Overview

Distribution

Range Description

This species is endemic to the Federated States of Micronesia, where it is known from Pohnpei and Kosrae Islands in the Eastern Caroline Islands (Parenti and Maciolek 1993). It was described from 17 specimens from one river on Pohnpei. The island of Pohnpei is a total of 355 km² in area. Kosrae island is 110 km² in area.

There is a continuing decline in the area of occupancy (previously the species was recorded from three rivers and more recently from only two (Buden et al. 2001)), in the area and quality of habitat, and in the number of locations in which the species is found (now two).
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Oceania: Ponape [=Pohnpei] in Eastern Caroline Islands, Micronesia.
  • Parenti, L.R. and J.A. Maciolek 1993 New sicydiine gobies from Ponape and Palau, Micronesia, with comments on systematics of the subfamily Sicydiinae (Teleostei: Gobiidae). Bull. Mar. Sci. 53(3):945-972. (Ref. 11224)
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Western Pacific.
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Physical Description

Morphology

Dorsal spines (total): 7; Dorsal soft rays (total): 10; Analspines: 1; Analsoft rays: 10
  • Parenti, L.R. and J.A. Maciolek 1993 New sicydiine gobies from Ponape and Palau, Micronesia, with comments on systematics of the subfamily Sicydiinae (Teleostei: Gobiidae). Bull. Mar. Sci. 53(3):945-972. (Ref. 11224)
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Size

Maximum size: 101.5 mm SL
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Max. size

10.2 cm SL (male/unsexed; (Ref. 11224))
  • Parenti, L.R. and J.A. Maciolek 1993 New sicydiine gobies from Ponape and Palau, Micronesia, with comments on systematics of the subfamily Sicydiinae (Teleostei: Gobiidae). Bull. Mar. Sci. 53(3):945-972. (Ref. 11224)
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Type Information

Paratype for Sicyopterus eudentatus Parenti & Maciolek
Catalog Number: USNM 322473
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
Collector(s): J. Maciolek & J. Ford
Year Collected: 1982
Locality: Ponape, Nanpil River, Transect Above Reservoir., Pohnpei, Micronesia, Caroline Islands
  • Paratype: Parenti, L. R. & Maciolek, J. A. 1994. Bulletin of Marine Science. 53 (3): 964.
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
This is a large, herbivorous riverine goby (Nelson et al. 1996). The species is found in rivers on rocky substrates and feeds on algae.

Systems
  • Freshwater
  • Marine
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Environment

demersal; amphidromous (Ref. 59012); freshwater; brackish; marine
  • Donaldson, T.J. and R.F. Myers 2002 Insular freshwater fish faunas of Micronesia: patterns of species richness and similarity. Environ. Biol. Fish. 65:139-149. (Ref. 59012)
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Migration

Amphidromous. Refers to fishes that regularly migrate between freshwater and the sea (in both directions), but not for the purpose of breeding, as in anadromous and catadromous species. Sub-division of diadromous. Migrations should be cyclical and predictable and cover more than 100 km.Characteristic elements in amphidromy are: reproduction in fresh water, passage to sea by newly hatched larvae, a period of feeding and growing at sea usually a few months long, return to fresh water of well-grown juveniles, a further period of feeding and growing in fresh water, followed by reproduction there (Ref. 82692).
  • Donaldson, T.J. and R.F. Myers 2002 Insular freshwater fish faunas of Micronesia: patterns of species richness and similarity. Environ. Biol. Fish. 65:139-149. (Ref. 59012)
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
EN
Endangered

Red List Criteria
B1ab(ii,iii,iv)

Version
3.1

Year Assessed
2012

Assessor/s
Boseto, D.

Reviewer/s
Keith, P., Larson, H. & Hoese, D.

Contributor/s

Justification
The species is found on the islands of Pohnpei and Kosrae where its extent of occurrence is approximately 485 km². The species' area of occupancy is far less due to the distribution of available habitat (rivers). The species has been recorded from three locations (three rivers). There is continuing decline in the area of occupancy (the species was previously recorded from three rivers and more recently from only two), the area and quality of habitat, and in the number of locations (now two). This species is threatened by agricultural run-off from sakau production, which is altering the quality of rivers (i.e. the species' habitat).
The species is listed as Endangered.
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Population

Population
This species is amongst the least common, if not the rarest, of the gobies in Pohnpei rivers (Buden et al. 2001) and Kosrae rivers (D. Boseto pers. obs. 2008).
The 17 type specimens were found in the Nanpil-Kiepw river in 1982. In 2001, no specimens were found in the Nanpil-Kiepw river. One specimen was found in the Senipehn River at 92 m.

Population Trend
Decreasing
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Threats

Major Threats
The production of sakau on Pohnpei has resulted in the deforestation, destruction and conversion of habitats on the island, often resulting in sedimentation (Merlin and Raynor 2005). This is a major threat to the species, as sedimentation can interfere with flow, recruitment and movement of the species.
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Endangered (EN) (B1ab(ii,iii,iv))
  • IUCN 2006 2006 IUCN red list of threatened species. www.iucnredlist.org. Downloaded July 2006.
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Management

Conservation Actions

Conservation Actions
It is not known whether this species occurs in any protected areas.
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