Pentti Valkeajärvi

TL;DR: In this paper, a 200 kHz digital echosounder with two split-beam transducers was aimed horizontally to monitor the upstream migration activity of fish, from 24 April to 28 June, in Aijalansalmi channel (mean width 35 m, length 700 m, and maximum depth 5 m).

TL;DR: Significant positive correlation between lakes in the variation of abundance of young-of-the-year recruits, residuals of a density dependence model for recruitment, newly hatched larvae and spawning stocks is detected.

TL;DR: Vendace accommodate strong population fluctuations by their high plasticity in growth and fecundity, which affect their offspring size and consequently their recruitment and productivity, and account for their persistence and resilience in the face of high fishing mortality.

TL;DR: It is suggested that predation pressure as a whole was an important factor for the onset and duration of the vendace recession in lake Konnevesi.

TL;DR: A postal inquire addressed to Finnish commercial inland fishers examined whether existing property rights institutions’ and fishers’ harvesting policies were appropriate to establish interlocked use of multiple vendace stocks, finding almost half of fishers had, to some extent, reaped benefit from a fishing strategy that included small-scale mobility, which is consistent with the proposed strategy.