Table of Contents
Overview
Comprehensive Description
Biology
Occurs in sandy areas with living corals and coral rubble in clear waters, Ref. 48637.
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Murdy, E.O. and D.F. Hoese 1985 Revision of the gobiid fish genus Istigobius. Indo-Pacific Fishes (4):41 p. (Ref. 420)
http://www.fishbase.org/references/FBRefSummary.php?id=420&speccode=451
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Distribution
Range Description
Istigobius rigilius is distributed from the Ryukyu Islands (Japan) to the Great Barrier Reef (Australia), and east to New Caledonia, Fiji, Tonga, Palau, Kiribati, Ashmore and Cartier Reefs, and the Marshall Islands.
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Western Pacific: Philippines and Indonesia to Kiribati and Fiji, south to Rowley Shoals in the eastern Indian Ocean and the Great Barrier Reef. Reported from the Ryukyu Islands (Ref. 559).
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Murdy, E.O. and D.F. Hoese 1985 Revision of the gobiid fish genus Istigobius. Indo-Pacific Fishes (4):41 p. (Ref. 420)
http://www.fishbase.org/references/FBRefSummary.php?id=420&speccode=451
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Physical Description
Morphology
Dorsal spines (total): 7; Dorsal soft rays (total): 10 - 11; Analspines: 1; Analsoft rays: 9 - 10; Vertebrae: 26
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Murdy, E.O. and D.F. Hoese 1985 Revision of the gobiid fish genus Istigobius. Indo-Pacific Fishes (4):41 p. (Ref. 420)
http://www.fishbase.org/references/FBRefSummary.php?id=420&speccode=451
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Size
Max. size
10.0 cm SL (male/unsexed; (Ref. 48637))
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Kuiter, R.H. and T. Tonozuka 2001 Pictorial guide to Indonesian reef fishes. Part 3. Jawfishes - Sunfishes, Opistognathidae - Molidae. Zoonetics, Australia. p. 623-893. (Ref. 48637)
http://www.fishbase.org/references/FBRefSummary.php?id=48637&speccode=4748
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Diagnostic Description
Upper pectoral fin rays entire. Predorsal with 7-9 cycloid scales; trunk with ctenoid scales. Segmented and non branching caudal rays 4, branching 13. Body color yellowish white; 2 brown diagonal lines from preoperculum to upper jaw, connected by a single line; 2 almost vertical brown lines on operculum. 4th spine of 1st dorsal fin longest. No sharp distinction between sexes in pigmentation and elongation of 2nd dorsal, pelvic and anal fins. Males sometimes with 3-4 dusky vertical bars on abdomen.
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Murdy, E.O. and D.F. Hoese 1985 Revision of the gobiid fish genus Istigobius. Indo-Pacific Fishes (4):41 p. (Ref. 420)
http://www.fishbase.org/references/FBRefSummary.php?id=420&speccode=451
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Type Information
Holotype for Pallidogobius rigilius Herre
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
Preparation: Radiograph
Collector(s): A. Welander
Year Collected: 1949
Locality: Marshall Islands, Eniwetok Atoll, Rigili Islands, Eniwetok Atoll, Ralik Chain, Marshall Islands, Pacific
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
Preparation: Radiograph
Collector(s): A. Welander
Year Collected: 1949
Locality: Marshall Islands, Eniwetok Atoll, Rigili Islands, Eniwetok Atoll, Ralik Chain, Marshall Islands, Pacific
- Holotype: Herre, A. W. 1953. The Philippine Journal of Science. 82 (2): 185-186.
© Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
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Ecology
Habitat
Habitat and Ecology
Habitat and Ecology
Systems
Istigobius rigilius can be found resting on sand patches, amongst living coral and coral rubble, in clear water lagoons and bays. It occurs at a depth range of 0–30 m.
Systems
- Marine
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Depth range based on 57 specimens in 1 taxon.
Water temperature and chemistry ranges based on 43 samples.
Environmental ranges
Depth range (m): 0 - 29
Temperature range (°C): 24.146 - 29.336
Nitrate (umol/L): 0.043 - 0.895
Salinity (PPS): 32.200 - 35.418
Oxygen (ml/l): 4.427 - 4.889
Phosphate (umol/l): 0.073 - 0.339
Silicate (umol/l): 0.910 - 4.465
Graphical representation
Depth range (m): 0 - 29
Temperature range (°C): 24.146 - 29.336
Nitrate (umol/L): 0.043 - 0.895
Salinity (PPS): 32.200 - 35.418
Oxygen (ml/l): 4.427 - 4.889
Phosphate (umol/l): 0.073 - 0.339
Silicate (umol/l): 0.910 - 4.465
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.
Water temperature and chemistry ranges based on 43 samples.
Environmental ranges
Depth range (m): 0 - 29
Temperature range (°C): 24.146 - 29.336
Nitrate (umol/L): 0.043 - 0.895
Salinity (PPS): 32.200 - 35.418
Oxygen (ml/l): 4.427 - 4.889
Phosphate (umol/l): 0.073 - 0.339
Silicate (umol/l): 0.910 - 4.465
Graphical representation
Depth range (m): 0 - 29
Temperature range (°C): 24.146 - 29.336
Nitrate (umol/L): 0.043 - 0.895
Salinity (PPS): 32.200 - 35.418
Oxygen (ml/l): 4.427 - 4.889
Phosphate (umol/l): 0.073 - 0.339
Silicate (umol/l): 0.910 - 4.465
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.
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Depth: 0 - 30m.
Recorded at 30 meters.
Habitat: reef-associated.
Recorded at 30 meters.
Habitat: reef-associated.
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Environment
reef-associated; marine; depth range 0 - 30 m (Ref. 1602)
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Myers, R.F. 1991 Micronesian reef fishes. Second Ed. Coral Graphics, Barrigada, Guam. 298 p. (Ref. 1602)
http://www.fishbase.org/references/FBRefSummary.php?id=1602&speccode=4306
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Trophic Strategy
Inhabits sandy areas between corals or coral rubble in areas of clear water.
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Myers, R.F. 1999 Micronesian reef fishes: a comprehensive guide to the coral reef fishes of Micronesia, 3rd revised and expanded edition. Coral Graphics, Barrigada, Guam. 330 p. (Ref. 37816)
http://www.fishbase.org/references/FBRefSummary.php?id=37816&speccode=4307
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Life History and Behavior
Life Cycle
Genital papilla of male terminating to side of anal spine. Papilla of female truncate and terminating posteriorly well before origin of anal fin.
-
Murdy, E.O. and D.F. Hoese 1985 Revision of the gobiid fish genus Istigobius. Indo-Pacific Fishes (4):41 p. (Ref. 420)
http://www.fishbase.org/references/FBRefSummary.php?id=420&speccode=451
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FishBase
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Molecular Biology and Genetics
Molecular Biology
Genomic DNA is available from 8 specimens with morphological vouchers housed at Museum of Tropical Queensland
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Statistics of barcoding coverage: Istigobius rigilius
Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Species: 3
Species With Barcodes: 1
Public Records: 0
Species: 3
Species With Barcodes: 1
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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
2010
Assessor/s
Larson, H.K., Murdy, E. & Van Tassell, J.
Reviewer/s
Collen, B., Richman, N., Beresford, A., Chenery, A. & Ram, M.
Contributor/s
De Silva, R., Milligan, H., Lutz, M., Batchelor, A., Jopling, B., Kemp, K., Lewis, S., Lintott, P., Sears, J., Wilson, P., Smith, J. & Livingston, F.
Justification
Istigobius rigilius has been assessed as Least Concern. It is a broad ranging species and while it may be undergoing localised declines due to factors relating to habitat degradation, these threats are not known to pose a significant threat to the global population.
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Trends
Population
Population
Population Trend
Istigobius rigilius is reported as uncommon in the Capricorn-Bunker Group (Lowe and Russell 1990). Nevertheless, it is generally the most common Istigobius species found on coral reefs (E. Murdy pers. comm. 2009).
Population Trend
Unknown
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Threats
Threats
Major Threats
There are no known major threats to Istigobius rigilius. Due to its association with coral habitats, it is likely to be undergoing localised declines from factors relating to habitat degradation such as destructive fishing practices, coral bleaching, sedimentation, coastal development, pollution, and tourism. However, due to the localised nature of these threats, they are not considered to pose a major threat to this broad ranging species.
© International Union for Conservation of Nature and Natural Resources
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Least Concern (LC)
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IUCN 2006 2006 IUCN red list of threatened species. www.iucnredlist.org. Downloaded July 2006.
http://www.fishbase.org/references/FBRefSummary.php?id=57073
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Management
Conservation Actions
Conservation Actions
There are no known species-specific conservation measures in place for Istigobius rigilius, however its distribution may coincide with numerous marine protected areas (MPAs), including the Great Barrier Reef Marine Park.
© International Union for Conservation of Nature and Natural Resources
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