Taxonomy
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Perciformes
- Family
- Scombridae
- Genus
- Grammatorcynus
- Species
- bilineatus
Habitat
This species inhabits open pelagic waters of the tropical and subtropical Indian and Pacific Oceans, often near the surface or in depths up to 200 meters. It prefers warmer regions around continental shelves, islands, and coral reefs, where it can find abundant prey.
Diet
The double-lined mackerel primarily feeds on smaller fish like anchovies and sardines, as well as squid and crustaceans. It hunts in schools using high-speed chases, typically during daylight hours when prey is more active. This feeding strategy allows it to efficiently capture fast-moving targets in open water.
Behavior
Double-lined mackerel are highly social, forming large schools for protection against predators and to coordinate hunting efforts. They are fast swimmers and exhibit migratory patterns to follow food sources, often traveling long distances. These fish are diurnal, being most active during the day, and can display aggressive behavior when competing for food within their schools.
Fishing
Target the double-lined mackerel, a thrilling sport fish in the mackerel family, using trolling or casting techniques to simulate their high-speed chases after smaller prey in open waters; troll with flashy lures or live bait like anchovies and sardines rigged on medium-action rods with 10-20 lb test line and reels featuring smooth drags for handling their powerful runs. Opt for metal jigs, spoons, or soft plastics that mimic squid and small fish for effective strikes, as these fish school and feed aggressively during daylight hours. The best seasons are year-round in tropical regions of the Indian and Pacific Oceans, particularly around continental shelves, islands, and coral reefs, with peak activity in warmer months and early morning to late afternoon when they're most active near the surface. Anglers should focus on depths up to 200 meters in these pelagic habitats for the best results. The IGFA all-tackle world record for double-lined mackerel stands at around 6 pounds 10 ounces, showcasing the potential for impressive catches. Conservation-wise, this Least Concern species benefits from angler-funded programs that support habitat protection and sustainable fishing practices, such as slot limits and catch-and-release in certain areas, ensuring healthy populations for future generations while recreational fishing contributes to ocean conservation through license fees and excise taxes.
Conservation Status
Listed as Least Concern by IUCN.