Pacific River Goby

Awaous guamensis

Gobiidae · freshwater and saltwater and brackish water fish

1 minute read · Species guide

Pacific River Goby field guide illustration

About Pacific River Goby

Awaous guamensis is a species of goby native to the Pacific islands from the Marianas to Vanuatu, New Caledonia and Fiji where it can be found in fresh, brackish and marine waters. Recent work based upon morphological and genetic differences has recognized Hawaiian populations of Awaous as being distinct from Awaous guamensis. Consequently, Hawaiian Awaous are now recognized as a distinct species Awaous stamineus.

Description

Males can reach a length of 24.5 cm (9.6 in) SL while females only reach 16.5 cm (6.5 in). The body has white streaks with speckles and a dark olive color.

Ecology

The species is found in slow-moving waters during their annual spawning run to the stream mouth. 'O'opu nakea can swim upstream between 10 and 200 feet in strong currents. They are omnivores, and their diet in one study was found to consist of 84% filamentous algae and 16% of chironomids (non-biting midges) and other animal food.

Eggs are laid downstream just above the estuary, where the males guard the nest. The males make the nest and attract the females who then lay one clutch per year.

Human use

'O'opu nakea are eaten cooked; a common way of preparation is by salting them for 12 hours, then wrapping them in ti leaves and placing them on hot coals.

Article text: Wikipedia contributors, Awaous guamensis (source revision). Licensed under CC BY-SA 4.0. Retrieved 2026-10-11.

Range

Where it lives

Share of 15 GBIF observation records with a state location, across 1 states.
0%
100%
Share of 15 GBIF observation records with a state location, across 1 states.

Share of records by state

Habitat

Water and movement

Water
WoRMS records this species in fresh water, brackish water and the sea.
Migration
Migratory
Pattern
  • Diadromous — moves between fresh water and the sea
  • Amphidromous — moves between fresh water and the sea, but not to spawn

Classification

Taxonomy

Kingdom
Animalia
Phylum
Chordata
Superclass
Actinopterygii
Class
Teleostei
Order
Perciformes
Family
Gobiidae
Genus
Awaous
Species
Awaous guamensis
ITIS TSN
553326
WoRMS AphiaID
277421
GBIF key
5208791
Outside the US
ITIS also files it in Central Pacific Territories.

Common questions about Pacific River Goby

What is the scientific name of Pacific River Goby?
The scientific name is Awaous guamensis, in the family Gobiidae. Classification follows ITIS.
Does Pacific River Goby live in fresh water or salt water?
WoRMS records this species in fresh water, brackish water and the sea.
Where has Pacific River Goby been recorded in the United States?
GBIF has observations in 1 states, with the most records in Hawaii. The map shows observation records, which do not establish the complete natural range.

Closest relatives

Other Awaous species

Same family

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All 33 species in Gobiidae