Table 2. The nitrogen and crude protein content of some commonly cultured species of fish. Values calculated using linear regression equations in Ramseyer, L. J.  (2000)   Whole fish weight as an accurate predictor of whole fish nitrogen content:  in review

	Atlantic salmon		Channel catfish		Common carp		Milkfish		Mozambique tilapia
Fish weight (g)	N (g)	Protein (g)	N (g)	Protein (g)	N (g)	Protein (g)	N (g)	Protein (g)	N (g)	Protein (g)
1	0.0214	0.134	0.0191	0.119	0.0204	0.128	0.0263	0.164	0.0224	0.140
25	0.628	3.92	0.578	3.61	0.562	3.51	0.658	4.11	0.679	4.24
50	1.30	8.12	1.20	7.53	1.15	7.17	1.32	8.22	1.42	8.85
75	1.99	12.4	1.85	11.6	1.74	10.9	1.97	12.3	2.18	13.6
100	2.69	16.8	2.51	15.7	2.34	14.7	2.63	16.4	2.95	18.4
125	3.40	21.3	3.18	19.9	2.95	18.4	3.29	20.5	3.74	23.4
150	4.12	25.7	3.86	24.1	3.56	22.2	3.95	24.7	4.54	28.3
175	4.84	30.3	4.55	28.4	4.17	26.1	4.60	28.8	5.34	33.4
200	5.57	34.8	5.24	32.7	4.79	29.9	5.26	32.9	6.15	38.5
250	7.04	44.0	6.63	41.5	6.02	37.6
300	8.53	53.3	8.05	50.3	7.27	45.4
350	10.0	62.7	9.48	59.2	8.52	53.2
400	11.5	72.1	10.9	68.2	9.78	61.1
450	13.1	81.6	12.4	77.3	11.0	69.0
500	14.6	91.2	13.8	86.5	12.3	76.9
550	16.1	101	15.3	95.6	13.6	84.8
600	17.7	110	16.8	105	14.8	92.8
650	19.2	120	18.3	114	16.1	101
700	20.8	130	19.8	124	17.4	109
750	22.3	140	21.3	133	18.7	117
800	23.9	149	22.8	142	20.0	125
850	25.5	159	24.3	152	21.2	133
900	27.0	169	25.8	161	22.5	141
950	28.6	179	27.3	171	23.8	149
1000	30.2	189	28.8	180	25.1	157
1050	31.8	199	30.4	190	26.4	165
1100	33.4	209	31.9	199	27.7	173
1150	35.0	219	33.4	209	29.0	181
1200	36.6	229	35.0	219	30.3	189
1250	38.2	239	36.5	228	31.6	198
1300	39.8	249	38.1	238	32.9	206
1350	41.4	259	39.6	248	34.2	214
1400	43.0	269	41.2	257	35.5	222
1450	44.6	279	42.8	267	36.8	230
1500	46.2	289	44.3	277
1550	47.8	299	45.9	287
1600	49.5	309	47.5	297
1650	51.1	319
1700	52.7	329
1750	54.3	340
1800	56.0	350
1850	57.6	360
1900	59.3	370
1950	60.9	381
2000	62.5	391
2050	64.2	401
2100	65.8	411
2150	67.5	422
2200	69.1	432
2250	70.8	442
2300	72.4	453
2350	74.1	463
2400	75.7	473
2450	77.4	484
2500	79.0	494
2550	80.7	504
2600	82.4	515
2650	84.0	525
2700	85.7	536
2750	87.4	546
2800	89.0	556
2850	90.7	567
2900	92.4	577
2950	94.0	588
3000	95.7	598
3050	97.4	609
3100	99.1	619
3150	101	630
3200	102	640
3250	104	651
3300	106	661
3350	107	672
3400	109	682
3450	111	693
3500	113	703
3550	114	714
3600	116	724
3650	118	735
3700	119	746
3750	121	756
3800	123	767
3850	124	777
3900	126	788
3950	128	799
4000	129	809