Frantzen et al, 1997


Citation

Frantzen, M. and Johnsen, H.K. and Mayer, I. (1997) Gonadal development and sex stroids in a female arctic charr broodstock. Journal of fish biology, pp. 697-709

Associated characteristics

Species Development state Trait Primary Data Secondary Data
Oncorhynchus mykiss Female Oocyte development Group-synchronous Group-synchronous
Salvelinus alpinus Female Oocyte development Group-synchronous Group-synchronous
Salvelinus alpinus Female Onset of oogenesis March [Although onset of vitellogenesis occurred as early as March, there was apprently no change in oocyte size and only a modest rise in GSI until early June.] ['March', 'June']
Salvelinus alpinus Female Intensifying oogenesis activity The period with the most intensive vitellogenesis occurred in late July ['July']
Salvelinus alpinus Female Maximum GSI value 18.2 [15 October] 18.2 percent
Salvelinus alpinus Female Oogenesis duration First histological signs of maturation were seen in March, 6-7 months prior ovulation, but onset of viteelogeneis apparently occurred over several moths between March and June. Although onset of viteelogenesis occurred as early as March, there was apprently no change in oocyte size and only a modest rise in GSI until early June. 6.5 months
Salvelinus alpinus Female Resting period Recruitement of stage II and stage III oocyes was seen 1-2 months after ovulation had occurred, and by February the next year all the post-ovulatory follicles had disappeared 1.5 months
Salvelinus alpinus Female Resting period < 0.5% (November to beginning of June) 3.0 months
Salvelinus alpinus Spawning conditions Spawning season Ripening females were first observed on 24 September and by 15 October all the sampled females had ovulated ['September', 'October']
Salvelinus alpinus Spawning conditions Spawning period duration 3 [The ovulatory period may have no more than 3 weeks] 3.0 weeks
Salvelinus fontinalis Female Oocyte development Group-synchronous Group-synchronous