Glass Eel Surveys

Posted by Jim Kerr - 20/04/2015 17:49:00

Seastar Survey is currently working in collaboration with CEFAS to trawl for glass eels in the UK. Glass eels are the unpigmented juvenile lifestage of European eel, Anguilla anguilla. Juvenile European eels migrate from their birthing grounds in the Sargasso Sea ca. 6000 km away to rivers and estuaries around Europe where they grow and mature for many years after before returning to the Sargasso Sea to spawn.

The European eel is a threatened species that has experienced a huge reduction in recruitment in recent decades. It is estimated that recruitment is currently less than 10% of historic levels. The species receives protection under the The Eels (England and Wales) Regulations 2009, CITES (Convention on International Trade of Endangered Species of Wild Fauna and Flora), and the European Habitats Directive (92/43/EEC).

European glass eels are vulnerable to human pressures in the form of overfishing, barriers to their upstream migration and passage through hazardous routes such as power plant cooling systems. Seastar Survey is working with CEFAS to assess the number of glass eels utilising hazardous areas of the UK coastline to inform management decisions. Of particular importance is legislation that requires abstraction facilities in locations through which large numbers of glass eels pass to be screened with 1-2 mm screens. A requirement that will have heavy financial implications for energy companies.

Seastar Survey Ltd. Awarded Long Term Hydrographic Monitoring of Cardiff Harbour Contract

Posted by Jim Kerr - 19/04/2015 12:51:00

 

 

 

In April 2014 Seastar Survey Ltd. was awarded a three year contract to carry out ongoing bathymetric monitoring for Cardiff Harbour Authority to inform dredging operations. Work is carried out on a monthly basis on a dedicated small survey boat, Lady Jane, using a single beam echosounder and Real-time Kinematic (RTK) corrected positioning (horizontal and vertical corrections). The data is processed in house and delivered to the client monthly.

Seastar Survey Ltd. Develop a Freshwater Lens Camera System

Posted by Jim Kerr - 15/04/2015 13:52:00

Seastar Survey Ltd. have developed a specialist underwater camera system designed to acquire HD video footage in waters with very high turbidity (visibility < 10 cm). The system uses a freshwater lens to enable quantitative habitat assessment to be undertaken in areas previously thought inaccessible to drop down video survey techniques.

 

- Full 1080p video and hi-resolution digital stills

- Field of view of more than 60 cm diagonal.

- Compatible with a variety of camera systems.

- Tested in some of the most challenging conditions in the UK, including Morecambe Bay and Solway Firth.

- Can be operated in tidal flows of up to 3 Knots.

- Variable height from seabed, allowing site specific adaptation to system.

- Deployable from most vessels capable of handling a SWL of 150 Kg.

- Available for hire.