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 blackeye goby
how to recognize it
Spindle-shaped body with a rounded caudal fin. During spawning, adult males show a black ventral disc, which they raise from the bottom to attract females. They live hidden in burrows and among rocks, but juveniles may be found far from shore, among plankton. No distinctive color or mark is recorded, so habitat helps: sandy bottom near rocks, from the intertidal zone down to 106 m.
Also called: gobião-olho-preto, gobião, gobio triste, Blackeye goby
We don't have tips on season, bait or technique for this species yet.
where found
open on the large mapWhere to look: Sandy bottom near rocks, from the intertidal zone down to 106 m.
In Latin America, only in Mexico, as far as central Baja California. The species ranges from British Columbia, Canada.
rules for the blackeye goby
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 = 0.01023, b = 3.01; FishBase (relação peso-comprimento bayesiana, estimativa)). It's an average: a fat or lean fish can vary by 10% to 20%.
more about the blackeye goby
The blackeye goby belongs to the family Gobiidae and reaches 15 cm. It lives in the eastern Pacific, from British Columbia, Canada, to central Baja California, Mexico, on sand bottoms near rocks, from the intertidal zone down to 106 m. It has a spindle-shaped body and hides among rocks or in holes when approached. It is a protogynous hermaphrodite: born female, it can change into male, and forms groups with one male and several smaller females. Spawning takes place from April to October, and the male guards the eggs in the nest. It has commercial use, including for aquariums.
Family: Gobiidae · omnivore
fun facts
- The change of sex, from female to male, is completed in less than 5 months.
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: Rhinogobiops nicholsii (ficha da espécie)Size, length-weight, depth, habitat, distribution, biology, and IUCN status. Page checked on Oct 13, 2026.
- scientific FishBase: nomes populares de Rhinogobiops nicholsiiNames 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: