Long-Term Changes in the Growth of Muksun Coregonus muksun in the Ob River

In the long-term (from 2000 to 2020), there has been a decrease in the growth rate of muksun in the Ob River. These changes occur against the background of a population decline and are unnatural and associated with long-term highly selective fishing and climate warming. As a result of climate warming, the feeding conditions of the muksun have worsened and competition from other more thermophilic species has increased. Prolonged intensive and highly selective fishing is the main negative factor that has led to a change in the population size/age structure. In general, the changes are in the direction of stunting and a further decrease in reproductive capacities of muksun specimens and productivity indicators of its population.