Schizodon nasutus · Anostomidae · omnivore
The long-snouted piau of the Paraná reservoirs. Herbivorous, it nibbles dough and corn and fights well on a light rod.
Also called: timboré, timburé, taguara, chimboré, chimburé, ximboré, piau-de-cheiro, voga
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…
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.
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.
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.
A piau of the La Plata basin (Paraná, Paraguay and Uruguay), with a projecting snout that gives its scientific name (nasutus, big-nosed). It eats mostly plants and algae, and pairs spawn in dense vegetation. It is common in upper Paraná reservoirs, where it bites on corn and dough chum with cooked corn, and it has the federal minimum size for the Paraná basin. Common names vary a lot: in Minas, taguara and piau-de-cheiro; in São Paulo and Paraná, timboré, chimboré or timburé. In Mato Grosso, the chimburé in the state rule is another species (Schizodon borellii).
Elongated body, silvery to yellowish, with a long horizontal black mark on the tail base that extends onto the central rays. Projecting snout and mouth slightly below the tip, with incisor teeth. Yellowish fins. The piau-três-pintas has three round spots; the piau-flamengo has eight black bars.
La Plata basin: upper Paraná and tributaries (Grande, Paranaíba, Tietê, Paranapanema), Paraguay and Uruguay. Common in reservoirs.
Habitat: Reservoirs, eddies and banks with aquatic vegetation; sand and mud bottoms.
native to the basins
states
São Paulo, Minas Gerais, Paraná, Goiás, Mato Grosso do Sul, Mato Grosso, Santa Catarina, Rio Grande do Sul
famous destinations
Good from September to April; yields less in winter. During the spawning closure (piracema, Nov 1 to Feb 28) the Paraná basin closed season applies.
Daytime, with peaks at dawn and dusk. Active by day, with peaks early and late in the afternoon.
Strong cold leaves the school still.
A cold front stops the bites for a day or two.
Little effect.
Water starting to cloud after light rain can activate the fish.
Reservoir stable or slowly rising.
Bank fishing in silence produces more.
Little effect.
Shallow bottom, 0.5 to 3 m.
natural baits
accessories
Chum with corn and use a small hook hidden in the bait. Set the hook quickly at the first touch.
Summary of the regulations we found, with the source for each. Rules change; before keeping or transporting fish, check with the state environmental agency.
Conservation: Not on the national list (Portaria GM/MMA 1.667/2026).
Federal minimum size for timboré (taguara, Schizodon nasutus) in the Paraná basin. The stricter state rule prevails.
Source: Instrução Normativa Ibama nº 26/2009 (fishing rules for the Paraná River basin), Annex
Minimum size for taguara or piau-de-cheiro (Schizodon nasutus and S. knerii) in Minas Gerais.
Source: Portaria IEF-MG nº 111/2003 (IEF minimum size table)
Allowed: Recreational fishing only for non-native species and hybrids (peacock bass, tilapia, black bass, carp, croaker, etc.; piauçu remains prohibited), with handline, simple pole, or rod with spinning or baitcasting reel, up to 10 kg + 1 fish. In rivers, from shore only; in reservoirs, from a boat or from shore. Prohibited: floodplain lakes, aquatic-animal bait, within 1,500 m of dams and waterfalls, and within 500 m of confluences. Tournaments only in reservoirs and only with non-native species.
Source: IN IBAMA nº 25/2009
Allowed: Only exotic or hybrid species, 3 kg + 1 fish per day, with handline, rod, simple pole, or spinning or baitcasting reel. Nets prohibited. Keep the minimum distances from dams and reservoirs.
Source: Portarias IEF nº 154/2011 (São Francisco), 155/2011 (East) and 156/2011 (Grande/Paranaíba)
Allowed: Sport and guided fishing only in reservoirs, catch and release with barbless hooks (no keeping, transporting or eating). Subsistence: up to 5 kg per day, for household consumption only.
Allowed: Subsistence fishing by riverside residents and authorized scientific fishing. Decree 15.166/2019 (art. 11, §5) allows catch and release only in February and only in the channels of the Paraguay and Paraná rivers. For the rest of the period, not even catch and release is allowed. Check the Imasul portaria for each season.
Source: Decreto estadual MS nº 15.166/2019, art. 11; IN IBAMA nº 201/2008
Allowed: All fishing modalities are prohibited in rivers, including catch and release (Law 9.096/2009, art. 19-A). Exceptions: subsistence fishing from shore (3 kg or 1 fish, no transport or sale) and scientific fishing. Law 13.159/2025 now allows licensed sport fishing in UHE/PCH hydropower reservoirs, natural lakes and border rivers, subject to a scientific study and a license from the environmental agency. We have not confirmed whether these licenses are already being issued.
Allowed: Recreational fishing from shore, or from a boat without motor. Only handline or rod, line and hook, one gear per angler, up to 5 kg. Prohibited in floodplain lakes, within 1,500 m of dams, within 500 m of confluences, and in stretches listed in the rule (e.g., Turvo River).
Source: IN IBAMA nº 193/2008
Hardy fish: unhook it in the water and release it.
White, tasty flesh with bones; fried in pieces with fine scoring.
Length-weight relationship W = a·Lb (a = 0.01096, b = 3.09; FishBase). It's an average: a fat or lean fish can vary by 10% to 20%.
estimated weight
—
The season weights (months), the time of day and the sensitivities (cold, pressure, moon, wind, rain, tide, strong light, murky water and noise) are the app's editorial estimates, based on the literature below and on the field experience of anglers and guides. They are not official data nor a measurement made for this species, and they may vary by region and year. Closed seasons and legal rules appear in the rules section, with the norm and a link.
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.
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:
Your location is saved only on this device and feeds the forecast, the map and the "today" on the home page.
