siamese algae-eater
Gyrinocheilus aymonieri · Gyrinocheilidae · omnivore
Freshwater fish from Asia that feeds on algae and is sold for the aquarium. In Puerto Rico, where it was introduced, it is an exotic species.
Also called: peixe-comedor-de-algas-siamês, peixe-comedor-de-algas, Siamese algae-eater
- maximum
- 28 cm
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.
Reading the weather across 3 global models and 31 simulations…
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hour by hour
tap or drag on the chart to read each hour · on a keyboard, arrow keyssee hour-by-hour table
why this index at —?
choose the day
Each card shows the day's index (0 to 100) and, below it, a strip with the index for each hour, from 0h to 23h. from poor to excellent.
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 siamese algae-eater
who is the siamese algae-eater
Freshwater fish of the family Gyrinocheilidae, with an elongated body and a suction-cup mouth. It occurs in Asia, in the Mekong and Chao Phraya river basins, and lives in medium to large rivers. It feeds mostly on algae and periphyton, but also on insect larvae and zooplankton. To stay firm in the current, it clings to fixed objects with its suction-cup mouth. Large specimens are sold in markets. It is not a sport fish. It was introduced to Puerto Rico, where it is exotic.
Essential profile. Identification, where it occurs and rules, with data from FishBase and the cited regulations. Season, time of day, technique and bait are added once we have a good source for the siamese algae-eater.
fun facts
- In aquariums, adults are territorial and need groups of five or more individuals.
identification
Elongated fish, with a suction-cup mouth on the underside of the head, used to cling to stones. The pelvic and anal fins have no dark spots; behind the spiracle there is usually a small dark spot, always present. Sometimes there are small tubercles on the side of the head, and large tubercles restricted to the snout.
where found
Native to Asia, in the Mekong and Chao Phraya rivers, and introduced to Puerto Rico. Not recorded in Brazil.
Habitat: Freshwater, in medium to large rivers and flooded fields, over a firm bottom with current.
rules for the siamese algae-eater
Summary of the regulations we found, with the source for each. 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.
catch and release
catch and release Releasing the fish alive, quickly and with a wet hand. During a closed season it isn't always allowed: what the regulation says applies.
Not dangerous to anglers. As it is exotic in Puerto Rico, it should not be released in rivers where it does not occur.
how much it weighs without taking it out of the water
Length-weight relationship W = a·Lb (a = 0.00389, b = 3.12; FishBase (relação peso-comprimento bayesiana, estimativa)). It's an average: a fat or lean fish can vary by 10% to 20%.
estimated weight
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sources and references
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: Gyrinocheilus aymonieri (ficha da espécie)Size, length-weight, depth, habitat, distribution, biology, and IUCN status. Page checked on Oct 13, 2026.
- scientific FishBase: nomes populares de Gyrinocheilus aymonieriNames by country and language.
where 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: