matrinchã-do-equador
Brycon alburnus · Bryconidae · omnivore
Matrinchã from the trans-Andean basins of Ecuador, up to 32.6 cm. It has commercial fishing and is nearly threatened, so it is best to release what you catch.
Also called: matrinchã-do-equador, matrinchã, dama montanea, sábalo
- maximum
- 33 cm
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.
Reading the weather across 3 global models and 31 simulations…
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hour by hour
tap or drag on the chart to read each hour · on a keyboard, arrow keyssee hour-by-hour table
why this index at —?
choose the day
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.
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 matrinchã-do-equador
who is the matrinchã-do-equador
The Ecuadorian matrinchã is a freshwater bryconid, reaching 32.6 cm standard length. It lives in the trans-Andean basins of Ecuador and spawns in schools among the plants during the rainy season. Like matrinchãs in general, it eats fruit and insects. It has commercial fishing and is considered nearly threatened, so releasing what is caught is best for the species. Dama montanea and sábalo are local names in Ecuador.
Essential profile. Identification, where it occurs and rules, with data from FishBase and the cited regulations. Season, time of day, technique and bait are added once we have a good source for the matrinchã-do-equador; in the meantime, see the similar species.
identification
Fusiform characin reaching 32.6 cm standard length, medium-sized, similar to the other matrinchãs. It can be confused with the Andean matrinchã, which also occurs in Ecuador. The maximum size of 32.6 cm is larger than that of the Andean, at 27.3 cm, which helps tell them apart.
where found
Trans-Andean basins of Ecuador. Does not occur in Brazil.
Habitat: Freshwater rivers of the trans-Andean basins, where schools gather among the plants in the rainy season.
rules for the matrinchã-do-equador
Summary of the regulations we found, with the source for each. 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.
catch and release
catch and release Releasing the fish alive, quickly and with a wet hand. During a closed season it isn't always allowed: what the regulation says applies.
Robust river fish: hold it with both hands, remove the hook and release it right away, supporting the body.
how much it weighs without taking it out of the water
Length-weight relationship W = a·Lb (a = 0.01413, b = 3.05; FishBase (relação peso-comprimento bayesiana, estimativa pelo gênero e formato do corpo)). It's an average: a fat or lean fish can vary by 10% to 20%.
estimated weight
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sources and references
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: Brycon alburnus (ficha da espécie)Size, length-weight, depth, habitat, distribution, biology, and IUCN status. Page checked on Oct 13, 2026.
- scientific FishBase: nomes populares de Brycon alburnusNames by country and language.
similar species
where 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: