yellow bass
Morone mississippiensis · Moronidae · predator
Freshwater fish of the Mississippi basin, native to the United States and also to Mexico. It reaches 46 cm and occasionally turns up on the line.
Also called: robalo-amarelo, yellow bass
- maximum
- 46 cm
- record/max.
- 11.0 kg
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
slide your finger or mouse over the chart to see each hoursee 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 yellow bass
who is the yellow bass
The yellow bass is a freshwater fish of the family Moronidae, reaching 46 cm and weighing up to 11 kg. It lives in pools and backwaters of small to large rivers, and also in ponds and lakes. Young ones eat microcrustaceans and mosquito larvae; adults eat small schooling fish. It occurs in the Mississippi basin, from the Great Lakes to the Gulf, in the United States, and in Mexico. It has sport value and is used as subsistence food.
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 yellow bass; in the meantime, see the similar species.
identification
Fusiform fish with two dorsal fins, the front one spiny, a trait of the family Moronidae. The name comes from the yellowish tone of the body. It lives in pools and backwaters of rivers and in lakes. To tell it apart from the white bass, of the same genus and the same region, look at the yellowish tone, which gives the species its name.
where found
Native to the Mississippi basin and Gulf drainages in the United States; Mexico is also among the countries where it occurs. Not recorded in Brazil.
Habitat: Pools and backwaters of small to large rivers, and ponds and lakes.
rules for the yellow 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.
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 = 0.01202, b = 3.05; 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 mississippiensis (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 mississippiensisNames 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: