Several active compounds are derived from seaweeds, such as: fucoids (fucane), fucoxanthin, palmarin, laminaran, kainic acid, heparin and other sulphated oligo- and polysaccharides like carrageenan and alginates (used in a.o. food, cosmetics, medicines and agrochemicals). Some of them have direct effects on the human metabolism, others are antioxidants with a probable indirect mode of action. Several seaweed species contain high levels of protein, making them of interest for application in fish/animal feed. Cold water macro-algae also contain interesting levels of fatty acids (omega 3). Many macro-algae contain secondary metabolites possessing antibacterial, antifungal and anti-protozoan properties which have been demonstrated to have an anti-fouling effect.The unique composition of seaweeds make them a renewable source of compounds and raw materials. The quality of its protein is comparable to fish protein, giving the possibility to use this instead of fishmeal in fish feed.
With an annual growth of nearly 10%, intensive fish farming is the world’s most rapidly expanding food-producing sector which represents a major stake in global food supply. A decline in availability and increasing costs of fish meal, a key component of farm fish diet, has created a need for alternative sources for the fish-farming industry. The dependency on fish meal has declined and other sources of protein are found in terrestrial plants and animals.
Seaweeds are a valuable food and feed source and contain significant quantities of valuable proteins, lipids, vitamins and minerals (Holdt & Kraan 2011). The added value of including seaweed in aquaculture diets has been demonstrated (Rao, Mantri & Ganesan, 2007; Soler-Vila, 2009).
Amino Acid Score
Anatomy, Location and Reproduction
With its holdfast the Seaweed attaches itself to the ocean floor. It generally grows just underneath the water surface and therefore can be found most of the time in the sublitoral and middle-litoral zone.
With its holdfast it does not take up nutrients. For that purpose seaweed uses its meristeem. Seaweed has a very characteristic form of reproduction.Soon a scheme will be published here to give you a quick overview on which phases seaweed uses to reproduce.