Overview

Comprehensive Description

Biology

These fish are hardy, peaceful toward other species and highly intelligent. They are microfeeders and not carnivorous. In the wild, they often stay in deep water and never come to the surface to feed. They never swim in midwater but are typical rock-dwellers. Ventures into the open but never far from the rock cover. Breeds in crevices and caves (Ref. 6770). Monogamous pairs are most common (Ref. 54944).
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Distribution

Range Description

Endemic to Lake Tanganyika. Distributed in the northwestern part of lake. Has three races, one is found below the shallow habitat of Julidochromis dickfeldi around cape Chipimbi, also in the south, and posses a much more elongate body than the usual type of marlieri found in the north. Another geographic race has been found on the western shores.
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Africa: Endemic to the northwestern part of Lake Tanganyika.
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Eastern Africa: Lake Tanganyika.
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Physical Description

Size

Maximum size: 130 mm TL
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Max. size

13.0 cm TL (male/unsexed; (Ref. 5651))
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
J. merlieri do venture into the open, but never far from the rock cover. Breed in crevices and caves. The behaviour of the fry is not standardized. Sometimes they are spread outside of the cave as soon as they are 15 mm long. When threatened, they do not hide in the nearby breeding cave but flee along the boulder wall. At other times the fry remain inside of the cave and apparently do not venture out until they are much larger.

Systems
  • Freshwater
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Environment

demersal; freshwater; pH range: 7.5 - 9.0; dH range: 12, usually 3 - 9 m (Ref. 54894)
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Life History and Behavior

Life Cycle

The same study (Ref. 54894) claims that polyandry aside from monogamy is also demonstrated by this species because of some observations in the nesting area where a female occupies 2 territories each with a male. This idea of an expanded mating system for J. marlieri was initially suggested by Yamagishi and Kohda (1996). However, monogamous pairs are most common (Ref. 54944). Males guard the nest against attacks by cichlid and non-cichlid predators alike (Ref. 54944).
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
LC
Least Concern

Red List Criteria

Version
3.1

Year Assessed
2006

Assessor/s
Bigirimana, C.

Reviewer/s
Snoeks, J. (Freshwater Fish Red List Authority) & Darwall, W. (Freshwater Biodiversity Assessment Programme)

Contributor/s

Justification
Widespread species in Lake Tanganyika with no major widespread threats identified.
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Population

Population
The population size is not known, thought to be rare.

Population Trend
Unknown
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Threats

Major Threats
Water pollution; sedimentation; land agriculture around the lake; fishing activities; over exploitation for aquarium trade – since its first exportation in 1971 it has reached worldwide popularity among aquarists.
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Least Concern (LC)
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Management

Conservation Actions

Conservation Actions
There are no conservation measures in place for this species.
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Relevance to Humans and Ecosystems

Benefits

Importance

aquarium: commercial
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Wikipedia

Julidochromis marlieri

Julidochromis marlieri is a species of cichlid endemic to Lake Tanganyika where it is only known from the northwestern portion preferring rocky areas in deep waters. In the aquarium trade, it is commonly known as Marlier's Julie or Spotted Julie. This species reaches a length of 13 centimetres (5.1 in) TL.[2]

See also

References

  1. ^ Bigirimana, C. 2006. Julidochromis marlieri. In: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.2. <www.iucnredlist.org>. Downloaded on 20 April 2013.
  2. ^ Froese, Rainer, and Daniel Pauly, eds. (2013). "Julidochromis marlieri" in FishBase. February 2013 version.
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