white bass
Morone chrysops · Moronidae · predator
Freshwater fish of the Great Lakes and the Mississippi basin in the United States, introduced to Mexico, where it is exotic. It reaches 45 cm and is caught on rod and line.
Also called: robalo-branco, white bass
- maximum
- 45 cm
- record/max.
- 3.1 kg
- depth
- 0–13 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 white bass
who is the white bass
The white bass is a freshwater fish of the family Moronidae, reaching 45 cm and weighing up to 3.1 kg. It lives in lakes, ponds and pools of small to large rivers, in temperate water, between 12 and 32 degrees, and down to 13 m deep. Young ones eat small invertebrates, such as cladocerans, copepods and mosquito larvae. Adults eat fish and, sometimes, young of other freshwater fish. It spawns near the surface. It has sport value and is caught for subsistence.
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 white bass; in the meantime, see the similar species.
identification
Fusiform, long-bodied fish with two dorsal fins, the front one spiny, a trait of the family Moronidae. It lives in lakes, ponds and river pools, in shallow waters. The name refers to the light tone of the body. To tell it apart from the yellow bass, of the same genus and region, look at the body tone, which in this species is light and silvery.
where found
Native to the United States, from the Great Lakes basin to the Gulf, and introduced to Mexico, where it is exotic. Not recorded in Brazil.
Habitat: Lakes, ponds and pools of rivers, in shallow water, down to 13 m deep.
rules for the white bass
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. Hold it with a wet hand and return it quickly to the water. As it is exotic in Mexico, do not release it in waters where it does not occur.
in the kitchen
It is caught for subsistence, that is, for the consumption of the people who catch it.
how much it weighs without taking it out of the water
Length-weight relationship W = a·Lb (a = 0.01148, b = 3.07; 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: Morone chrysops (ficha da espécie)Size, length-weight, depth, habitat, distribution, biology, and IUCN status. Page checked on Oct 13, 2026.
- scientific FishBase: nomes populares de Morone chrysopsNames 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: