Plankton Culture for Feeding Larval Fish. Introduction. You’ve got larval fish!! Good job!! Now what?? If you’ve researched then it shouldn’t be a big deal, because you’re ready to feed those little critters!
Species Protein Fat Carb Ash
Chaetoceros muelleri 35 30 20 15
Pavlora virdis 60 16 16 8
Tetraselmus tetratheie 30 5 27 38
Isochrysis galbana 46 22 22 10
Species EPA % Total n-3 FA %
Nannochloropsisoculata 30.5 42.7
Pavloralutheir 13.8 23.5
Skeletonemacostatum 13.8 15.5
Isochrysisgalbana 3.5 22.5
Isochrysisaffgalbana 0.5 3.3
produces 10 tons of protein
(wheat only gets you 0.16 tons)
--BOTTOM LINE, IT’S GOOD STUFF!!
Ct = C0 x emt
Cell division slows down when nutrients, light, pH, carbon dioxide or other physical and chemical factors begin to limit growth.
4. Stationary phase
In the fourth stage the limiting factor and the growth rate are balanced, which results in a relatively constant cell density.
5. Death or “crash” phase
During the final stage, water quality deteriorates and nutrients are depleted to a level incapable of sustaining growth. Cell density decreases rapidly and the culture eventually collapses.
Nutrient depletion Oxygen deficiency
Overheating pH disturbance
All of the above
Table 2.6. Advantages and disadvantages of various algal culture techniques.
Carboy culture apparatus
Turbidostat culture: Algal concentration (cell density) is kept at a preset level by diluting the culture with fresh medium by means of an automatic system.
Chemostat culture: Fresh medium is introduced
into the culture at a steady, predetermined rate.
Addition of a limiting vital nutrient (e.g. nitrate) at
a fixed rate is also required. This way the growth
rate and not the cell density is kept constant.