Manual on the production and use of live food in aquaculture.
FAO Technical Paper No. 361
Silicate is specifically used for the growth of diatoms which utilize this compound for production of an external shell. Micronutrients consist of various trace metals and the vitamins thiamin (B1), cyanocobalamin (B12) and sometimes biotin. Two enrichment media that have been used extensively and are suitable for the growth of most algae are the Walne medium (Table 2.3.) and the Guillard's F/2 medium (Table 2.4.). Various specific recipes for algal culture media are described by Vonshak (1986). Commercially available nutrient solutions may reduce preparation labour. The complexity and cost of the above culture media often excludes their use for large-scale culture operations.
Nualgi is the solution to the use of Walne medium or Guillard's F/2 medium.
Its commercially available and is economical and easy to use even in large ponds and lakes.