Ecology Summary - Rhinichthys obtusus

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Main Ref.	Stewart, K.W. and D.A. Watkinson, 2004
Remarks	Prefers current: may be associated with lower water velocities but mostly moderately fast channel habitats (15-50 cm/sec), 2.5-5 meter depth, gravel to rubble substrate in Manitoba Escarpment streams, Less common in large rivers and along the shorelines of lakes; on sand, and in water usually less than 1 meter deep. A benthic-feeding predator of aquatic insect larvae; plant material may comprise up to 25% of the diet, fish eggs are taken as well (Ref. 54726).

Main Ref.

Stewart, K.W. and D.A. Watkinson, 2004

Remarks

Prefers current: may be associated with lower water velocities but mostly moderately fast channel habitats (15-50 cm/sec), 2.5-5 meter depth, gravel to rubble substrate in Manitoba Escarpment streams, Less common in large rivers and along the shorelines of lakes; on sand, and in water usually less than 1 meter deep. A benthic-feeding predator of aquatic insect larvae; plant material may comprise up to 25% of the diet, fish eggs are taken as well (Ref. 54726).

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 Rhinichthys obtusus may be found.

Habitat

Substrate
Substrate Ref.
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.
Feeding habit
Feeding habit Ref.

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	3.13	0.37			Trophic level estimated from a number of food items using a randomized resampling routine.
Ref.

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