Overview

Comprehensive Description

Biology

Feeds on worms, insects and crustaceans. In aquaria, female lays up to 1000 eggs, after vigorous driving by the male, which hatch in 30 to 34 hours (Ref. 7020). Aquarium keeping: in groups of 5 or more individuals; minimum aquarium size 100 cm (Ref. 51150).
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Distribution

Range Description

This species is endemic to Nigeria where it is restricted to the lower Ogun to lower Niger rivers.
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Africa: lower Niger and Ogun rivers in Nigeria (Ref. 2880, 81279).
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Africa.
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Physical Description

Morphology

Anal spines: 0; Analsoft rays: 14
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Size

Maximum size: 96 mm SL
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Max. size

9.6 cm SL (male/unsexed; (Ref. 2880))
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Diagnostic Description

Diagnosis: scales distinctly larger above than below lateral-line; 8 teeth in outer tooth row of upper jaw; parietal fontanel absent (Ref. 2880, 81279). Description: upper jaw prominent; two tooth rows on premaxilla, the outer row with 8, the inner with 12 or 13 teeth; mandible with single row of rather numerous (16-20) outer teeth; none of fins filamentous; anal fin with 3 unbranched and 11 branched rays; sexual dimorphism on anal fin: females - hyaline with black spot on rays beneath adipose fin, males - lemon yellow (sometimes yellow-ochre) with 5 dark or black bands and colored margin (Ref. 2880, 81279). Coloration: live specimens have two lateral bands, the upper bad is red-orange, the lower blue-green; upper part of eye red; dorsal fin with white-edged black spot lined with a clear zone which occupies 2/3 of the anterior portion of the dorsal; preserved specimens have light dorsal region with black dots on scale centres; sides with light longitudinal band and dark lower half of body. Back, snout and median rays of caudal fin (apart from blotches on dorsal and anal fins) dark (Ref. 2880, 81279).
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
A pelagic riverine fish that feeds on worms, insects and crustaceans. In aquaria female lays up to 1,000 eggs, after vigorous driving by the male, which hatch in 30 to 34 hours. Grows to 9.6 cm in standard length.

Systems
  • Freshwater
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Environment

pelagic; freshwater; pH range: 6.0 - 8.0; dH range: 5 - 19
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Trophic Strategy

Feeds on worms, insects and crustaceans.
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Diseases and Parasites

Viral Diseases (general). Viral diseases
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Hidden Viral Infection. Viral diseases
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Molecular Biology and Genetics

Molecular Biology

Barcode data: Arnoldichthys spilopterus

The following is a representative barcode sequence, the centroid of all available sequences for this species.


No available public DNA sequences.

Download FASTA File
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Statistics of barcoding coverage: Arnoldichthys spilopterus

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 1
Specimens with Barcodes: 3
Species With Barcodes: 1
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
VU
Vulnerable

Red List Criteria
B1ab(ii,iii,v)+2ab(ii,iii,v)

Version
3.1

Year Assessed
2010

Assessor/s
Olaosebikan, B.D. & Lalèyè, P.

Reviewer/s
Abban, K. & Darwall, W.

Contributor/s

Justification
This species is found fewer than 10 locations in Nigeria mainly in a region affected by oil exploration and the other by deforestation. The extent of occurrence and area of occupancy thresholds are estimated at less than 20,000 km² and less than 2,000 km², respectively. As the quality of habitat is also declining it qualifies as Vu B1ab(iii)+2ab(iii). Sub criterion c is not applicable because there is no evidence of extreme fluctuation in EOO or AOO.
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Population

Population
No available data.

Population Trend
Unknown
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Threats

Major Threats
Since there is an extensive aquaria trade in this fish, mainly by wild capture, it can be inferred that the stock may be on a downward trend. This is coupled with deforestation and pollution in it ranges resulting in habitat loss and decline in quality.
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Vulnerable (VU) (B1ab(ii,iii,v)+2ab(ii,iii,v))
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Management

Conservation Actions

Conservation Actions
No avalaible data.
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Relevance to Humans and Ecosystems

Benefits

Importance

aquarium: commercial
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Wikipedia

Arnoldichthys spilopterus

Arnoldichthys spilopterus, the Niger tetra, is a characin endemic to Nigeria.

Information[edit]

The Arnoldichthys spilopterus is kept as an aquarium fish. It is the only member of its genus. It is considered to be a freshwater species that are found in a pelagic range within a tropical climate. The average length of the Arnoldichthys spilopterus as an unsexed male is about 9.6 centimeters or about 3.7 inches. Their diet consists of worms, insects, and crustaceans. When kept in an aquarium for breeding, a female can lay about 1,000 eggs. They can hatch between the time of 30-34 hours. If kept in an aquarium, it is recommended to keep a group of at least five of this species together. The minimum size of an aquarium that is adequate for this species is about 100 centimeters.[1] This species is considered to be vulnerable to becoming an endangered species. In Nigeria this species is found in less than ten different areas. Another influence that affects the population of this species in its natural state is oil exploration, deforestation, and pollution. There is also a population trend that is decreasing due to the fish trade that the Arnoldichthys spilopterus has become a part of for the aquatic system and commerce. [2]

Classification[edit]

The taxonomic classification of the Arnoldichthys spilopterus is as follows:

  • Kingdom-Animalia
  • Phylum-Chordata
  • Class-Actinopterygii
  • Order-Characiformes
  • Family-Alestidae[2]

References[edit]

  1. ^ "Arnoldichthys spilopterus". Fish Base. Retrieved 11 March 2013. 
  2. ^ a b "Arnoldichthys spilopterus". International Union for Conservation of Nature and Natural Resources. Retrieved 11 March 2013. 

Notes[edit]

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