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 longnose dace
how to recognize it
Elongated fish with a long snout that overhangs the mouth. There is no groove between the upper lip and the tip of the snout, and there is a barbel near the mouth. It forms schools in currents and tends to stay near the bottom, among rocks and gravel of fast rivers. To tell it apart from other small carps, look at the long snout and the barbel.
Also called: carpa-de-focinho-longo, carpita rinconera, longnose dace
We don't have tips on season, bait or technique for this species yet.
where found
open on the large mapWhere to look: Gravel and stone riffles in fast streams and small to medium rivers.
Native to North America and, in Latin America, to northern Mexico, in the Rio Grande basin. It is not recorded in Brazil.
rules for the longnose dace
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 = 0.00724, b = 3.15; 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 longnose dace
Freshwater fish of the family Leuciscidae, reaching 22.5 cm. It lives in gravel and stone riffles of fast streams and small to medium rivers, and also along rocky lake margins. Adults form schools and eat insects, such as mayflies, black flies and small midges. They spawn over stones and gravel. In fishing, it is widely used as bait in the United States. It occurs in North America, north of 40 degrees north latitude, and in northern Mexico, in the Rio Grande basin.
Family: Leuciscidae · forage fish
fun facts
- Juveniles are pelagic for up to four months before they begin living on the bottom.
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: Rhinichthys cataractae (ficha da espécie)Size, length-weight, depth, habitat, distribution, biology, and IUCN status. Page checked on Oct 13, 2026.
- scientific FishBase: nomes populares de Rhinichthys cataractaeNames 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: