Ecology Summary - Harttia kronei

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Main Ref.	Buck, S. and I. Sazima, 1995
Remarks	Inhabits streams with rocky and sandy bottom, in shallow and deeper (up to 0.7 m) areas with water flow up to 70 cm/sec. Forages at night, although occasional diurnal activity is also recorded. Grazes on microscopic algae, mostly diatoms and green algae growing on rugged and light-colored rocks, and submersed vegetation. Chironomid and simuliid larvae, as well as tiny crustaceans, are recorded in its diet. Before grazing on a patch with dense sediment, the fish makes wiggling head-down movements, which raise sediment and blown away by the water current. When scraping algae off the substrate, the fish makes vigorous mouth movements and jerky movements probably related to its mouth making alternate grazing and attaching to the substrate. Density may reach about 0.1 fish/m2 both in shaded and sunned stream stretches (Ref. 26630).

Main Ref.

Buck, S. and I. Sazima, 1995

Remarks

Inhabits streams with rocky and sandy bottom, in shallow and deeper (up to 0.7 m) areas with water flow up to 70 cm/sec. Forages at night, although occasional diurnal activity is also recorded. Grazes on microscopic algae, mostly diatoms and green algae growing on rugged and light-colored rocks, and submersed vegetation. Chironomid and simuliid larvae, as well as tiny crustaceans, are recorded in its diet. Before grazing on a patch with dense sediment, the fish makes wiggling head-down movements, which raise sediment and blown away by the water current. When scraping algae off the substrate, the fish makes vigorous mouth movements and jerky movements probably related to its mouth making alternate grazing and attaching to the substrate. Density may reach about 0.1 fish/m2 both in shaded and sunned stream stretches (Ref. 26630).

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 Harttia kronei may be found.

Habitat

Substrate
Substrate Ref.
Special habitats
Special habitats Ref.

Associations

Ref.
Associations
Associated with
Association remarks
Parasitism

Feeding

Feeding type	plants/detritus+animals (troph. 2.2-2.79)
Feeding type Ref.	Buck, S. and I. Sazima, 1995
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	2.21	0.13			Trophic level estimated from a number of food items using a randomized resampling routine.
Ref.

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Aquatic zones / Water bodies

Habitat

Associations

Feeding