Month   Jan. Feb. Mar. Apr. May June July Aug. Sept. Oct. Nov. Dec.
No.Of fishes 7 15 12 9 18 20 21 16 13 10 10 9
Marginal increment (mmX40) 0.054 0.054 0.054 0.012 0.017 0.021 0.030 0.039 0.048 0.050 0.051 0.052
Table 2: Monthly variations of marginal increment of the abdominal vertebrae of B. docmac of age (III).