During summer 1999, 5,004 landlocked alewives (Alosa pseudoharengus) were captured from 12 Connecticut lakes using horizontal gill nets with mesh sizes of 9.5, 12.7, 15.9, 19.1, 25.4, and 31.8 mm (bar measure). The most effective mesh size was 12.7-mm, capturing 3,035 alewives. The modal length of alewives caught in each mesh size increased as the mesh size increased from 9.5 to 25.4 mm. No alewives less than 70 mm total length or greater than 245 mm were captured. Modal lengths of selectivity curves estimated indirectly using the Holt model were 85, 114, 143, 172, and 228 mm for the 9.5-, 12.7–15.9-, 19. 1-, and 25.4-mm mesh sizes, respectively. Adding a 22.3-mm mesh and removing the 31.8-mm mesh is suggested to sample landlocked alewives between 100 and 245 mm in Connecticut lakes.