Jack Mackerel
A schooling pelagic jack of the eastern Pacific, Trachurus symmetricus ranges from southeastern Alaska south through Baja California and into the Gulf of California.
Despite being a member of the jack family rather than a true mackerel, it carries the mackerel name and fills a similar ecological role — a fast-moving, baitfish-sized predator that travels in massive schools.
Most anglers encounter them while targeting other species or deliberately loading the livewell before a tuna or salmon run.
Scientific Name: Trachurus symmetricus
Also known as Pacific Jack Mackerel, Californian Jack Mackerel, Charrito chicharo
- Metallic blue to olive green across the back, fading to white or silver on the lower two-thirds — a classic pelagic countershading pattern.
- A prominent black blotch on the upper edge of the gill cover is the clearest field mark separating this species from similar schooling fish.
- Large eyes with fatty eyelids and a pointed snout; the lateral line scales are enlarged and scute-like, a characteristic jack-family trait.
- Common size runs around 55 cm (22 in); maximum recorded is 81 cm (32 in), with fish capable of living 30 years.
What to know
Habitat Distribution
- Native to the eastern Pacific Ocean from southeastern Alaska to the Gulf of California, with occasional records as far south as the Galápagos Islands.
- A pelagic-oceanic species that moves freely from the surface down to 400 m (1,300 ft), with adults commonly found 500 miles or more offshore.
- Prefers subtropical water temperatures and is most abundant in the productive upwelling zones along the Pacific coast of North America.
Specific Spots
- Juveniles concentrate around kelp beds, piers, and bridge pilings — structure that provides cover and concentrates the small crustaceans and fish larvae they feed on.
- Larger adults push inshore seasonally and can be found around wharves and man-made structures, where they mix with sardines, anchovies, and Pacific mackerel.
- Offshore, schools suspend in open water and are often located by watching for bird activity or baitfish surface disturbance rather than by targeting specific bottom structure.
Jack Mackerel FAQ
Answers from onWater's species guide.
What are the best lures and bait for Jack Mackerel?
Sabiki rigs (also called bait flies) are the most reliable method, drop them through a school and retrieve slowly; multiple fish per cast is common when fish are stacked.
What do Jack Mackerel eat?
Primarily zooplankton, small crustaceans, and fish larvae, which is why sabiki rigs (strings of tiny flashy hooks that mimic small shrimp or fish fry) are so effective; the fish are essentially filter-feeding through a school of tiny imitations.
Where do Jack Mackerel live?
Native to the eastern Pacific Ocean from southeastern Alaska to the Gulf of California, with occasional records as far south as the Galápagos Islands. A pelagic-oceanic species that moves freely from the surface down to 400 m (1,300 ft), with adults commonly found 500 miles or more offshore.
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