Table 1. Natural food fluctuations (% of total food intake) of different size classes of rainbow trout (Oncorhynchus mykiss).
Type of food	Life stage/ size class*
	Larvae	Fry	Fingerling	Juvenile	Grower	Broodstock
Invertebrates		100	100	85	75	60
Fish				15	25	40
Data source: McPhail and Lindsey (1970)
*Approximate indicative weight of different size classes of rainbow trout: fry, 0.3�1.0 g; fingerlings, 1.0�25.0 g, grower, 25�1 500 g; adult >1 500 g.