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Ragfish (Icosteus aenigmaticus) fish species and information / pictures of Ragfish - Icosteus aenigmaticus

Ragfish (Icosteus aenigmaticus) fish species information

Scientific Name
Icosteus aenigmaticus

Common Name
Ragfish

Biology
Dorsal spines : 0; Dorsal soft rays : 52-55; Anal spines: 0; Anal soft rays: 34 - 40. Pectorals rounded, pedunculate. Generally of a chocolate color. Young more robust, with an expanded and rounded caudal fin, 5 pelvic rays, and a brown and yellow irregularly blotched with faint purple color, dusky on fins.

Classification

Classified By

Lockington, 1880

Class

Ray-finned fishes (Actinopterygii)

Order

Perch-like fish (Perciformes)

Family

Ragfish (Icosteidae)

Distribution

Region

North Pacific

Distribution

North Pacific: Japan to southeastern Alaska and to Point Loma, southern California, USA.

Range

66°N - 32°N

Environment

Climate

Deep-water

Water Temperature From

Unknown °C

Water Temperature To

Unknown °C

Depth From - meters

0 m

Depth To - meters

1420 m

Zone

bathyalpelagic

Environment

Marine; bathypelagic; depth range 0 - 1420 m , usually 18 - 732 m

Trophic Level

4.5 s.e. 0.57 Based on food items.

Occurs in Marine / Salt water

True

Occurs in Brackish water

False

Occurs in Fresh Water

False

Occurs on Reefs

False

Is kept in Aquariums

False

Physical Size and Genetics

Maximum Length

213 cm

Common Length

Unknown cm

Phylogenetic Diversity Index

PD50 = 1.5000 many relatives (e.g. carps) 0.5 - 2.0 few relatives (e.g. lungfishes)

Human Uses and Population

Human Uses

Unknown

Vulnerability

High to very high vulnerability (71 of 100)

Resilience

Low, minimum population doubling time 4.5 - 14 years (K=0.13; Fec=293,000)

Threat To Humans

Harmless

IUCN Red List Status

Not Evaluated