Leino and McCormick, 1997



Citation


Leino and McCormick, J.H. (1997) Reproductive characteristics of the ruffe, Gymnocephalus cernuus, in the St. Louis River estuary on western Lake superior: a histological examination of the ovaries over one cycle. Can. J. Fish. Aquat. Sci., pp. 256-263

Associated characteristics


Species Development state Trait Primary Data Secondary Data
Gymnocephalus cernuus Spawning conditions Spawning period duration 8 8.0 weeks
Gymnocephalus cernuus Spawning conditions Spawning depth Most spawning occurs at a depth of less than 1 m 1.0 m
Gymnocephalus cernuus Female Maximum GSI value 8-11 [April] 9.5 percent
Gymnocephalus cernuus Female Resting period 2-3 [June, July and August] 2.5 months
Gymnocephalus cernuus Female Onset of oogenesis September slight increase ['September']
Gymnocephalus cernuus Female Intensifying oogenesis activity March-April ['April', 'March']
Gymnocephalus cernuus Female Oocyte development Group- synchronous, multiple clutches [ovaries may contain several oocytes stages simultaneously] Synchronous
Gymnocephalus cernuus Spawning conditions Spawning season Late April to Mid-June ['April', 'June']
Gymnocephalus cernuus Spawning conditions Spawning release More than one clutches of eggs per spawning season, intermittent spawner Fractional