tench
Tinca tinca · Tincidae · omnivore
Thick, dark fish native to Eurasia, popular among amateur anglers. It reaches 70 cm and was introduced to Chile.
Also called: tenca, tench
- maximum
- 70 cm
- record/max.
- 7.5 kg
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 tench
who is the tench
Fish of the family Tincidae (tench), freshwater and sometimes brackish, reaching 70 cm and weighing up to 7.5 kg. It lives in shallow lakes and ponds with abundant vegetation and a mud bottom, and also in still-water rivers. It tolerates low oxygen and usually spends the winter buried in the mud. It eats detritus, bottom animals and plants, and adults eat many mollusks. It is popular with amateur anglers. It was introduced to Chile, where it is exotic, and is highly prized as food.
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 tench.
fun facts
- It serves as food for predatory fish, and that is why it is used as forage.
identification
Thick, heavy fish, laterally compressed, with a short, deep caudal peduncle. The skin is thick and slimy, and the scales are small and embedded. The color is olive green, sometimes dark green or nearly black, with golden reflections on the belly. It has a triangular head, a small reddish-orange eye, and a pair of well-developed barbels, one at each corner of the mouth.
where found
Native to Eurasia and introduced to Chile, where it is exotic. Not recorded in Brazil.
Habitat: Shallow lakes and ponds with abundant vegetation and mud bottoms, and still-water rivers.
rules for the tench
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.
Harmless fish, but its skin is slippery: hold it firmly by the body, with a wet hand, and return it to the water quickly.
in the kitchen
It is highly prized as food, and the flesh is eaten fried, grilled, baked or frozen.
how much it weighs without taking it out of the water
Length-weight relationship W = a·Lb (a = 0.01122, b = 3.02; FishBase (relação peso-comprimento bayesiana, estimativa da própria espécie)). 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: Tinca tinca (ficha da espécie)Size, length-weight, depth, habitat, distribution, biology, and IUCN status. Page checked on Oct 13, 2026.
- scientific FishBase: nomes populares de Tinca tincaNames by country and language.
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: