The first type is the Nannochloropsis oculata #phytoplankton.
Nannochloropsis oculata is a 2-4 micron green flagellate. This is a fast growing species that is easy to maintain. This phytoplankton is the one most commonly thought of when the term green-water is used.
This is a dark green alga with a thick tough cell wall that interestingly is readily consumed by #rotifers. N. Oculata is high in overall omega-3 HUFAs (ranging from 16-42%), and while most of the HUFAs are composed of EPA, there is little DHA present.
A growth study has been determined that the highest level of EPA was attained at 7 days after batch cultures were inoculated. N. oculata has been shown to contain very high levels of vitamin B12, which is critical for larval fish survival, and it has also been suggested that vitamin B12 is important for developing diseases resistance in larval fish as well.
Isochrysis galbana is a 4-7 golden-brown flagellate. This species is commonly used in bivalve culture (clams, oysters, etc). While it has been occasionally used as a single rotifer food, it is usually mixed with other phytoplankton such as chlorella or N. ocultus. The EPA levels range from 2-3.5% and DHA is 3.5-4%.
Different strains of this species have varying levels of HUFAs, and one isolate found off Tahiti (commonly known as T-Iso) contains high DHA (8-11%) and low EPA (0.2-0.7%).
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