the right time
to be on the water
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.
Loading the forecast…
—
hour by hour
slide your finger or mouse over the chart to see each hoursee hour-by-hour table
why this index at —?
choose the day
the fishing month at a glance
what's the best window for the crew?
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.
trend for the coming weeks
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.
everything about the sailfin grouper
how to recognize it
Adults dark brown to olive-brown, with purplish and light brown blotches, or simply dark brown. There is a fully bright-yellow variation. Adults have posterior nostrils much larger than the anterior ones, and the preopercle has a serrated lobe at the corner. The location helps identify it: it occurs only at the Galápagos, Cocos Island and Malpelo. Compare with the olive grouper (Hyporthodus cifuentesi), which lives on the same islands but is light brown with a greenish sheen.
Also called: badejo-de-vela, badejo, garropa parda, sailfin grouper
don't confuse with:
We don't have tips on season, bait or technique for this species yet.
where found
open on the large mapWhere to look: Rocky cliffs and lava reefs, from 15 to 40 m; juveniles stay in shallow lagoons.
It lives only on islands of the eastern Pacific: the Galápagos (Ecuador), Cocos Island (Costa Rica) and Malpelo (Colombia). Records from Panama and Peru were discarded.
rules for the sailfin grouper
Rules change; before keeping or transporting fish, check with the state environmental agency.
We found no species-specific rule beyond the region's general rules.
IUCN global: EN · endangered.
how much it weighs without taking it out of the water
estimated weight
—
how we calculate
Length-weight relationship W = a·Lb (a = 0.00603, b = 3.02; FishBase (relação peso-comprimento bayesiana, estimativa da própria espécie)). It's an average: a fat or lean fish can vary by 10% to 20%.
more about the sailfin grouper
The badejo-de-vela belongs to the family Epinephelidae and reaches 120 cm. It lives in the eastern Pacific, at the Galápagos, Cocos Island and Malpelo, on rocky cliffs and lava reefs, usually between 15 and 40 m deep. Juveniles stay in shallow sandy lagoons, seagrass beds and mangrove lagoons. Adults eat mainly fish, and the size of prey grows with the predator. It is caught commercially. It is threatened, so the focus should be on recognizing it and releasing it.
Family: Epinephelidae · predator
similar species
sources and references (2)
Essential profile: size, length-weight, depth, countries and conservation come from FishBase and the cited regulations, and the texts were written from those sources. Season, time of day, sensitivities, technique and baits and lures are not included yet, because we did not find a good source for this species.
- scientific FishBase: Mycteroperca olfax (ficha da espécie)Size, length-weight, depth, habitat, distribution, biology, and IUCN status. Page checked on Oct 13, 2026.
- scientific FishBase: nomes populares de Mycteroperca olfaxNames by country and language.
how we calculatewhere each number comes from
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.
sources for this lookup
how accurate the forecast is
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: