Table 5.
Growth, feed conversion ratio, biometric traits and visual scoring of external and internal traits of Atlantic salmon fed a low fishmeal diet (FM group), or the same diet with fishmeal partly substituted by krill meal (KM group), during the finishing feeding period of 90 d before harvesting*
(Mean values with their standard errors)
| FM | KM | P | |||
|---|---|---|---|---|---|
| Mean | se | Mean | se | ||
| Body weight (g) | 3833 | 37 | 3923 | 43 | 0·08 |
| TGC | 3·88 | 0·03 | 3·92 | 0·13 | 0·41 |
| FCR | 1·06 | 0·02 | 1·07 | 0·03 | 0·36 |
| Mortality (%) | 1·0 | 0·4 | 1·3 | 0·6 | 0·72 |
| Biometric traits | |||||
| Condition factor | 1·41 | 0·01 | 1·44 | 0·01 | 0·05 |
| Slaughter yield (%) | 87·8 | 0·3 | 88·0 | 0·7 | 0·51 |
| Fillet yield (%) | 66·3 | 0·3 | 66·9 | 0·2 | 0·06 |
| Hepatosomatic index (%) | 1·11 | 0·02 | 1·12 | 0·01 | 0·50 |
| Cardio somatic index (%) | 0·14 | 0·003 | 0·13 | 0·003 | 0·77 |
| Visual scoring | |||||
| Wounds | 0·4 | 0·1 | 0·3 | 0·1 | 0·88 |
| Eye lens opacity | 0·19 | 0·11 | 0·03 | 0·02 | 0·09 |
| Visceral fat | 3·4 | 0·1 | 3·4 | 0·1 | 0·68 |
| Fat on heart surface | 0·7 | 0·1 | 0·4 | 0·1 | 0·03 |
| Liver darkness | 2·9 | 0·1 | 3·7 | 0·1 | <0·0001 |
| Number of dark stained myomera | 0·9 | 0·2 | 0·5 | 0·2 | 0·13 |
TGC, thermal growth coefficient; FCR, feed conversion ratio.
*
Results on body weight, TGC, FCR and mortality are based on registrations of all fish in each of the four sea cages per diet (100 fish per cage initially). For the other traits, n 20 randomly selected fish per sea cage (n 80 per diet).