Mayleen Schlund
https://zenodo.org/record/6563042#.Ys6d6sVByUk
Abstract
The aim of this thesis was to assess the growth difference of the seaweed species Saccharina latissima at an Integrated Multi-Trophic-Aquaculture (IMTA) site compared to a reference site without fish cultivation in Sørvágsfjørður, Faroe Islands. Therefore, one growth season of S. latissima, CTD data and nutrient parameter (nitrate, ammonium, phosphate, silicate) were analysed. The seasonal temperature and salinity data showed similar conditions between both sites. Currents were modelled differently between the IMTA site and the reference site. Significant differences in nitrate, phosphate were observed(P < 0.05). Ammonium at the IMTA site was measured higher in a four-meter depth (max. 5.34 ?M) compared to the reference site (max. 2.9 ?M). However, these environmental parameters seem to had no influence on the actual growth of S. latissima. Due to the appearance of the snail species Lacuna vincta, the growth of S. latissima changed at the IMTA site in August and September 2020.
These results showed that S. latissima developed at both locations after deployment into the fjord. It should be determined to investigate the cause of the occurrence of the snail to further cultivate S. latissima in Sørvágsfjørður. Also, if the appearance of L. vincta was a coincidence or if these strong influences occur annually in similar exposures. However, the environmental parameters of the fjord provided good growth conditions for S. latissima at both sites.
