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 5

Essential amino acids in the different perch diets (% DM).

	Control	DWD12	DWD24	DWD35	DWF12	DWF24	DWF35	Req
Arginine	3.18	3.11	3.36	3.06	3.35	3.08	2.96	1.8
Histidine	1.04	1.02	1.06	1.00	1.11	1.05	1.02
Leucine	3.24	3.17	3.44	3.21	3.45	3.37	3.27
Isoleucine	1.81	1.75	1.88	1.76	1.90	1.85	1.78
Lysine	3.89	3.73	3.74	3.47	3.65	3.50	3.19	2.2
Methionine	0.91	0.84	0.83	0.75	0.91	0.84	0.84	0.8
Phenylalanine + tyrosine	2.79	2.73	2.83	2.73	2.95	2.97	2.92
Threonine	1.75	1.70	1.89	1.68	1.82	1.72	1.66	1.2
Valine	2.32	2.27	2.49	2.31	2.49	2.41	2.34
Sum	20.93	20.32	21.52	19.97	21.63	20.79	19.98

Bold numbers indicate values below the required level according to the National Research Council for European sea-bass (Dicentrarchus labrax) (rightmost column). Requirements for Eurasian perch are not published.