bay snook
Petenia splendida · Cichlidae · predator
Large cichlid from rivers and lakes of Mexico, Guatemala and Belize, reaching 50 cm and caught commercially.
Also called: ciclídeo-gigante, tenguayaca, giant cichlid, bay snook
- maximum
- 50 cm
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 bay snook
who is the bay snook
Cichlid of the family Cichlidae reaching 50 cm, large for its group. It occurs in freshwater of the Grijalva-Usumacinta system, in Mexico, Guatemala and Belize. It lives in lakes and in the lower and middle reaches of rivers, where the water flows slowly, over sand and mud bottoms. It stays near the bottom and feeds on fish, so it is a predator. In Mexico it is called tenguayaca, and in Belize, blanco. It is caught commercially throughout its range.
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 bay snook; in the meantime, see the similar species.
identification
Freshwater fish predator, reaching 50 cm. Size is the main clue: the other cichlids of the region's Atlantic slope, such as Cribroheros robertsoni, which reaches 19 cm, and Vieja bifasciata, which reaches 30 cm, are much smaller. It prefers calm waters, with sand and mud bottoms, where it stays near the bottom.
where found
Freshwater of Mexico, from the Grijalva to the Usumacinta basin, and of Guatemala and Belize, in lakes and slow-flowing rivers.
Habitat: Lakes and lower and middle reaches of rivers, in calm water, with sand and mud bottoms.
rules for the bay snook
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 poses no danger to anglers, but the fin spines can prick the hand. Because it is large, handle it with both hands, with a wet hand, and release it carefully.
how much it weighs without taking it out of the water
Length-weight relationship W = a·Lb (a = 0.02188, b = 3.03; 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: Petenia splendida (ficha da espécie)Size, length-weight, depth, habitat, distribution, biology, and IUCN status. Page checked on Oct 13, 2026.
- scientific FishBase: nomes populares de Petenia splendidaNames 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: