Features of reproduction of whitefishes
- 1 June 2011
- journal article
- Published by Pleiades Publishing Ltd in Journal of Ichthyology
- Vol. 51 (6), 432-456
- https://doi.org/10.1134/s0032945211030118
Abstract
Based on features of reproduction, whitefishes (Coregonidae) differ from salmonids (Salmonidae) and graylings (Thymallidae). They differ from other salmonid fishes (Salmoniformes) in the following characteristics: they spawn, as a rule, during fall and winter; they do not construct spawning redds; their eggs are not protected; and substantial egg mortality is compensated by a high fecundity. The eggs of several whitefish species can develop in the conditions of “pagon” (within the ice). The main reasons for egg mortality at riverine spawning grounds are as follows: abnormalities during fertilization and development of the embryo, predation on the eggs, parasitic deceases, freezing of spawning grounds, and drift of the eggs from the spawning grounds. In addition (in the lakes), egg mortality can be caused by a deficit of oxygen, siltation, acidulation, and pollution of water. The survival of eggs of whitefishes in the Ural tributaries of the Lower Ob River in different years ranges from 0 to 93%. At a stable environment, the age of sexual maturation is connected with a certain body size of the fish. In the northern water bodies, the cycle of gonadal development can reach more than 1 year. Pollution of water by heavy metals, oil, and toxicants leads to serious anomalies of the reproductive system and to decreasing reproductive potential of the stocks.Keywords
This publication has 4 references indexed in Scilit:
- Comparison of Meristic and Morphometric Characters among Spring- and Fall-Spawning Ecotypes of Cisco (Coregonus artedii) in Southern Quebec, CanadaCanadian Journal of Fisheries and Aquatic Sciences, 1989
- Conditions écophysiologiques de la survie dans la glace des oeufs de corégones du lac BaïkalBulletin Français de Pisciculture, 1977
- Effects of Eutrophication on Salmonid Communities in Oligotrophic LakesJournal of the Fisheries Research Board of Canada, 1972
- Survival of Some Central Texas Frogs under Natural ConditionsIchthyology & Herpetology, 1956