rock wrasse
Halichoeres semicinctus · Labridae · predator
Wrasse of rocks and tide pools in the Mexican Pacific, which buries itself in the sand when frightened. It is almost never caught with a rod.
Also called: bodião-de-pedra, señorita piedrera, rock wrasse
- maximum
- 38 cm
- depth
- 0–24 m
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
slide your finger or mouse over the chart to see each hoursee 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 rock wrasse
who is the rock wrasse
The rock wrasse is of the family Labridae and reaches 38 cm. It lives near the rocks, close to sand patches and in tide pools, from 0 to 24 m, from California, in the United States, to Guadalupe Island and the Gulf of California, in Mexico. When disturbed, it buries itself in the sand, and at night sleeps buried with its head out. It eats gastropods and small crustaceans, and has been seen removing parasites from other fish. Each individual starts as a female and changes to a male at about 30 cm. It spawns freely in the water and is taken for the trade and the aquarium.
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 rock wrasse; in the meantime, see the similar species.
fun facts
- Changes from female to male at about 30 cm in length.
identification
Elongated wrasse, tied to the rocks where it lives. It is usually seen near rocks, in sand patches and in tide pools. When frightened, it buries itself in the sand, and at night sleeps buried, with only its head out. In the same region lives the senorita, which is smaller and more closely tied to algae.
where found
In Latin America it occurs in Mexico, at Guadalupe Island and in the Gulf of California, near rocks and sand. It extends north to California, in the United States.
Habitat: Near rocks, in sand patches and in tide pools, from 0 to 24 m.
rules for the rock wrasse
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.
Poses no danger to anglers. It is a small, fragile fish: handle it with wet hands and release it quickly.
how much it weighs without taking it out of the water
Length-weight relationship W = a·Lb (a = 0.00977, b = 3.08; 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%.
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: Halichoeres semicinctus (ficha da espécie)Size, length-weight, depth, habitat, distribution, biology, and IUCN status. Page checked on Oct 13, 2026.
- scientific FishBase: nomes populares de Halichoeres semicinctusNames by country and language.
similar species
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: