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 blackspotted puffer
how to recognize it
Round-bodied, short and deep, covered in small spines, with large black spots scattered across it. Those spots are the main mark for identifying it. It lives on reefs with lots of invertebrate growth. Do not confuse it with the guineafowl puffer (baiacu-galinha-de-angola), which has pale spots on a dark background, not large black spots.
Also called: baiacu-de-pintas-pretas, baiacu, blackspotted puffer
don't confuse with:
We don't have tips on season, bait or technique for this species yet.
where found
open on the large mapWhere to look: Coral reefs, from the shore to the outer crest and slopes, from 0 to 60 m.
Indo-Pacific species, from east Africa to Micronesia and Samoa, north to southern Japan and south to New South Wales. In Latin America it is recorded only in Mexico. There are no records from the Brazilian coast.
rules for the blackspotted puffer
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 = 0.03715, b = 2.87; 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 blackspotted puffer
The family Tetraodontidae includes the puffers, round-bodied and covered in small spines. This species reaches 33 cm and lives on Indo-Pacific reefs, from east Africa to Micronesia and Samoa, north to southern Japan and south to New South Wales; in Latin America it is recorded in Mexico. It occupies coral reefs, from the shore to the outer crest and slopes, from 0 to 60 m, with plenty of invertebrates. It feeds on tips of Acropora corals, crustaceans, mollusks, sponges, tunicates and algae. Sometimes it lives alone, but adults usually go in pairs. It is common and enters commercial fishing and public aquariums.
Family: Tetraodontidae · omnivore
fun facts
- Adults are usually found in pairs.
similar species
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: Arothron nigropunctatus (ficha da espécie)Size, length-weight, depth, habitat, distribution, biology, and IUCN status. Page checked on Oct 13, 2026.
- scientific FishBase: nomes populares de Arothron nigropunctatusNames 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: