How Big Are Aquatic Insects?

How Big Are Aquatic Insect Larva ?
How long do aquatic insects live?

The chart below gives a visual representation of the relative sizes of several aquatic insect larva that are important in fly fishing. The table indicates the longest a member of the insect family would be expected to be found. To "translate" the lengths shown in millimeters into inches, conversion is one millimeter equals .0394 inches . . . or, a millimeter is roughly .04 or 4% of an inch.

These are insect larval forms . . . for adult forms, go to the Adult Size Comparison chart. For a side-by-side comparison, see Relative Size Chart.

Home / For a comparative view of the sizes, see "Relative Size Chart"