giant kelpfish
Heterostichus rostratus
Fish of algae and rocks of the Pacific, from California to Baja California, from the intertidal zone to 40 m. It is commercially caught and appears in the aquarium trade.
Also called: peixe-das-algas-gigante, sargacero gigante, giant kelpfish
- maximum
- 61 cm
- depth
- 0–40 m
who is the giant kelpfish
Fish of the family Clinidae, with an elongated body, reaching 61 cm and living up to 4 years. It lives among large algae and rocks, often in kelp forests, from the intertidal zone to 40 m, in the Pacific, from California, in the United States, to southern Baja California, in Mexico, including Guadalupe Island. Juveniles form schools, and adults are solitary. It eats small crustaceans, mollusks and small fish. It is commercially caught and collected for aquariums.
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 giant kelpfish; in the meantime, see the similar species.
fun facts
- The female attaches the eggs to algae, and the male guards them.
identification
Elongated body, with a long dorsal fin running along almost the whole back, a typical trait of the family. The best sign is the habitat: it hides among large algae and rocks, from the intertidal zone to 40 m. Juveniles travel in schools and adults are solitary. It is much larger than the striped kelpfish, which reaches 24 cm.
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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.
Essential profile: the index uses a general fish model (weather, sun, moon and tide), without a season or time of day specific to this species.
where found
From California, in the United States, to southern Baja California, in Mexico, including Guadalupe Island; in Latin America, only in Mexico, among algae and rocks.
Habitat: Among large algae and rocks, from the intertidal zone to 40 m.
rules for the giant kelpfish
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.
No recorded danger to anglers. Handle it carefully and return it to the water.
how much it weighs without taking it out of the water
Length-weight relationship W = a·Lb (a = 0.00513, b = 3.07; FishBase (relação peso-comprimento bayesiana, estimativa da própria espécie)). 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: Heterostichus rostratus (ficha da espécie)Size, length-weight, depth, habitat, distribution, biology, and IUCN status. Page checked on Oct 13, 2026.
- scientific FishBase: nomes populares de Heterostichus rostratusNames by country and language.
