April Facebook Twitter Whatsapp Google Linkedin Email Researchers count cetaceans from special airplanes with circular windows. This way they have an unrestricted view over the sea. The size and spread of porpoises, dolphins and whales in the European North Sea and connected Atlantic waters is mapped through these aerial surveys. What grows underwater on gas platforms in the North Sea? Joop Coolen takes samples with his underwater airlift sampler and explains in this short film what he sees. Wageningen Marine Research conducts research into the influence of large man-made structures, such as oil and gas platforms, wind farms and shipwrecks, on the marine environment. Wageningen Marine Research researches the stomachs of stranded harbor porpoises. Harbor porpoises eat approximately ten percent of their body weight in fish per day. Their diet mainly comprises gobies, whiting, sand lances, herring and sprats. These mammals are in constant danger of starvation. How harmful are balloons and their debris to nature? After all, aren't they made of latex, a natural rubber, and therefore biodegradable? Wageningen Marine Research provides 5 facts & figures to help you decide: to release balloons, or to keep them on the ground?