Overview

Comprehensive Description

Biology

Found in shelter of rocks and boulders in lacustrine habitats, also found in swamps and streams draining in and out of lakes (Ref. 44894). Adults occur in the rocky margin of Clarence Lagoon, its outlet stream and several tributaries that flow into the lake. Adults feed on benthic crustaceans while juveniles feed partly on planktonic crustaceans, and insects and their larvae (Ref. 30189, 44894). Very secretive species, darts for cover under boulders if disturbed. The entire life cycle (may live for up to four years) takes place in fresh water. Adults move into inlet streams to spawn in spring. The demersal eggs take about 2 months to hatch. Fry reside in open surface waters of the lake (Ref. 44894).
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Distribution

Oceania: known only in Clarence Lagoon and tributaries and the upper reaches of the Clarence River, which is part of the Derwent River system of Tasmania, Australia.
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Australia.
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Physical Description

Morphology

Dorsal spines (total): 0; Dorsal soft rays (total): 10 - 12; Analspines: 0; Analsoft rays: 11 - 13; Vertebrae: 53 - 54
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Size

Maximum size: 90 mm SL
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Max. size

14.0 cm SL (male/unsexed; (Ref. 44894)); max. published weight: 20.0 g (Ref. 30189)
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Diagnostic Description

Scales completely absent (Ref. 30189). Dark brown dorsal surface, irregular dark brown bars and bands extending down sides, ventral surface yellow-cream in color (Ref. 30189).
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Ecology

Habitat

Habitat and Ecology

Systems
  • Freshwater
  • Marine
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Environment

demersal; catadromous (Ref. 51243); freshwater
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Migration

Catadromous. Migrating from freshwater to the sea to spawn, e.g., European eels. Subdivision of diadromous. Migrations should be cyclical and predictable and cover more than 100 km.
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Trophic Strategy

Occurs in the rocky margin of Clarence Lagoon, its outlet stream and several tributaries that flow into the lake. Feeds partly on insects and their larvae.
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Life History and Behavior

Life Cycle

Oviparous. Spawn in spring (Ref. 30189).
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
CR
Critically Endangered

Red List Criteria
A1c, B1+2a

Version
2.3

Year Assessed
1996
  • Needs updating

Assessor/s
Wager, R.

Reviewer/s

Contributor/s

History
  • 1994
    Endangered
    (Groombridge 1994)
  • 1990
    Endangered
    (IUCN 1990)
  • 1988
    Endangered
    (IUCN Conservation Monitoring Centre 1988)
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Threats

Critically Endangered (CR) (A1c, B1+2a)
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Wikipedia

Clarence galaxias

The Clarence galaxias (Galaxias johnstoni) is a species of fish in the Galaxiidae family. It is endemic to Australia.

Names[edit source | edit]

The scientific name for this species is the Galaxis Johnstoni, and the common name in English for this species is Clarence Galaxias.[1]

Threats[edit source | edit]

The threats that affect the Clarence galaxias include the following:

  • Introduced brown and rainbow trout
  • Spread of trout by illegal introductions
  • Spread of trout in the upper Derwent catchment[2]

Size[edit source | edit]

The average length of an unsexed male is about 14 centimeters. [3]

Habitat[edit source | edit]

The Clarence galaxias can be found in a freshwater and marine environment. It is known to be in a climate that is temperate. Their habitat lies under rocks and boulders located in swamps and streams that are connected to lakes. [3]

Location[edit source | edit]

The Clarence galaxias is native to the areas including:

  • Clarence Lagoon
  • Clarence River
  • Derwent River system
  • Tasmania, Australia[3]

References[edit source | edit]

  1. ^ "Galaxias johnstoni". International Union for Conservation of Nature and Natural Resources. Retrieved 9 February 2013. 
  2. ^ "Clarence galaxias - Galaxias johnstoni". Australian Society for Fish Biology. Retrieved 9 February 2013. 
  3. ^ a b c "Galaxias johnstoni". Fish Base. Retrieved 9 February 2013. 

Source[edit source | edit]

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