Ecology Summary - Cottus cognatus

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Main Ref.	Scott, W.B. and E.J. Crossman, 1973
Remarks	Inhabits rocky riffles of cold streams, rocky areas of lakes (commonly at 90-106 m depth), springs and their effluents (Ref. 5723). Occurs in rocky reefs, prefering rock substrate for protection from common predators (Ref. 46644). Moves into shallow water to spawn (Ref. 27547). In some areas, they are common in brackish water (Ref. 27843), presumably moving to and from fresh water, at least for spawning (Ref. 27547). Feeds mostly on aquatic insect larvae and nymphs but also on crustaceans, small fishes, and plant materials (Ref. 1998).

Main Ref.

Scott, W.B. and E.J. Crossman, 1973

Remarks

Inhabits rocky riffles of cold streams, rocky areas of lakes (commonly at 90-106 m depth), springs and their effluents (Ref. 5723). Occurs in rocky reefs, prefering rock substrate for protection from common predators (Ref. 46644). Moves into shallow water to spawn (Ref. 27547). In some areas, they are common in brackish water (Ref. 27843), presumably moving to and from fresh water, at least for spawning (Ref. 27547). Feeds mostly on aquatic insect larvae and nymphs but also on crustaceans, small fishes, and plant materials (Ref. 1998).

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 Cottus cognatus may be found.

Habitat

Substrate	Hard Bottom: rocky;
Substrate Ref.	Page, L.M. and B.M. Burr, 1991
Special habitats
Special habitats Ref.

Associations

Ref.
Associations
Associated with
Association remarks
Parasitism

Feeding

Feeding type	mainly animals (troph. 2.8 and up)
Feeding type Ref.	Scott, W.B. and E.J. Crossman, 1973
Feeding habit	hunting macrofauna (predator)
Feeding habit Ref.	Scott, W.B. and E.J. Crossman, 1973

Trophic Level(s)

Estimation method	Original sample		Unfished population		Remark
Estimation method	Troph	s.e.	Troph	s.e.	Remark
From diet composition
From individual food items	3.37	0.47			Trophic level estimated from a number of food items using a randomized resampling routine.
Ref.

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