Unknown
Environment Agency North West
In:
dis@fba.org.uk
|
http://aquaticcommons.org/id/eprint/8086
|
1256
|
2012-03-01 17:32:32
|
8086
|
Environment Agency, UK (Freshwater Biological Association)
Publication Date:
2021-06-29
Description:
This report discusses the concepts of spawning targets. Spawning target setting is based on the fact that the number of smolts produced by any given river is constrained by habitat availability. This means smolt numbers depend on spawner numbers up to a point, but thereafter smolt production reaches a ceiling. It has been shown, in some rivers at least, that the relationship between egg deposition and smolt production may approximately be described by a mathematical equation. The equation will vary between rivers and there is uncertainty over its exact form. The concept of Maximum Gain (MG) is explained and its application in fisheries management discussed. The author also critically examines the concept of Density Independent Mortality (DIM).
Description:
Environment Agency Archives North West
Description:
No date on publication. Date given is estimation. Environment Agency internal report, includes "Response to Dr Milner's targets"
Keywords:
Ecology
;
Fisheries
;
Limnology
;
Salmo salar
;
Salmo trutta
;
Salmon fisheries
;
River fisheries
;
Spawning populations
;
Spawning
;
Fishery management
;
Smolts
;
Stock assessment
;
Stocks
Repository Name:
AquaDocs
Type:
monograph
Format:
application/pdf
Format:
application/pdf
Format:
23
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