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 dusky damselfish
how to recognize it
Adults are dark gray to black, with vertical black lines on the body. They have a black spot, sometimes diffuse, at the upper base of the pectoral fins, which are pale, and the other fins are dark. Juveniles are reddish orange on top, with bright blue spots on the forehead and dark marks at the base of the pectoral and dorsal fins and on the caudal peduncle; these colors fade as they grow. It lives in tide pools and on rocks battered by waves.
Also called: donzela-escura, jaqueta prieta, chopita prieta, dusky damselfish
We don't have tips on season, bait or technique for this species yet.
where found
open on the large mapWhere to look: Rocky shores battered by waves and tide pools, 0 to 3 m.
It occurs in the western Atlantic, from the Gulf of Mexico and the Caribbean to Panama and Venezuela, including the Bahamas and the Antilles. In Latin America it is found in Mexico, Central America, the Antilles and Venezuela.
rules for the dusky damselfish
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 = 0.02042, b = 2.98; FishBase (relação peso-comprimento bayesiana, estimativa pelo gênero e formato do corpo)). It's an average: a fat or lean fish can vary by 10% to 20%.
more about the dusky damselfish
The dusky damselfish is a Pomacentridae fish that reaches 15 cm. It lives on rocky shores exposed to waves and in tide pools, from 0 to 3 m deep. It eats mainly algae and detritus. It is territorial and pugnacious. During spawning it forms well-defined pairs, and the male guards and aerates the eggs, which stick to the bottom. It is a common fish, but it is only caught by chance in traps and beach nets, with no interest for rod fishing.
Family: Pomacentridae · omnivore
fun facts
- The male guards and aerates the eggs.
- It is aggressive toward other fish in its territory.
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: Stegastes adustus (ficha da espécie)Size, length-weight, depth, habitat, distribution, biology, and IUCN status. Page checked on Oct 13, 2026.
- scientific FishBase: nomes populares de Stegastes adustusNames 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: