rock bass
Ambloplites rupestris · Centrarchidae · omnivore
Sunfish from rivers and lakes of North America, with a rocky bottom, up to 43 cm. It is caught on rod and line and was introduced to Mexico.
Also called: peixe-sol-de-pedra, rock bass, crapet de roche
- maximum
- 43 cm
- record/max.
- 1.4 kg
- depth
- 0–21 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
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 rock bass
who is the rock bass
The rock bass is a centrarchid reaching 43 cm and 1.4 kg. It is native to North America, in the St. Lawrence and Great Lakes, Hudson Bay and Mississippi basins, and was introduced to Mexico, where it is exotic. It lives in rocky, shallow areas of lakes and in the warm, lower stretches of streams, down to 21 meters deep, and prefers clear water with no sediment. It eats small crustaceans, insects and fish. It is a sport fish, has little commercial fishing and is displayed in public aquariums.
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 rock bass; in the meantime, see the similar species.
fun facts
- Males guard the eggs and young for about 14 days.
identification
Deep-bodied, laterally compressed fish with the typical shape of sunfish and a spiny dorsal fin. To tell it apart from other sunfish in the region, look at the rocky habitat and clear water: this species lives on rock and in water without sediment, in shallow waters, down to 21 meters deep.
where found
North America; introduced to Mexico, where it is exotic.
Habitat: Rocky, shallow areas of lakes and lower stretches of streams, in clear water.
rules for the rock 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.
The dorsal spines cut: hold it by the body, away from the fin, and release it quickly.
how much it weighs without taking it out of the water
Length-weight relationship W = a·Lb (a = 0.01288, b = 3.09; 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: Ambloplites rupestris (ficha da espécie)Size, length-weight, depth, habitat, distribution, biology, and IUCN status. Page checked on Oct 13, 2026.
- scientific FishBase: nomes populares de Ambloplites rupestrisNames 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: