haller's round ray
Urobatis halleri · Urotrygonidae · predator
Small round stingray of sandy beaches and bays of the Pacific, from northern California to Ecuador. It has a tail spine that can cause injury, and it is caught on rod and line.
Also called: raia-redonda-de-Haller, raya redonda común, raya de espina, Haller's round ray
- maximum
- 58 cm
- record/max.
- 1.4 kg
- depth
- 1–21 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 haller's round ray
who is the haller's round ray
Haller's round stingray belongs to the family Urotrygonidae and reaches 58 cm and 1.4 kg. It lives on sand, gravel or mud bottoms of beaches, bays and coves, usually at 1 to 21 m deep, and sometimes near seagrass. It feeds on bottom invertebrates and small fish. Females have up to two litters a year, of up to six pups each. During mating, the male holds the edge of the female's disc. It has little commercial use and is occasionally caught on rod and line.
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 haller's round ray; in the meantime, see the similar species.
identification
Round-disc ray with a flattened body, small in size, with a thin tail and a spine on the tail, a trait of the family Urotrygonidae. The Panamic round stingray, Urotrygon aspidura, lives on the same coast but at greater depths, 5 to 100 m, and mainly in Central America. Because of its shallower depth, 1 to 21 m, and the bottom of beaches and bays, pay attention to where you are to tell the two apart.
where found
In Latin America it occurs from Mexico to Ecuador, through Central America, on sandy beaches, bays and coves. Going north, the species' range reaches northern California.
Habitat: Sand, gravel or mud of beaches, bays and coves, 1 to 21 m deep, near seagrass.
rules for the haller's round ray
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.
Watch the tail: the ray has a spine that can cause a wound. Hold it by the disc, away from the tail, and release it with minimal handling.
how much it weighs without taking it out of the water
Length-weight relationship W = a·Lb (a = 0.02291, b = 3.08; 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: Urobatis halleri (ficha da espécie)Size, length-weight, depth, habitat, distribution, biology, and IUCN status. Page checked on Oct 13, 2026.
- scientific FishBase: nomes populares de Urobatis halleriNames 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: