What does atlantic horse mackerel eat?
What is established about how atlantic horse mackerel feeds, kept separate from what anglers infer from it.
What is known about how it feeds
Two feeding strategies live inside one species here, and which one is operating depends on how big the fish is.
Small horse mackerel are planktivores. They feed on copepods and euphausiids in the water column, taking them individually by sight in a manner closer to a sardine than to a predator, and the catalogue records that relationship at group level because that is the granularity the evidence has.
Larger fish become piscivorous. Small shoaling clupeids — sprat above all — enter the diet as gape allows, and a mature horse mackerel hunting sprat behaves like the carangid it is rather than like a plankton feeder.
The transition is gradual, size-dependent and reversible within a season: a shoal that finds dense plankton will feed on plankton whatever its size. This is the ontogenetic shift in its clearest and least tidy form, and it explains why the same species can be seen boiling on the surface after fry in one week and ignoring everything an angler offers in the next.
Vertical migration completes the picture. Horse mackerel move up through the water column at night and down by day, following the plankton that either is their food or is their prey's food, so depth and time of day are the same variable seen twice.
The food
What the catalogue holds a verified dietary relationship for. Each entry carries its own evidence, and each is recorded at the granularity the source actually used: a named species where the source named one, a taxon or food category where it said “polychaetes”, “crustaceans” or “detritus” and meant it. That is why this list is shorter than the animal’s real diet rather than longer.
- Krill and planktonic crustaceans as prey — a taxon record: the evidence names this group, not a species
Horse mackerel feed on planktonic crustaceans through much of the year, taking small fish as they grow, which is the same ontogenetic shift mackerel make.
- European sprat — Sprattus sprattus
Larger horse mackerel take sprat and other small clupeids, and shoals of both together are a common feature of autumn inshore water.
Food the catalogue does not hold records for
These are real components of the diet, listed as plain text because FishingHQ has no page for them yet. Inventing pages to make the list look fuller would be the fabrication the whole approach exists to prevent.
- copepods
- fish larvae
- small squid
- juvenile sandeel
- mysids
What anglers do with this
Everything below is interpretation, not finding. It is what experienced anglers conclude from the biology above, and the reasoning is usually sound and almost never tested. It is separated from the biology deliberately.
The plankton-feeding phase is the practical problem, and anglers describe it consistently: a shoal that is filtering small crustaceans will ignore anything of bait size, and no change of presentation solves it. Recognising that state rather than working through the tackle box is the skill.
The vertical migration is used to argue for fishing deeper by day and shallower after dark, which is a straightforward inference from a documented behaviour and is held across the European sea angling tradition as convention.
Horse mackerel are also taken deliberately as a bait species for larger predators in several fisheries, which is a use rather than a diet fact and is evidenced separately on the records that describe it.
What this does not establish
The plankton relationship is recorded at group level because the sources record it that way, and the sprat relationship describes larger fish. Neither establishes proportions, and the balance between them shifts with fish size, season and what happens to be dense in the water. Nothing here describes any particular shoal.
Where this connects
These are the baits, lures, methods and explainers FishingHQ already joins to this fish — which is why the list is sometimes short. They are not chosen for this page, and a link here means an evidenced relationship exists, not that it follows from the diet.
Methods used for it
The science behind the feeding
This page covers feeding. The Atlantic horse mackerel record covers identification, lifecycle, seasonal behaviour, handling and the sources behind all of it.
Reviewed 2026-08-12.