Monster Shrimpgoby, Tomiyamichthys oni (Tomiyama 1936)

A Monster Shrimpgoby, Tomiyamichthys oni, at the Navy Pier, Exmouth, Western Australia, October 2022. Source: Alex Hoschke / License: CC by Attribution-NonCommercial

A profusely freckled and spotted shrimpgoby with round markings along the sides. 

Cite this page as:
Bray, D.J. 2023, Tomiyamichthys oni in Fishes of Australia, accessed 22 Jun 2024,

Monster Shrimpgoby, Tomiyamichthys oni (Tomiyama 1936)

More Info


Exmouth Gulf, Western Australia. Elsewhere the species occurs in the East-Indo-west Pacific. Inhabits sandy and rubble areas on coastal and inner reefs, sharing burrows with alpheid shrimps.

Similar Species

Among other characters, the similar Lady Elliot Shrimpgoby, Tomiyamichthys elliotensis, differs from the Monster Shrimpgoby in having a whitish body with minimal freckling or spotting and large ovate markings along the sides, vs. profuse freckling and spotting and round lateral markings in T. oni


The specific name oni is the Japanese vernacular name for this species - Oni-haze (= Oni-goby)

Species Citation

Cryptocentrus oni Tomiyama, 1936, Japanese Journal of Zoology 7(1)(5): 82, Fig. 32. Type locality: Tokyo fish market, thought to be from Izu, Shizuoka Prefecture, Japan.


Bray, D.J. 2023


Atlas of Living Australia

Monster Shrimpgoby, Tomiyamichthys oni (Tomiyama 1936)


Allen, G.R. 2015.  Descriptions of two new species of shrimpgobies (Gobiidae: Cryptocentrus and Tomiyamichthys) from Papua New Guinea. Journal of the Ocean Science Foundation 16: 67-81

Allen, G.R. & Erdmann, M.V. 2012. Reef fishes of the East Indies. Perth : Tropical Reef Research 3 vols, 1260 pp.

Allen, G.R., Erdmann, M.V. & Brooks, W.M. 2018. A new species of Tomiyamichthys shrimpgoby (Pisces: Gobiidae) from Papua New Guinea. Journal of the Ocean Science Foundation 31: 38-46

Allen, G.R., Erdmann, M.V. & Dudgeon, C.L. 2023. Tomiyamichthys elliotensis, a new species of shrimpgoby (Teleostei: Gobiidae) from Lady Elliot Island, Queensland, Australia. Journal of the Ocean Science Foundation 40; 57-69.

Hoese, D.F., Shibukawa, K. & Johnson, J.W. 2016. Description of a new species of Tomiyamichthys from Australia with a discussion of the generic name. Zootaxa 4079(5): 582-594

Larson, H., Hoese, D., Pezold, F., Murdy, E., Cole, K. & Shibukawa, K. 2021. Tomiyamichthys oni. The IUCN Red List of Threatened Species 2021: e.T193132A2199356. Accessed on 16 November 2022.

Larson, H.K. & Murdy, E.O. 2001. Eleotridae, Gobiidae. pp. 3574-3604 in Carpenter, K.E. & Niem, T.H. (eds). The Living Marine Resources of the Western Central Pacific. FAO Species Identification Guide for Fisheries Purposes. Rome : FAO Vol. 6 pp. 3381-4218.

Tomiyama, I. 1936. Gobiidae of Japan. Japanese Journal of Zoology 7(1)(5): 37-112.

Yanagisawa, Y. 1984. Studies on the Interspecific relationship between gobiid fish and snapping shrimp. II. Life history and pair formation of snapping shrimp Alpheus bellulus. Publications of the Seto Marine Biological Laboratory 29(1-3): 93-116

Quick Facts

Behaviour:Shares burrows with alpheid shrimps

Conservation:IUCN Least Concern

Depth:10-35 m

Fishing:Aquarium fish (uncommon)

Habitat:Reef associated, sandy & rubble areas

Max Size:11 cm SL

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Species Maps

CAAB distribution map