Silver shiner, <i>Notropis photogenis</i>, fecundity and parasite infections during the reproductive period

The reproductive period is a critical part of species’ life history. Estimating species-specific fecundity can improve demographic models aimed at developing recovery targets for imperilled species. We provide egg diameter and estimates develop length–fecundity relationship silver shiner, Notropis photogenis (Cope, 1865), small-bodied freshwater species listed as Threatened under Canada's Species Risk Act. Furthermore, we document the incidence an acanthocephalan parasite, thorny-headed worm, Leptorhynchoides thecatus (Linton, 1891), in gastrointestinal tract which first published record parasite this Silver shiner diameters (mean ± standard deviation) were 0.61 0.15 mm ranged from 0.13 to 0.92 mm. Fecundity 311 2768 eggs was significantly higher age 2–3+ fish (1475 570 eggs) compared with 1+ (576 270 eggs). highlight that infection negatively impacted body condition individuals additional work needed determine impact infestation on output, recruitment, susceptibility predation, survival Canada. Canadian provided here be incorporated into future populations modelling threatened