Determining head capsule width of the mayflies Deleatidium spp. from labia lengths (note)

Abstract

A method is described that enables determination of the head capsule width of Deleatidium spp., from labia length measurements only. This method has proven useful for gut analysis of recently emerged chinook salmon (Oncorhynchus tsawytscha) of fork length 29–34 mm.

Keywords:

• diet
• salmon
• Deleatidium
• labium length
• head capsule width
• food size
• prey width