Table 2.
Mean data for the nutrient composition of by-product samples (head, gills, intestines, trimmings, bones, skin) of meagre and gilthead sea bream fishes in two different size classes (large and small).
| By-Product Nutrient Composition | |||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Meagre | (g/100 g) * | Head | Gills | Intestines | Trimmings | Bones | Skin | ||||||||||||||||||
| Large | Small | Large | Small | Large | Small | Large | Small | Large | Small | Large | Small | ||||||||||||||
| Mean | SD | Mean | SD | Mean | SD | Mean | SD | Mean | SD | Mean | SD | Mean | SD | Mean | SD | Mean | SD | Mean | SD | Mean | SD | Mean | SD | ||
| Moisture | 64.0 | 0.5 | 68.9 | 0.7 | 68.3 | 0.2 | 74.3 | 0.4 | 73.0 | 0.2 | 59.2 | 0.4 | 63.1 | 0.7 | 57.0 | 0.1 | 63.2 | 0.7 | 40.6 | 0.2 | 58.4 | 0.3 | 65.3 | 0.2 | |
| Ash | 20.95 | 0.37 | 21.27 | 1.04 | 15.59 | 0.98 | 19.18 | 0.32 | 4.77 | 0.08 | 2.25 | 0.05 | 49.12 | 1.91 | 48.51 | 2.55 | 21.00 | 0.58 | 23.30 | 1.23 | 20.24 | 0.53 | 15.23 | 1.06 | |
| Protein | 40.41 | 0.16 | 47.50 | 1.25 | 45.62 | 0.16 | 48.46 | 0.32 | 59.62 | 0.08 | 29.79 | 0.64 | 45.87 | 0.91 | 45.98 | 1.92 | 32.07 | 0.25 | 36.41 | 0.13 | 75.16 | 1.87 | 75.15 | 0.03 | |
| Fat | 28.88 | 1.60 | 23.34 | 0.74 | 19.71 | 1.33 | 21.31 | 0.45 | 17.09 | 0.19 | 54.05 | 4.94 | 3.00 | 1.50 | 4.35 | 0.69 | 34.96 | 0.10 | 31.07 | 2.10 | 6.12 | 0.42 | 9.61 | 1.60 | |
| Carbohydrates | 9.76 | 1.65 | 7.89 | 1.78 | 19.08 | 1.66 | 11.05 | 0.63 | 18.52 | 0.22 | 13.91 | 4.98 | 2.01 | 2.59 | 1.16 | 3.27 | 11.97 | 0.64 | 9.22 | 2.44 | 1.01 | 0.01 | 0.99 | 0.01 | |
| Gilthead Sea Bream | (g/100 g) * | Head | Gills | Intestines | Trimmings | Bones | Head | ||||||||||||||||||
| Large | Small | Large | Small | Large | Small | Large | Small | Large | Small | Large | Small | ||||||||||||||
| Mean | SD | Mean | SD | Mean | SD | Mean | SD | Mean | SD | Mean | SD | Mean | SD | Mean | SD | Mean | SD | Mean | SD | Mean | SD | Mean | SD | ||
| Moisture | 57.3 | 0.7 | 62.4 | 0.2 | 66.6 | 0.3 | 62.9 | 0.8 | 67.1 | 1.0 | 57.15 | 0.5 | 48.6 | 0.1 | 53.1 | 0.2 | 53.3 | 0.7 | 74.5 | 0.8 | 53.0 | 0.5 | 61.2 | 0.1 | |
| Ash | 18.11 | 1.24 | 21.39 | 1.33 | 16.60 | 0.40 | 17.49 | 0.30 | 3.57 | 0.06 | 2.62 | 0.07 | 45.76 | 2.29 | 47.26 | 0.73 | 26.62 | 0.10 | 27.70 | 0.58 | 6.02 | 0.17 | 4.36 | 0.17 | |
| Protein | 32.40 | 0.45 | 37.19 | 0.67 | 31.49 | 0.42 | 38.50 | 1.47 | 37.23 | 0.75 | 26.87 | 0.35 | 41.85 | 1.00 | 45.10 | 2.30 | 34.02 | 0.98 | 40.74 | 1.57 | 43.16 | 0.89 | 49.67 | 0.11 | |
| Fat | 37.08 | 4.19 | 28.76 | 0.47 | 37.46 | 1.16 | 26.69 | 0.23 | 43.19 | 0.35 | 55.12 | 0.98 | 5.45 | 0.09 | 4.09 | 0.33 | 30.56 | 0.11 | 21.47 | 0.54 | 46.39 | 3.45 | 45.94 | 0.54 | |
| Carbohydrates | 12.41 | 4.39 | 12.66 | 1.56 | 14.45 | 1.30 | 17.32 | 1.52 | 16.01 | 0.83 | 15.39 | 1.04 | 6.94 | 2.50 | 3.55 | 2.44 | 8.80 | 0.99 | 10.09 | 1.75 | 4.43 | 3.56 | 0.03 | 0.02 | |
* ash, protein, fat, and carbohydrate contents are expressed on a dry weight basis; carbohydrates were calculated by difference; no statistically significant differences were observed between the different by-products, either between fish species or size classes.