toothed flounder
Cyclopsetta querna · Cyclopsettidae · predator
Pacific flounder that lives on soft bottoms near mangroves, from Mexico to Peru. It appears as incidental catch and may be sold fresh.
Also called: linguado-dentado, lenguado dentón, lenguado zapata, toothed flounder
- maximum
- 39 cm
- depth
- 0–30 m
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 toothed flounder
who is the toothed flounder
Flatfish of the family Cyclopsettidae, with a flattened body and both eyes on the left side of the head. Males reach 39 cm, and females may reach 43.2 cm. Its common size is 25 cm. It lives on soft bottoms near mangroves and down to 29 m deep, from the Gulf of California to Peru. It eats large bottom invertebrates and small fish. It has little commercial value, but is used fresh. It poses no danger to anglers.
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 toothed flounder; in the meantime, see the similar species.
identification
Flattened flatfish, with both eyes on the left side of the head, like the other flatfish of the family Cyclopsettidae. The common name refers to the teeth in its mouth. It reaches 39 cm, much larger than the small sand flounder (Citharichthys platophrys), which reaches 20.6 cm. It lives on soft bottoms near mangroves, and on the same coast size is the first difference to watch for.
where found
Eastern Pacific of Latin America, from the Gulf of California to Peru, on soft bottoms near mangroves.
Habitat: Soft bottoms of coastal areas, near mangroves, down to 29 m deep.
rules for the toothed flounder
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.
It has no spines or venom, but it has teeth. Hold it carefully when removing the hook and release it quickly if it is going back to the water.
in the kitchen
Used fresh, and has little commercial value.
how much it weighs without taking it out of the water
Length-weight relationship W = a·Lb (a = 0.00661, b = 3.13; 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: Cyclopsetta querna (ficha da espécie)Size, length-weight, depth, habitat, distribution, biology, and IUCN status. Page checked on Oct 13, 2026.
- scientific FishBase: nomes populares de Cyclopsetta quernaNames 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: