Ogle, 1998



Citation


Ogle, D.H. (1998) A synopsis of the biology and life history of ruffe. Journal of Great Lakes Research [J. Great Lakes Res.], pp. 170-185

Associated characteristics


Species Development state Trait Primary Data Secondary Data
Gymnocephalus cernuus Spawning conditions Parental care Non-guarding No care
Gymnocephalus cernuus Spawning conditions Spawning substrate Spawn on occurs on a variety of substrates : open-substrate, phytolithophil, submerged plants, logs, branches, or gravel or rocks but also hard bottoms, sand, clay, or gravel Ambiguous
Gymnocephalus cernuus Spawning conditions Spawning temperature 6-18 12.0 °C
Gymnocephalus cernuus Spawning conditions Spawning depth Shallow waters, usually less than 3 meters 3.0 m
Gymnocephalus cernuus Female Maximum GSI value 7.1-15.6 [Average spawning GSI] 11.35 percent
Gymnocephalus cernuus Egg Egg adhesiveness Ruffle eggs become adhesive upon contact with water and stick to substrate Adhesive
Gymnocephalus cernuus Egg Incubation time 5-12 [At 10-15°C] 8.5 days
Gymnocephalus cernuus Female Relative fecundity 352-1540 946.0 thousand eggs/kg
Gymnocephalus cernuus Male Maximum GSI value 7-10 [Average spawning male GSI] 8.5 percent
Gymnocephalus cernuus Female Age at sexual maturity 2-3 but sometimes 1 [Sex not specified] 2.5 years
Gymnocephalus cernuus Egg Temperature for incubation "15 is the optima temperature for ""early development"" [Lower TL50 = 10, Upper TL50 = 21.5]" 15.0 °C
Gymnocephalus cernuus Female Onset of oogenesis Oocytes mature in 165 days in winter and 30 days during summer ['March', 'January', 'September', 'August', 'July', 'February']
Gymnocephalus cernuus Female Oocyte development A mature ruffe ovary contains three types of eggs: 1) small, hyaline, and clorless, 2) larger, opaque, white and orange in color, and 3) large, partly hyaline, and yellow-orange and ornage in color. Only the latter two types will be released during the next spawing season No category
Gymnocephalus cernuus Egg Oocyte diameter 0.34-1.3 (first batch : 0.90-1.21 and second batch 0.36-0.47) 0.82 mm
Gymnocephalus cernuus Female Absolute fecundity 4-200 for the first batch and 0.352-6 for the second 102.0 thousand eggs
Gymnocephalus cernuus Spawning conditions Spawning season Mid-April to July ['April', 'July']
Gymnocephalus cernuus Larvae Temperature during larval development 25-30 optimal temperature for larval growth, larval survival is poor below 10°C [Possibly between 7.0°C to 24.8°C] 27.5 °C
Gymnocephalus cernuus Larvae Reaction to light Positively phototactic, little or no pelagic stage Photopositive
Gymnocephalus cernuus Female Length at sexual maturity 11-12 [Sex not specified] 11.5 cm
Gymnocephalus cernuus Larvae Onset of exogeneous feeding The transition to exogenous feeding takes plance in benthopelagic layer about 1 week after hatching 1.0 °C * day
Gymnocephalus cernuus Male Length at sexual maturity 11-12 [Sex not specified] 11.5 cm
Gymnocephalus cernuus Larvae Initial larval size 3.5-4.4 3.95 mm
Gymnocephalus cernuus Larvae Larvae behaviour Embryo remains sedentary on the bottom for 3 to 7 days until reaching a size of 4.5-5.0 Demersal
Gymnocephalus cernuus Female Age at sexual maturity 2-3 but sometimes 1 [Sex not specified] 2.5 year
Gymnocephalus cernuus Spawning conditions Spawning release "Ruffle eggs are extruded in ""strands"" ? Never observed anywhere else" No category
Gymnocephalus cernuus Spawning conditions Parity Female ruffe may reach age 11, but male ruffe generally do not exceed age 7 No category