bluestriped chub
Kyphosus ocyurus · Kyphosidae · omnivore
Surface and open-sea sea chub of the Pacific, with wavy yellow and blue stripes on the body. It has little commercial fishing and is not dangerous.
Also called: pirajica-de-listras-azuis, chopa salema, camote, bluestriped chub
- maximum
- 59 cm
- record/max.
- 2.0 kg
- depth
- 1–20 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 bluestriped chub
who is the bluestriped chub
The blue-striped sea chub belongs to the family Kyphosidae, the sea chubs. It reaches 59 cm, and the common size is 25 cm. It lives in the Pacific, from the Galápagos to Hawaii and from there to southeastern Japan, Guam and Palau, with records also in countries of the American Pacific, from Mexico to Peru. It occurs in open sea, near the surface, and also on deep reefs, along walls and drop-off edges. It may be solitary or form small schools, sometimes together with other sea chubs. Its diet is omnivorous, including zooplankton. It is an uncommon species, with little commercial fishing.
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 bluestriped chub; in the meantime, see the similar species.
fun facts
- Often seen near floating logs, far from the coast.
identification
Oval, elongated body, slightly compressed, with wavy horizontal yellow and blue stripes that run from the mouth to the base of the tail. The head is yellowish to silver, with a blue band behind the eye. The back is metallic blue, the belly is white, and the tail is deeply forked. The dorsal and anal fins are low. It swims together with other sea chubs, such as Kyphosus elegans and Kyphosus vaigiensis, and the wavy yellow and blue stripes help separate it from them.
where found
Occurs in the Pacific, from the Galápagos to Hawaii and as far as southeastern Japan, with records in countries of the American Pacific, from Mexico to Peru.
Habitat: Open sea near the surface, deep reefs and drop-off edges.
rules for the bluestriped chub
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 it is released, return it to the water quickly.
how much it weighs without taking it out of the water
Length-weight relationship W = a·Lb (a = 0.01778, 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: Kyphosus ocyurus (ficha da espécie)Size, length-weight, depth, habitat, distribution, biology, and IUCN status. Page checked on Oct 13, 2026.
- scientific FishBase: nomes populares de Kyphosus ocyurusNames 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: