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.
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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
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 red-eye round herring
how to recognize it
Elongated, nearly cylindrical silvery body, with an olive-green back. Scales come off easily. The pelvic fin has a W-shaped scute, and there are no scutes either before or after it. The isthmus, the area between the gills, has lateral edges or shoulders. These traits, plus the color and the rounded body, help identify the species.
Also called: sardinha-redonda, sardina canalera, sardina japonesa, red-eye round herring, round herring
We don't have tips on season, bait or technique for this species yet.
where found
open on the large mapWhere to look: Coastal waters and shelf edge, from 0 to 125 m, in large schools.
In Latin America, it occurs in Cuba and Mexico, in the northwest Atlantic, from the Bay of Fundy to the Gulf of Mexico.
rules for the red-eye round herring
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.
how much it weighs without taking it out of the water
estimated weight
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how we calculate
Length-weight relationship W = a·Lb (a = 0.00794, 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%.
more about the red-eye round herring
Sardine of the family Dussumieriidae, which forms large schools in coastal waters and along the shelf edge, from 0 to 125 m. It reaches 33 cm, and the common size is around 25 cm. It is an epipelagic species that also appears at the surface. It feeds mostly on euphausiids and copepods, small plankton crustaceans. Eggs and larvae are planktonic. It has a strong commercial fishery, and is sold fresh, salted and canned, as well as being made into fishmeal.
Family: Dussumieriidae · forage fish
fun facts
- Eggs and larvae are planktonic, that is, they drift in the water.
in the kitchen
It goes to market fresh, salted and canned, and is also made into fishmeal.
sources and references (2)
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: Etrumeus sadina (ficha da espécie)Size, length-weight, depth, habitat, distribution, biology, and IUCN status. Page checked on Oct 13, 2026.
- scientific FishBase: nomes populares de Etrumeus sadinaNames by country and language.
how we calculatewhere 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: