Rockpool blenny
Fish · Last reviewed 2026-08-25
The blenny of Macaronesian rockpools — the islands' answer to the shanny, living in the top metre of water and nowhere else.
Catching Rockpool blenny
Everything here on fishing for it. Each entry opens the page behind it.
- When
- Mar and May — months recorded at the places that document it, not a season for the whole range.
- Where
- 2 places FishingHQ documents — strongest claim anywhere: recorded here · From the shore
FishBase gives this fish a depth range of 0 to 1 m, which is the narrowest in this entire file and tells you everything about where to look for it. It lives in rockpools, in the crevices of harbour walls and in the surge zone immediately below them, and it does not go deeper.
It is a small, blunt-headed, big-eyed blenny with a long continuous dorsal fin, branched tentacles above the eyes, and a mottled brown and cream pattern that changes with mood and background. FishBase records a maximum of 12 cm. It is an Atlantic fish rather than a Macaronesian endemic — Mauritania to Congo, including the Canaries, Cape Verde and Madeira, with records from Morocco and the Azores — but in the islands it is the blenny.
It is the Macaronesian counterpart of the shanny, and it matters for the same reason: a rockpool is where a great many people's fishing starts, and the blenny is what they catch. It is also, specifically, one of the two blennies a Lanzarote trip report landed and could not name — and one of the ten taken in a week by an angler deliberately fishing for them with the shot weight moved up to sit just below the hook, which is the whole technique for fishing a rockpool with a drop-shot rig.
Blennies are aggressive for their size, territorial, and will hold station in a pool defending a crevice against fish several times larger. They are also, kept in a bucket for a photograph on hot rock, extremely easy to kill.
How it is caught
Where Rockpool blenny is documented
Places where public sources describe this species as fished, with how it is fished and how strongly the evidence supports it. This is not a range map and it is not a recommendation — it is what has been written down about a fishery rather than a record of any individual catch, and being listed is never permission to fish.
The Azores
1 documented place
Ponta Delgada harbour, São Miguel
Harbour wall
Recorded here
From the shore
Reported Mar
Lanzarote
1 documented place
Puerto del Carmen harbour, Lanzarote
Harbour wall
Recorded here
From the shore
Reported May
What these strengths mean
- Recorded here
- At least one credible public account of this species being caught here. That is all it means.
Identification
No photograph of Rockpool blenny has passed identity review yet, so none is shown. FishingHQ publishes a species photograph only once somebody has confirmed the animal in it against the species record’s own diagnostic features.
- Scientific name
- Parablennius parvicornis
- Family
- Blenniidae
- Water
- Saltwater
- Conservation status
- Least Concern
- Regions
- Western Europe, West Africa, North Africa
- Small, elongate, scaleless fish with a blunt head, high-set eyes and a long unbroken dorsal fin running to the tail.
- Branched tentacles above each eye, which is the feature that says blenny rather than goby.
- Mottled brown, olive and cream, with the pattern changing to match background and mood.
- Rests propped on its pectoral fins on rock rather than swimming in midwater.
- FishBase records a depth range of 0 to 1 m and a maximum of 12 cm — a fish of the top metre of water and nothing below it.
Size
- Typical
- 6–9 cm
- Large
- 10 cm and over
Exceptional: FishBase records a maximum of 12 cm
Lifecycle and reproduction
Demersal over a depth range of 0 to 1 m: rockpools, crevices and the immediate surge zone. High resilience. Individuals are territorial and site-faithful, holding to a particular crevice or hole.
Blennies of this genus lay adhesive eggs in a crevice or under a stone which the male guards until they hatch, and this species' own reproduction is not separately documented on the FishBase record. The territorial behaviour an angler sees in a pool is that guarding behaviour.
Feeding and senses
Takes small crustaceans, worms and algae from rock within reach of its hole, darting out and returning. It will take a bait or a small soft plastic dropped beside the crevice almost immediately, and ignore one presented a foot away.
Sight, at very short range, and territorial response as much as hunger. A bait that moves into its space gets attacked whether or not the fish is feeding, which is why fishing for blennies is a matter of finding the hole rather than of presentation.
Through the year
Resident year-round in the same pools. Accessibility is a matter of tide rather than season: the pools that hold them are reachable at low water and under a metre of surge at high.
Distribution
Atlantic Ocean: Mauritania to Congo, including the Canary Islands, Cape Verde and Madeira. Also reported from Morocco and the Azores
This is a biological range — where the species occurs, not a prediction that you will catch one. To browse the fishing geography FishingHQ holds, start at fishing places.
Why anglers care
A light-rock-fishing and species-hunting target, and for a great many people the first fish they ever catch. Taken from rockpools and harbour-wall crevices on tiny scraps of bait or one-inch soft plastics on size 10 to 12 hooks, with the weight moved up close to the hook so the bait can be dropped into a hole rather than cast. Ten in a week to one angler on Lanzarote, deliberately fished for.
Handling and returning
Wet hands, or better, none: unhook in the pool with the fish still in water. A blenny left in a bucket or on hot rock dies quickly, and there is no version of this fishing where that is worth it. Crushed barbs on hooks this small make the difference.
Where to go next
Similar and related fish
- Black-faced blennyThree dorsal fins against one. The English name says blenny and the fish is not.
- Montagu's blennyThe crested one lives higher up the same rock.
- Ringneck blennyThe two blennies of Canarian rock, separated by depth as much as by pattern.
- ShannyThe northern European counterpart, occupying the same niche on a colder coast.
Where it lives
Sources and evidence
- FishBase: a global information system on fishes — Froese, R. and D. Pauly, eds. — FishBase Consortium (Scientific institute)Relied on for: Family, maximum size, depth range, environment, distribution and the IUCN assessment for Parablennius parvicornis.States this directlyPassage read and verified
- The IUCN Red List of Threatened Species — International Union for Conservation of Nature (Conservation authority)Relied on for: The Least Concern assessment for Parablennius parvicornis, assessed 08 December 2024.States this directlyCitation checked — the work exists and is described correctly
- Species hunting adventures on Lanzarote — a four-part shore diary with a full tally — Something Fishy Going On (angling blog), parts also posted to World Sea Fishing, 2014 (Practitioner report)Relied on for: That this species is taken from named public shore marks on Lanzarote, how many were caught across one week in May, and the light-tackle methods and baits that took them.States this directlyPassage read and verified
Why the 7 connections on this page are here, and the sources
Similar and related fish
Backed by research — 4 connections
Supported by peer-reviewed research or fisheries science. The sources are listed and can be checked.
Black-faced blenny
Tripterygion delaisi is a tripterygiid with THREE separate dorsal fins, on vertical rock and under overhangs; Parablennius parvicornis is a true blenniid with one continuous dorsal fin and branched supraorbital tentacles, in pools and the surge zone. The Azorean name for the first, `caboz de três dorsais`, states the difference the English name hides.
- FishBase: a global information system on fishes — Froese, R. and D. Pauly, eds. — FishBase Consortium (Scientific institute)Relied on for: The morphology, size, depth range and distribution that separate these two species from one another.States this directlyPassage read and verified
Montagu's blenny
Coryphoblennius galerita carries a transverse crest of fringed tentacles ACROSS the crown and reaches 7.6 cm; Parablennius parvicornis carries paired tentacles above each eye and reaches 12 cm. The first favours high-level upper-shore pools and eats barnacle cirri; the second is a fish of the lower pools and the surge zone.
- FishBase: a global information system on fishes — Froese, R. and D. Pauly, eds. — FishBase Consortium (Scientific institute)Relied on for: The morphology, size, depth range and distribution that separate these two species from one another.States this directlyPassage read and verified
Ringneck blenny
Parablennius parvicornis is recorded from 0 to 1 m and is a rockpool fish; Parablennius pilicornis is recorded from 0 to 25 m on rock faces and ledges and ranges from Iberia to Namibia and across to Brazil and South Africa.
- FishBase: a global information system on fishes — Froese, R. and D. Pauly, eds. — FishBase Consortium (Scientific institute)Relied on for: The morphology, size, depth range and distribution that separate these two species from one another.States this directlyPassage read and verified
Shanny
Lipophrys pholis is the rockpool blenny of northern European shores and Parablennius parvicornis is the Macaronesian one. They occupy the same niche on different coasts, and an angler who knows one will recognise the behaviour of the other immediately.
- FishBase: a global information system on fishes — Froese, R. and D. Pauly, eds. — FishBase Consortium (Scientific institute)Relied on for: The morphology, size, depth range and distribution that separate these two species from one another.States this directlyPassage read and verified
How it is caught
Reported, not established — 1 connection
Reported, but without independent support. Recorded because it is in circulation, not because it has been shown to hold.
Light rock fishing
The diary describes moving the drop-shot weight up to sit just below the hook so a bait can be lowered into a specific hole rather than cast and dragged — which is the technique for the whole rockpool fauna and is worth recording as practice rather than as a curiosity.
- Species hunting adventures on Lanzarote — a four-part shore diary with a full tally — Something Fishy Going On (angling blog), parts also posted to World Sea Fishing, 2014 (Practitioner report)Relied on for: The light-tackle methods, rigs, lures, baits and hook sizes a species-hunting angler used on Lanzarote, and the species each took.States this directlyPassage read and verified
Where it lives
Backed by research — 2 connections
Supported by peer-reviewed research or fisheries science. The sources are listed and can be checked.
Mudflats and intertidal sandflats
FishBase gives a depth range of 0 to 1 m, which is the narrowest in this batch and confines it to rockpools, crevices and the immediate surge zone — the intertidal, exactly.
- FishBase: a global information system on fishes — Froese, R. and D. Pauly, eds. — FishBase Consortium (Scientific institute)Relied on for: Environment, depth range, habitat association and distribution for Parablennius parvicornis.States this directlyPassage read and verified
Rocky shores and reefs
A demersal fish of the top metre over hard substrate. The intertidal band and the rocky shore are the same ground described by height and by material.
- FishBase: a global information system on fishes — Froese, R. and D. Pauly, eds. — FishBase Consortium (Scientific institute)Relied on for: Environment, depth range, habitat association and distribution for Parablennius parvicornis.States this directlyPassage read and verified
How FishingHQ labels evidence is explained in the evidence policy.