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.
Loading the forecast…
—
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 opaleye
how to recognize it
Spindle-shaped body, typical of the family. No distinctive color or mark is recorded, so the habitat helps: it lives on rocky shores and kelp beds, often in the intertidal zone, where it may stay in pools. In spring it forms dense schools in kelp beds. It is resident, can leave tide pools when the water is poor, and breathes air out of the water.
Also called: peixe-olho-de-opala, chopa verde, opaleye
We don't have tips on season, bait or technique for this species yet.
where found
open on the large mapWhere to look: Intertidal zone, rocky shores and kelp beds, down to 30 m.
In Latin America, only in Mexico, in southern Baja California. The species occurs from San Francisco, in the United States.
rules for the opaleye
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
—
how we calculate
Length-weight relationship W = a·Lb (a = 0.01698, 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%.
more about the opaleye
The opaleye belongs to the family Girellidae and reaches 66 cm. It lives in the eastern Pacific, from San Francisco, in the United States, to southern Baja California, in Mexico, on rocky shores and kelp beds, in the intertidal zone and down to 30 m. It is a resident fish that always returns to the same place. It feeds mainly on algae and sometimes on invertebrates. In spring it forms dense schools in kelp beds, and it spawns in the water column. It is considered an important sport fish and is also sold fresh.
Family: Girellidae · omnivore
fun facts
- Always returns to the same place, and may leave tide pools when the water is poor.
in the kitchen
Sold fresh in markets.
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: Girella nigricans (ficha da espécie)Size, length-weight, depth, habitat, distribution, biology, and IUCN status. Page checked on Oct 13, 2026.
- scientific FishBase: nomes populares de Girella nigricansNames 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: