Keyword

Geoscientific information

183 record(s)
 
Type of resources
Available actions
Topics
Keywords
Contact for the resource
Provided by
Years
Formats
Representation types
Update frequencies
status
Scale
Resolution
From 1 - 10 / 183
  • Categories  

    During three cruises in the Mid Atlantic Ridge area in 2016 and 2017, we studied the biomass of mesopelagic fish and its potential as a source of protein and oil for animal feed and human consumption. We collected samples of mesopelagic species down to a depth of 600?m, studied fish behaviour, identified and quantified the species composition of the catches, analysed the chemical composition of the catch samples, and evaluated the presence of unwanted substances. Results showed that Maurolicus muelleri (Mueller's pearlside) and Benthosema glaciale (Glacier lantern fish) were the most abundant fish species in our samples and catches containing 80% fish can be a good source of protein and marine lipids including eicosapentaenoic acid (C20:5n3) and docosahexaenoic acid (C22:6n3). Unwanted substances, except for Cd and As, were present at levels far lower than the limits set by European Union regulations. However, our experiments identified challenges that may limit the efficiency of commercial operations in the Northeast Atlantic. Combined real-time optical and/or multifrequency acoustic systems will be needed to improve species identification and ensure cost-effective fishing operations. Also, selective trawls that target only fish and release unwanted species are needed to secure high-quality oils and proteins.

  • This is the first map of sandbanks in Bulgarian Black Sea drawn based on expert interpretation of the following data: point data on the type of substrate (sediments, hard), grain size of sediments, sediment thickness determined by divers, acoustic profiling of the seabed morphology.

  • Categories  

    During three cruises in the Mid Atlantic Ridge area in 2016 and 2017, we collected samples of mesopelagic species down to a depth of 600?m and analysed the chemical composition of the catch samples. We present gross proximate composition (g /100 g fresh weight) and fatty acid composition (% of total fatty acids) in mesopelagic raw material samples (values are mean ± standard deviation of 2–4 samples).

  • Categories  

    During three cruises in the Mid Atlantic Ridge area in 2016 and 2017, we collected samples of mesopelagic species down to a depth of 600?m and analysed wax esters, triglycerides, free fatty acids, cholesterol and phospholipids (g/100 g oil) of four catch samples.

  • The map was provided by the Federal Agency for Nature Conservation (BfN) delineating reef areas primarily located within the Natura 2000 sites "Sylter Outer Reef" and "Borkum-Reefground". The delineation was done by use of backscatter data, in-and epifauna sampling including underwater videos and scientific diving within different research projects coordinated by the Federal Agency since 1998.

  • Map of broad habitat types in Bulgarian Black Sea shelf which equate to one or more habitat types of the EUNIS classification

  • The map presentsapreliminary result of a currently running project on benthic habitat mapping in the German North Sea funded and coordinated by the Federal Agency for Nature Conservation(Bildstein et al. 2014, Pesch et al. 2016). Full coverage biotope mapping was accomplishedby applying Random Forests on site specific data on six infaunacommunitiesand predictor data on e.g. topographical and sedimentological features of the sea floor for a 600 m x 600 m raster. The benthic communities had been derived from infauna abundance data by use of fuzzy clustering (for corresponding methodological details please refer to Fiorentino et al. 2017).

  • Map of benthic biotopes in the sediments in part of Natura 2000 SAC Ropotamo, the Bulgarian Black Sea. The biotopes were defined based on the sediment type, depth range and the typical associated macrozoobenthos communities as differentiated by multivariate similarity analyses.

  • The map was provided by the Federal Agency for Nature Conservation (BfN) delineating reef areas primarily located within the Natura 2000 sites "Sylter Outer Reef" and "Borkum-Reefground"(BfN 2004). The delineation was done by use of backscatter data, in-and epifauna sampling including underwater videos and scientific diving within different research projects coordinated by the Federal Agency since 1998.

  • Categories  

    During three cruises in the Mid Atlantic Ridge area in 2016 and 2017, we collected samples of mesopelagic species down to a depth of 600?m and evaluated the presence of unwanted substances. Except for Cd and As, toxic compounds were present at levels far lower than the limits set by European Union regulations.