greenland halibut
Reinhardtius hippoglossoides · Pleuronectidae · predator
Fish of cold, deep waters of the Northern Hemisphere, widely sold frozen and accepted in line fishing.
Also called: alabote-negro, fletán negro, platija negra, greenland halibut
- maximum
- 110 cm
- record/max.
- 7.0 kg
- depth
- 500–1,000 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
tap or drag on the chart to read each hour · on a keyboard, arrow keyssee 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 greenland halibut
who is the greenland halibut
Fish of the family Pleuronectidae, with a flattened body, reaching 110 cm and up to 7 kg. It lives in cold waters, usually at 500 to 1,000 m depth, close to the bottom, where the temperature ranges from -0.5 °C to 6 °C. It eats crustaceans, fish and other bottom invertebrates, such as deep-sea shrimp. It spawns in batches, and the eggs take about 50 days to develop. The larvae are pelagic, drift for four months and then settle on clay and mud bottoms, between 300 and 450 m.
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 greenland halibut; in the meantime, see the similar species.
fun facts
- It can live up to 36 years.
identification
Flattened body, with the dorsal fin starting behind the upper edge of the eye. The tail is almost straight or slightly forked, and the pectoral fins are small. Like the other flatfish of the family, it has both eyes on the right side of the body. It lives in cold, deep waters, between 500 and 1,000 m, which helps tell it apart from shallow-water flatfish.
where found
Lives in cold waters of the Northern Hemisphere, circling the globe; in the Americas, it reaches northern Baja California, Mexico.
Habitat: Cold, deep waters, 500 to 1,000 m, near the bottom.
rules for the greenland halibut
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.
It is not dangerous. When brought up from the bottom, the change in pressure can cause barotrauma; release it quickly if it is alive.
in the kitchen
Sold dried, salted or frozen, and can be steamed or fried.
how much it weighs without taking it out of the water
Length-weight relationship W = a·Lb (a = 0.00363, b = 3.19; 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: Reinhardtius hippoglossoides (ficha da espécie)Size, length-weight, depth, habitat, distribution, biology, and IUCN status. Page checked on Oct 13, 2026.
- scientific FishBase: nomes populares de Reinhardtius hippoglossoidesNames 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: