Offshore pelagic · Saltwater
Cobia
Rachycentron canadum
Circumtropical and subtropical, absent from the eastern Pacific; found along the US Atlantic and Gulf coasts, seasonally most abundant as it migrates with warming water.
- Inshore
- Nearshore
- Offshore
- Regulated context
- 4 of 4 overlays reviewed
- Reviewed 2026-08-27
Before you target this fish
Regulated context — check the rules for the exact water
Where this applies US Atlantic (Georgia–New York, ASMFC/state waters) and Gulf of Mexico (federal Coastal Migratory Pelagics management); rules differ by region and can change between seasons via quota-driven closures.
The reviewed context, unedited
Atlantic and Gulf cobia are managed as separate stocks with separate rules. Atlantic cobia (Georgia through New York) is managed through an ASMFC interstate plan at the state-water level, with a small recreational bag limit (commonly 1 fish per person, up to a small per-vessel limit) and roughly a 36 in fork length minimum; the fishery has historically run in-season quota closures when landings run ahead of the coastwide annual catch limit, and individual states (South Carolina among them) have closed or shortened their cobia seasons this way. Gulf cobia is managed under the federal Coastal Migratory Pelagics plan, currently listed as open year-round with a similarly small bag limit and 36 in fork length minimum, though Gulf-specific catch-limit adjustments have also been proposed. Confirm the current bag limit, size limit, and whether the season is open with your state agency, ASMFC, or the Gulf/South Atlantic Councils before targeting — do not assume a prior year's dates apply.
Rules for this fish change at a state line and sometimes inside one. Check the ones that apply to the exact water you are standing on before you act on anything here — this record is biology, not permission.
Take this somewhere
This page is the record. The reading is what happens when you add water, a season and a temperature to it — that is where the families below get ranked against each other instead of just listed.
Those three links carry the fish and nothing else. No conditions were declared on this page, so none travel, and the link says so rather than sending an empty reading.
The half nobody publishes
What this record does not know
Everything else on this page comes from a named agency or peer-reviewed source. This is the other side of that: the questions a reviewer went looking for an answer to and came back without, and the fields the record leaves empty because filling them would mean guessing.
It is here rather than at the bottom because a page that only shows what it knows is easy to read as a page that knows everything. For Cobia there are 14 of them.
Named by a reviewer
10Somebody looked for this and wrote down that they did not find it.
- Behaviour
Diel activity pattern not sourced.
Cold-front and water-clarity response not sourced.
Current-facing behavior at a specific piece of structure not sourced beyond general structure-orientation.
- Identification
No sourced population-average length or weight — only maximum size and legal minimum sizes were found, hence status: partial.
Regional common names (e.g. ling, lemonfish) were not confirmed against an acceptable source and are omitted rather than guessed.
Detailed fin-spine count and other meristic identification traits were not found in an acceptable source.
- Forage
Juvenile and young-of-year diet not found in an acceptable source, hence status: partial.
Seasonal diet emphasis not found.
- Season
Winter habitat-use detail beyond a general southward/offshore shift was not found in an acceptable source, and no presentation family for that period was confidently sourced, hence status: partial.
Depth-by-season figures beyond the general 1–70 m range were not found.
Absent from the record
4No reviewer wrote a gap here. The field is simply empty, which is its own answer.
- Water temperature
The temperature figures describe where this fish is found and caught, not a measured preference. Those are different claims and the record only has the weaker one.
- Positioning
No sourced account of light or time-of-day behaviour. Light stays a declared condition rather than a prediction.
- Identification
No reviewed image. A photograph is only in this catalog when an agency or a named creator labelled the subject, and nobody has cleared one for this species yet.
- Population context
No regional population profile is registered. The species-level reading stands on its own; it does not silently become a local one.
Where the record puts it
Water and range
Inshore
2 reviewed holding classes- Channel edge
- Bridge piling
Nearshore
3 reviewed holding classes- Artificial reef
- Wreck
- Inlet mouth
Offshore
3 reviewed holding classes- Weed line
- Current rip
- Open-water bait school
DepthRanges from shallow bays and inlets to the edge of the continental shelf; adults are commonly found roughly 1–70 m deep, following bait and temperature rather than a fixed depth.
Moving waterFollows temperature-driven seasonal migration along the coast and uses current-formed structure — weed lines, rips, and temperature breaks — while moving; also holds tight to fixed structure (channel edges, bridges, buoys, wrecks) rather than working an open tide line from a fixed station.
No sourced account of how light or time of day changes its behaviour.
Thermal band
Temperature
- Reported active
- 68–82°F
- Cold edge
- 68°F
These describe where the fish is found, not what it prefers.
ASMFC's cobia species page reports Atlantic coast nearshore aggregations beginning as water reaches 20-25°C (68-77°F); the Gulf of Mexico Fishery Management Council's cobia page separately gives Gulf spawning at 23-28°C (73-82°F) from April to September, and South Carolina DNR's State Wildlife Action Plan supplemental report corroborates the ~20°C (68°F) nearshore-aggregation threshold. These are distribution/timing observations rather than a single lab-measured preference study, and the range given here blends an Atlantic migration threshold with a Gulf spawning window rather than one homogeneous figure.
How it uses water
Behaviour
Frequently associates with large free-swimming animals — sharks, sea turtles, and rays — as well as with fixed structure, rather than schooling with conspecifics.
Strong, aggressive predator; feeds mainly on crustaceans (notably crabs) but also takes fish and squid.
Not clearly sourced by time of day; classified as mixed pending a source-backed determination rather than left blank, since the field is required.
Seasonal activityStrong seasonal migrator: moves south and offshore into warmer water in late fall and winter, then back north and inshore as water warms in spring, producing the well-known spring nearshore migration on the Atlantic coast that is commonly sight-fished from small boats along open beaches.
Depth movementRanges from shallow bays and inlets to the edge of the continental shelf depending on season and life stage, tracking bait and temperature rather than holding a fixed depth.
CoverStrongly structure- and object-oriented — buoys, floating debris, wrecks, artificial reefs, and large free-swimming animals (sharks, turtles, rays) all draw cobia.
Open waterDuring migration, cruises along the beachfront and over nearshore/inner-shelf water, often near the surface, rather than holding to a single piece of structure.
Spawning (conservation context)Multiple-batch spawner over an extended spring-through-summer window on inner-to-mid continental shelf water; this record excludes specific spawning and staging locations as conservation context only.
Where the general rule stops
- Cobia frequently travel with sharks, rays, and sea turtles; the presentations above describe technique classes only and are not license to crowd or harass those animals.
What it can eat
Forage
- Crustaceans
- Small forage fish
- Mollusks
Strong, aggressive predator feeding mainly on crustaceans, especially crabs, with fish and squid also taken. Diet capacity is not evidence of a current bait event.
- Feeding style
- Opportunistic
- Feeding zone
- Mixed
By life stage
- Adult
- Crabs and other crustaceans predominate, with fish and squid also taken.
Diet capacity described here is not proof of a current feeding event; what cobia are actually eating on a given day still has to come from direct observation.
Through the year
Season
Spring
- Where they sit
- Nearshore and inshore water along the coast, cruising near the surface as it moves north and inshore with warming water; structure use includes buoys, channel edges, and bridges.
- Movement
- Peak of the northward and inshore migration on the Atlantic coast.
- Temperature
- Movement tracks warming water; field-observed adult range runs roughly 19.6–28.0°C depending on region and season.
What that changesFlats sight cast and run-and-gun cast to sighted cruising fish inshore and nearshore; structure pitch at bridges and channel edges.
Spawning begins in this window on the inner-to-mid shelf in at least part of the range; specific sites and timing are excluded from this record.
Summer
- Where they sit
- Nearshore and offshore shelf water; continues holding near structure and cruising near the surface.
What that changesLive-bait slow troll and tide-line drift along weed lines and current rips offshore; run-and-gun cast to sighted fish nearshore.
Documented spawning continues into this season, particularly for Gulf populations.
Fall
- Where they sit
- Begins moving south and offshore toward warmer water.
- Movement
- Southward and offshore migration begins.
What that changesTide-line drift and live-bait slow troll along nearshore and offshore structure and current edges.
Winter
- Where they sit
- Concentrated in warmer southern/offshore water for the Atlantic stock; Gulf fish shift toward south Florida from the northeastern Gulf.
Spawning · Spring, Summer
Multiple-batch spawner over an extended spring-through-summer window on inner-to-mid continental shelf water; this record excludes specific spawning locations and staging areas as conservation context only.
Recorded as conservation context. No spawning site, staging concentration or migration bottleneck is named anywhere in this catalog, because naming one is how a population gets fished out.
Telling it apart
Identification
What to look at
- Broad, flattened head with a shark-like silhouette that leads to frequent misidentification as a shark from a distance.
- Single long-based dorsal fin, unlike the sucker-disc dorsal fin of its closest living relative, the remora.
- Lower jaw protrudes slightly beyond the upper jaw.
- Forked tail.
- Juveniles show alternating black-and-white horizontal stripes with patches of bronze, orange, and green; this patterning is lost in adults, which become uniformly dark brown to silver-brown.
- Average adult length
- A sourced population-average length was not found; legal minimum sizes (roughly 33–40 in depending on jurisdiction and sector) mark the lower end of typically retained fish.
- Common angling size
- Legal fish start around 33–40 in depending on jurisdiction and sector; many landed fish are well under the documented maximum size.
- Typical weight
- A sourced population-average weight was not found; fish over about 50 lb are generally considered large.
- Maximum documented
- Up to about 6–6.5 ft (roughly 2 m) and up to about 100 lb.
- Longevity
- Documented to roughly 12 years in one NOAA source; this record does not attempt to resolve other longevity estimates in the wider literature.
What it gets confused with
- Remora / sharksucker (family Echeneidae)
- Cobia's closest living relative; remoras have a modified sucker disc on top of the head where cobia instead has a normal long-based dorsal fin, and remoras stay much smaller.
- Small coastal sharks (various)
- Cobia's flattened head and dark, uniform coloration cause frequent confusion with sharks at a distance, but cobia have a single long dorsal fin set well back on the body and lack visible gill slits along the side.
What follows from all of that
Presentation families
Inshore
Flats sight cast
Present to a fish you have actually seen, leading it so the bait arrives without landing on it.
- spot first, cast second
- lead the fish
- quiet entry
- strip or retrieve across its path
What it asks of the tackle
- Depth control
- Low
- Sensitivity
- High
- Casting distance
- Moderate
- Weight range
- Unweighted to 1/4 oz
- Cover resistance
- Low
- Line visibility
- Low
- Retie frequency
- Moderate
Run-and-gun cast
Cast into visible surface activity without running the school over.
- approach up-wind and off to the side
- cast to the edge of the bust
- fast retrieve
- leave before you scatter it
What it asks of the tackle
- Depth control
- Low
- Sensitivity
- Moderate
- Casting distance
- Long
- Weight range
- 3/4–3 oz
- Cover resistance
- Low
- Line visibility
- Secondary
- Retie frequency
- Moderate
Structure pitch
Put a bait tight against hard structure and get it out again before the tide sweeps it into the barnacles.
- accurate short casts
- immediate contact
- lead them out
- expect abrasion
What it asks of the tackle
- Depth control
- Moderate
- Sensitivity
- High
- Casting distance
- Short
- Weight range
- 1/8–3/4 oz
- Cover resistance
- High
- Line visibility
- Secondary
- Retie frequency
- Very high
Nearshore
Run-and-gun cast
Cast into visible surface activity without running the school over.
- approach up-wind and off to the side
- cast to the edge of the bust
- fast retrieve
- leave before you scatter it
What it asks of the tackle
- Depth control
- Low
- Sensitivity
- Moderate
- Casting distance
- Long
- Weight range
- 3/4–3 oz
- Cover resistance
- Low
- Line visibility
- Secondary
- Retie frequency
- Moderate
Live-bait slow troll
Move live bait just fast enough to cover water while it still swims naturally.
- barely-moving speed
- bait leads the boat
- let it swim
- drop back on a follow
What it asks of the tackle
- Depth control
- Moderate
- Sensitivity
- High
- Casting distance
- None
- Weight range
- Unweighted to 4 oz
- Cover resistance
- Low
- Line visibility
- Low
- Retie frequency
- Moderate
Structure vertical
Hold a presentation in the water column directly over hard structure and stay there as the boat moves.
- stay vertical
- hold the depth band
- short lifts
- reset when the line angles
What it asks of the tackle
- Depth control
- High
- Sensitivity
- High
- Casting distance
- None
- Weight range
- 2–16 oz
- Cover resistance
- High
- Line visibility
- Secondary
- Retie frequency
- High
Offshore
Tide-line drift
Fish the visible seam where two bodies of water meet, letting the rip do the work.
- find the colour change
- present up-current of the edge
- let it wash through
- re-run the line
What it asks of the tackle
- Depth control
- Moderate
- Sensitivity
- Moderate
- Casting distance
- Moderate
- Weight range
- 1/4–3 oz
- Cover resistance
- Low
- Line visibility
- Moderate
- Retie frequency
- Moderate
Run-and-gun cast
Cast into visible surface activity without running the school over.
- approach up-wind and off to the side
- cast to the edge of the bust
- fast retrieve
- leave before you scatter it
What it asks of the tackle
- Depth control
- Low
- Sensitivity
- Moderate
- Casting distance
- Long
- Weight range
- 3/4–3 oz
- Cover resistance
- Low
- Line visibility
- Secondary
- Retie frequency
- Moderate
Live-bait slow troll
Move live bait just fast enough to cover water while it still swims naturally.
- barely-moving speed
- bait leads the boat
- let it swim
- drop back on a follow
What it asks of the tackle
- Depth control
- Moderate
- Sensitivity
- High
- Casting distance
- None
- Weight range
- Unweighted to 4 oz
- Cover resistance
- Low
- Line visibility
- Low
- Retie frequency
- Moderate
What moves them for this fish
Reviewed rules that push particular families up when the conditions match. Each one names the conditions it needs and why it exists, so you can disagree with it.
Cobia's spring push is a near-surface, sight-fished migration along the beachfront and into inshore water, so presentations built around spotting a cruising fish and casting to it, or working the bridges and channel edges it migrates past, fit better than a blind soak.
When
Inshore · Spring
Moves up
Flats sight cast, Run-and-gun cast, Structure pitch
Reviewed 2026-08-30
Cobia are strongly object-oriented, holding tight to buoys, wrecks, and artificial reefs rather than working open water, so a presentation that stays in the column directly over that structure fits its documented behavior.
When
Nearshore · Wreck, Artificial reef
Moves up
Structure vertical, Live-bait slow troll
Reviewed 2026-08-30
Offshore, cobia use current-formed features -- weed lines and rips -- while moving rather than holding a fixed lie, so working the visible seam or slow-trolling live bait along it fits better than a stationary approach.
When
Offshore · Weed line, Current rip
Moves up
Tide-line drift, Live-bait slow troll
Reviewed 2026-08-30
Where every sentence came from
Sources
Agency
NOAA Fisheries — Cobia species profile
Used for habitat, thermal band and presentation families; identification; behaviour; forage; season. Read 2026-08-30, next check 2026-11-27.
Agency
Gulf States Marine Fisheries Commission — Cobia life history and habitat summary table
Used for habitat, thermal band and presentation families; behaviour; season. Read 2026-08-30, next check 2026-11-27.
Agency
Atlantic States Marine Fisheries Commission — Cobia species/management page and FMP review (FY2023)
Used for habitat, thermal band and presentation families. Read 2026-08-27, next check 2026-11-27.
Agency
NOAA Fisheries Bulletin — Atlantic cobia (Georgia through New York) recreational season closure notices
Used for habitat, thermal band and presentation families. Read 2026-08-27, next check 2026-11-27.
Agency
Gulf of Mexico Fishery Management Council — Cobia fishing regulations
Used for habitat, thermal band and presentation families. Read 2026-08-27, next check 2026-11-27.
Agency
Florida Fish and Wildlife Conservation Commission — Cobia recreational regulations
Used for habitat, thermal band and presentation families. Read 2026-08-27, next check 2026-11-27.
Agency
South Carolina DNR - State Wildlife Action Plan supplemental species report: Cobia (2015)
Used for habitat, thermal band and presentation families. Read 2026-08-27, next check 2026-11-27.
Agency
USGS Nonindigenous Aquatic Species — Cobia fact sheet
Used for identification. Read 2026-08-30, next check 2026-11-25.
A source with no link predates the rule that one has to carry a URL. It is still a real citation and still checkable; it just takes a search rather than a click, and that is worth knowing before you rely on it.