Czeniejewski and Filipiak, 2002



Citation


Czeniejewski, P. and Filipiak, J. (2002) Fecundity assessment of vendace, Coregonus albula L. from six lakes in polish western pomerania. Acta Ichthyologica et Piscatoria [ACTA ICHTHYOL. PISC.], pp. 71-82

Associated characteristics


Species Development state Trait Primary Data Secondary Data
Coregonus albula Female Maximum GSI value For example in vendace females occurring in brackish waters of the Gulf of Bothnia it fits 10-12%, whereas in neighbouring lakes Keitele and Pyhajarvi it is 23.9% and 19.3%, respectively. In Polish bodies of water the values of GSI are also very variable. In Lakes of West Pomerania (Bucerz, Krzemien, and Kalensko) te size of gonds constitued between 14.63 and 23.16% of the body weight of vendace. Even wider range was determined for Masurian Lakes Dargin, Dobskie, and Kisajno. The mean values of the gonadosomatic index of vendace from lakes of West Pomerania fitted into the above range, however, few specimens from lakes Pile and Pelcz showed low values of gonadosomatic index (GSI < 10%), whereas in a single vendace female from Morynskie Lake the value of the above parameter amounted to more than 30% of the fish body weight 11.0 percent
Coregonus albula Female Age at sexual maturity Depending on environmental conditions in lakes, females of this species are able to breed, most often, in their second year of life, whereas the males- in third. A number of researchers stated that in some cold bodies of water of north-eastern Europe of vendace mature as late as in the third year of their lives and in the case of Siberian vendace- at the age of 4+. In polish lakes, because of the thermal conditions of waters, the vendace is ready for reproduction as early as the age of 1+. It has been confirmed in the present study, carried out in lakes of Western Pomerania. On the spawning ground, however, dominate 3-year-old fish of much higher fecundity than that of 1+ vendace. 4.0 years
Coregonus albula Female Absolute fecundity The values of absolute fecundity in vendace from different lakes of western Pomerania show substantial variability. Vendace of lakes Komorze and Drawsko show the highest absolute fecundity (7.21-16.85 103 and 6.9-22.23 103 of eggs), whereas the lowest fecundity can be attributed to vendace of Pelcz Lake (2.61-4.12* 103) 12.03 thousand eggs
Coregonus albula Female Age at sexual maturity Depending on environmental conditions in lakes, females of this species are able to breed, most often, in their second year of life, whereas the males- in third. A number of researchers stated that in some cold bodies of water of north-eastern Europe of vendace mature as late as in the third year of their lives and in the case of Siberian vendace- at the age of 4+. In polish lakes, because of the thermal conditions of waters, the vendace is ready for reproduction as early as the age of 1+. It has been confirmed in the present study, carried out in lakes of Western Pomerania. On the spawning ground, however, dominate 3-year-old fish of much higher fecundity than that of 1+ vendace. 4.0 year