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 4

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

	Control	DWD12	DWD24	DWD35	DWF12	DWF24	DWF35
Fish meal	350.0	308.0	266.0	227.5	308.0	266.0	227.5
Wheat gluten	321.2	321.2	321.2	321.2	321.2	321.2	321.2
DWD	0	75.6	151.2	220.6	0	0	0
DWF	0	0	0	0	85.2	170.4	248.5
Wheat flour	77.0	77.0	77.0	77.0	77.0	77.0	77.0
α-cellulose	126.1	91.1	56.1	23.9	82.9	39.7	0
Sunflower oil	105.6	107.1	108.5	109.8	105.7	105.7	105.7
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 (%)	95.1	94.4	94.2	93.5	94.7	94.3	94.6
Crude protein (% DM)	52.7	52.8	52.9	52.8	52.9	53.2	53.1
Crude lipids (% DM)	16.0	15.5	15.7	16.0	15.6	15.7	16.2
Crude ash (% DM)	9.57	10.1	10.6	11.1	9.61	9.86	10.0
Crude fiber (% DM)	8.52	6.67	5.31	3.64	6.65	4.35	2.33
NFE (% DM)	13.2	15.0	15.5	16.4	15.2	16.9	18.4

NFE: nitrogen free extract (100–CP–CL–CA–CF).