pacific menhaden
Ethmidium maculatum · Clupeidae · forage fish
Savelha of the South American Pacific coast, forming large schools in coastal waters of Peru, Ecuador and Chile. It has commercial use and is sold fresh, frozen or canned.
Also called: savelha-do-pacífico, machuelo, machete, pacific menhaden
- maximum
- 31 cm
- depth
- 0–50 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 pacific menhaden
who is the pacific menhaden
A fish of the family Clupeidae, with a spindle-shaped, compressed body, reaching 31 cm and maturing at around 25 cm. It lives in coastal waters of the southeastern Pacific, from northern Peru to Chile, at depths of 0 to 50 m. It forms large schools and filters phytoplankton and zooplankton, mainly copepods, but also catches small fish and crustaceans. It spawns in spring, in Chile, with sticky eggs that attach to the coastal sand. It is commercially caught and sold fresh, frozen or canned.
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 pacific menhaden; in the meantime, see the similar species.
identification
Spindle-shaped, compressed body, with scutes along the back and belly. The upper jaw has a notch in the middle. It has a dark spot behind the gill cover and up to four rows of vertical oval spots along the flank. The scales have a serrated rear edge, and the anal fin is short and set well behind the last dorsal ray.
where found
Southeastern Pacific of Latin America, from northern Peru to Chile, with a record in Ecuador, in coastal waters.
Habitat: Coastal waters, in large schools, 0 to 50 m.
rules for the pacific menhaden
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. A small schooling fish with delicate skin: handle it with a wet hand and return it to the water if you won't use it.
in the kitchen
Sold fresh, frozen or canned.
how much it weighs without taking it out of the water
Length-weight relationship W = a·Lb (a = 0.00692, b = 3.15; 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: Ethmidium maculatum (ficha da espécie)Size, length-weight, depth, habitat, distribution, biology, and IUCN status. Page checked on Oct 13, 2026.
- scientific FishBase: nomes populares de Ethmidium maculatumNames 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: