Brown, 1998


No detailed citation.

Associated characteristics

Species Development state Trait Primary Data Secondary Data
Gymnocephalus cernuus Spawning conditions Spawning temperature 5-18 [mainly between 12-14] 11.5 °C
Gymnocephalus cernuus Spawning conditions Spawning period duration 8 8.0 weeks
Gymnocephalus cernuus Female Maximum GSI value 9-11 [May] 10.0 percent
Gymnocephalus cernuus Egg Incubation time 5-6 [At 16°C] 5.5 days
Gymnocephalus cernuus Egg Degree-days for incubation About 90 [5-6 days at 16°C] 5.5 °C * day
Gymnocephalus cernuus Egg Temperature for incubation 16°C 16.0 °C
Gymnocephalus cernuus Spawning conditions Spawning season May-July ['May', 'July', 'June']
Gymnocephalus cernuus Larvae Temperature during larval development Larvae were captured at Allouez Bay from 30 May to 10 July, with peak catch the week of 13 June, corresponds to a temperature of 12-17°C on the graph. Larvae were captured at whaleback from 23 May to 3 June with a peak catch the week of 30 May, which corresponds to 12-16°c on the graph 14.5 °C
Gymnocephalus cernuus Larvae Onset of exogeneous feeding 120-130: Active feeding and swim-up occurring 13 days after fertilization (hatching 5-6 days after fertilization) at 16°C 125.0 °C * day
Gymnocephalus cernuus Larvae Larvae behaviour Larval ruffe hatch and become pelagic within 1 to 2 weeks after egg deposition and could possibly be netrained in ballast water duting the pelagic period Pelagic
Gymnocephalus cernuus Spawning conditions Parity The prolonged spawning period is possibly due to different rates of development of the ovaries among females of different ages No category