Japanese dragonet

Callionymus japonicus

Fish
IUCN: Least concern

Usual depth25–125 m
Water temperature15–29 °C
Best monthsJune
How commonRare

About this species

Callionymus japonicus, commonly known as the Japanese longtail dragonet or Japanese Dragonet, is a species of dragonet native to the western Pacific Ocean where it is found at a depth of around 208 metres (682 ft). This species grows to a length of 20 centimetres (7.9 in) SL.

Text from the Wikipedia article “Callionymus japonicus”, licensed CC BY-SA 4.0. Read the article

Where and when

Where it has been recorded

Worldwide

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Best months

Worldwide (open data)

January: 0 records
February: 0 records
March: 1 records
April: 0 records
May: 3 records
June: 8 records
July: 2 records
August: 2 records
September: 3 records
October: 4 records
November: 0 records
December: 3 records

Depth and water temperature

Depth

Mostly recorded at 25–125 m · Deepest record: 166.5 m

10–20 m: 1 records
20–30 m: 6 records
30–40 m: 5 records
40–50 m: 3 records
50–60 m: 1 records
60–70 m: 2 records
70–80 m: 0 records
80–90 m: 3 records
90–100 m: 0 records
100–110 m: 0 records
110–120 m: 0 records
120+ m: 3 records

Water temperature

Recorded in surface water of 15–29 °C

14–16 °C: 1 records
16–18 °C: 0 records
18–20 °C: 1 records
20–22 °C: 4 records
22–24 °C: 2 records
24–26 °C: 6 records
26–28 °C: 4 records
28–30 °C: 32 records

Names and classification

English: Japanese dragonet, Japanese Longtail Dragonet

Names in 1 more languages

Japanese: ヨメゴチ

Other scientific names: Callionymus longicaudatus, Calliurichthys japonicus

Similar species

Common Dragonet
Callionymus enneactis
Blotchfin dragonet
Callionymus filamentosus
Sidespotted Dragonet
Callionymus pleurostictus
Günther's Deepwater Dragonet
Callionymus guentheri
Hildegard's Dragonet
Callionymus hildae
Eightspot Dragonet
Callionymus octostigmatus

Sources and credits

Names and taxonomy: WoRMS (CC BY 4.0) and the GBIF Backbone (CC BY 4.0). Photos: iNaturalist observers, each under the licence shown (CC0, CC BY or CC BY-SA).

Depth, temperature, months and maps: records from OBIS and GBIF under CC0 or CC BY.
Descriptions: Wikipedia, licensed CC BY-SA, each linked to its article.
Conservation status as published by GBIF (IUCN Red List).
137 open-data records from 1782 to 2014.
Species data updated October 26, 2026.

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