Age  group   Mean
number
    Back calculated weights in (g)
 1     2    3      4    5    6
    I   34 12.21
   II   41 13.04 30.32
  III   61 16.24 37.61 81.83
I V   36 15.61 38.89 72.91  105.16
  V   33 13.48 42.66 83.47  112.89  138.51
VI   12 13.26 38.66 77.89  114.76  143.00 169.37
Average total 217 13.97 37.63 79.03  110.94  140.76 169.37
Increment of weight   13.97 23.66 41.40 31.91  29.82  28.61
Table 4: Calculated weights of female Siganus rivulatus from the Bitter lakes, Egypt.