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Pejerrey bonaerense: el pez emblemático de la Pampa y su camino hacia una acuicultura sustentable

El pejerrey bonaerense es un pez nativo de la región pampeana de Sudamérica, muy valorado tanto por su sabor como por ser protagonista de la pesca deportiva en Argentina, Uruguay y Brasil.
Se distingue por su cuerpo alargado y su carne blanquísima. Es la primera especie de pez en la que se demostró que su sexo biológico está determinado tanto por factores genéticos como por condiciones ambientales.
Es decir, la descendencia puede ser macho o hembra al depender no solo de sus genes, sino también del ambiente, especialmente según la temperatura.

Los primeros intentos de cultivo de esa especie de pejerrey se hicieron en Chascomús, provincia de Buenos Aires, en 1904.
Pero recién después de la década de 1980 se produjeron colaboraciones internacionales y avances tecnológicos que hicieron posible que el cultivo en cautiverio tuviera un desarrollo más sólido.
Ahora, científicos de la Argentina, Japón, España, México y Brasil publicaron en Reviews in Aquaculture una revisión de estudios en la que integran el conocimiento actual sobre la biología, el cultivo y las adaptaciones fisiológicas del pejerrey bonaerense y resaltan su potencial para el desarrollo de la acuicultura sostenible.
“El pejerrey es un pez oportunista: aprovecha cualquier situación ventajosa para establecerse”, contó a Infobae uno de los líderes del trabajo, el doctor Gustavo Somoza, ex director del Instituto Tecnológico de Chascomús, investigador superior ad honorem del Conicet y profesor de la Escuela de Bio y Nanotecnologías de la Universidad Nacional de San Martín (UNSAM).
Por ejemplo, si ocurre una inundación en un campo, una población de esa especie podría colonizarlo rápidamente. Si ese cuerpo de agua se establece, es probable que otras especies puedan competir mejor y lo desplacen.
Durante las últimas cuatro décadas, se llevaron a cabo investigaciones científicas e innovaciones para resolver los obstáculos que había en el cultivo de la especie.

El apoyo económico de la Agencia de Cooperación Internacional de Japón (JICA) y la colaboración académica con el científico Carlos Strüssmann, de la Universidad de Ciencia y Tecnología de Tokio, en Japón, fueron clave.
“Se buscó mejorar la supervivencia, el crecimiento y la adaptación del pejerrey a distintos ambientes, además de controlar la reproducción y reducir el impacto de enfermedades”, explicó.
Uno de los avances más importantes fue aprender a manejar la reproducción al usar la temperatura y la luz. Eso permite que los criaderos tengan huevos y larvas justo en el momento que lo necesitan y con una supervivencia muy alta.

Además, se crearon alimentos balanceados especiales para el pejerrey que ayudan a que crezcan sanos y fuertes, y se adapten mejor a distintos ambientes, según se detalló en la revisión cuyo primer autor fue Alejandro Mechaly, investigador en endocrinología y fisiologia de peces del Instituto de Investigaciones en Biodiversidad y Biotecnología del Conicet y la Fundación FIBA de Mar del Plata.
También se descubrió que el pejerrey bonaerense puede crecer tanto en agua dulce como salobre, lo que reduce el estrés y la aparición de enfermedades en los criaderos.
En el laboratorio, los científicos lograron producir pejerreyes estériles con el uso de técnicas como la triploidía, que evita la reproducción no deseada y permite dirigir más energía al crecimiento del pez.
Se generaron híbridos con otras especies, al buscar mejorar el tamaño y la velocidad de crecimiento, y se logró formar poblaciones de solo machos o solo hembras con tratamientos térmicos.

Recientemente, el doctor Somoza con los investigadores Guillermo Ortí, Yamila Cardoso y Juan Ignacio Fernandino consiguieron hacer la secuenciación del genoma del pejerrey.
“Este avance permitirá seleccionar ejemplares con mejores características para el cultivo, como mayor resistencia a enfermedades o un crecimiento más rápido”, resaltó el doctor Somoza, quien en 2024 fue reconocido por su trayectoria por la Sociedad Internacional de Endocrinología de Peces.
Aunque se avanzó mucho, la acuicultura sustentable del pejerrey bonaerense todavía tiene varios desafíos.
Para que sea sustentable, el cultivo del pez debe hacerse en ambientes controlados y se busca maximizar la producción sin dañar el ecosistema.
“Aún no hay una producción comercial de la especie. Sería interesante que se desarrolle en la Argentina para obtener alimentos saludables y rentables, mientras se cuida el agua, la biodiversidad y los recursos naturales”, enfatizó Somoza.
Los investigadores que hicieron la revisión publicada en Reviews in Aquaculture señalaron que aún hace falta investigar más para lograr que los sistemas de cría y alimentación del pejerrey que sean eficientes, económicos y cuiden el ambiente.

También es clave que más personas se capaciten en el manejo de la especie, y que la tecnología llegue a productores de distintas regiones para que todos puedan aprovechar los adelantos.
El trabajo en equipo entre científicos, técnicos y productores será fundamental para que la especie bonaerense tenga un lugar fuerte en la acuicultura del país.
En diálogo con Infobae, el doctor Juan Ignacio Fernandino, investigador del Conicet en el Instituto Tecnológico de Chascomús, explicó: “Ya tenemos el genoma del pejerrey bonaerense como referencia y eso nos permite avanzar en la búsqueda de genes”.

También están trabajando con la técnica de edición genética CRISPR. “Uno de los principales desafíos del pejerrey es que el crecimiento de cada ejemplar es lento y eso dificulta la producción comercial. Nuestro objetivo es reducir los tiempos de crecimiento mediante el uso de la edición genética”, comentó.
“Cuidar la biodiversidad local debería ser la prioridad de la acuicultura sustentable. De esta manera, se evitaría que el cultivo del pejerrey afecte a otras especies o al ecosistema”, subrayó el doctor Fernandino.
Si se sigue por ese camino responsable, el pejerrey bonaerense puede convertirse en una alternativa rentable, saludable y sostenible para la alimentación y la economía nacional.
pez,plata,escamas,acuático,pesca,animal,naturaleza,agua dulce,iridiscente,organismo,pejerrey,bonaerense
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Top House Dem dismisses probe into Jasmine Crockett’s security guard killed in SWAT standoff

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A top House Democrat is pushing back on calls for a probe into Rep. Jasmine Crockett, D-Texas, hiring a wanted fugitive as a security guard before he was fatally shot in a standoff with SWAT officers.
«I don’t know if that’s the House’s place to investigate,» Rep. Pete Aguilar, D-Calif., told Fox News Digital in a recent interview.
Diamon-Mazairre Robinson, 39, who used the alias «Mike King» while employed by Crockett, was shot and killed by Dallas SWAT officers earlier in March after a standoff in a hospital parking garage. Police were responding to an active warrant for him after allegedly impersonating law enforcement and recovered 11 firearms during the operation, some of which were stolen.
«It depends if she was using campaign money or House resources, but that’s something for House Administration [Committee] to deal with if that’s the case,» Aguilar added.
CROCKETT WARNS OF NATIONWIDE PROTESTS OVER ICE SHOOTING: ‘STATE-SANCTIONED EXECUTION’
Rep. Pete Aguilar, D-Calif., said he’s unsure if its «the House’s place» to investigate how Rep. Jasmine Crockett, D-Texas, hired a convicted criminal to provide security services. (Paras Griffin/Getty Images for Revolt TV ; Eric Lee/Bloomberg via Getty Images)
Crockett’s office paid King at least $6,300 for security services in 2025, according to a Fox News Digital review of Crockett’s members representational allowance (MRA). The congresswoman’s House campaign account also doled out $340 to King for security services in March 2025, according to Federal Election Commission filings.
The MRA funding bucket — made up of taxpayer dollars — is effectively an operating budget for each lawmaker to pay staff, cover security expenses, and handle other operational costs.
Fox News Digital reached out to the House Administration Committee for comment.
JASMINE CROCKETT UNDER FIRE AFTER REPORTEDLY HAVING ARMED GUARDS REMOVE ‘WHITE GIRL’ REPORTER FROM RALLY
Crockett has denied any wrongdoing and said her office followed every House protocol while employing Robinson, who she claimed did not raise any suspicions while a member of her security detail.
«There was never any reason to suspect that he wasn’t who he held himself out to be,» Crockett said in a statement released by her office.
Rather, Crockett has blamed «shortcomings» in the vetting process that failed to verify Robinson’s identity or catch his lengthy rap sheet, including multiple arrests for theft and violating probation.
«We are fortunate that this is someone who used those loopholes without malice,» Crockett said, adding that a preliminary review showed that Robinson had not committed any violent crimes.
Crockett dismissed questions about whether she knew about Robinson’s criminal history before hiring him during a recent interview with Fox News Digital.
«I’m going to refer you to my page,» the Texas Democrat said, referring to her social media post. «I made a statement and I said there would be no additional statements. You need someone to read it for you? I can find someone to do that.»

Rep. Jasmine Crockett, D-Texas, declined to provide additional comment regarding her fugitive bodyguard when pressed by Fox News Digital. (Fox News Digital Hired/Nicholas Ballasy)
JASMINE CROCKETT SUGGESTS GOP RIGGED HER DEMOCRATIC PRIMARY ELECTION: ‘THIS IS WHAT REPUBLICANS LIKE TO DO’
House GOP leadership has voiced openness to a probe, but cautioned that lawmakers are still learning details about the incident.
«I need to get the facts on did he have a background check … but there are processes in place,» House Majority Leader Steve Scalise, R-La., told Fox News Digital. «We’ll look at the possible need to tighten that up.»
Rep. James Comer, R-Ky., chairman of the House Oversight Committee, did not answer definitively when asked by Fox News Digital whether Republicans planned to investigate the incident, saying he was still reviewing the matter.
Aguilar said he did not expect Republicans to launch a formal investigation, citing Crockett’s loss in the Texas Senate primary against state legislator James Talarico, D-Texas.
«Jasmine didn’t win, so I assume that they’re probably not going to be focused on her as much,» Aguilar said, referring to House Republicans.

House Majority Leader Steve Scalise, R-La., signaled openness to a House probe, but said he needs to review the incident further. (Getty Images)
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Rep. James Walkinshaw, D-Va., said the incident is likely to spark conversations among lawmakers about scrutinizing the vetting process lawmakers use for security personnel.
«We need to tighten up the processes around members hiring security,» Walkinshaw told Fox News Digital.
Crockett’s office did not respond to a request for comment about how Robinson was vetted before being hired as a member of her security detail.
dallas shooting, crime world, steve scalise, investigations, democrats
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Donald Trump revela conversaciones “productivas” con Irán y suspende la ofensiva militar por cinco días, pero el régimen de Teherán lo niega
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Iran conflict tests Pakistan amid own border clashes as Islamabad touted as venue for US-Tehran talks

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Pakistan is walking a tightrope as the Iran war intensifies, with that balance growing more precarious with each passing day.
Islamabad has so far pursued cautious diplomacy, condemning the strikes on Iran, while simultaneously urging de-escalation. But analysts warn it cannot remain insulated from competing pressures.
«Pakistan is putting itself forward as a mediator between the U.S. and Iran, but unconvincingly,» Edmund Fitton-Brown, a senior fellow at the Foundation for Defense of Democracies told Fox News Digital. «Its own record of staying out of military entanglements is unimpressive.»
TRUMP PRESSES NATO PARTNERS ON SUPPORT AS HEGSETH BLASTS HESITATION
At the forefront of the tensions is a new defense agreement with Saudi Arabia, which states that aggression against one will be treated as a threat to both. Widely seen as one of Pakistan’s most consequential defense agreements, it commits the country to Riyadh, while risking confrontation with Iran.
Shia Muslims holding portraits of Iran’s slain supreme leader Ayatollah Ali Khamenei take part in an anti US-Israel protest in Islamabad on March 6, 2026. (Aamir Qureshi/ AFP via Getty Images)
Pakistan, the only nuclear-armed Muslim state, already has troops stationed in Saudi Arabia for training and defense support and has said there is «no question» of coming to the kingdom’s aid.
«Remember, Pakistan is geographically part of both South Asia and Central Asia, as well as the wider Gulf/MENA region too. Pakistan has always pursued peace, dialogue and order because we know what war does to our region,» Mosharraf Zaidi, spokesperson for foreign media to the Pakistani prime minister, told Fox News Digital.
Within days of the war’s outbreak, the country’s army chief, General Asim Munir, made an «emergency» visit to Saudi Arabia, where top officials discussed joint responses to Iranian strikes. It was the first true test of the pact.
Relations are strong between the two nations, and Riyadh remains a key economic lifeline for Islamabad. Saudi Arabia has already been making arrangements to support energy supplies, as war-driven fuel disruptions hit import-dependent Pakistan.
SHADOW FLEET UNDER FIRE: IRAN’S STRAIT SHUTDOWN COULD SQUEEZE RUSSIA’S WAR CHEST, CHINA’S OIL LIFELINE
Yet Pakistan’s relationship with Iran is equally critical.
The two share a 565-mile border along with deep trade ties and significant religious connections.
Pakistan is home to the world’s second-largest Shiite community after Iran. Pro-Iran regime protests in the wake of Supreme Leader Ayatollah Ali Khamenei’s assassination turned deadly, forcing military intervention and curfews.
Maintaining ties with Tehran is crucial for containing domestic tensions and staving off an insurgency from the minority Baloch community there.
Iran is also an important economic partner to Pakistan, which has been facing a severe economic crisis. The two conduct significant trade, with a new goal of $10 billion by 2028.
Pakistan’s foreign minister has held «constant conversations» with his Iranian counterpart throughout the conflict. And last week, a Pakistani oil tanker transited the essentially blockaded Strait of Hormuz. Analysts noted it was the first non-Iranian cargo ship to do so since tensions escalated, suggesting that safe passage may have been negotiated. Officials add that more Pakistan-bound oil tankers are likely to cross the strait in the coming days.

A screenshot of a marine traffic terminal showing vessels in the Strait of Hormuz on March 4, 2026. (Kpler/Marine Traffic)
Most of Pakistan’s crude and LNG imports pass through the Strait of Hormuz. But as the war grinds on, analysts warn Pakistan’s room for neutrality is shrinking.
Pakistan recently went against Iran, backing a Gulf-led resolution at the United Nations condemning regional aggression. Russia and China abstained.
Meanwhile, Iran’s foreign minister just called for regional coordination in separate calls with Pakistan, Turkey and Egypt.

Shia Muslims holding portraits of Iran’s slain supreme leader Ayatollah Ali Khamenei take part in an anti US-Israel protest in Islamabad on March 6, 2026. (Aamir Qureshi/ AFP via Getty Images)
At the same time, Islamabad must also navigate relations with Washington, yet another key partner.
Under President Donald Trump’s second term, Pakistan has sought closer relations with the U.S., even floating his name for the Nobel Peace Prize.
TRUMP IS REALIGNING WORLD ENERGY MARKETS AND THE IRAN STRIKES ARE ACTUALLY HELPING
Questions are also emerging in Washington. During a White House briefing, Press Secretary Karoline Leavitt said the administration was coordinating with the Pentagon to assess whether Pakistan is supporting Iran, while describing India as a «good actor.»
India’s positioning has added further pressure, with Prime Minister Narendra Modi’s recent visit to Israel.

Indian Prime Minister Narendra Modi meets with Prime Minister of Israel Benjamin Netanyahu in New Delhi, India on Feb. 25, 2026. (Photo by Press Information Bureau (PIB)/Anadolu via Getty Images)
«There is no contradiction in being absolutely committed to peace, dialogue and order. The strong relationships Pakistan has with the United States, with Saudi Arabia, with Iran and with China are a testament to Pakistan’s commitment,» the Pakistani prime minister’s spokesperson, Zaidi said.
So far, Pakistan has effectively positioned itself at the forefront of mediation efforts to end the ongoing conflict, leveraging its ties with all three powerhouses.
Reports indicate that high-level talks between the U.S. and Iran are set for Islamabad as early as this weekend.
«Pakistan wants to matter to the U.S. and to be a better partner than India. Because the Afghan Taliban have alienated Islamabad since 2021, there are few remaining sore points between the U.S. and Pakistan, with the latter able to present as an ally against terrorism,» Fitton-Brown said. «And most regional parties want to see the crisis end sooner rather than later. But nobody wants to see the Islamic Republic strengthened in Iran.»
The spiraling war comes at a critical time for Pakistan’s already stretched military. Tensions with India remain elevated, while border clashes, airstrikes, drone attacks and rising civilian casualties have become the norm with once friendly neighbor Afghanistan.
The nations nosedived into an «all-out war,» just days before the Iran conflict broke out, and the violence shows no signs of easing after fresh Pakistani strikes recently hit the Afghan capital city of Kabul.

Afghan Taliban fighters patrol near the Afghanistan-Pakistan border in Spin Boldak, Kandahar Province, following exchanges of fire between Pakistani and Afghan forces. (REUTERS/Stringer/File Photo)
«This geography and the region’s history is why Pakistan steadfastly rejects India’s efforts at regional hegemony, it is why Pakistan is pursuing a termination of the Afghan Taliban regime’s support for terrorist groups,» Zaidi said. «We seek a complete cessation of terrorism emanating from territory currently controlled by the Afghan Taliban.»
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With Pakistan already managing tensions on both its eastern border with India and its western frontier with Afghanistan, a destabilized Iran could push that strain further.
«If Islamabad is destabilized, it will be extremely bad news regionally and globally,» Edmund Fitton-Brown told Fox. «The idea of a nuclear power under jihadi rule doesn’t bear thinking about.»
middle east, pakistan, war with iran, afghanistan
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