dow's mojarra
Eucinostomus dowii · Gerreidae · omnivore
Spindle-shaped, silvery mojarra of shallow waters and estuaries of the eastern Pacific. It shows up in nets as bycatch.
Also called: carapicu-prateado, carapicu, mojarra, Silver mojarra
- maximum
- 20 cm
- record/max.
- 2.2 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
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 dow's mojarra
who is the dow's mojarra
The silver mojarra is of the family Gerreidae and reaches 20 cm, with a common size of 12 cm. It lives in shallow waters of the eastern Pacific, from Panama to Peru, including the Galápagos Islands, over sand or mud bottoms, near the coast and in estuaries. It has a spindle-shaped, not very tall, silvery body with green reflections, and its fins are transparent, except for the black tips of the longest dorsal spines. It shows up as bycatch in nets and has no significant commercial interest.
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 dow's mojarra; in the meantime, see the similar species.
identification
Spindle-shaped, compressed and not very tall body, silvery with iridescent green reflections. The mouth is protractile, the preopercle edge is smooth, and the pelvic fins are long. The fins are transparent, except for the black tips of the longest dorsal spines. Compare it with the Pacific mojarra (Eucinostomus currani), which has a shorter, taller body, and with the Peruvian mojarra (Diapterus peruvianus), which has a diamond-shaped body.
where found
Lives in the eastern Pacific, from Panama to Peru, including the Galápagos Islands.
Habitat: Shallow coastal waters, over sand or mud, including estuaries.
rules for the dow's mojarra
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.
Poses no danger to anglers. Because it is small, it can be released without problems.
how much it weighs without taking it out of the water
Length-weight relationship W = a·Lb (a = 0.01122, b = 3.09; 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: Eucinostomus dowii (ficha da espécie)Size, length-weight, depth, habitat, distribution, biology, and IUCN status. Page checked on Oct 13, 2026.
- scientific FishBase: nomes populares de Eucinostomus dowiiNames 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: