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Captive bluefin tuna inside a transport cage. The cage is being towed by a tug from fishing grounds in Libya to Tuna farms in Sicily.

Sustainable Aquaculture

Greenpeace seeks to ensure clean and healthy oceans for the future, and part of this is working to improve the standards of international seafood trade. As wild stocks decline, the demand for farmed shrimp, salmon, tuna, tilapia and other marine finfish is on the rise. Therefore, due to its sheer size and its impacts on the oceans, the aquaculture industry is an important part of the overall picture.

Aquaculture is not a solution to overfishing. Traditional forms of aquaculture can and do make substantial contributions to food supplies in areas of the world where food needs are acute, but these need to be sustainable.

Many modern aquaculture practices emphasise the unsustainable production of species for high-value export markets. Rapid development and expansion of intensive aquaculture for species such as salmon and shrimp has, for example, resulted in widespread degradation of the environment and the displacement of coastal fishing and farming communities.

Unsustainable aquaculture also negatively impacts on the food supplies and food security of developing coastal countries. Aquaculture development often blocks access to common lands, used by local people for fishing and cleaning (collecting of seafood from the ground), and takes away traditional food sources, for use in fishmeal and oil production for aquaculture production. 

What are the main problems with aquaculture? 

Unsustainable aquaculture can devastate our oceans and the environment and impact on local people's food and security.

Some examples include:

  • the extraction of marine species from oceans, including wild juveniles vital for future stock growth, increasing the burden on wild fish stocks and having major food security implications;
  • fishmeal and so-called 'trash fish' used for feed production - often the main food for local people - taken for use in aquaculture ponds;
  • the release of organic wastes (that, for instance, act as plant nutrients for harmful algal blooms) and toxic effluents into the oceans;
  • the destruction of coastal ecosystems, displacement of coastal communities and depletion of fresh water sources to build aquaculture ponds.

What kind of aquaculture is sustainable?   

There are no species that are sustainable as such. The sustainability of a species depends on its feeding and lifecycle habits, as well as the farming operation. Only species that are plant eaters, who can breed in captivity, and whose farming does not produce high levels of nutrient output can be cultivated sustainably.

There are a number of conditions an aquaculture operation must adhere to in order to be sustainable. Among other things, an aquaculture operation can only be regarded as sustainable if it:

  • is continually moving towards plant-based feeds originating from sustainable agriculture;
  • does not use fishmeal or fish-oil-based feeds from unsustainable fisheries and does not represent a net loss in fish protein yield;
  • does not use wild-caught juveniles;
  • only cultivates species that are native in open water systems, and then only in bag nets, closed-wall sea-pens or equivalent systems (if there is cultivation of non-native species, it must be restricted to land-based tanks);
  • does not result in negative environmental impacts in terms of discharges and effluents to the surrounding areas;
  • does not result in negative effects to local wildlife (plants as well as animals) or represents a risk to local wild populations;
  • does not use genetically engineered fish or feed;
  • uses stocking densities that minimise the risk of disease outbreaks and transmission;
  • does not deplete local resources, for example, drinking water supplies and mangrove forests;
  • does not threaten human health;
  • supports the long-term economic and social well-being of local communities.

Achieving sustainability requires adhering to a full set of measures and cannot be reached through simply implementing one or two. 

How can consumers be sure that the products they buy come from sustainable and fair aquaculture?

No current certification scheme covers all of the issues essential to ensure products come from sustainable and fair aquaculture operations. It is the responsibility of retailers to ensure that the products they buy come from operations adhering to the conditions described above. Retailers must, until a reliable certification system is in place, communicate to their customersthe sustainability of their products.

In turn, customers must also challenge their retailers to ensure that their supplies stick to all of these conditions. Unless consumers can be assured that products come from sustainable operations, they should not buy them.

The Greenpeace report, Challenging the aquaculture industry on sustainability, offers advice to the industry on becoming sustainable, and provides guidelines to retailers and seafood suppliers on how to ensure they only buy aquaculture products from sustainable operations. 

The latest updates

 

Can Japan save the world’s most valuable fish?

Feature story | July 21, 2010 at 13:49

TOKYO: Japan is celebrating “Marine Season” (“Umi-No-Shun-Kan”) this week and it’s also the International Year of Biodiversity. What better way to mark the occasion here than to launch a campaign to protect the most threatened fish species?

Count me in

Sign the petition for a global network of marine reserves

A call for activism!

Blog entry by LisaV | June 18, 2010 8 comments

From Sabine, the Assistant Cook and one of the activists on board the Arctic Sunrise in the Med right now - for our  bluefin tuna campaign . I have been at sea for almost five weeks now. To be out on the sea puts everything into...

Purse-seining season closes early for Mediterranean bluefin

Blog entry by LisaV | June 9, 2010 1 comment

Update from oceans campaigner - Willie MacKenzie Today, or at 23.59 tonight, to be exact, the purse seining season for bluefin tuna in the Mediterranean is being closed. A week early . I’m back on land now, having left the...

More action for bluefin tuna

Blog entry by JulietteH | June 7, 2010

Despite the violence faced last Friday by activists defending the bluefin, Greenpeace took action again today to free bluefin tuna. The Arctic Sunrise approached a net cage for fish being towed by a Tunisian tug-boat and attempted...

Bluefin Tuna Action in the Mediterranean

Image | June 7, 2010 at 15:10

07 June - Mediterranean Sea. An aerial view of Greenpeace inflatables and two Greenpeace ships, the MY Arctic Sunrise and the MY Rainbow Warrior, during a non-violent direct action against Tunisian fishing vessels. Find out what happened .

Taking action, and taking blows, for bluefin

Blog entry by JulietteH | June 4, 2010 5 comments

This is the latest from Willie Mackenzie, from the Mediterranean. Greenpeace took action in the Mediterranean today, to stop some French purse seiners catching bluefin. And it's fair to say, things kicked off a bit fast . ...

Activists attacked while trying to save tuna

Image | June 4, 2010 at 21:00

Greenpeace activists take non-violent direct action to stop bluefin tuna fishing in the Mediterranean before being rammed and attacked by industrial fishermen. Read More

Greenpeace inflatable damaged

Image | June 4, 2010 at 21:00

A badly damaged Greenpeace inflatable boat is recovered after being violently attacked by crews from tuna purse seine fishing vessels. Two of the seven Greenpeace inflatable boats were slashed with knives and sank when run over by purse seining...

Activist injured during attempt to save bluefin tuna

Feature story | June 4, 2010 at 17:41

As bluefin tuna fishing began in the Mediterranean today, just south of Malta - we set out to rescue endangered fish trapped inside a massive purse seine net. But our boats and activists were met with violence as several fishing vessels closed in...

With ICCAT in the driving seat – what hope is there for bluefin?

Blog entry by LisaV | June 1, 2010

The latest from Willie Mackenzie - UK oceans campaigner in the Med. There’s an analogy I sometimes use to explain the problem of overfishing. Imagine you are in a car hurtling at full speed down a hillside towards a cliff.

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