Table 6.
Serum chemistry and histopathology of Atlantic salmon fed a low- fishmeal diet (FM group), or the same diet with fishmeal partly substituted by krill meal (KM group)
(Mean values with their standard errors; n 4 sea cages/diet, five fish per sea cage)
| FM | KM | P | |||
|---|---|---|---|---|---|
| Mean | se | Mean | se | ||
| Serum chemistry | |||||
| Na (mmol/l) | 159·3 | 1·1 | 160 | 1·3 | 0·84 |
| Chloride (mmol/l) | 131·2 | 1·4 | 132·5 | 1·4 | 0·86 |
| Ca (mmol/l) | 3·2 | 0·03 | 3·1 | 0·12 | 0·90 |
| K (mmol/l) | 0·6 | 0·02 | 0·8 | 0·16 | 0·44 |
| Total protein (g/l) | 49·3 | 1·4 | 48·5 | 2·2 | 0·70 |
| Glucose (mmol/l) | 5·0 | 0·03 | 5·3 | 0·31 | 0·10 |
| Creatinine (µmol/l) | 15·7 | 0·5 | 15·5 | 0·9 | 0·81 |
| Alanine aminotransferase (U/l) | 12·5 | 3·5 | 13·3 | 2·5 | 0·74 |
| Histopathological scores (0–3)* | |||||
| Heart | 0·5 | 0·1 | 0·5 | 0·1 | 0·76 |
| Spleen | 0·0 | 0·0 | 0·0 | 0·0 | – |
| Liver | 0·1 | 0·1 | 0·4 | 0·1 | 0·07 |
| Skeletal muscle | 0·1 | 0·1 | 0·0 | 0·0 | 0·32 |
| Skin | 0·0 | 0·0 | 0·0 | 0·0 | – |
| Thyroidea | 1·8 | 0·1 | 1·8 | 0·1 | 0·68 |
| Hindgut | 0·7 | 0·2 | 0·7 | 0·2 | 0·78 |
*
Score 0: no pathological changes; score 1: mild changes; score 2: moderate pathological changes; score 3: severe pathological changes.