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Randall's assessor (Assessor randalli) — Plesiopidae

Randall's assessor

Assessor randalli
Family: Plesiopidae

The Randall's assessor (Assessor randalli) is a saltwater fish of the family Plesiopidae that grows up to 4 cm.

Length
4 cm
Water
Saltwater
Depth
1.0–6.0 m
Body shape
Torpedo-shaped
Substrate
Stone or rock
Danger
Harmless
Range
Asia: Australia, China, Taiwan/Ch Taipei, Japan, Ryukyu Is., Papua New Guinea and others

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Description

Randall's assessor is a small longfin (Plesiopidae) from shallow reef water of the western Pacific. The species grows to about 6 cm and has a stocky, yellow-brown to orange body with fine blue lines and rounded fins. Remarkably it often swims upside down, belly to the ceiling, under overhanging reef and in caves. As a mouthbrooder the male protects the eggs in his mouth; it snaps at small zooplankton. The fish is harmless to humans.

Frequently asked questions

How do you recognise the Randall's assessor?

The Randall's assessor has a torpedo-shaped body and is mainly yellow-gold.

Where does the Randall's assessor live?

The Randall's assessor lives in the sea (marine waters) and is mostly found around stony or rocky ground. Asia: Australia, China, Taiwan/Ch Taipei, Japan, Ryukyu Is., Papua New Guinea and others

How big does the Randall's assessor get?

The Randall's assessor grows to a maximum of about 4 cm.

Is the Randall's assessor dangerous to humans?

No, the Randall's assessor is harmless to humans. This species is harmless to humans. No specific first aid is needed. Still handle the fish with care: mind the fin rays and the sharp edges of the gill cover, and rinse any scratch with clean water and cover it. For a dirty or deep wound check tetanus status.

More photos

Randall's assessor (Assessor randalli) — Plesiopidae — 2
Randall, John E. (CC0 1.0) via GBIF — USNM
Randall's assessor (Assessor randalli) — Plesiopidae — 3
iNaturalist ((c) Suzu Sato, some rights reserved (CC BY-NC))
Fin

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All data

Identification

English name
Randall's assessor sourced
Scientific name
Assessor randalli
Family
Plesiopidae

Appearance

Size class
Small verified
Max length (cm)
4.0 verified
Body shape
Torpedo-shaped sourced
Dominant colour
Yellow / gold sourced
Tail shape
Rounded inferred

Habitat & distribution

Water type
Saltwater sourced
Substrate
Stone or rock sourced
Min depth (m)
1.0 verified
Max depth (m)
6.0 verified
Natural range
Asia: Australia, China, Taiwan/Ch Taipei, Japan, Ryukyu Is., Papua New Guinea and others sourced
Origin
Native inferred

Behaviour & biology

Territorial
Yes inferred
Reproduction
Separate sexes inferred
Sexual dimorphism
No inferred
Seasonality
Present year-round in its habitat; no pronounced seasonality known. inferred

For anglers

Fishing method
Small in size and barely an angling target; mostly caught incidentally or as baitfish. inferred
Regulations source
FishBase ↗ inferred

Safety

Danger to humans
Harmless verified
First aid
This species is harmless to humans. No specific first aid is needed. Still handle the fish with care: mind the fin rays and the sharp edges of the gill cover, and rinse any scratch with clean water and cover it. For a dirty or deep wound check tetanus status. verified

Status & sources

Sources
FishBase via GBIF (DwC-A), CC-BY-NC 4.0

Same genus Assessor

More from the family Plesiopidae

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