roundnose grenadier
Coryphaenoides rupestris · Macrouridae · predator
A deep-water grenadier of the North Atlantic, with records from the Bahamas. It is overfished in the North Atlantic and is of no interest to sport fishing.
Also called: granadeiro-de-focinho-redondo, granadero de roca, granadero, roundnose grenadier
- maximum
- 110 cm
- record/max.
- 1.7 kg
- depth
- 400–1,200 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 roundnose grenadier
who is the roundnose grenadier
A deep-water fish of the family Macrouridae, with a large head and a broad, rounded snout, which forms large schools between 600 and 900 m. It lives from 400 to 1,200 m and reaches 110 cm and up to 1.7 kg. It occurs in the North Atlantic, from Canada and Greenland to Norway and the African coast. It feeds on fish and invertebrates, mainly shrimp and pelagic amphipods. The species is overfished in the North Atlantic and is used frozen and for fishmeal.
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 roundnose grenadier.
identification
An elongated fish, brown to grayish, with the eye sockets, mouth, gill covers and fins dark, almost black. The head is large and soft, with a broad, rounded snout that ends in a large tubercle-like plate. It has a small chin barbel.
where found
In Latin America there are records only in the Bahamas, in deep waters east of Andros Island.
Habitat: Deep, cold waters, 400 to 1,200 m, with schools between 600 and 900 m.
rules for the roundnose grenadier
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.
No dangerous spines. It lives at depth, and ascent causes barotrauma, so release it carefully.
in the kitchen
It is used frozen and for fishmeal, and can be fried or baked.
how much it weighs without taking it out of the water
Length-weight relationship W = a·Lb (a = 0.00219, b = 3.2; 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: Coryphaenoides 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 Coryphaenoides rupestrisNames 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: