Pimelodus ornatus · Pimelodidae · predator
A silver catfish with flanks marked by dark bands and blotches, from large rivers in the Amazon, the Araguaia-Tocantins and the Pantanal. Active at dusk, it grunts when it leaves the water and stings anyone who handles it carelessly.
Also called: mandi-cabeçudo, bagre-cabeçudo, cabeçudo, mandi-guaru, mandi-pinima
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 medium-sized catfish of the family Pimelodidae, widely distributed in the Amazon, the Orinoco, the Guianas and the Plata basin. According to FishBase, it lives on the bed of main rivers, in headwaters, in riffles downstream, in backwaters and in deep rocky pools with fallen logs; it is active at dusk and eats mostly fish. It makes loud grunts when taken out of the water, and its skin releases a toxic mucus; the stings from its pectoral spines hurt badly. It was one of the fish of the lower Paraná that moved upriver after the Itaipu reservoir covered the Sete Quedas falls in 1982, and it now occurs in the upper Paraná, where Goiás treats it as allochthonous. It has commercial use and appears in Tocantins' size table, a sign that it is caught in the region. Mandi-guaru, mandi-pinima and bagre-cabeçudo are names of the same species.
A scaleless catfish with an elongated, slightly compressed body, a broad head (hence cabeçudo, 'big-headed') and three pairs of barbels. The flank is silver to gray, with a pattern of dark bands and blotches that explains the names bagre fajado, in Argentina, and pinima (spotted), in Tocantins; the belly is pale. Strong serrated spines on the dorsal and pectoral fins, a small adipose fin and a forked tail. The mandi-prata (Pimelodus blochii) is silver to gray, sometimes with spots, and the mandi-amarelo (P. maculatus) has rows of round spots on a yellowish background. Among Pimelodus, reliable separation requires counts and is difficult in the field.
Large rivers of the Amazon basin, the Araguaia-Tocantins and the Pantanal (Paraguay basin). Outside Brazil it also occurs in the Orinoco, the Guianas and the lower Paraná. It reached the upper Paraná after the closing of Itaipu in 1982, and Goiás lists it as allochthonous in the Paranaíba.
Habitat: Bed of large rivers, backwaters, downstream riffles and rocky-bottomed pools with fallen logs; also channels, tributaries and floodplain lakes left after the flood.
native to the basins
introduced in
states
Amazonas, Pará, Mato Grosso, Mato Grosso do Sul, Tocantins, Goiás
Year-round. In the Amazon and the Araguaia-Tocantins it produces best during falling water and the dry season, with fish concentrated in channels and pools; in the flood it spreads across the floodplain.
Night and twilight. FishBase describes it as active at dusk. It produces from late afternoon into early evening; by day it stays sheltered among logs and pools.
Cold fronts reduce bites, especially in the Pantanal and the upper Paraná.
Little known effect.
Bank anglers often prefer dark nights; the effect is small.
When the water starts to cloud, it often activates the school.
A falling river concentrates fish in channels and pools; in the flood it spreads across the floodplain.
Not very sensitive.
Little effect.
Bottom, 1 to 6 m, in backwaters and pools.
natural baits
accessories
Bait on the bottom, near logs and banks, from late afternoon until night. Since FishBase lists it as a fish eater, a piece of fresh fish is a good bet. Hold it behind the spines.
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 Brazilian national list (Ministerial Ordinance GM/MMA No. 1.667/2026).
In Tocantins the mandi-guaru or mandi-pinima (Pimelodus ornatus) may only be kept at 20 cm or more and up to 40 cm. Anything longer goes back into the water.
Source: Portaria Naturatins nº 47/2026, as amended by Portaria nº 105/2026, Annex I
In Tocantins, mandi-guaru over 40 cm must be returned to the water.
Source: Portaria Naturatins nº 47/2026, as amended by Portaria nº 105/2026, Annex I
In the Paranaíba basin in Goiás, the mandi-cabeçudo (Pimelodus ornatus) is on the list of allochthonous species, with its origin attributed to Itaipu, and may be caught, killed and transported without size or quantity limits. Fish from this catch may not be sold or processed, and a fishing license is still required.
Source: Instrução Normativa Semad-GO nº 17/2026, art. 5º and Annex II (Paranaíba basin)
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 only in reservoirs, with handline, rod, or spinning or baitcasting reel. Fish may only be eaten on site, not transported. Competitions prohibited. Subsistence: 3 kg + 1 fish. State rules (GO and TO) may be stricter.
Allowed: Recreational fishing only in reservoirs, with on-site consumption. Subsistence: 5 kg + 1 fish. State rules may be stricter.
Allowed: In 2025/26: catch and release with barbless hooks and recreational fishing card; subsistence fishing on foot or from a rowboat, with simple pole or handline.
Source: Portaria Naturatins nº 244/2025 (2025/26 season); INIs MPA/MMA nº 12 and 13/2011
Allowed: The same recreational-angler exceptions as in Portaria 48/2007 apply (handline or rod, 5 kg + 1 fish), unless a stricter state rule applies.
Source: Portaria IBAMA nº 48/2007
Allowed: Recreational anglers with handline or rod, line and hook are outside the Annex II prohibitions, with a bag limit of 5 kg + 1 fish, unless a stricter state rule applies.
Source: Portaria IBAMA nº 48/2007
Allowed: Subsistence fishing only.
Source: Portaria IBAMA nº 48/2007
Allowed: See the exceptions in Portaria 48/2007 and the state rules for each bank.
Source: Portaria IBAMA nº 48/2007
Hold it behind the pectoral spines, with a damp cloth or pliers, and keep away from the mucus: it is toxic. Remove the hook quickly and release it in the water.
A small leather catfish (bagre de couro) with commercial use in artisanal fishing (FishBase). It can be prepared like mandi: fried whole or in broth.
Length-weight relationship W = a·Lb (a = 0.01047, b = 3.1; 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
—
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.
