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 smooth-cheek eartheater
how to recognize it
Cichlid with a body compressed sideways and a spiny dorsal fin, of the cará group. The scientific name, gymnogenys, and its common names in other languages point to the smooth cheeks. It can be confused with the cará (Geophagus brasiliensis), another bottom-dwelling cichlid that also occurs in the South, so check the cheeks and the fishing location.
Also called: cará-de-bochecha-lisa, cará, castañeta, smooth-cheek eartheater
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: Warm waters, between 21 and 24 degrees, near the bottom and in midwater.
Occurs in Brazil and Uruguay. In Brazil, there are records in Rio Grande do Sul, in the Uruguay River and in the rivers that flow into the Patos lagoon and the coast.
native to the basins
rules for the smooth-cheek eartheater
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.
piracema and closed seasons
Each bar is the period when fishing is prohibited or restricted. The green line is today. Tap the name to see what is still allowed.
Spawning closure (piracema) in the Uruguay River basin
Allowed: Recreational fishing from shore, or from a boat without motor. Only handline or rod, line and hook, one gear per angler, up to 5 kg. Prohibited in floodplain lakes, within 1,500 m of dams, within 500 m of confluences, and in stretches listed in the rule (e.g., Turvo River).
Source: IN IBAMA nº 193/2008
Spawning closure (piracema) in the southern basins (RS and SC, outside the Uruguay)
Allowed: Recreational fishing from a boat or from shore, with a single hook, one gear per angler, up to 5 kg.
Source: IN IBAMA nº 197/2008
Conservation: Not on the Brazilian national list (Ministerial Ordinance GM/MMA No. 1.667/2026).
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 = 0.01778, b = 2.97; 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 smooth-cheek eartheater
The cará-de-bochecha-lisa is a cichlid of the family Cichlidae, of the genus Gymnogeophagus, a group of caras that live near the bottom. It reaches 15 cm standard length. It occurs in Brazil and Uruguay, in warm waters, between 21 and 24 degrees. Eggs are laid on the substrate and covered with sand. The female guards the brood and takes the larvae into her mouth after hatching. The male may mate with more than one female. It has commercial use and is sold for the aquarium.
Family: Cichlidae · omnivore
fun facts
- The female carries the larvae in her mouth after hatching.
similar species
sources and references (3)
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: Gymnogeophagus gymnogenys (ficha da espécie)Size, length-weight, depth, habitat, distribution, biology, and IUCN status. Page checked on Oct 13, 2026.
- scientific FishBase: nomes populares de Gymnogeophagus gymnogenysNames by country and language.
- official Portaria GM/MMA nº 1.667, de 27 de abril de 2026: Lista Nacional Oficial de Espécies da Fauna Ameaçadas de Extinção (peixes e invertebrados aquáticos)The species is not on the list. Checked in the DOU of April 28, 2026.
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: