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High enough flow needed to re-distribute young fish. Sustained low flow may lead to high fish density and greater competition, predation, spread of diseases and territorial aggression.
Types of salmon fishing in Scotland
Salmon fishing in Scotland falls into three main categories:
Rod and line fishing: this takes place within rivers by recreational anglers1Marine Scotland. (2019).
Retrieved from <a href="https://www2.gov.scot/Topics/marine/marine-environment/species/fish/freshwater/eel" target="_blank">https://www2.gov.scot/Topics/marine/marine-environment/species/fish/freshwater/eel</a> [accessed 18 June 2019] Fishing for eels is now illegal without a license under the Freshwater Fish Conservation (Prohibition on Fishing for Eels) (Scotland) Regulations 20086The Freshwater Fish Conservation (Prohibition on Fishing for Eels) (Scotland) Regulations 2008. (2008).
Retrieved from <a href="https://www.sfca.co.uk/go-fishing/know-your-fish/ruffe/" target="_blank">https://www.sfca.co.uk/go-fishing/know-your-fish/ruffe/</a> [accessed 26 June 2019] but there appears to be little research on ...
Step 1: Converting rod catch to numbers of returning adult salmon
A basic model is created to calculate what percentage of salmon which are caught by anglers. On rivers which have fish counters (automatic devices measuring the number of fish passing along a river), the number of fish counted can be compared to the number of fish caught by anglers further upstream.
Other fish
Outgoing smolts reaching the marine phase of their migration may be predated on by other fish including returning adult salmon, cod, saithe, sea trout and eels1Cairns, D.K. (2016).
A review of the potential effects of suspended sediment on fishes: potential dredging-related physiological, behavioral, and transgenerational implications.
However, these catches should be viewed alongside net fishing effort (below) as the amount of fishing will be largely driven by the amount of fishing which takes place.