This is known as management from an 'ecosystem perspective'. There is very little point in trying to maintain the stock levels of a single fish species if at the same time we allow fishing to damage to its (or other species') habitats, or destroy its food sources or the other species that it relies on. Put simply, a healthy ecosystem is essential to maintaining a healthy source of fish.

The trouble is we know very little about marine ecosystems; either the complex relationships between all the species within each type of ecosystem, or how different species respond to environmental change and human impacts such as pollution and climate change. It is therefore very different to estimate how much fish can be taken without upsetting delicate ecosystem balances.

The solution is to follow the precautionary principle - i.e. the less we know, the more care we must take about both the amount of a target species we take, and what methods we use to catch it.

Most importantly, marine reserves must be central to any management plan. Marine reserves are like national parks at sea, where fish stocks can recover. No mining, dumping or fishing is allowed within their boundaries. Marine reserves are essential for the recovery and protection of marine life. Importantly, if mistakes are made in managing the areas where fishing is allowed, we have a better chance of reversing the damage if there are healthy marine reserves nearby.

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Sensitive habitats include those that contain unique species and / or are species that are particularly vulnerable to human impacts. These include important breeding areas or nursery grounds for young fish, and areas that contain species that are already under threat. Sensitive areas must be given the strongest protection possible from the impacts of fishing.

Sustainable fisheries support this by: following all the regulations that apply to them; providing information to scientists; and reporting problems as soon as they occur. Their management plans allow for a quick response to close the fishery, or areas within the fishery, if negative impacts are suspected or identified.

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Sustainable fisheries only take a small percentage of the overall fish stock. This allows stocks to be maintained at plentiful levels, and considers both human use of those stocks and the ecosystem as a whole. For many already overfished and depleted stocks this means taking no fish, or significantly reduced levels of particular fish species, until stocks return to healthy levels. A fishery has a far greater chance of survival if it takes a small proportion of large healthy stocks, rather than a large proportion of a small, unhealthy stock.

Maintaining stocks at healthy levels is particularly important for slow-growing species such as sharks, skates and rays that produce few young; and for forage fish (such as herring, menhaden, squid, and krill) which though abundant are key prey for many larger marine species and are vulnerable to environmental impacts in many areas, meaning they can suffer significant population fluctuations.

Fisheries also often catch more than one species, but all too often management policies only address the more commercially valuable species. In sustainable fisheries that target a mixed range of species, all species are assessed and managed, and the most vulnerable and least healthy stocks are protected as a priority.

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Sustainable fisheries take every precaution to only catch the species they are targeting. They only use fishing methods that are suitable for the marine habitats in which they operate, and never use methods that permanently damage the sea bed; they also avoid breeding grounds and areas containing young fish, or which are home to endangered or protected species. If accidental catch becomes a problem in an area, they stop fishing there.

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Food chains in the ocean are not linear, but rather operate as complex webs. This means that taking too much of one species can sometimes have unexpected consequences for other species in the food web. Sustainable fisheries regularly monitor ecosystem impacts to prevent substantial ecosystem changes.

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Climate change and pollution have devastating effects on ocean life. Climate change warms the oceans and changes important chemical processes. Pollution poisons and chokes marine life. Sustainable fisheries are energy efficient and minimise chemical use and waste production. They work to ensure that they leave nothing in the sea that should not be there, and that all materials for fishing, storage and transport of catches are returned to land and re-used, recycled or reprocessed in an environmentally responsible manner.

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It is also important to consider the impacts of fisheries on people. Illegal, Unregulated and Unreported (IUU), or pirate fishing is a huge problem. It steals much needed food sources from their rightful owners and undermines responsible fisheries management.

Sustainable fisheries operate under local, national and international laws and regulations. This includes reporting any IUU practices they witness during fishing operations to the relevant authorities; and, where possible, providing financial assistance for monitoring, control and surveillance to help poorer nations ensure regulations and management plans are enforced.

Sustainable fisheries look after the people they employ, they respect human rights and labour laws, pay fair wages and take care of their employees' health and welfare. Sustainable fisheries also take care of people who may be impacted by the fishing of their waters. This includes ensuring that fishing access agreements are fair, and that all stakeholders, particularly local communities who depend on fishing for food and livelihoods, are involved in management decisions.

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We all want to buy sustainable fish. To do this we need to know exactly where the fish we buy is from, and how it was caught. Good traceability combined with clear labelling is key to stopping unsustainably caught fish and illegally caught fish getting on to the market.

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