Species & PresentationHook the Horizon · field intelligence

Sharks · Saltwater

Blacktip shark

Carcharhinus limbatus

Native warm-temperate to tropical requiem shark of the western Atlantic and Gulf of America; year-round resident of the Gulf, with strong seasonal presence off the southeast Atlantic coast including a well-documented winter aggregation off southeast Florida.

Also called Atlantic blacktip shark, blacktip.

  • Surf
  • Inshore
  • Nearshore
  • Regulated context
  • 4 of 4 overlays reviewed
  • Reviewed 2026-08-27
13 things this record does not know

Before you target this fish

Regulated context — check the rules for the exact water

Where this applies Federal Atlantic HMS EEZ waters (NOAA Fisheries) and Florida state waters (FWC) at minimum; every other Gulf and Atlantic coastal state sets its own rules again.

The reviewed context, unedited

Federal Atlantic HMS rules (NOAA Fisheries) govern federal EEZ waters; Florida state waters are governed separately by FWC, and every other Gulf/Atlantic coastal state sets its own rules again. The two regimes do not match field-for-field. For blacktip specifically the federal and Florida state rules conflict on the one figure anglers care most about: NOAA's current federal recreational rule sets a 54 in fork-length minimum on blacktip (grouped with hammerhead, bull, lemon, nurse, spinner, tiger, blacknose, finetooth, blue, porbeagle, and thresher at 1 shark per vessel per trip), while FWC's state-waters rule places blacktip in its Group 1 with NO minimum size, inside a 1-shark-per-person-per-day, 2-per-vessel bag. A fish legal to keep in Florida state waters on size could be an illegal undersized fish the moment the same boat is in the federal EEZ. Vessel anglers need a federal HMS Angling or Charterboat/Headboat permit plus a shark endorsement (an online ID and regulation course) to retain any shark in federal waters; shore-based anglers in Florida need a separate, no-cost annual FWC Shore-Based Shark Fishing permit and its own online course instead, plus non-offset non-stainless circle hooks, a hook/leader-cutting device, and no chumming from the beach. These are two different permits for two different contexts, not one rule set. A proposed federal rule (Federal Register, published 2026-01-05, comment period closed 2026-03-06) would revise blacktip and spinner minimum size to a default 48 in and move Atlantic sharpnose and bonnethead bag limits from per-person to a per-vessel default with an annually adjustable range; as of the last check this session made, it had not been finalized. Confirm current status before relying on any figure here. Misidentification carries legal exposure: several similar-looking requiem and hammerhead sharks are federally and/or state prohibited, and a prohibited shark must be released without removing it from the water. Verify identification and the rule set for the exact water (state vs. federal) before harvest.

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.

Start a readingRead Blacktip shark on your waterOpens the analyst with this fish already picked.Forage & hatchHatch MatchWhat this fish is likely eating on that kind of water, at that time of year.TackleTackle Link AnalystWhether the line and terminal end you already own can deliver these families.WaterField Sense NavigatorWhere water like this exists, and what it is doing right now.

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 Blacktip shark there are 13 of them.

Named by a reviewer

10

Somebody looked for this and wrote down that they did not find it.

Behaviour

Diel feeding tendency not sourced.

Current-facing / depth-movement / cold-front / angling-pressure response not sourced.

A full preferred or active thermal band (beyond the single winter-aggregation data point) not sourced.

Identification

Typical/maximum weight for the western Atlantic/Gulf stock not found in an agency source.

Regional color variation and a dedicated juvenile-appearance account not found.

A cleaner, non-Australian source for maximum documented length would remove the need to caveat the FRDC figure.

Forage

Seasonal diet emphasis and juvenile/young-of-year diet not sourced.

Prey-size shift with growth (ontogenetic diet shift) not sourced beyond the general adult prey list.

Season

Month-by-month habitat use outside the southeast Florida winter aggregation and its dispersal is not resolved.

Late-fall and early-spring entries are thin; only the one aerial-survey study anchors the winter/spring transition.

Absent from the record

3

No 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.

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

Western Atlantic and Gulf of America continental shelf, roughly Virginia to Brazil with occasional strays to Cape Cod; a large winter aggregation gathers along the southeast Florida coast, which is conservation and identification context, not a location to fish.

Surf

3 reviewed holding classes
  • Surf trough
  • Inner sandbar
  • Rip channel

Inshore

3 reviewed holding classes
  • Creek mouth
  • Channel edge
  • Grass flat

Nearshore

3 reviewed holding classes
  • Nearshore reef
  • Inlet mouth
  • Artificial reef

DepthPrimarily a continental-shelf species; NOAA describes it as occurring from the surf zone out over the shelf, without a specific depth figure in the sources reviewed.

Moving waterNOAA describes blacktips as common near beaches, bays, estuaries, and river mouths, and as regular followers of baitfish schools and of fishing vessels for discards; this is a species that works moving water and structure edges where forage concentrates rather than holding on a single fixed lie.

LightNot resolved from an agency or peer-reviewed source in this review; recorded as a gap rather than assumed.

Thermal band

Temperature

Temperature is the axis that moves the reading most, so it is worth knowing exactly what kind of figure this is.
Reported active
64–77°F
Cold edge
70°F
Warm edge
77°F

These describe where the fish is found, not what it prefers.

Field SST correlates of blacktip presence/migration timing from the southeast Florida winter aggregation study (Kajiura and Tellman 2016, already cited in this record): large numbers aggregate off SE Florida only when nearshore water is below 25°C (77°F); further north at Bulls Bay, South Carolina, sharks begin their southward migration in fall once water drops below 21°C (70°F); they reappear off Daytona Beach, FL in spring at 18-21°C (64-70°F). These describe the migratory/aggregation window of one well-studied wintering population tracked by SST, not a lab-tested preference or a species-wide tolerance limit -- the Gulf of Mexico population this record also covers is a year-round resident and may not follow the same thresholds.

How it uses water

Behaviour

The southeast Florida winter aggregation is a documented, quantified phenomenon (tracked by aerial survey), recorded here as a conservation and identification context — not a location, timing prediction, or bite cue.

NOAA describes a diet of bony fishes, smaller sharks, squid, stingrays, shrimp, and crabs, and notes blacktips regularly follow fishing vessels to take discards — an opportunistic, pursuit-feeding pattern on schooling and discrete prey rather than ambush ambush from cover.

Not resolved to a specific diel pattern from an agency or peer-reviewed source in this review; recorded as a gap.

Seasonal activityPresent year-round in the Gulf of America; along the southeast Atlantic coast, large numbers concentrate nearshore in winter, with Kajiura and Tellman (2016) finding peak aggregation density when water temperature was below about 25°C (77°F), and departure from southeast Florida occurring around the vernal equinox as water warms. This is a distribution finding from one regional aerial-survey study, not a species-wide thermal tolerance range.

Temperature-driven behaviourSee seasonalActivity — the only sourced temperature figure found this session is the sub-25°C (77°F) association with the southeast Florida winter aggregation. No preferred or active thermal band across the species' full range was found; recorded as a catalog-level gap.

Facing the currentNot resolved from a sourced account; recorded as a gap.

Predator avoidanceNot resolved from a sourced account; recorded as a gap.

Spawning (conservation context)Mating occurs March-June; gestation is 11-12 months; pups (3 per litter Atlantic stock, 4-5 Gulf stock) are born the following year in shallow nursery bays and estuaries. Recorded as conservation/life-history context only — no nursery, pupping, or staging location is identified.

Where the general rule stops

  • Do not assume blacktip and spinner shark are interchangeable for regulatory purposes just because both carry a 54 in federal minimum and look alike at boatside; FWC's state-waters minimum size differs between the two species (blacktip: none: spinner: 54 in), so a size that clears one species in state waters does not clear the other.
  • Fin-tip coloration on both blacktip and spinner fades with age and is not reliable on large, older fish; identify by the white (blacktip) vs. black-tipped (spinner) anal fin and by dorsal-fin shape, not by tip color alone.

What it can eat

Forage

A capacity list, not a report from this week. What is actually available on your water is a separate question, and Hatch Match is the tool that asks it.
  • Small forage fish
  • Larger prey fish
  • Crustaceans
  • Mollusks

NOAA Fisheries describes the diet as bony fishes, smaller sharks, squid (mollusks), stingrays, shrimp and crabs (crustaceans), with blacktips also known to follow fishing vessels to take discarded catch. Diet capacity is not evidence of a current bait event.

Feeding style
Opportunistic
Feeding zone
Mixed

By life stage

Juvenile
Not resolved from a sourced account this session; recorded as a gap.
Adult
Bony fish, smaller sharks, cephalopods, stingrays, and crustaceans, per NOAA's species overview.

Diet capacity described here is not proof that a bait event is occurring on any given day. Observed current forage still comes from a user observation or Hatch Match.

Through the year

Season

A year-round Gulf of America resident that becomes strongly seasonal on the southeast Atlantic coast, where a large, well-documented winter aggregation forms nearshore and disperses around the spring equinox. Spring mating and a shallow-nursery pupping season the following year are conservation context, not location guidance.

Winter

Where they sit
Nearshore continental-shelf water off the southeast Atlantic coast, where large seasonal aggregations have been quantified by aerial survey.
Temperature
Aggregation density was highest when water was below about 25°C (77°F) in the one study reviewed (Kajiura and Tellman 2016); this is a regional distribution finding, not a species-wide cold edge.

What that changesChum-established drift and live-bait slow troll are the reviewed nearshore/inshore families that fit working a moving, loosely aggregated shark population from a boat.

What would count against it

  • treating the aggregation as a fixed spot rather than a seasonal, regionally distributed phenomenon

The southeast Florida winter aggregation is documented at the population level; this record does not name or describe it as a place to go.

Spring

Where they sit
Dispersal from the winter aggregation begins around the vernal equinox as water warms; mating occurs March-June.

What that changesSame reviewed families as winter; no new family is introduced.

What would count against it

  • inventing a mating-related bite window

Spring mating is biology, not a targeting cue.

Summer

Where they sit
Gulf of America presence is year-round; Atlantic-coast presence continues along the shelf, bays, and beaches described in the species overview.
Feeding
Opportunistic pursuit of schooling bait fish and discards, per the diet dossier.

What that changesRun-and-gun cast to visible surface activity in the surf/nearshore zone, plus chum-established drift and live-bait slow troll, are the reviewed families that fit this feeding pattern.

What would count against it

  • predicting a specific bite window from season alone

Fall

Where they sit
General shelf, bay, and beach habitat as in summer; specific fall behavior not resolved from a sourced account.

What that changesSame reviewed families as summer.

Spawning · Spring, Early summer

NOAA Fisheries gives mating between March and June and a gestation of 11-12 months, with pups born the following year in shallow nursery bays and estuaries (3 pups per litter in the Atlantic stock, 4-5 in the Gulf stock). Nursery habitat and any staging or pupping concentration are conservation context only; this record does not identify one.

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

Dark gray, bluish-gray, or dusky bronze above, white below, with a pale flank band and black-marked dorsal, pectoral, and lower caudal fins (anal fin white).

What to look at

  • First dorsal fin is tall and narrows to a pointed apex, originating over or just behind the insertion of the pectoral fins, with a moderately long free rear tip (NOAA fin ID guide and NOAA tagging-program ID guide).
  • No interdorsal ridge — a flat back between the two dorsal fins. This rules out sandbar, bignose, and silky shark, which all have a raised interdorsal ridge.
  • Black tips mark the first and second dorsal fins, the pectoral fins, and the lower caudal lobe, but the ANAL FIN IS WHITE / UNMARKED. This is the single most reliable field mark separating blacktip from spinner shark, whose anal fin is black-tipped.
  • A light wedge- or Z-shaped band runs along the flank, widening toward the rear, above a white belly.
  • Snout is rounded and moderately long, in contrast to the more sharply pointed snout of spinner shark.
  • Fin-tip black coloration fades or can be nearly absent on large, older adults — do not rely on tip color alone at any size; check the anal fin and dorsal-fin shape together.
Average adult length
NOAA gives a typical adult length up to about 6-6.5 ft; an Australian stock assessment (a different regional population, cited for context only) records a maximum of 265 cm (about 8.7 ft), which should not be read onto the western Atlantic/Gulf stock.
Common angling size
Federal keeper size in the open, HMS-managed fishery is 54 in fork length; Florida state-waters harvest currently carries no state minimum size (see targetContext for the resulting jurisdictional conflict).
Typical weight
Not found in an agency source reviewed this session; recorded as a gap rather than estimated.
Maximum documented
NOAA states up to about 6.5 ft for the western Atlantic/Gulf population; do not apply the Australian 265 cm figure to this stock.
Longevity
NOAA's oldest documented individual was 15.5 years old; males mature at 4-5 years, females at 6-7 years.

What it gets confused with

Spinner shark
NOAA's own tagging-program guide calls this the most difficult pair to separate. Spinner shark has a BLACK-TIPPED anal fin (blacktip's is white); a shorter, more rounded first-dorsal apex with a shorter free rear tip set further back, roughly over or just behind the pectoral fins' free rear tips (blacktip's taller, more pointed dorsal sits further forward, over the pectoral insertion); a more sharply pointed snout at least as long as the mouth is wide; and pectoral fins marked with black on both surfaces (blacktip shows black mainly on the underside). Fin-tip color fades on large fish in both species, so lead with the anal fin and dorsal-fin shape/position, not tip color.
Sandbar shark (Carcharhinus plumbeus)
Federally and Florida-state PROHIBITED — must be released without removing from the water. Distinguished by a pronounced interdorsal ridge (absent in blacktip) and a very tall, forward-set first dorsal fin. If an interdorsal ridge is present, treat the fish as a possible sandbar shark and release it.
Dusky shark (Carcharhinus obscurus)
Federally and Florida-state PROHIBITED. Has an interdorsal ridge (blacktip lacks one) and a heavier, more robust body with generally unmarked fins.
Bull shark (Carcharhinus leucas)
Open under the same federal 54 in / 1-per-vessel grouping as blacktip, so not a legal-status risk, but worth separating: bull shark has a much stockier body, a short blunt rounded snout, small eyes, and a dorsal fin that slopes rearward with fins that are typically unmarked (NOAA tagging-program ID guide).
Finetooth shark (Carcharhinus isodon)
A smaller requiem shark, open under Florida's Group 1 (no minimum size), with unmarked fins — the absence of any black fin-tip marking separates it from blacktip at any size.

What follows from all of that

Presentation families

These are the families the record will consider for this fish, and what each one has to do. They are not ranked here — ranking needs a season, a temperature and a piece of holding water, which is what the reading is for.

Surf

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

Surf bait soak

Hold a natural bait still on the bottom of a trough or cut and let moving water bring fish to it.

  • enough lead to hold
  • read the trough
  • let the rod load
  • reset as the tide moves the bar
What it asks of the tackle
Depth control
Low
Sensitivity
Moderate
Casting distance
Long
Weight range
2–8 oz of lead
Cover resistance
Moderate
Line visibility
Secondary
Retie frequency
High

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

Inshore

Chum-established drift

Establish a scent trail and drift baits back through it at the speed the current is already moving.

  • consistent trail
  • unweighted or lightly weighted drop-back
  • match the sink to the drift
  • do not outpace the trail
What it asks of the tackle
Depth control
Low
Sensitivity
High
Casting distance
None
Weight range
Unweighted to 2 oz
Cover resistance
Low
Line visibility
Low
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

Tidal drift bait

Let a natural bait travel at the speed of the tide along an edge fish are feeding on.

  • match weight to the run
  • stay in the seam
  • let it swing at the end
  • reset up-tide
What it asks of the tackle
Depth control
Moderate
Sensitivity
High
Casting distance
Short to moderate
Weight range
1/8–1 oz
Cover resistance
Moderate
Line visibility
Low
Retie frequency
High

Nearshore

Chum-established drift

Establish a scent trail and drift baits back through it at the speed the current is already moving.

  • consistent trail
  • unweighted or lightly weighted drop-back
  • match the sink to the drift
  • do not outpace the trail
What it asks of the tackle
Depth control
Low
Sensitivity
High
Casting distance
None
Weight range
Unweighted to 2 oz
Cover resistance
Low
Line visibility
Low
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

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.

  • Peer-reviewed aerial survey work found blacktip aggregation density peaking in nearshore water below about 77°F in winter, so working a moving, loosely grouped population with a maintained scent trail or slow-trolled live bait fits better than a single fixed-station soak.

    When

    Inshore or Nearshore · Winter

    Moves up

    Chum-established drift, Live-bait slow troll

    Reviewed 2026-08-30

  • Blacktips are an opportunistic pursuit predator on schooling baitfish and vessel discards rather than an ambush feeder from cover, so casting to visible surface activity fits the reviewed feeding pattern when forage fish are actually present in the surf zone.

    When

    Surf · Small forage fish

    Moves up

    Run-and-gun cast

    Reviewed 2026-08-30

Where every sentence came from

Sources

Reviewed 2026-08-27, next review 2026-11-27. Each entry says which part of the page leans on it, so you can check the claim you care about rather than the whole list.

  1. Agency

    NOAA Fisheries, Atlantic Blacktip Shark species overview

    Used for habitat, thermal band and presentation families; identification; behaviour; forage; season. Read 2026-08-30, next check 2026-11-27.

  2. Agency

    NOAA Fisheries, Recreational Atlantic Shark Fishery Statuses, Minimum Sizes, and Retention Limits

    Used for habitat, thermal band and presentation families. Read 2026-08-27, next check 2026-11-27.

  3. Agency

    Florida Fish and Wildlife Conservation Commission, Sharks (shore-based permit, harvestable species groups, prohibited species)

    Used for habitat, thermal band and presentation families. Read 2026-08-27, next check 2026-11-27.

  4. Agency

    NOAA Fisheries, HMS Recreational Compliance Guide 2025 (permit, shark endorsement, circle hook rule)

    Used for habitat, thermal band and presentation families. Read 2026-08-27, next check 2026-11-27.

  5. Agency

    Federal Register, Atlantic Highly Migratory Species; Revisions to Commercial Atlantic Blacknose and Recreational Shark Management Measures (proposed rule, not yet final as of last check)

    Used for habitat, thermal band and presentation families. Read 2026-08-27, next check 2026-11-27.

  6. Agency

    NOAA Fisheries, Shark Identification for the Cooperative Shark Tagging Program (A-B species)

    Used for identification. Read 2026-08-30, next check 2026-11-20.

  7. Agency

    NOAA Fisheries, Shark Fin Identification Guide (NOAA Technical Memorandum)

    Used for identification. Read 2026-08-30, next check 2026-11-20.

  8. Peer reviewed

    Kajiura, S.M. and Tellman, S.L. 2016. Quantification of Massive Seasonal Aggregations of Blacktip Sharks (Carcharhinus limbatus) in Southeast Florida. PLOS ONE 11(3):e0150911

    Used for habitat, thermal band and presentation families; behaviour; season. Read 2026-08-30, next check 2026-11-27.

  9. Synthesis

    FRDC (Australian Fisheries Research and Development Corporation) Shark Report Card, Carcharhinus limbatus, citing IUCN Vulnerable status and November 2023 CITES Appendix II listing

    Used for habitat, thermal band and presentation families. Read 2026-08-27, next check 2026-11-27.

  10. Synthesis

    FRDC Shark Report Card, Carcharhinus limbatus (Australian stock; cited only for maximum size / age-at-maturity comparison, not as a western Atlantic figure)

    Used for identification. Read 2026-08-30, next check 2026-11-20.

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.