Ecology Summary - Salmo trutta

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Main Ref.	Muus, B.J. and P. Dahlström, 1967
Remarks	Brown trout are territorial and begin establishing territories as juveniles (Ref. 26526). Juvenile trout from lake populations move from their natal inlets to lakes during the first 2 years of life (Ref. 6390). For sympatric populations of this species and Gadopsis marmoratus, coexistence was possible, although their diets were similar, because each species occupied different habitats (Ref. 26860). Juveniles feed mainly on larvae of insects; adults feed on crustaceans and fish (Ref. 51442). Fingerling brown trout seems to act as an opportunistic predator, and the consumption of different preys seems to be influenced by their accessibility, predation risk, and their energetic value (Ref. 55756). It is preyed upon by kingfishers and mergansers.

Main Ref.

Muus, B.J. and P. Dahlström, 1967

Remarks

Brown trout are territorial and begin establishing territories as juveniles (Ref. 26526). Juvenile trout from lake populations move from their natal inlets to lakes during the first 2 years of life (Ref. 6390). For sympatric populations of this species and Gadopsis marmoratus, coexistence was possible, although their diets were similar, because each species occupied different habitats (Ref. 26860). Juveniles feed mainly on larvae of insects; adults feed on crustaceans and fish (Ref. 51442). Fingerling brown trout seems to act as an opportunistic predator, and the consumption of different preys seems to be influenced by their accessibility, predation risk, and their energetic value (Ref. 55756). It is preyed upon by kingfishers and mergansers.

Aquatic zones / Water bodies

	Marine - Neritic	Marine - Oceanic	Brackishwater	Freshwater
Marine zones / Brackish and freshwater bodies	supra-littoral zone littoral zone sublittoral zone	epipelagic mesopelagic epipelagic abyssopelagic hadopelagic	estuaries/lagoons/brackish seas mangroves marshes/swamps	rivers/streams lakes/ponds caves exclusively in caves

Highighted items on the list are where Salmo trutta may be found.

Habitat

Substrate	: rocky;
Substrate Ref.
Special habitats
Special habitats Ref.

Associations

Ref.
Associations
Associated with
Association remarks	Parasites of the species include Echinorhynchus lateralis, Apophallus brevis, Crepidostomum farionis, Metabronema salvelini, Eubothrium salvelini, Discocotyle salmonis, Dibothriocephalus sp., Trichophyra piscium, Ergasilus and Bacterium salmonicida (causes furunculosis) (Ref. 5951).
Parasitism

Feeding

Feeding type	mainly animals (troph. 2.8 and up)
Feeding type Ref.	Muus, B.J. and P. Dahlström, 1967
Feeding habit	hunting macrofauna (predator)
Feeding habit Ref.	Muus, B.J. and P. Dahlström, 1967

Trophic Level(s)

Estimation method	Original sample		Unfished population		Remark
Estimation method	Troph	s.e.	Troph	s.e.	Remark
From diet composition	3.36	0.10			Troph of adults from 11 studies.
From individual food items	3.80	0.82			Trophic level estimated from a number of food items using a randomized resampling routine.
Ref.	Nilsson, N.-A., 1957

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