Coryphopterus hyalinus 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Actinopterygii Perciformes Gobiidae

Scientific Name: Coryphopterus hyalinus Böhlke & Robins, 1962
Regional Assessments:
Common Name(s):
English Glass Goby
Spanish Gobio Cristal
Taxonomic Notes:

This species is frequently confused with C. personatus. Coryphopterus hyalinus and C. personatus are genetically distinct (Baldwin et al. 2009).

Assessment Information [top]

Red List Category & Criteria: Vulnerable A3ce ver 3.1
Year Published: 2015
Date Assessed: 2011-03-01
Assessor(s): van Tassell, J., Tornabene, L., Pezold, F., Bouchereau, J.-L. & Aiken, K.A.
Reviewer(s): Cox, N.A.
Contributor(s): Brenner, J., Williams, J.T., Camarena-Luhrs, T. & Robertson, R.
Facilitator/Compiler(s): Barthelat, F. & Ralph, G.
This widely distributed species is common and abundant where it occurs over shallow coral and rocky reef. Coral reef habitat has declined by an overall average of 59% over the past 41 years. Its generation length is short and three generations is inferred as no more than 10 years. It has been documented as susceptible to predation by the invasive lionfish, which now occurs throughout its entire range. An overall 65% decline in prey biomass was directly observed over a period of two years in the Bahamas. However, species-specific declines are not available at this time. Based on this information, a suspected population decline of >30% is projected to occur over the next ten years due to predation by the invasive lionfish. Therefore, it is listed as VU A3ce. We recommend improved monitoring on the effects of habitat degradation and predation by the invasive lionfish. 

Previously published Red List assessments:

Geographic Range [top]

Range Description:Coryphopterus hyalinus is distributed in the western Atlantic from Bermuda, the Bahamas, in the Gulf of Mexico from the Florida Keys, the Flower Garden Banks, and Veracruz, Mexico along the northern Yucatan to northwestern Cuba, and throughout the Caribbean to Trinidad (R. Robertson pers. comm. 2014).

Countries occurrence:
Bahamas; Belize; Bermuda; Colombia; Costa Rica; Cuba; Guatemala; Haiti; Honduras; Mexico; Nicaragua; Panama; Trinidad and Tobago; Turks and Caicos Islands; United States (Florida)
FAO Marine Fishing Areas:
Atlantic – western central
Additional data:
Lower depth limit (metres):52
Upper depth limit (metres):8
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:This species is common. In a survey conducted in the western Caribbean, Coryphopterus hyalinus was one of the most dominant goby species in coral drop-off habitats (Greenfield and Johnson 1999). 

Current Population Trend:Unknown
Additional data:
Population severely fragmented:Unknown

Habitat and Ecology [top]

Habitat and Ecology:Coryphopterus hyalinus is a coral reef-associated species that is found in tropical climates. It is a schooling species that hovers above the substratum mostly in deeper drop-off, and spur-and-groove habitats (Greenfield and Johnson 1999). It is also found near large coral columns and heads at the edges and slopes of patch reefs (depths of eight to 52 m) and feeds on plankton. It hovers above bottom in caves and shaded areas in reefs (Smith 1997). It is a benthic spawner. Fishes of this genus are sequential protogynous hermaphrodites (Cole and Shapiro 1990, Thacker and Cole 2002). Proxy life history data based on a study of Coryphopterus kuna: Larvae settle around 7-9 mm SL, adults mature at 10–11 mm SL and then only attain about 17 mm SL. It has a 60-day pelagic larval life and matures rapidly. They are sexually active in as few as three weeks and live for about two months after settlement. This is the first reported fish in which the pelagic larval duration is generally longer than the post-settlement lifespan, which indicates that C. kuna may represent the extreme of a bipartite life-history strategy: a relatively slow-growing pelagic larval stage, often with delayed metamorphosis, in combination with a rapidly maturing, high-mortality adult stage (Victor et al. 2010). Based on this information, it is inferred that three generation lengths are almost certainly no more than ten years.
Generation Length (years):1
Congregatory:Congregatory (and dispersive)

Use and Trade [top]

Use and Trade: Coryphopterus hyalinus is harvested for the aquarium trade, however, it may also be bred in captivity.

Threats [top]

Major Threat(s): Coryphopterus hyalinus is occasionally taken for the aquarium trade, however it is unlikely to be collected across its entire range and its short generation length makes it resilient to moderate levels of threats.

Between 1970-2011 (41 years), an overall 59% decline in coral cover was directly observed in the Caribbean, which was caused by anthropogenic stressors, Diadema antillarum decline, and coral disease (Jackson et al. 2014). Coryphopterus hyalinus has been identified as a prey item of the invasive Lionfish in the Bahamas and Mexican Caribbean and likely in the remainder of its range (Morris and Akins 2009, Cote and Maljkovic 2010, Green et al. 2012, Valdez-Moreno et al. 2012). It is easily targeted by the lionfish given its small, shallow body and demersal habits (Green and Cote 2014). Due to the lionfish's ability to consume a variety of fishes smaller than 15 cm, both adults and juveniles of this species are likely consumed. In the Bahamas, a 65% decline in lionfish prey biomass over a period of two years was observed (species-specific data are not available at this time) (Green et al. 2012).

Conservation Actions [top]

Conservation Actions: There are no species-specific conservation measures in place.

Citation: van Tassell, J., Tornabene, L., Pezold, F., Bouchereau, J.-L. & Aiken, K.A. 2015. Coryphopterus hyalinus. The IUCN Red List of Threatened Species 2015: e.T155021A46926198. . Downloaded on 16 October 2018.
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