Catch-per-unit-effort is often used as an approximation of population size. However, for the management and conservation of populations, information about the number of individuals is fundamental. Pike, Esox lucius, is a popular fish species for recreational anglers. In this study, data in the form of journal keeping by anglers were used: date; place; and photographs of the captured fish; pike were identified based on their natural markings in combination with length measurements. The data were analysed by spatial capture-recapture (SCR) models. Results showed that a small and densely vegetated lake (6.7 ha) in south-eastern Sweden had a population size of 91 (+/- 22 SE) pike >= 60 cm. On one occasion, 10 individuals were caught, that is 11.1% of the population, highlighting that angling may potentially have a substantial impact on the population size. Hopefully, this study can inspire angler-manager collaborations for conservation of fish stocks.