StrikeAhead

Atlantic lizardfish: the lizard-headed ambush hunter that waits for its prey in the Mediterranean sand

It lies buried in the sand with only its eyes showing, and when a small fish swims past, it shoots upwards: the Atlantic lizardfish, *Synodus saurus* — in German Atlantischer Eidechsenfisch (German Wikipedia and GBIF), in Spanish lagarto, in Italian pesce lucertola, in French poisson-lézard rayé, in Portuguese lagarto-da-costa, in Dutch leguaanvis, in Danish atlantisk øglefisk, in Finnish atlantinliskokala, in Russian европейский ящероголов, in Turkish iskamroz or lokum balığı, in Greek σκαρμός, in Albanian peshk hardhucë (all GBIF) and in Croatian gušter (Wikidata). For Swedish, Norwegian, Slovenian, Japanese and Arabic we found no confirmed species name in GBIF or Wikidata. Here is how to recognise it, where and how deep it lives, how it hunts, what it eats, when it spawns — and why you should never confuse it with a weever, even though the two lie in the sand looking deceptively alike.

A predator with a lizard’s head

It was described by Carl Linnaeus in 1758. According to FishBase it belongs to the family of lizardfishes (Synodontidae) in the order Aulopiformes — so it is not closely related to cod, perch or sea bream. It bears its name rightly: according to German Wikipedia its head and body recall a lizard; according to French Wikipedia the head is flattened and pointed, and the eyes sit on top of the head. According to FishBase and German Wikipedia it is harmless to humans, and FishBase explicitly lists it as a game fish.

How to recognise it

  • Body and head: very slender (Italian Wikipedia), the head flat and pointed, the eyes on top (French Wikipedia).
  • Mouth: very large, set with numerous sharp teeth (Italian and German Wikipedia) — the mouth of a fish hunter.
  • Markings: light brown to sand-coloured, paler below; according to German Wikipedia about eight dark crossbands on the back, according to French Wikipedia eight to ten, plus bluish or white longitudinal lines along the flanks. According to Italian Wikipedia the iris is reddish-gold. According to German Wikipedia males and females look the same.
  • Fins: a dorsal fin with 11 to 13 soft rays, an anal fin with 9 to 12 rays, pelvic fins with 8 and pectoral fins with 12 to 14 rays, a two-lobed tail fin; 54 to 60 scales along the lateral line (German and Italian Wikipedia).
  • Inside: According to French Wikipedia it has no swim bladder — fitting for a fish that lies on the bottom.
  • Size: usually around 20 cm, at most about 40 cm and, according to FishBase, 300 g. According to French Wikipedia the juveniles are completely transparent apart from the dark crossbands they already carry when they hatch.

The ambush hunter in the sand

What makes it special for anglers is the way it hunts. According to German Wikipedia it lies in wait on the bottom propped up on its pelvic fins and sometimes buries itself in the sand; English Wikipedia describes how it leaves only its eyes exposed and strikes as soon as prey comes within reach. According to German Wikipedia it watches its prey for a long time before shooting upwards up to 5 m in a fast lunge — and most attacks miss. If it is threatened itself, according to German Wikipedia it first tries threat displays with its mouth, body and fins before fleeing.

According to FishBase it feeds mainly on other fish. German Wikipedia calls it an opportunistic predator that takes above all juveniles of schooling fish such as sea breams and herring-like fishes; smaller individuals eat smaller prey. French Wikipedia lists sardines (*Sardina pilchardus*), axillary seabream (*Pagellus acarne*), bogue (*Boops boops*), gobies and wrasses, plus young squid, slipper lobsters (*Scyllarus arctus*) and the parasitic isopod *Anilocra physodes* — and also juveniles of its own species. Italian Wikipedia also mentions cephalopods and decapod crustaceans. FishBase gives it a trophic level of 4.5 — a predator from the very top of the ladder, just in a small format. According to French Wikipedia it is eaten by larger fish such as pompano (*Trachinotus ovatus*), dusky grouper (*Epinephelus marginatus*) and dolphinfish (*Coryphaena hippurus*).

Where it lives — and how deep

It lives on both sides of the Atlantic: according to FishBase in the east from Morocco to Cape Verde, including the Azores and the Mediterranean, and in the west from Bermuda and the Bahamas to the Lesser Antilles. Its ground, according to FishBase, is sand and rocky sand, especially around islands; German and Italian Wikipedia also mention seagrass meadows, the Italian one explicitly Neptune grass, *Posidonia oceanica*. On depth the sources agree for once: usually down to 20 m, recorded from 1 to 400 m (FishBase, German, Italian and French Wikipedia). So this is a fish that, in the Mediterranean, also lives within reach of the shore and of a small boat.

Spawning and young

According to German Wikipedia it spawns from June to October, and does so in several batches; Italian Wikipedia speaks generally of summer. According to German Wikipedia a female lays 2,000 to 100,000 eggs per batch, depending on her size. According to Italian Wikipedia the eggs measure 1.6 to 2 mm and, like the larvae, drift in open water. According to German Wikipedia females reach sexual maturity at about three years, males at about two; FishBase gives no length at maturity.

On the hook and on the plate

Economically it plays hardly any role. FishBase lists a minor commercial fishery and a medium price category; according to German Wikipedia it has little commercial value and ends up occasionally as bycatch. Italian Wikipedia describes it being caught with trawls and with lines baited with worms and crustaceans; there its flesh is considered good, is valued especially in southern Italy and is mostly used for soups. For you this means: if you fish the bottom over sand and seagrass in shallow water in the Mediterranean, you may hook one. None of our sources names other baits or rigs — which is why none are listed here.

Status — and what you can do

On the IUCN Red List the Atlantic lizardfish is classed as Least Concern, assessed according to FishBase and German Wikipedia on 4 February 2009. According to Italian Wikipedia it is common over a large area and is taken as bycatch only in parts of its range; German Wikipedia calls the population trend unknown. FishBase rates its vulnerability to fishing as moderate to high (47 out of 100) and its resilience as medium — a population doubles in 1.4 to 4.4 years.

For you at the water this means: whether a minimum size or a catch limit applies to it is set by the national and regional regulations of each country — we found no generally valid rule for recreational anglers. Ask the local fisheries office or your guide before your trip. And because the spawning season runs from June to October, it is a good idea in those months to release small and ripe fish gently.

Five contradictions in the sources

  • Does it hunt at night or by day? Italian Wikipedia: a nocturnal fish that spends most of the day buried. French Wikipedia: active by day and by night. English and German Wikipedia describe the ambush hunting but commit to no time of day.
  • How big does it get? FishBase: at most 40 cm standard length — that is, measured without the tail fin. German and English Wikipedia: maximum around 40 cm. Italian Wikipedia: it can exceed 40 cm. On the usual size they all agree: around 20 cm.
  • How many crossbands? German Wikipedia: about eight. French Wikipedia: eight to ten.
  • Where does it live in the western Atlantic? FishBase, German, English and Italian Wikipedia: from Bermuda and the Bahamas to the Lesser Antilles. French Wikipedia also names Florida — which appears in none of our other sources.
  • Is it spreading or not? French Wikipedia: stocks have been growing since the 1980s, gradually displacing local species, and the northward spread in the Mediterranean is probably linked to water warming of about 0.5 °C. German Wikipedia: population trend unknown. Italian Wikipedia and IUCN: common, not threatened — there is no mention of any spread.

Three naming traps

  • Lizardfish or weever? According to French Wikipedia it is often confused with the weever (*Trachinus*) — both lie buried in the sand. The difference matters, because weevers carry venomous spines, while the lizardfish is harmless. According to French Wikipedia you can tell them apart by the first dorsal fin, which sits further back on the lizardfish, and by the face. If you are not sure: don’t grab it with bare hands.
  • “Lizardfish” is a whole family. On its own, the name covers the entire family Synodontidae — in German, too, plain “Eidechsenfisch” means the whole family; our fish is the Atlantic lizardfish. A relative from the same genus, *Synodus synodus*, according to German Wikipedia carries a dark spot at the tip of the snout — our fish lacks this spot.
  • “Lagarto” identifies nothing. The Spanish and Portuguese word simply means lizard, and for our fish GBIF also lists pez de San Francisco in Spanish; in French, next to poisson-lézard rayé, it also gives plain lézard. Only the scientific name *Synodus saurus* makes things unambiguous.

That leaves the question every article in this series starts with: when. For a fish that lies in the sand waiting for passing prey, that is no side issue. Habitat, prey and habits are covered above, and they are fixed. What changes every day is everything else — light, air pressure, wind, water temperature, current — and whether a day over the sandy bottom is worth it is decided right there. That is what StrikeAhead calculates: it takes the conditions at your water and tells you when the trip is worth it. And because you don’t know a foreign fishing ground, its edges and its rules from day one, StrikeAhead Pathfinder tells you who to go out with: curated guides and skippers, personally vetted before listing — licence and insurance —, with verified catches instead of ad photos, no paid ranking and, for you as an angler, no booking fee. The app tells you when, Pathfinder with whom.