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 crucian carp
how to recognize it
Freshwater carp with a fusiform body and a golden-greenish color, reaching 64 cm. It has no barbels, which sets it apart from the common carp. The last rays of the dorsal and anal fins are strong and slightly serrated. It is easily confused with Carassius gibelio, a very similar relative, and with the kinguio. It lives in lagoons and river arms with dense vegetation.
Also called: carpa-cruciana, carpín, crucian carp
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: Lagoons and river arms with dense vegetation, slow current, muddy bottom.
Native to Eurasia, in the basins of the North, Baltic, White, Barents, Black and Caspian seas, east to Siberia. In Chile, where it was introduced, it is exotic.
rules for the crucian carp
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 = 0.01349, b = 3.04; 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 crucian carp
Fish of the family Cyprinidae, reaching 64 cm and 3 kg. It is native to Eurasia, in the basins of the North, Baltic, White, Barents, Black and Caspian seas, east to Siberia. It lives in lagoons with dense vegetation and in arms of rivers with slow current, and tolerates low oxygen and cold. It eats plankton, bottom invertebrates, plants and detritus, and feeds all day, but mostly at night. It spawns in dense submerged vegetation, from May to June. It is commercially fished and sold fresh and frozen, and is also used as bait.
Family: Cyprinidae · omnivore
fun facts
- Each female lays 130,000 to 250,000 eggs, which stick to plants.
- In the dry season or in winter, it buries itself in the mud and can live up to 10 years.
in the kitchen
Sold fresh and frozen, and is usually fried, grilled or baked.
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: Carassius carassius (ficha da espécie)Size, length-weight, depth, habitat, distribution, biology, and IUCN status. Page checked on Oct 13, 2026.
- scientific FishBase: nomes populares de Carassius carassiusNames 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: