spottail grunt
Haemulon maculicauda · Haemulidae · predator
Grunt of coastal reefs in the eastern Pacific, with blue dots on each scale and a large spot on the tail. Sold fresh, with small-scale fishing.
Also called: roncador-de-cauda-manchada, burro rasposo, roncador esmeralda, spottail grunt
- maximum
- 30 cm
- record/max.
- 0.6 kg
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 spottail grunt
who is the spottail grunt
The spotted-tail grunt belongs to the family Haemulidae, the grunts. It reaches 30 cm, and its common size is 25 cm. It lives in the eastern Pacific, from Baja California to Colombia, on coastal reefs. It has an oblong, compressed, deep body, with a large, terminal mouth. By day it forms schools near the reefs and at night spreads over sandy bottoms. Commercial fishing takes it on a small scale.
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 spottail grunt; in the meantime, see the similar species.
identification
Dark brown body, with a pearly blue dot on each scale, and the dots form lines that follow the rows of scales. The fins are yellowish, and the caudal peduncle has a large spot. It can be confused with Haemulon scudderii, silvery grey with dark dots on the scales, and with Haemulon sexfasciatum, which has dark vertical bars on a yellowish body.
where found
Found in the eastern Pacific, from Baja California to Colombia, on coastal reefs.
Habitat: Coastal reefs, moving to sandy bottoms at night.
rules for the spottail grunt
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 danger to anglers. If released, return it to the water carefully.
in the kitchen
Sold fresh in markets; it is a food fish.
how much it weighs without taking it out of the water
Length-weight relationship W = a·Lb (a = 0.0138, b = 3.03; 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: Haemulon maculicauda (ficha da espécie)Size, length-weight, depth, habitat, distribution, biology, and IUCN status. Page checked on Oct 13, 2026.
- scientific FishBase: nomes populares de Haemulon maculicaudaNames 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: