The length-frequency distribution of 428 T. galilaea captured from August 1960 to October 1972 in nine different mesh sizes is recorded in Table 7. Modal lengths of fish for each mesh are as follows:
| Stretched mesh size, inches | Modal midpoint, S.L., mm |
| 1½ | 70 |
| 2 | 100 |
| 2½ | 130 |
| 3. | 140–150 |
| 3½ | 170 |
| 4 | 200, 270 |
| 5 | 220, 270 |
| 6 | 270 |
| 7 | 310, 270 |
The modal distribution shows a reasonably regular increase from fish 70 mm long in the 11/2-inch mesh to fish 310 mm in the 7-inch mesh. A secondary mode of fish at about 270 mm is present in the 4, 5, and 7-inch mesh. The origin of this group is not clear, but in the 4 and 5 inch mesh represents fish caught in 1972 while in the 7-inch mesh they were mainly caught in 1971.
Mesh selectivity for T. galilaea in Kainji Lake is essentially similar to that in Volta Lake (Figure 6).
The lengths of 314 T. galilaea measured from castnet catches of four different mesh sizes from September 1972 to February 1973 are found in Table 7. Modal lengths for each mesh are:
| Stretched mesh size, inches | Modal midpoint, S.L., mm |
| 1½ | 90 |
| 2½ | 120 |
| 3 | 150 |
| 5 | 300, 240 |
The sizes of fish caught in castnet meshes are similar to but not exactly the same as corresponding meshes of gillnet. While castnet fishing is selective in that the fishermen often actively pursue their prey the data indicates that control of castnet mesh size used could certainly influence the size of T. galilaea harvested.
