walleye surfperch
Hyperprosopon argenteum · Embiotocidae · predator
Silvery surfperch of sandy beaches and the surf zone of the Mexican Pacific. It is an important species for beach sport fishing in the region.
Also called: perca-olhuda, mojarra ojona, walleye surfperch
- maximum
- 30 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 walleye surfperch
who is the walleye surfperch
Surfperch of the family Embiotocidae, with a dark blue back and silvery sides and belly. The young have narrow golden vertical bands. It reaches 30 cm and is viviparous: the female carries the young, usually 5 to 12 at a time. It lives in the surf zone of sandy beaches and near rocks and piers, down to 18 m deep, in dense schools. It eats small crustaceans. It is caught often and is an important species for sport 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 walleye surfperch; in the meantime, see the similar species.
identification
Surfperch with a dark blue back, silvery sides and belly, and black tips to the pelvic fins. The young have golden vertical bands. The edge of the tail is also darkened. On the same beach, the calico surfperch (Amphistichus koelzi) has brown spots on the flanks that form bands, and reddish fins.
where found
From Vancouver Island, in Canada, to central Baja California, including Guadalupe Island; in Latin America, only in Mexico, on sandy beaches and near piers.
Habitat: Surf zone of sandy beaches, near rocks and piers, down to 18 m deep.
rules for the walleye surfperch
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 recorded danger to anglers. It is caught from the beach and the pier, so watch for waves and rocks.
how much it weighs without taking it out of the water
Length-weight relationship W = a·Lb (a = 0.0195, b = 2.97; 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: Hyperprosopon argenteum (ficha da espécie)Size, length-weight, depth, habitat, distribution, biology, and IUCN status. Page checked on Oct 13, 2026.
- scientific FishBase: nomes populares de Hyperprosopon argenteumNames 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: