bluefin driftfish
Psenes pellucidus · Nomeidae · predator
Open-sea fish that accompanies jellyfish and floating algae. It has commercial use, but is little caught and is of no interest to sport fishing.
Also called: peixe-à-deriva-de-nadadeira-azul, derivante aleta azul, bluefin driftfish
- maximum
- 80 cm
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 bluefin driftfish
who is the bluefin driftfish
Open-sea fish of the family Nomeidae, which associates with jellyfish and patches of floating algae. Adults have a compressed body and dark brown to dark purple color, and juveniles are translucent. It reaches 80 cm. It feeds on zooplankton and small fish. Large adults may stay on the bottom, on continental slopes. It occurs in the Atlantic, Indian and Pacific oceans, and in Latin America there are records from Chile, Peru, French Guiana and Suriname. It has commercial use but little sport-fishing interest.
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 bluefin driftfish.
identification
Adults dark brown to dark purple, with dark blue eyes. Juveniles are translucent, with brown spots, and the first dorsal fin is dark. The body is laterally compressed. Being an open-sea fish, it is usually seen alongside jellyfish and patches of floating algae. In adults, the dark color and dark blue eye are the most reliable clues.
where found
In Latin America, there are records from Chile, Peru, French Guiana and Suriname, in the open sea.
Habitat: Open sea, in deep waters, alongside jellyfish and floating algae.
rules for the bluefin driftfish
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 spines are not dangerous. If it is hooked at depth, the ascent causes barotrauma, so release it carefully.
how much it weighs without taking it out of the water
Length-weight relationship W = a·Lb (a = 0.01995, b = 3.01; 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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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: Psenes pellucidus (ficha da espécie)Size, length-weight, depth, habitat, distribution, biology, and IUCN status. Page checked on Oct 13, 2026.
- scientific FishBase: nomes populares de Psenes pellucidusNames by country and language.
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: