Scarus dubius

The Hawaiian regal parrotfish grows to a maximum length of 35.6 cm.{{Cite journal |last1=Howard |first1=Kathrine G. |last2=Schumacher |first2=Brett D. |last3=Parrish |first3=James D. |date=May 2009 |title=Community structure and habitat associations of parrotfishes on Oahu, Hawaii |url=http://link.springer.com/10.1007/s10641-009-9478-3 |journal=Environmental Biology of Fishes |language=en |volume=85 |issue=2 |pages=175–186 |doi=10.1007/s10641-009-9478-3 |bibcode=2009EnvBF..85..175H |issn=0378-1909|url-access=subscription }} Both male and female regal parrotfish have similar elongated, oval-shaped bodies. The males and females often display different color patterns and intensities. The males are usually more colorful than the females. The male's coloration can include a mix of vibrant blues, oranges, yellows, and greens. In contrast, the females are going to be more dull, expressing shades of green, blue, or brown, and may lack the prominent patterns seen in males.{{Cite web |title=Regal Parrotfish, Scarus dubius |url=https://www.marinelifephotography.com/fishes/parrotfishes/scarus-dubius.htm |access-date=2023-08-04 |website=www.marinelifephotography.com}}

The regal parrotfish produces slimy secretions similar to those of some teleost fish. This slime is produced from goblet cells in the opercular region during the night, leading to the creation of cocoons around their bodies. Researchers have proposed that this is a defense mechanism against predators.{{Cite journal |last1=Hendrickson |first1=W. A. |last2=Ward |first2=K. B. |date=1975-10-27 |title=Atomic models for the polypeptide backbones of myohemerythrin and hemerythrin |url=https://pubmed.ncbi.nlm.nih.gov/5 |journal=Biochemical and Biophysical Research Communications |volume=66 |issue=4 |pages=1349–1356 |doi=10.1016/0006-291x(75)90508-2 |issn=1090-2104 |pmid=5}}

Within the Northwestern Hawaiian Islands, the regal parrotfish is found in abundance at depths ≥ 6 meters.{{Cite journal |last1=Bose |first1=K. S. |last2=Sarma |first2=R. H. |date=1975-10-27 |title=Delineation of the intimate details of the backbone conformation of pyridine nucleotide coenzymes in aqueous solution |url=https://pubmed.ncbi.nlm.nih.gov/2 |journal=Biochemical and Biophysical Research Communications |volume=66 |issue=4 |pages=1173–1179 |doi=10.1016/0006-291x(75)90482-9 |issn=1090-2104 |pmid=2}} As a non-aquarium fish, the regal parrotfish has been found in reef and aggregate coral habitats and reef, and colonized volcanic boulder habitat types.{{Cite journal |last1=Smith |first1=R. J. |last2=Bryant |first2=R. G. |date=1975-10-27 |title=Metal substitutions incarbonic anhydrase: a halide ion probe study |url=https://pubmed.ncbi.nlm.nih.gov/3 |journal=Biochemical and Biophysical Research Communications |volume=66 |issue=4 |pages=1281–1286 |doi=10.1016/0006-291x(75)90498-2 |issn=0006-291X |pmid=3}} Around Oahu, the regal parrotfish has an estimated abundance of 72,140 ± 32.571 and a biomass of 3901 ± 1653 kg.{{Cite journal |last1=Wiesmann |first1=U. N. |last2=DiDonato |first2=S. |last3=Herschkowitz |first3=N. N. |date=1975-10-27 |title=Effect of chloroquine on cultured fibroblasts: release of lysosomal hydrolases and inhibition of their uptake |url=https://pubmed.ncbi.nlm.nih.gov/4 |journal=Biochemical and Biophysical Research Communications |volume=66 |issue=4 |pages=1338–1343 |doi=10.1016/0006-291x(75)90506-9 |issn=1090-2104 |pmid=4}}

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bubius

Category:Fish described in 1828

Category:Taxa named by Edward Turner Bennett

Category:Fish of Hawaii