"Sustainable shellfish farming

Shellfish farming is generally seen as an activity that has a relatively low negative impact on the environment. No chemicals or antibiotics are used in shellfish production and it relies on a high standard of water quality. The SLMC is supportive of the development of shellfish aquaculture in Strangford Lough, providing it does not compromise the environmental or landscape value of the Lough and takes into account amenity interests, and issues relating to navigation.

SLMC has identified legitimate concerns in relation to the development of this industry and is working with Government and industry interests to address them:


The main concerns

Loss of quality of visual amenity for local people and tourists
Effects on navigation routes
Intensive culture can cause loss or modification of habitat, disruption of sediment regimes, and disturbance to wildlife.
Introduced commercial shellfish might breed and establish in the wild so threatening the ecological balance
Pest species (plants and animals) can be accidentally introduced with commercial shellfish

SLMC is pressing for a move towards a cumulative, strategic assessment of aquaculture. The Committee has also been working to develop a system whereby aquaculture development might be voluntarily zoned, or at least not developed in the Lough's most sensitive areas. To date the issues surrounding this have not been resolved but work is on going. SLMC continues to be very active in assessing the suitability of individual applications. It has made recommendations on the size and scale of developments, as well as on licence conditions, to reduce conflict with environmental interests and other Lough users. In addition, The Committee supports the use of voluntary codes of conduct for aquaculturists.

If developed at an appropriate scale and if carefully sited and managed shellfish aquaculture should be sustainable economically and environmentally. However, vigilant quality control and the co-operation of individual operators is essential.

Regulation

In this fast growing industry there is a need to consider the implications of new cultivation methods, the species farmed and sources of stock on a continuing basis. Aquaculture is regulated under the Fisheries Act (NI) 1966, as amended 1991 and 1993, and the Habitats and Birds Directives.

DARD are responsible for licensing shellfish introductions and movements in Northern Ireland. It is illegal to introduce new species to aquaculture in Northern Ireland without a licence and all species must be certified as disease free before introduction. Shellfish moved for transplantation within Northern Ireland must have a shellfish movement permit from DARD.

Aquaculture licences can include conditions that can limit tonnage, restrict harvesting etc where appropriate.

Caged fin fish farming

SLMC remains strongly opposed to the introduction of caged fin fish farming (eg salmon farming) on Strangford Lough for environmental reasons. However, new techniques using shore based closed systems have yet to be examined by the Committee.

How shellfish are cultivated

Techniques for growing shellfish are being refined and there are many experimental operations in Strangford Lough as well as commercial activities. Centre for Marine Resources and Mariculture, an extension of Queen's University at Portaferry has been set up for the purpose of developing environmentally sustainable methods of aquaculture.

Oyster arming is currently the most economically important fishery in the Lough with an annual turnover in excess of that from commercial fishing and providing direct employment for about 10 people. The principle species cultivated is the Pacific oyster grown in mesh sacks on trestles at mid to low water, mainly at Paddy's Point and Castleward Bay.

Native oysters, considered by many to be superior in taste, are also being ranched on the sea bed in a sheltered sandy area in the north west of the Lough.

Manilla clams have also been farmed in the Lough. They are sown into sand at the low water mark and protected from bird predation with nets.

Mussels grow extremely well in Strangford Lough. Both mussels and scallops may be cultivated on the sea bed or on ropes suspended from long lines."

Extract from SLMC Third Report 2001, reproduced by kind permission from SLMC

Publications
Strangford Lough SAC / SPA Management Scheme (2001) EHS CH 4

Useful link:
www.dardni.gov.uk
www.qub.ac.uk/bb/cmar

Image Library
Animal Life