Le Cren, 1951


Le Cren, E.D. (1951) The length-weight relationship and seasonal cycle in gonad weight and condition in the perch (Perca fluviatilis). J. Anim. Ecol., pp. 201-219

Associated characteristics

Species Development state Trait Primary Data Secondary Data
Perca fluviatilis Female Onset of oogenesis August and then increase proceeds regulalry through the winter and spring till the spawing time in May ['January', 'February', 'March', 'April', 'May', 'June', 'August']
Perca fluviatilis Female Maximum GSI value About 20% [Prior to spawning, in May] 20.0 percent
Perca fluviatilis Female Resting period Mid-summer 4.0 months
Perca fluviatilis Male Onset of spermatogenesis August ['August']
Perca fluviatilis Male Main spermatogenesis activity September-October, then remain at this size during winter until spring ['January', 'February', 'March', 'April', 'May', 'June', 'September', 'October']
Perca fluviatilis Male Maximum GSI value About 8% [October] 8.0 percent
Perca fluviatilis Male Spermatogenesis duration About 6 weeks 6.0 months
Perca fluviatilis Male Resting period < 1% [June, July, and most of August] 1.0 months