Reef & bottom · Saltwater
Tautog
Tautoga onitis
Western Atlantic native, Nova Scotia and the Gulf of St. Lawrence to South Carolina; most abundant from Cape Cod to Delaware Bay.
Also called Blackfish.
- Inshore
- Nearshore
- 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 U.S. Atlantic coast, Massachusetts through Virginia, under the four ASMFC tautog stock units - check both the regional and the specific state rule, since they can differ within one region too.
The reviewed context, unedited
Managed solely by ASMFC - no federal fishery management council role was found in the sources reviewed - under a regional framework with four stock units (Massachusetts-Rhode Island, Long Island Sound, New Jersey-New York Bight, and Delaware-Maryland-Virginia), each carrying its own size, season and bag rules that are not uniform coastwide and that can vary by month within a single region (recreational minimum size runs about 15-16 in, but bag limits and open seasons differ region by region and state by state). The 2025 benchmark assessment found the Massachusetts-Rhode Island and Long Island Sound stocks not overfished and not subject to overfishing, the New Jersey-New York Bight stock subject to overfishing, and the Delaware-Maryland-Virginia stock both overfished and subject to overfishing - status is materially worse toward the southern part of the range. Illegal harvest for the live-fish market has been a persistent, documented enforcement problem: ASMFC's own FMP review cites a coastwide commercial harvest-tag return of only 31% in 2022, with roughly 13,000 issued tags unaccounted for, and a 2017 amendment created the tagging program specifically to address undocumented 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.
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 Tautog there are 13 of them.
Named by a reviewer
10Somebody looked for this and wrote down that they did not find it.
- Behaviour
Aggression/dominance behavior is only described in the context of spawning-group formation, not general feeding competition.
Cold-front (short-term barometric) response beyond the seasonal torpor threshold was not sourced.
Water-level, flow-change and clarity response were not sourced.
- Identification
A single continent-wide maximum weight was not found.
Typical weight-at-length was not sourced separately from length.
A reliable field trait list distinguishing tautog from cunner was not sourced in enough detail to include.
- Forage
Larval diet is described in the source as likely small copepods but unconfirmed.
A season-by-season adult diet shift beyond the general year-round shellfish pattern was not sourced.
- Season
Regional variation in the fall/spring temperature triggers (e.g., a report of southern Virginia fish active down to about 7C/45F) was noted but not fully reconciled into the calendar.
Nobody has sourced:
- early_spring, early_summer, late_summer and late_fall were not separately resolved in the sources reviewed and were folded into the adjacent season.
Absent from the record
3No reviewer wrote a gap here. The field is simply empty, which is its own answer.
- Water temperature
No agency or peer-reviewed temperature band for Tautog was found that a review would accept. The reading runs without one rather than borrowing a number from a related fish.
- 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- Oyster bar
- Grass flat
Nearshore
5 reviewed holding classes- Nearshore reef
- Artificial reef
- Wreck
- Rock pile
- Pier structure
DepthStructure- and season-dependent rather than a fixed depth. In summer, adults move inshore into shallow structured habitat alongside juveniles; in fall, adults migrate to deeper, more rugged offshore bottom (roughly 25-45 m / 80-150 ft) once bottom temperature drops below about 10C/50F, though some overwinter inshore, especially in northern parts of the range. Juveniles generally stay inshore year-round.
Moving waterNot sourced as a tide-stage relationship. What is sourced is a structure relationship: tautog occupy whatever complex cover is available - natural and artificial reefs, rock outcrops, shellfish beds, and man-made structure such as pilings, jetties, groins and wrecks - and cover availability, not tide, is described as the single most important habitat parameter for the species.
LightStrongly diurnal. Sourced as most active in the first hour of daylight, tapering by mid-morning, feeding by sight through the day, and settling into an inactive, low-responsiveness rest state in shelter at night - described in the source as a true rest/sleep state, not simple inactivity.
Thermal band
Temperature
No reviewed temperature band
Nobody publishes a preferred or active temperature range for Tautog that a review would accept. Borrowing one from a related fish would look like knowledge and behave like a guess, so the reading runs without it and says which parts of the answer that weakens.
How it uses water
Behaviour
Not a schooling species; several fish sharing one piece of structure are using the same cover, not travelling together. Some adult mixing across populations is reported at spawning.
A durophagous (shell-crushing) sight feeder: pharyngeal teeth crush shellfish and anterior teeth tear prey from the substrate. Feeds by 'scan-and-pick' through the day, chiefly on blue mussels and other hard-shelled prey year-round.
Strongly diurnal: highest activity in the first hour of daylight, tapering by mid-morning, feeding by sight from soon after sunrise to evening twilight, and a true rest/low-responsiveness state in shelter overnight (fish have been described as touchable by divers at night).
Seasonal activityFeeding slows sharply in cold water and stops in torpor below about 6C/43F; tautog can reportedly go without food for up to six months in winter, living on stored liver reserves.
Temperature-driven behaviourTemperature directly triggers the season's structure use: the fall offshore migration begins as bottom temperature drops below about 10C/50F, spring inshore movement begins around 11C/52F or above, and optimal feeding is reported near 19-21C/66-70F, declining above roughly 28.7-33.0C/84-91F, with torpor below about 6C/43F.
Depth movementSeasonal rather than diel: shallow structured water in the warm months, deeper rugged offshore bottom in winter once the fall temperature trigger is crossed; juveniles stay in shallow water essentially year-round.
CoverThe single most important habitat factor sourced for this species: submerged vegetation, shellfish beds, rock, and natural or artificial reef and structure (pilings, jetties, groins, wrecks) at a scale matched to the fish's size - juveniles need small crevices, adults use larger structure.
Predator avoidanceReliance on crevice/cover shelter, both for the nightly rest state and, in juveniles, for daytime refuge; the species is described as extremely local, with position relative to cover mattering at a scale of a few feet.
TerritoryHomesite-based rather than broadly territorial: individuals, especially juveniles, use a small home shelter, ranging out to feed (up to roughly 500 m from the homesite in one study) and returning to it, including nightly, rather than roaming widely or holding a large exclusive territory.
Spawning (conservation context)A prolonged batch spawner, April-July and peaking around June-July, beginning once bottom water reaches about 9C/48F and peaking near 11-12C/52-54F. Spawns in heterosexual pairs or small groups near estuarine mouths and inshore/nearshore waters, with some documented offshore spawning on hard bottom in deeper water off Maryland/Virginia. This is conservation context only; no spawning site or concentration is targeted in this catalog.
Where the general rule stops
- Tautog show strong homesite fidelity, especially as juveniles, ranging only a short distance from a home shelter by day and returning to it at night. This is recorded here as biology, not as a way to find or return to a specific concentration of fish; this record names no reef, wreck or location, and we never give one.
- Illegal harvest and undersized-fish sale to the live-fish market is a real, monitored enforcement problem for this species (see targetContext). This record is written so that it does not make locating a concentration of fish easier, and should not be read as doing so.
- Winter cold triggers a torpor state below about 6C/43F, with an apparent lethal threshold near 2.1C/36F in the lab/field synthesis reviewed. This is a physiological limit, not a fishing recommendation, and southern populations (e.g. Virginia) have been reported active at temperatures well below this, so it should not be read as a fixed species-wide cutoff.
What it can eat
Forage
- Mollusks
- Crustaceans
- Zooplankton
Adults are durophagous, feeding chiefly on blue mussels and other shellfish year-round, plus barnacles, crabs, hermit crabs, sand dollars, scallops and gastropods; pharyngeal teeth crush the shell and anterior teeth tear prey free. This is diet capacity, not a current bait event.
- Feeding style
- Specialized
- Feeding zone
- Benthic
Through the year
- Winter
- Feeding slows sharply and stops below about 43F (torpor); the species can reportedly go without food for months, living on stored liver reserves.
- Summer
- Optimal feeding temperature (about 66-70F) falls in this window; the year-round mussel/shellfish diet is at its most active.
By life stage
- Young of year
- Planktonic copepods and amphipods dominate (amphipods found in 98% of early juveniles by frequency of occurrence).
- Juvenile
- Gradual shift from planktonic prey to benthic prey, moving onto small mussels by around 120 mm length.
- Adult
- Durophagous - chiefly blue mussels and other shellfish, plus barnacles, crabs and other hard-shelled invertebrates.
Prey sizePrey shifts from small planktonic crustaceans in early juveniles to small mussels around 120 mm length and larger hard-shelled prey as adults.
Ontogenetic shiftPlanktivory (copepods, amphipods) as young-of-year, shifting to benthic durophagy (mussels and other shellfish) by adulthood.
Diet capacity is not proof of a current feeding event. Observed current forage still comes from a user observation or Hatch Match.
Through the year
Season
Spring
- Where they sit
- Inshore structure as adults return from deeper winter grounds once bottom water reaches about 11C/52F.
- Movement
- Inshore migration triggered by temperature, not calendar date.
What that changesStructure pitch and bottom contact become viable as fish reoccupy shallow structure.
What would count against it
- treating a fixed spring date as the trigger instead of the sourced temperature threshold
Spawning begins in this window (from about 9C/48F) and continues into summer; conservation context only.
Summer
- Where they sit
- Shallow inshore and nearshore structure - reefs, rock, shellfish beds, pilings, wrecks - shared by adults and juveniles.
- Depth
- Shallow, structure-bound.
- Temperature
- Optimal feeding reported near 19-21C/66-70F; feeding declines above roughly 84-91F.
- Cover
- The dominant habitat driver: crevice- and structure-scale cover for both juveniles and adults.
- Light
- Strongly diurnal - active from soon after sunrise, resting motionless in shelter at night.
What that changesStructure pitch, bottom contact, and drop presentation into structure.
What would count against it
- fishing this species away from hard or shellfish structure - open sand/mud is not sourced holding water for it
- reading homesite fidelity as a way to relocate a specific concentration of fish
Fall
- Where they sit
- Transition from shallow inshore structure to deeper, more rugged offshore structure.
- Movement
- Offshore migration begins once bottom temperature drops below about 10C/50F; some fish, especially in northern areas, overwinter inshore instead.
What that changesBottom contact and structure vertical as fish concentrate on deeper structure.
What would count against it
- assuming every fish makes the offshore move - some inshore overwintering is documented
Winter
- Where they sit
- Deeper, rugged offshore structure (roughly 80-150 ft) for the offshore contingent; shallow inshore structure for fish that overwinter there.
- Temperature
- Torpor below about 6C/43F; feeding effectively stops.
A resting, non-feeding population for much of this window - not a fishing target regardless of local rules.
Spawning · Spring, Early summer, Summer
A batch spawner with a prolonged season, April through July and peaking around June-July, progressing northward as water warms. Spawning begins once bottom temperature reaches about 9C/48F, peaking near 11-12C/52-54F, in heterosexual pairs or small groups. Spawning sites and any staging concentration are excluded from targeting in this catalog.
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
- Heavy, blunt head with thick lips built for crushing shellfish.
- No scales on the gill cover, unlike most inshore sport fish of similar size.
- Dark, mottled coloration overall - the source of the regional name 'blackfish'.
- Juveniles and females tend toward a mottled, brown-toned pattern; males tend toward plainer gray.
- Average adult length
- Size at maturity runs 7-12 in depending on region; documented adult lengths in tagging studies reached up to about 27 in (685 mm) in Rhode Island and about 20 in (516 mm) in Virginia.
- Common angling size
- Regional recreational minimum sizes run about 15-16 in, which brackets the common keeper range.
- Typical weight
- Not sourced as a figure distinct from length in the material reviewed.
- Maximum documented
- Up to about 27 in (685 mm) in a Rhode Island tagging study; the same body of work found a smaller regional maximum in Virginia (about 20 in / 516 mm), indicating real geographic variation rather than one species-wide figure.
- Longevity
- Not sourced with a specific maximum-age figure. Sexual maturity is reached at age 3-4 (some fish at age 2).
What it gets confused with
- Cunner (Tautogolabrus adspersus)
- A smaller, closely related wrasse sharing the same structure habitat; noted here as a common field confusion, but a sourced list of distinguishing traits was not found this session.
What follows from all of that
Presentation families
Inshore
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
Live / natural bait suspension
Present a natural food form with enough life or scent to hold in a station without looking mechanical.
- keep it alive or fresh
- match the holding depth
- minimize hardware bulk
- detect without pulling it away
What it asks of the tackle
- Depth control
- High
- Sensitivity
- High
- Casting distance
- Short to moderate
- Weight range
- As light as conditions allow
- Cover resistance
- Moderate
- Line visibility
- Low
- Retie frequency
- High
Nearshore
Bottom contact
Keep a bait on or just above the substrate along a break, flat, or inside a weed edge.
- feel bottom
- drag or hop
- pause on the break
- stay in contact
What it asks of the tackle
- Depth control
- High
- Sensitivity
- High
- Casting distance
- Moderate
- Weight range
- 1/8–1/2 oz
- Cover resistance
- High
- Line visibility
- Low
- Retie frequency
- High
Drop presentation
Let a bait fall on a controlled line into cover, along a wall, or through a hole in vegetation.
- place then fall
- watch the line
- hold at depth
- short hop only after the fall
What it asks of the tackle
- Depth control
- High
- Sensitivity
- High
- Casting distance
- Short
- Weight range
- 1/16–3/8 oz
- Cover resistance
- High
- Line visibility
- Low
- Retie frequency
- High
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.
As bottom temperature drops below the documented fall migration trigger, tautog move off shallow structure onto deeper, more rugged bottom, so working the column tight over that deeper relief and dragging bottom fit better than a shallow-water pitch-and-drop into structure.
When
Nearshore · Fall
Moves up
Structure vertical, Bottom contact, Drop presentation
Reviewed 2026-08-30
In the warm months tautog and juveniles share shallow, crevice-scale structure, and the reviewed summer presentation set adds a dropped presentation into that structure that the fall entry drops in favor of deeper vertical work.
When
Nearshore · Summer
Moves up
Drop presentation, Bottom contact
Reviewed 2026-08-30
Where every sentence came from
Sources
Agency
NOAA Technical Memorandum (NEFSC), Tautog (Tautoga onitis) Life History and Habitat Requirements
Used for habitat, thermal band and presentation families; identification; behaviour; forage; season. Read 2026-08-30, next check 2026-11-27.
Agency
Atlantic States Marine Fisheries Commission - Tautog species page
Used for habitat, thermal band and presentation families; identification; behaviour; forage; season. Read 2026-08-30, next check 2026-11-27.
Agency
Atlantic States Marine Fisheries Commission - Approved Tautog FMP Review for FY2022
Used for habitat, thermal band and presentation families; identification; behaviour; forage; season. Read 2026-08-30, next check 2026-11-27.
Agency
New York State DEC, Species Status Assessment: Tautog (SWAP 2025)
Used for habitat, thermal band and presentation families; identification; behaviour; forage; season. Read 2026-08-30, next check 2026-11-27.
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.