Exploring sensitivities to hydropeaking in Atlantic salmon parr using individual‐based modelling

Hydropeaking (the release of water pulses at hydropower plants) results in temporary reductions river channel water-covered area downstream, which may cause fish mortality through stranding. We used a mechanistic modelling approach to examine how both the form hydropeaking cycle and characteristics affected control stranding fish. modelled response Atlantic parr regulated watercourse central Norway River Nidelva) using an individual-based population model designed explicitly behaviour during hydropeaking. A hydropeaking, involving migration from riverbanks towards mid-channel on down-ramping return up-ramping, was based individuals being parameterized migrate habitat properties that spatially changed throughout cycle. found strongly dependent response. Total more speed than duration minimum flow period. greatest when there low movement speed, leading stranded, combined with high probability dying per unit time stranded. Given sensitivity lack detailed field studies quantifying this, we conclude this requires further controlled for parameterizing models predict effects Simulation-based modelling, where is 100% knowledge characteristics, range deterministic functions can be evaluated boundary conditions easily controlled, useful research tool complement empirical studies.