Collagen is the principal constituent of the fiber-network layer of our skin. More than a third of the body's protein is collagen, and it can account for an even higher percentage in particular parts of the body. Collagen makes up 70% of our skin tissue.
Sea lice are parasites of the Caligidae family of arthropods and are among the most notorious pests affecting cultured marine fish.They have a particularly large impact upon salmonid fish production.ea lice on a salmon. (Wikimedia Commons). Sea lice are parasites of the Caligidae family of arthropods and are among the most notorious pests affecting cultured marine fish. They have a particularly large impact upon salmonid fish production.
Sarcodina (phylum Protozoa, subphylum Sarcomastigophora) A superclass of protozoa which form pseudopodia for feeding and locomotion. There are three classes, and many orders. The majority of species live in marine aquatic environments but some occur in fresh water (and are important members of the soil fauna) and some are parasitic in the intestinal tracts of vertebrates and invertebrates.