Tetraselmis Phytoplankton

Tetraselmis is known to be an excellent source of lipids, amino acids and the Omega-3 fatty acids DHA and EPA which can promote high growth rates as well as serving as a kind of marine animal appetite stimulant.

It is a good source of vitamin C and E, has loads of color-enhancing xanthophyll carotenoids. 

It has also been shown to produce substances that act like antibiotics that increase survival in larval fish; as such, there is at least some likelihood that they play a similar role in disease resistance for other creatures that feed on them.