Ecology of Salmo trutta
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.


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


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).


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
Troph s.e. Troph s.e.
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
(e.g. 346)
(e.g. cnidaria)
Entered by Luna, Susan M. on 06.07.91
Modified by Pablico, Grace Tolentino on 07.31.07
Checked by Miranda, Lilibeth on 05.10.01
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