Etude expérimentale de Tincubation des oeufs de Baetis rhodani Pictet

The eggs of Baetis rhodani were collected from natural conditions just after laying and incubated at different constant temperatures (from 7-5°C to 27-5°C) with a constant photoperiod. The incubation period was shorter at higher temperatures up to 25°C (8 days); above this eggs no longer hatched. The slowest development (determined by extrapolation) was at about 3°C (theoretically 130 days). The hatching period was always very short (about 3-5 days). Fewer eggs hatched at higher temperatures.