Ecology Summary - Thyrsites atun

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Main Ref.	O'Driscoll, R.L., 1998
Remarks	This fish is a facultative schooling species (Ref. 26865). Schools are most common in surface waters of the continental shelf in 13°C and 18°C. (Ref. 6390). In Australia and New Zealand, juveniles inhabit sheltered waters of southern bays and estuaries (Ref. 26998, 27128). The migration patterns in Australian barracouta are complex. Some stocks undertake annual migrations lasting 6-9 months that cover several hundred kilometers (Ref. 28893). The migrations appear to be related to water temperature or food availability, or a combination of both factors (Ref. 6390). Barracouta also move through the water column from depths of 200 m to the surface, where they are usually caught at dawn and at dusk (Ref. 28893).

Main Ref.

O'Driscoll, R.L., 1998

Remarks

This fish is a facultative schooling species (Ref. 26865). Schools are most common in surface waters of the continental shelf in 13°C and 18°C. (Ref. 6390). In Australia and New Zealand, juveniles inhabit sheltered waters of southern bays and estuaries (Ref. 26998, 27128). The migration patterns in Australian barracouta are complex. Some stocks undertake annual migrations lasting 6-9 months that cover several hundred kilometers (Ref. 28893). The migrations appear to be related to water temperature or food availability, or a combination of both factors (Ref. 6390). Barracouta also move through the water column from depths of 200 m to the surface, where they are usually caught at dawn and at dusk (Ref. 28893).

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 Thyrsites atun 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.	O'Driscoll, R.L., 1998
Feeding habit	hunting macrofauna (predator)
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	3.63	0.26	3.72	0.58	Troph of adults from 3 studies.
From individual food items	4.19	0.68			Trophic level estimated from a number of food items using a randomized resampling routine.
Ref.	O'Driscoll, R.L., 1998

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