report that collector ropes, which were previously completely full of seed, are left totally clean and empty within a matter of a few days.

  • Most affected areas: The damage has been documented with special intensity and extreme aggressiveness in the Muros-Noia estuary, but worrying levels of impact are already recorded in the Arousa, Pontevedra, and Vigo estuaries.

  • Climate change as a primary factor: Both scientists and the sector point out that global warming and the increase in water temperature are drastically altering the behavior, feeding patterns, and reproduction cycles of these crustaceans.

  • Critical economic impact: Every rope that the patuxo empties represents production that will not reach port, placing the viability of harvest campaigns for the coming years in serious danger.

A sector at historic lows

This new plague arrives at an extremely delicate moment for Galician mussel aquaculture. The year 2025 ended as the worst financial year in decades for the sector: production dropped to 177,638 tons, representing a historic low and the third consecutive decline, remaining far from the nearly 300,000 tons recorded at the peak of the year 2006.

Throughout the current year, red tide episodes occurred consecutively with unusual severity and duration, eventually causing the simultaneous closure due to toxicity of all culture raft areas, an event without precedents in the history of this industry.

"We are concerned; the mussel sector cannot continue absorbing blow after blow," Herbón pointed out. Faced with this devastating scenario, Opmega will continue to share information regarding the evolution of the plague and will maintain open contact with both CIMA and the Consellería do Mar in order to coordinate joint solutions to mitigate the economic impact on the affected estuaries.


🇯🇵 Japanese Version (日本語版)

パトゥショの未曾有の大発生が養殖いかだのイガイの稚貝を貪り食う

ガリシア・イガイ生産者組合(Opmega)は、養殖ロープを直接襲い、同セクターの今後の操業を脅かすワタリガニ科の一種の大規模な疫病に警鐘を鳴らしている。

ヴィラガルシア・デ・アロウサ2026年6月26日。ガリシアの養殖いかだ業者は、長期化する赤潮、異常気象、そして過去最低の生産量に悩まされる困難なシーズンを重ねている。しかし、今年の夏は、このセクターの記憶にない前例のない脅威をもたらした。それは、パトゥショガリシアでは俗にパテショまたはパテイロとも呼ばれる)の大量かつ未曾有の大発生である。このワタリガニ科に属する小さな遊泳性のカニ(Polybius henslowii)は、その本来の行動パターンを劇的に変化させている。

歴史的に、パトゥショはガリシアのリアス(入り江)の海底に生息する一般的な種であった。しかし、今シーズン、このカニは海底から水面へと上昇し、養殖いかだのロープに大量に侵入し始めた。その目的は、商業サイズに達する前の、初期成長段階にあるムラサキイガイ(Mytilus galloprovincialis)の稚貝や種苗(現地名で「メヒハ」と呼ばれる)を猛烈な勢いで貪り食うことである。

ガリシア・イガイ生産者組合Opmega)は、すでに海洋研究センターCIMA)に対し、この現象に関する専門的な調査を開始するよう緊急に要請した。「このようなことは記憶にない。パトゥショは常に私たちの入り江にいたが、このようにイガイの稚貝を食べる姿は見たことがなかった。問題の重大性から、私たちはCIMAに緊急調査を依頼した」と、Opmegaの会長であるリカルド・エルボンは説明する。この要請の目的は、記録資料を提供し、この異常発生の正確な原因を突き止め、養殖構造物を保護するためにどのような実行可能な対策が適用できるかを評価することである。

養殖いかだにおける危機の鍵

  • 電撃的な破壊: 生産者からの告発によると、以前は稚貝で完全に満たされていたコレクター(採苗)ロープが、わずか数日のうちに完全に削ぎ落とされ、空になっている。

  • 最も深刻な影響を受けている地域: この被害は、ムロス・ノイアの入り江で特に激しく、極めて攻撃的な形で記録されているが、すでにアロウサポンテベドラヴィーゴの各入り江でも懸念すべき影響レベルが記録されている。

  • 主要な要因としての気候変動: 科学者もセクターも、地球温暖化と水温の上昇が、これら甲殻類の行動、摂食パターン、および繁殖サイクルを劇的に変化させていると指摘している。

  • 危機的な経済的影響: パトゥショが空にするロープの1本1本が、港に届かない生産量を意味しており、今後数年間の収穫操業の生存期間を深刻な危険にさらしている。

過去最低に落ち込むセクター

この新たな疫病は、ガリシアのイガイ養殖にとって極めてデリケートな時期に到来した。2025年は、同セクターにとってここ数十年で最悪の会計年度として終了した。生産量は177,638トンにまで落ち込み、過去最低を記録するとともに3年連続の減少となり、ピークであった2006年の約300,000トンから大幅に遠ざかる結果となった。

今年に入ってからも、赤潮の発生が異常な激しさと長さで相次ぎ、最終的にはすべての養殖いかだ区域が毒性のため同時に閉鎖されるという、この業界の歴史の中で前例のない事態を引き起こした。

「私たちは懸念している。イガイセクターは打撃に次ぐ打撃を吸収し続けることはできない」とエルボンは指摘した。この壊滅的なシナリオに直面し、Opmegaは疫病の推移に関する情報を伝え続け、影響を受けた入り江における経済的影響を緩和するための共同解決策を調整すべく、CIMAおよび海事部(Consellería do Mar)の両者と開かれた連絡体制を維持していく。


🇨🇳 Chinese Version (简体中文版)

“Patuxo”螃蟹史无前例的激增正在吞噬加利西亚养殖筏上的贻贝幼苗

加利西亚贻贝 section 生产商组织(Opmega)对这种游泳蟹的大规模灾害发出警告,该灾害直接攻击养殖绳索,并严重威胁到该行业的未来捕捞季。

维拉加西亚-德阿ロウサ,。加利西亚的养殖筏渔民们正经历着艰难的时期,其特点是长期的赤潮、极端天气事件以及历史性的产量低谷。然而,今年夏天带来了一场该行业记忆中从未见过的崭新威胁:patuxo(在加利西亚俗称为 patexo 或 pateiro)史无前例的大规模激增。这种属于Polybiidae科的小型游泳蟹(Polybius henslowii),已经急剧改变了其惯常的行为模式。

从历史上看,patuxo一直是加利西亚海湾(Rías)海底常见的一个物种。然而,在本捕捞季中,这种螃蟹开始从海底向水面上升,大规模入侵养殖筏的绳索。它们的目标是在紫贻贝(Mytilus galloprovincialis)的幼苗或种苗(当地称为“mejilla”)达到商业尺寸之前,处于生长初期阶段时,对其进行贪婪地吞噬。

加利西亚贻贝生产商组织Opmega)已经紧急要求海洋研究中心CIMA)对这一现象展开专门研究。“我们不记得有任何类似的事件。patuxo一直存在于我们的海湾中,但我们从未见过它以这种方式吃贻贝幼苗。问题的严重性促使我们请求CIMA进行紧急调查,”Opmega主席里卡多·埃尔邦Ricardo Herbón)解释道。该请求的目的在于提供文献资料,查明此次异常激增的确切原因,并评估可以采取哪些可行措施来保护养殖结构。

养殖筏危机的关键要素

  • 毁灭性的破坏: 生产商谴责称,此前完全挂满幼苗的采苗绳,在短短几天内就被彻底清理得空空如也。

  • 受影响最严重的区域: 这一灾情在穆罗斯-诺亚Muros-Noia)海湾被记录到的激烈程度和攻击性极高,但在阿ロウサArousa)、蓬特韦德拉Pontevedra)和维戈Vigo)等海湾也已经记录到了令人担忧的影响程度。

  • 气候变化为主要嫌疑因素: 科学家和该行业均指出,全球变暖和水温上升正在剧烈改变这些甲壳类动物的行为、觅食模式以及繁殖周期。

  • 临界经济影响:patuxo清空的每条绳索都代表着无法到港的产量,这使得未来几年的收获季的可行性处于严重危险之中。

处于历史低位的行业

这场新灾害的到来正值加利西亚贻贝养殖极其脆弱的时刻。2025年结束时成为了该行业数十年来最糟糕的财政年度:产量下滑至177,638吨,创下历史新低,且为连续第三年下降,远低于2006年巅峰时期的近300,000吨

在今年期间,赤潮事件以不同寻常的剧烈程度和持续时间接连发生,最终导致所有养殖区因毒性同时关闭,这在该行业的历史上是毫无先例的。

“我们很担忧,贻贝行业无法继续承受接二连三的打击,”埃尔邦对此指出。面对这一毁灭性的局面,Opmega将继续传达有关该灾情演变的信息,并保持与CIMA海洋部Consellería do Mar)的公开沟通,以寻求联合解决方案,减轻受影响海湾的经济冲击。

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Address: Avenida da Marina, 25 , Edif. Mexillon de Galicia
City: Villagarcia De Arosa
State/ZIP: Pontevedra, Galicia (36600)
Country: Spain
Phone: +34 986 501 338
Fax: +34 986 501 389
E-Mail: [email protected]
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