Factors Level N Mean Yield (%) Tukey Grouping
Parts Whole fish 36 60.17 A
Head 36 60.73 B
Frame 36 61.02 B
FTSG 36 56.03 C
0.5 48 54.40 A
Enzyme Concentration (%) 1.0 48 58.76 B
  2.0 48 65.30 C
Hydrolysis time (h) 1 36 50.73 A
2 36 57.81 B
3 36 62.78 C
4 36 66.63 D
Groups with the same letter are not significantly different from each other at the 0.05 level. FTSG = Fin, tail, skin and gut
Table 5: Tukey's grouping on protein yield.