Portable Field Egg Candler

Abstract

An egg candler has been developed for detecting cracked shells, blood spots on the yolk or in the albumen, yolk shape, and inconsistencies on individual eggs. The radiant energy of the light output covers the wavelengths from 470 to 750 nm with the maximum output at 570 nm. The egg candler is light weight. It is now used for monitoring the implementation of egg standards by inspectors of Agriculture Canada in checking the performance of egg grading stations. (

A photographic guide for determining egg incubation stage in the Superb Fairy-wren (Malurus cyaneus)

“…Amazona amazonica), current methods of candling eggs for determining incubation stage for species used in field research are less well established. (Brach et al, 1982;Delany et al, 1999;Hanson and Kossack 1957;Weller 1956) Here, we present a photographic guide for assessing embryo development using candling methods in the Superb Fairy-wren (Malurus cyaneus), a species that is the focus of several long-term population monitoring studies (Boersma et al, 2023;Cockburn et al, 2016;Colombelli-Négrel et al, 2022;Feeney et al, 2013;Mulder and Magrath, 1994;Peters et al, 2002) but, for which, no such resource has been published. Additionally, we outline a method that we developed to candle passerine eggs using readily available materials that can be easily modified for use in other species.…”