Table 10. Recommended levels (as fed basis) of different alternative protein sources tested for mrigal under laboratory/field conditions
Protein source	Recommended level (%)	Size class
Soybean meal	40	Fry
Maize gluten	5	Fingerling
Brewery waste (Brewer's grains)�	>30	Fingerling
Water hyacinth	25-35	Juvenile
(Duck-lettuce) Ottelia alismoides leaf meal	30-50	Fry
Nymphoides indicum leaf meal	30-50	Fry
Spirulina powder	10	Fry
Fish silage*/fish silage**	75
Fermented silk worm pupae silage	13.4	Fingerling
	(wet silage)
*Prepared with 30% sulphuric acid; **prepared with 90% formic acid
Data source: Jose et al. (2006); Kaur and Saxena (2004); Kaur and Saxena (2005);
Patnaik et al. (1989); Patnaik et al. (1991); Ayyappan et al. (1991); Ali et al. (1994);
Rangacharyulu et al. (2003)