Bagenal, 1970


Bagenal, T.B. (1970) Notes on the biology of the schelly Coregonus lavaretus (L.) in Haweswater and Ullswater. J. Fish Biol., pp. 137-154

Associated characteristics

Species Development state Trait Primary Data Secondary Data
Coregonus lavaretus Egg Egg size after water-hardening 2.98 mean diameter of fertilized egg 2.98 mm
Coregonus lavaretus Egg Egg adhesiveness Slightly adhesive and stick to each other Adhesive
Coregonus lavaretus Egg Incubation time 45-125 [340 degree days [At 2.7°C], 420 [4.9°C] and 363 [7.9°C]] 85.0 days
Coregonus lavaretus Egg Temperature for incubation 4-6 [Total mortality occurred at 10°C, and a very high mortality prior to, and during hatching in those at about 8°C] 5.0 °C
Coregonus lavaretus Egg Degree-days for incubation 340 [At 2.7], 420 [4.9°C] and 363 [7.9°C] 340.0 °C * day
Coregonus lavaretus Female Age at sexual maturity 4 [Female] 4.0 year
Coregonus lavaretus Female Length at sexual maturity 27.9 27.9 cm
Coregonus lavaretus Female Weight at sexual maturity 0.207 0.21 kg
Coregonus lavaretus Male Age at sexual maturity 3 [Male] 3.0 years
Coregonus lavaretus Male Length at sexual maturity About 24.0 24.0 cm
Coregonus lavaretus Male Weight at sexual maturity About 0.127 0.13 kg
Coregonus lavaretus Spawning conditions Spawning season From 15 th January to 15 February ['January', 'February']
Coregonus lavaretus Spawning conditions Spawning period duration 4 [From 15 January to 15 February] 4.0 weeks
Coregonus lavaretus Spawning conditions Spawning depth Less than 7.6 m 7.6 m
Coregonus lavaretus Spawning conditions Spawning substrate The bottom was found to consist of a witish clay covered by a layer of sand. There were a few scattered stones and patches covered with a growth Fontinalis antipyretica [Schelly eggs were found round the stones, on the sand and more plentifully on and amongst the weed] Phytophils