Peranan pakan hidup di dalam produksi benih ikan

THE IMPORTANCE OF LIFE FOOD ORGANISMS IN SEED PRODUCTION OFFISH. The mass production of zooplankton, in particular the rotifer, Brachionus plicatilis, and the brine shrimp, Artemia salina, is considered to be a vital importance for the rearing of larval fish. Data on the essential fatty acid (EFA) contents of live food organisms are reviewed: the EFA content chiefly determines the dietary value for fish larvae. The EFA content of rotifers supplied with yeast during the culture period was less favourable for larval fish growth than that of rotifers given marine Chlorella. The nutritional value of yeast-fed rotifers may be improved by the use of the developed ωyeast (indirect method). Artemia could be classified into two types, marine containing a high content of 20:5 ω 3 (an EFA for marine fish), and fresh water-containing a high content of 18:3 ω 3 (an EFA for fresh water fish). The fish mortalities sometimes encountered with Artemia may be related to this difference. Both types can be used for fresh water fish larval nutrition. For marine fish, the marine Artemia type is adequate but the fresh water type should be fed together with marine copepods or should be enriched by feeding on lipids with high ω 3 HUFA contents.