Fuller, 1976



Citation


No detailed citation.

Associated characteristics


Species Development state Trait Primary Data Secondary Data
Coregonus lavaretus Spawning conditions Parental care Individual females migrate to the spawning-grounds as ovulation takes place, spawn, and return to deep water No category
Coregonus lavaretus Spawning conditions Spawning substrate Gravel banks Lithophils
Coregonus lavaretus Spawning conditions Spawning period duration Spawning takes place during the first 3 weeks of January in Loch Lomond, Scotland 3.0 weeks
Coregonus lavaretus Female Maximum GSI value Mean of 16%, up to 21% [In December] 16.0 percent
Coregonus lavaretus Male Onset of spermatogenesis July ['July']
Coregonus lavaretus Male Maximum GSI value Mean of 2%, up to 2.5% [In September until January, with no significant change during this period] 2.0 percent
Coregonus lavaretus Female Resting period After spawning, the gonadosomatic ratio of females fell suddenly and remained low, about 1% of body weight, for 6 months until July[From March to May ovaries contained only primary (pre-vitellogenic) oocytes. Secondary oocytes, wihc chorion and yolkk precursors, appeared in May] 1.0 months
Coregonus lavaretus Male Main spermatogenesis activity August and September ['August', 'September']
Coregonus lavaretus Female Onset of oogenesis July ['July']
Coregonus lavaretus Female Intensifying oogenesis activity Mainly September-October [From July until December there was a progressive increase] ['October', 'December', 'July', 'September']
Coregonus lavaretus Spawning conditions Spawning migration period During the first 2-3 weeks of January, ripe males migrated to the spawning grounds, where they remained until the end of the spawning period ['January']
Coregonus lavaretus Male Resting period It fell gradually from January to a minimum of 0.4% in June and July 0.4 months
Coregonus lavaretus Spawning conditions Spawning season Spawning takes place during the first 3 weeks of January in Loch Lomond, Scotland ['January']