Ecology of Entosphenus tridentatus
Main Ref. Farmer, J.G., 1980
Remarks Spawning adults are found in gravel riffles and runs of clear coastal streams; feeding adults usually in the ocean, but landlocked populations occur (Ref. 1998); ammocoetes in silt, mud, and sand of shallow eddies and backwaters of streams (Ref. 5723). Some individuals may spend up to 42 mo. in saltwater before returning to freshwater (Ref. 12479).

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 Entosphenus tridentatus may be found.


Substrate Hard Bottom: rocky;
Substrate Ref. Scott, W.B. and E.J. Crossman, 1973
Special habitats
Special habitats Ref.


Ref. Scott, W.B. and E.J. Crossman, 1973
Associations parasitism;
Associated with Fishes: Oncorhynchus gorbuscha, O. kisutch, O. mykiss, O. nerka, O. tshawytscha, Gadus macrocephalus, Theragra chalcogramma, Merluccius productus, Ophiodon elongatus, Anoplopoma fimbria
Association remarks As an external parasite, it feeds on the blood and body fluids of fish and other marine invertebrates. Attaches to the side or undersurface of fishes by means of the suctorial disc and disc teeth. The toothed tongue rasps through scales and skin, and the fluids are consumed (Ref. 1998).
Parasitism outside host


Feeding type mainly animals (troph. 2.8 and up)
Feeding type Ref. Farmer, J.G., 1980
Feeding habit feeding on a host (parasite)
Feeding habit Ref.
Trophic Level(s)
Estimation method Original sample Unfished population Remark
Troph s.e. Troph s.e.
From diet composition
From individual food items 4.50 0.80 Trophic level estimated from a number of food items using a randomized resampling routine.
(e.g. 346)
(e.g. cnidaria)
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