Mycteroperca bonaci · Epinephelidae · predator
Large, fast reef grouper. Endangered: recreational anglers catch and release only, with a closed season in August and September.
Also called: badejo-quadrado, sirigado (Nordeste), badejo
Choose the place and the species. The index, from 0 to 100, combines weather, sun, moon and tide with each fish's habits. Up to 28 days, with each day's confidence.
Reading the weather across 3 global models and 31 simulations…
Each card shows the day's index (0 to 100) and, below it, a strip with the index for each hour, from 0h to 23h. from poor to excellent.
Choose how many fishing days. We compare each stretch by its average index, discount days with a warning or closed season, and show the 3 best.
Line: the middle value of 31 simulations of the American GEFS model. Band: where 8 out of 10 fall. Narrow, firm trend; wide, high uncertainty.
The badejo-quadrado, called sirigado in the Northeast, is one of the largest groupers in the Atlantic, over 1.4 m and 60 kg. It lives on reefs, patch reefs, wrecks and deep rocky shores, usually at 20 to 100 m; juveniles stay in shallow areas and coastal reefs. It hunts fish and squid with fast strikes and is more active and mobile than the grouper, even chasing trolling baits. It forms spawning aggregations in winter, when it becomes very exposed. That is why it is Endangered on the national list and has its own rule: a closed season in August and September and, for recreational anglers, catch and release only. A strong, fast fight toward the rock.
More elongated than the goliath grouper, with a pointed head. Grey-olive to brown body with rectangular dark blotches forming a "square" pattern, and tan dots on the head and underside. Straight tail with a dark edge and white thread. Difference from the goliath grouper: longer body, straight tail and solid dark blotches, not pale. The goliath grouper is much thicker, with a broad head and rounded tail.
From Maranhão to Santa Catarina, most common on the reefs and patch reefs of the Northeast, Abrolhos, Espírito Santo, Rio de Janeiro and the north coast of São Paulo.
Habitat: Reefs, patch reefs, wrecks and deep rocky shores; juveniles on shallow coastal reefs.
coast
states
Maranhão, Piauí, Ceará, Rio Grande do Norte, Paraíba, Pernambuco, Alagoas, Sergipe, Bahia, Espírito Santo, Rio de Janeiro, São Paulo, Paraná, Santa Catarina
famous destinations
Winter spawning aggregations, protected by the closed season from August 1 to September 30. The best biological activity phase is in warm water, from late spring to autumn.
Daytime, with peaks at dawn and dusk. Hunts by day, peaking at dawn and dusk.
Cold water shuts down activity on the patch reefs of the Southeast.
Stable weather favors it; rough post-frontal sea gets in the way.
Moderate effect; spawning aggregations tend to follow the lunar cycle.
Not very relevant at sea.
Rough sea prevents fishing on the offshore reefs.
Wary of motors over the reef; make a long drift.
Strong wind gets in the way of drifting and vertical jigging.
Likes current: with the tide flooding or ebbing, it hunts at the edge of the offshore reef and in the front of the current. At slack tide, activity drops.
Adults from 20 to 100 m; young from 5 to 20 m.
lures
natural baits
accessories
Catch and release is mandatory. Use a circle hook, lock the drag, and don't let the fish reach the rocks. Release it with a descender.
Vertical fishing with metal jigs over reefs, wrecks and the shelf edge, from 30 to 150 m deep.
guideHow to read down imaging, side imaging and live sonar to find structure, confirm fish and get back to the right spot.
guideReleasing only counts if the fish survives. Right gear, little time out of water, proper handling, the right hook, care with barotrauma and revival against the current.
Summary of the regulations we found, with the source for each. Rules change; before keeping or transporting fish, check with the state environmental agency.
Conservation: The species was reclassified from VU (2022) to EN (2026). Recovery plan: Portaria Interministerial 59-C/2018.
Recreational and sport fishing of black grouper is allowed only as catch and release, in all Brazilian waters. Targeted fishing, transport, landing and trade outside the rules of the ordinance are prohibited. Spearfishing is not compatible with catch and release.
Source: Portaria Interministerial SG-PR/MMA nº 59-C/2018 (art. 2º, § 2º)
Fishing for black grouper is banned from Aug 1 to Sep 30, throughout its range. Trade during the period is allowed only with stock declared to Ibama by Aug 10.
Source: Portaria Interministerial SG-PR/MMA nº 59-C/2018 (art. 5º); Ibama report 2026
Authorized commercial fishing may only retain, transport and sell black grouper that are 60 cm or more in total length. It does not apply to recreational anglers, who must release all fish.
Source: Portaria Interministerial SG-PR/MMA nº 59-C/2018 (art. 3º)
The black grouper is on the national list of threatened species (Endangered, EN). Its use is only allowed under the terms of the recovery plan; Portaria GM/MMA 1.666/2026 ordered the plans and rules to be reviewed, and they remain in force during the review. Check for changes before fishing.
Source: Portaria GM/MMA nº 1.667/2026 and Portaria GM/MMA nº 1.666/2026 (art. 11)
Closed season for threatened reef fish whose use is regulated by the recovery plan (Portaria MMA 292/2018 and PI 59-C/2018). Period confirmed in the 2026 official closed-season calendar of Sema-BA. We could not read PI 59-C (sizes and recreational-angler rules). Black grouper (badejo-quadrado) moved to EN in the 2026 list, and the plan is under review.
Source: Portaria Interministerial SEAP-PR/MMA nº 59-C/2018; 2026 closed-season calendar of Sema-BA
Sirigado or badejo-quadrado (Mycteroperca bonaci, black grouper) moved from VU to EN on the 2026 list. Caranha (Lutjanus cyanopterus, cubera snapper) remains VU. Both have recognized use under Portaria MMA 292/2018, with rules in PI SEAP-PR/MMA 59-C/2018: closed season Aug 1 to Sep 30 and sizes we could not confirm. Because the black grouper moved up a category, the plan is under review (Portaria 1.666/2026, art. 11). If in doubt, release.
Source: Portaria MMA nº 292/2018; PI SEAP-PR/MMA nº 59-C/2018; Portaria GM/MMA nº 1.667/2026
Catch and release is mandatory for recreational anglers. Use a descender to return it to the bottom; don't puncture the swim bladder. Take a quick photo with the body supported horizontally.
Recreational fishing is catch and release only.
Length-weight relationship W = a·Lb (a = 0.0230633, b = 3.05; FishBase (estimativa bayesiana, comprimento total); coeficiente a ajustado ao porte máximo registrado). It's an average: a fat or lean fish can vary by 10% to 20%.
estimated weight
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The season weights (months), the time of day and the sensitivities (cold, pressure, moon, wind, rain, tide, strong light, murky water and noise) are the app's editorial estimates, based on the literature below and on the field experience of anglers and guides. They are not official data nor a measurement made for this species, and they may vary by region and year. Closed seasons and legal rules appear in the rules section, with the norm and a link.
The weather comes from three independent global models, cross-checked hour by hour: when they agree, confidence goes up; when they diverge, the band between them shows on the chart. Beyond 16 days, we use the GEFS ensemble of 31 simulations: if 20 of the 31 predict rain, the chance of rain is 65%. Sun and moon are calculated astronomically, with no uncertainty.
The index adds up, weighted for each species: time of day (species curve anchored to real sunrise and sunset), moon (transits, rise and set, phase), pressure (3 h trend and 24 h swing), water temperature (in rivers, estimated from air temperature; at sea, estimated by an ocean model), wind, rain, clouds, tide and the month in the species' cycle.
Accuracy measured in the reference project (4 regions, 93 days, forecast vs. observed): maximum temperature is off by 0.6 °C on average the next day and 1.7 °C at 7 days; rain of 5 mm or more is detected 76% of the time the next day and 57% at 7 days. Detection isn't everything: the false alarm rate isn't published here yet, and 93 days in 4 regions is still a small sample. We now also measure every day, at the app's destinations:
Your location is saved only on this device and feeds the forecast, the map and the "today" on the home page.
