During a salmon run, bears will only eat the skin and discard the rest of the fish. This is because the layer just below the skin is the fattiest. Salmon skin isn't like chicken skin, it contains lots of good fat, omega 3 fatty acids. So, yes it is healthy to eat. Bears, wolves, eagles, seagulls ( when the salmon are young ), orcas, and other fish. Also humans eat a lot of salmon.
One fascinating new area of health benefits involves the protein and amino acid content of salmon. Several recent studies have found that salmon contains small bioactive protein molecules (called bioactive peptides) that may provide special support for joint cartilage, insulin effectiveness, and control of inflammation in the digestive tract.
Seaweed health benefits and seaweed eating have been mainly explored by island and coastal peoples. Japanese culture has developed seaweed cuisine to a notable level. The flavours and textures add a subtle and exotic element to Japanese food which has made it increasingly popular in the west. They have perhaps exploited seaweed's culinary possibilities more than any other nation. Where most nations manage one or two seaweed types at most, the Japanese have five common types in regular use. In Japan people take seaweed eating seriously; as much as 4 kilograms is eaten per person per year!
Seaweeds are algae and they have unique health and nutritional properties. Algae use sunlight to photosynthesise food for themselves but they are far simpler in structure than most land plants.