Alexandria pompano
Alectis alexandrina
Jacks
trevally_jack
About
Jacks are fast, silvery fish often seen cruising in open water or over reefs. In this app the group includes the Giant trevally, Bigeye trevally, and Greater amberjack.
Appearance
Most jacks reach 25 to 100 centimetres long, but the largest species, the greater amberjack, can grow to 2 metres.
Habitat
Jacks are found in the Atlantic, Indian, and Pacific Oceans, in open water above reefs and out in the open sea.
Behaviour
Jacks are fast, active predators that hunt in the water above reefs and in open sea.
Diet
Most jacks hunt other fish in the water column, while some dig in the sea floor to find invertebrates.
Is it dangerous?
harmless to humans
Did you know?
Some jack fossils go back to the early Paleogene, more than 55 million years ago, making this one of the older fish families found on reefs today.
Log it in Into the Blue
Describe what you saw and we name it, then keep every species you find in your Oceandex.
