Sharks are ecological important inhabitants of most of the world’s oceans and seas. Still their life-history, which is dictated by slow growth rates and late maturity, makes most species, especially demersal- and coastal sharks, prone to exploitation through target- and nontarget fisheries. Another threat …

Coastal lagoon ecosystems are transitional waters, that provide important ecological features and deliver valuable services to mankind. However, due to their geographical positioning at the coast line and physical restrictions, coastal lagoon ecosystems are highly vulnerable towards environmental and …

It has been widely recognized that the rapidly increasing amounts of marine plastic debris are causing problems. However, current studies are mainly focused on the presence and effects of macroplastic and often do not consider microplastic. WMR has conducted research on microplastic uptake by North Sea …

Electric pulse fishing is a very promising and innovative solution instead of using tickler chains such as beam trawling, to enable the catch flat fish. Bottom-trawling activities on the marine ecosystem cause the scrape of the surface or dig into the seabed. The penetration of the gears produce the …

Dit is de samenvatting van een onderzoek dat is uitgevoerd voor de afdeling Finance & Control van Heerema Marine Contractors (HMC) ter optimalisatie van de diensten in het kader van het Turnaround project. Het onderzoek eindigt met enkele aanbevelingen voor de afdeling. Heerema Marine Contractors is …

In the search for low greenhouse gas propulsion, the dual fuel engine provides a solution to use low carbon fuel at diesel-like high efficiency. Also a lower emission of NOx and particles can be achieved by replacing a substantial part of the diesel fuel by for example natural gas. Limitations can be …

Global climate change (CC) affects marine mammals, such as cetaceans, by exposing them to an altered marine environment. Cetaceans are indirectly influenced by CC (e.g. through their prey, warmer environment). They are indicator species, significant to marine ecosystems and one of the most endangered …

Coastal soft-sediment habitats are some of the most valued ecosystems due to their high productivity, sustaining coastal food webs. However, coastal soft-sediment habitats are under pressure due to human activity and sea level rise. To preserve or restore soft-sediment habitats different management strategies …

The seeding of mussel seeds is an important factor within the mussel culture as losses can be as high as 75% within the first 4 weeks after seeding. Therefore it is important to get more knowledge about the factors that can cause mortality within the first weeks after seeding. With seeding high local …

To increase the yield and quality of aquaculture feed, the effects of N and P concentrations on biomass productivity and cell composition were examined in the marine diatom Skeletonema costatum. Batch-cultured microalgae in Walne’s medium with 3.5 ± 0.5 mmol L-1 N-NO3- and 0.30 ± 0.05 mmol L-1 P-PO43- …