Partial Replacement of Fishmeal with Duckweed (Spirodela polyrhiza) in Feed for Two Carnivorous Fish Species, Eurasian Perch (Perca fluviatilis) and Rainbow Trout (Oncorhynchus mykiss)

Table 3

Feed formulation for perch fry and feed proximate composition (g·kg⁻¹ DM).

	Control	DWD12	DWD24	DWD35	DWF12	DWF24	DWF35
Fish meal	400.0	352.0	304.0	260.0	352.0	304.0	260.0
PBM	319.8	319.8	319.8	319.8	319.8	319.8	319.8
DWD	0.0	89.8	179.6	261.9	0.0	0.0	0.0
DWF	0.0	0.0	0.0	0.0	114.3	228.5	333.3
Potato starch	147.0	115.0	80.0	50.0	95.0	45.0	0.9
α-cellulose	45.9	35.2	27.6	18.5	32.0	16.2	0.0
Fish oil	67.4	68.2	69.1	69.9	66.9	66.5	66.1
Vitamin premix	10.0	10.0	10.0	10.0	10.0	10.0	10.0
Mineral premix	10.0	10.0	10.0	10.0	10.0	10.0	10.0
Proximate composition
Dry matter (%)	92.0	92.8	93.4	93.6	91.9	92.5	92.9
Crude protein (% DM)	52.8	52.7	52.9	53.0	53.1	53.4	53.5
Crude lipids (% DM)	14.1	13.6	14.0	13.9	13.8	14.1	14.3
Crude ash (% DM)	12.5	13.0	13.7	14.3	13.1	13.1	13.3
Crude fiber (% DM)	2.93	3.34	2.89	3.31	3.26	3.24	3.12
NFE (% DM)	17.6	17.3	16.5	15.5	16.8	16.2	15.7

PBM: poultry by-product meal; NFE: nitrogen free extract (100–CP–CL–CA–CF).