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.
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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 rivulated mutton hamlet
how to recognize it
Smooth scales, rounded caudal fin and an eye slightly larger than the snout. Body depth is much less than head length. The rear edge of the preopercle is serrated, and a large spine covered in skin projects from the corner. Compare it with the Pacific coral grouper (Alphestes immaculatus), which has an eye almost the same size as the snout and a marbled reddish-brown body.
Also called: garoupinha-listrada, garoupinha, guaseta rayada, Rivulated mutton hamlet
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 reefs and shallow water, down to 30 m.
Lives in the eastern Pacific, from the Gulf of California to Peru.
when to fish
best time of day
Nighttime. It is nocturnal: by day it stays still among algae or hidden in crevices, and at night it hunts crustaceans on the bottom.
rules for the rivulated mutton hamlet
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.
how much it weighs without taking it out of the water
estimated weight
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how we calculate
Length-weight relationship W = a·Lb (a = 0.01122, b = 3.04; FishBase (relação peso-comprimento bayesiana, estimativa)). It's an average: a fat or lean fish can vary by 10% to 20%.
more about the rivulated mutton hamlet
The striped small grouper belongs to the family Epinephelidae and reaches 30 cm. It lives on rocky reefs and in shallow water of the eastern Pacific, from the Gulf of California to Peru, at depths of up to 30 m. It is sedentary: by day it hides in crevices or among algae, and sometimes covers itself with sand. At night it hunts crustaceans on the bottom. Body depth is much less than head length, and the eye is slightly larger than the snout. It has no interest for anglers.
Family: Epinephelidae · predator
fun facts
- It relies on camouflage to avoid being noticed and sometimes partly covers itself with sand.
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: Alphestes multiguttatus (ficha da espécie)Size, length-weight, depth, habitat, distribution, biology, and IUCN status. Page checked on Oct 13, 2026.
- scientific FishBase: nomes populares de Alphestes multiguttatusNames 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: