Scientific Name
Grammatorcynus bilineatus

Common Name
Double-lined mackerel

Biology
Inhabits open water but often seen swimming near outer reef walls or deep clear-water slopes (Ref. 48637). Found mostly in shallow reef waters where it forms large schools. Feeds on crustaceans and fishes, particularly clupeoids (Sardinella and Thrissocles), but also other fishes such as Sphyraena and Balistes. Marketed canned and frozen (Ref. 9684). Its flesh is mild and pleasantly flavored, but brushed with lemon juice prior to cooking to remove the ammonia-like smell (Ref. 9684).

Classification

Classified By

R?ppell, 1836

Class

Ray-finned fishes (Actinopterygii)

Order

Perch-like fish (Perciformes)

Family

Mackerels, tunas, bonitos (Scombridae)

Distribution

Region

Indian Ocean

Distribution

Indian Ocean: Red Sea eastward to the Andaman Sea. Western Pacific: Ryukyu Islands to the northern coasts of Australia, including the Marshall Islands and Fiji. Often confused in the literature with Grammatorcynus bicarinatus.

Range

31°N - 25°S, 32°E - 175°W

Environment

Climate

Subtropical

Water Temperature From

Unknown °C

Water Temperature To

Unknown °C

Depth From - meters

15 m

Depth To - meters

Unknown m

Zone

reef-associated

Environment

Marine; reef-associated; oceanodromous (Ref. 51243); depth range 15 - ? m (Ref. 48637)

Trophic Level

4.17999982833862 s.e. 0.69 Based on food items.

Occurs in Marine / Salt water

True

Occurs in Brackish water

False

Occurs in Fresh Water

False

Occurs on Reefs

True

Is kept in Aquariums

False

Physical Size and Genetics

Maximum Length

100.0 cm

Common Length

50.0 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: minor commercial; gamefish: yes

Vulnerability

Moderate to high vulnerability (48 of 100)

Resilience

Medium, minimum population doubling time 1.4 - 4.4 years (Preliminary K or Fecundity.)

Threat To Humans

Harmless

IUCN Red List Status

Not Evaluated