Greenback horse mackerel (Trachurus declivis) fish species and information / pictures of Greenback horse mackerel - Trachurus declivis

Greenback horse mackerel (Trachurus declivis) fish species information

Scientific Name
Trachurus declivis

Common Name
Greenback horse mackerel

Biology
Commonly found near the bottom, in midwater and occasionally at the surface (Ref. 9258) in continental shelf waters (Ref. 27930). They form pelagic schools for most of the year but may move close to the sea bed during winter (Ref. 27931). Generally found at less than 300 m water depth with temperature less than 16? C (Ref. 9072). Juveniles inhabit coastal and estuarine waters although they may sometimes be found offshore (Ref. 27930). Feed mostly during the day mainly on krill and other planktonic crustaceans, light fish (Sternoptychidae) and lantern fish (Myctophidae) at the edge of the continental shelf (Ref. 27933).

Classification

Classified By
Jenyns, 1841
Class
Ray-finned fishes (Actinopterygii)
Order
Perch-like fish (Perciformes)
Family
Jacks and pompanos (Carangidae)

Distribution

Region
Southwest Pacific
Distribution
Southwest Pacific: Western Australia to New South Wales, including New Zealand. Principal component analysis of morphometric and meristic characters indicates three separate subpopulations in the Great Australian Bight, off New South Wales, and off Tasmania (Ref. 7456).
Range
9°S - 53°S, 112°E - 177°E

Environment

Climate
Temperate
Water Temperature From
Unknown °C
Water Temperature To
16 °C
Depth From - meters
27 m
Depth To - meters
460 m
Zone
benthopelagic
Environment
Marine; brackish; benthopelagic; depth range 27 - 460 m (Ref. 27930), usually ? - 300 m (Ref. 9072)
Trophic Level
3.93 s.e. 0.61 Based on food items.
Occurs in Marine / Salt water
True
Occurs in Brackish water
True
Occurs in Fresh Water
False
Occurs on Reefs
False
Is kept in Aquariums
False

Physical Size and Genetics

Maximum Length
64.0 cm
Common Length
42.0 cm
Phylogenetic Diversity Index
PD50 = 0.5000 many relatives (e.g. carps) 0.5 - 2.0 few relatives (e.g. lungfishes)

Human Uses and Population

Human Uses
Fisheries: highly commercial; gamefish: yes; bait: usually
Vulnerability
Moderate to high vulnerability (50 of 100)
Resilience
Medium, minimum population doubling time 1.4 - 4.4 years (tm=2-4; tmax=25)
Threat To Humans
  Harmless
IUCN Red List Status
  Not Evaluated