Bighead portholefish (Margrethia obtusirostra) fish species and information / pictures of Bighead portholefish - Margrethia obtusirostra

Bighead portholefish (Margrethia obtusirostra) fish species information

Scientific Name
Margrethia obtusirostra

Common Name
Bighead portholefish

Biology
Dorsal spines (total): 0; Dorsal soft rays (total): 15-16; Anal spines: 0; Anal soft rays: 21 - 26. Yellowish in color, darker dorsally, opercle silver, caudal base and peduncle dark brown (Ref. 3991). Pectoral and pelvic fins colorless (Ref. 3991). Dorsal adipose fin present.

Classification

Classified By

Jespersen & T?ning, 1919

Class

Ray-finned fishes (Actinopterygii)

Order

Lightfishes and Dragonfishes (Stomiiformes)

Family

Bristlemouths (Gonostomatidae)

Distribution

Region

Eastern Atlantic

Distribution

Eastern Atlantic: off Portugal south to Morocco including the Azores, Madeira and Canary Islands; off Cape Agulhas, South Africa (Ref. 3991). Western Atlantic: Southeastern Florida and Bermuda to Venezuela, including the Gulf of Mexico and the Caribbean Sea (Ref. 37039). Elsewhere, South Atlantic, tropical and subtropical Indo-Pacific.

Range

33°N - 49°S, 98°W - 154°W

Environment

Climate

Deep-water

Water Temperature From

Unknown °C

Water Temperature To

Unknown °C

Depth From - meters

100 m

Depth To - meters

1739 m

Zone

bathyalpelagic

Environment

Marine; bathypelagic; depth range 100 - 1739 m (Ref. 58018)

Trophic Level

3.5 s.e. 0.48 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

8.3 cm

Common Length

Unknown cm

Phylogenetic Diversity Index

PD50 = 0.7500 many relatives (e.g. carps) 0.5 - 2.0 few relatives (e.g. lungfishes)

Human Uses and Population

Human Uses

Fisheries: of no interest

Vulnerability

Low vulnerability (23 of 100)

Resilience

High, minimum population doubling time less than 15 months (Preliminary K or Fecundity.)

Threat To Humans

Harmless

IUCN Red List Status

Not Evaluated