Mobula mobular · Mobulidae · forage fish
Devil ray from warm and temperate waters, with records in Brazil, Chile, and from Mexico to Peru. Capture is prohibited in Brazil: if you hook it by accident, release it right away.
Also called: jamanta-de-espinho, manta de espina, manta arpón, spinetail devil ray
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…
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.
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.
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.
The giant devil ray is a large mobulid of the family Mobulidae, with lobes in front of the head and a spine on the tail. It reaches 520 cm of disc width and weighs up to 1.5 t. It lives on the continental shelf and near oceanic islands, usually down to 200 m. It feeds on small crustaceans, such as euphausiids, and small fish, which it filters with its gill plates. It is ovoviviparous, with one pup per litter, born at 85 to 92 cm. It is bycatch of skipjack tuna gillnets, and its gill plates have high value. It is on the national list of threatened species as vulnerable, with capture prohibited in Brazil.
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 spinetail devil ray; in the meantime, see the similar species.
Flattened devil ray, with lobes in front of the head, a tail with a spine and small spines along its base. It is larger than the small devil ray (Mobula munkiana), which reaches 220 cm. The females recorded reach 240 cm. It may be found near oceanic islands and at the surface.
Occurs worldwide, in warm and temperate waters. In Latin America there are records in Brazil (São Paulo coast), Chile, Cuba, Central America and from Mexico to Peru.
Habitat: Surface and continental shelf, near oceanic islands, usually down to 200 meters deep.
coast
Summary of the regulations we found, with the source for each. Rules change; before keeping or transporting fish, check with the state environmental agency.
Conservation: On the national list of threatened species as VU. Global IUCN assessment: CR.
The national list (Portaria GM/MMA nº 1.667/2026) classifies the species as VU. Under Portaria GM/MMA nº 1.666/2026 (art. 3º), VU, EN and CR species have full protection: catch, transport, storage, processing and sale are banned. If you hook one by accident, release it at once, handling it as little as possible.
Source: Portaria GM/MMA nº 1.666/2026, art. 3º, and Portaria GM/MMA nº 1.667/2026
Many sharks and rays are on the national list (CR, EN or VU), with catching, keeping and transport prohibited, including those listed here. Species added to the list only in 2026 follow the 180-day deadline (until about Oct 25, 2026). If unsure of the species, release it.
Source: Portaria GM/MMA nº 1.666/2026 (art. 3º) and nº 1.667/2026 (Annex I)
Protected in Brazil: if you hook it by accident, release it right away. It is a large animal: don't try to pull it out of the water, and cut the line close to the hook. Don't touch the tail, which has a spine.
Length-weight relationship W = a·Lb (a = 0.01, b = 3.04; FishBase (relação peso-comprimento bayesiana, estimativa)). It's an average: a fat or lean fish can vary by 10% to 20%.
estimated weight
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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.
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.
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:
Your location is saved only on this device and feeds the forecast, the map and the "today" on the home page.
