Wisniewolski, 1988


Wisniewolski, W. (1988) Fecundity of catfish (Silurus glanis L.) from the rivers Vistula and Bug. Acta Ichthyologica et Piscatoria [ACTA ICHTHYOL. PISC.], pp. 25-34

Associated characteristics

Species Development state Trait Primary Data Secondary Data
Carassius auratus Female Absolute fecundity 48-60 [in April] and 38-54 [In June] 54.0 thousand eggs
Carassius carassius Female Absolute fecundity 22-24 23.0 thousand eggs
Silurus glanis Egg Oocyte diameter Oocytes attain final size of 2-3 2.5 mm
Silurus glanis Female Absolute fecundity Number of the yellow oocytes in particular females amounted to from 34.7 thousand in a female weghting 5.3 kg to 788.0 thousand in a female weighting 36.0 kg [Described in other study : 38592-306240; 11810-1380000; 27400-384500; 42822-391411; 356400; 14600-285000; 61400-249300] 172416.0 thousand eggs
Silurus glanis Female Oocyte development Two groups of the oocytes were present in all samples [Also described as: asynchronic development of the oocytes was observed in catfish as late as 10 days before spawning] Asynchronous
Silurus glanis Female Onset of oogenesis The peak of vitellogenesis was observed in summer (July-August), and females passed winter with the ovaries in the IV th stage of development ['January', 'February', 'March', 'July', 'August', 'September']
Silurus glanis Female Intensifying oogenesis activity Supplementary vitellogenesis took place in spring ['April', 'May', 'June']
Silurus glanis Spawning conditions Spawning season In Dagestan (USSR) catfish spawn at the end of May, but in Polish conditions in mid-june ['May']