Single mesh selectivity curve Matched two contiguously mesh size, 4.5 via 5.5 and 5.5 via 6.5 cm, for computing the Lc separately. In each pair: Selectivity curves were constructed using the expected values. Summed up the expected value of selection and constructed the common selection curve as the representative. The X-intercept of the linear regression equation from the method of Holt (1963) was the ‘common’ Lc. Selection factor was also estimated.