Mediterranean Spearfish: The Predator Whose Name Means Needle
Every article in this series answers the same question: how does the angler outwit the predator? With which bait, at what depth, at what time. With the Mediterranean spearfish, the answer begins with a needle. Its species name is *belone* — Greek for needle — and that very word is also the genus name of the garfish, *Belone belone*, which has its own article in this series. So the pole of this article is: the predator whose name means needle. The fish is *Tetrapturus belone*, the Mediterranean spearfish — and it is more than a footnote: according to FishBase it is the only marlin that spends its entire life inside the Mediterranean.
Four fins, one tail — and a needle
The origins of scientific names are recorded by the ETYFish Project, an etymological register of fish names. The genus Tetrapturus (Rafinesque 1810) is listed there as “tetra, four; ptera, fin; ouros, tail”, “referring to two wing-like caudal keels on each side of caudal peduncle” — the two wing-like keels on each side of the tail stalk. The species name belone is explained in seven words: “Greek for needle, referring to short, spear-like bill” — Greek for needle, after the short, spear-like bill. On the same page stands the swordfish for comparison: Xiphias is the “ancient Greek name for swordfish”, from *xiphias*, sword, and *gladius* is simply “Latin for sword”. Two fish, two weapons: one carries the sword in its name, the other the needle. ETYFish lists the family as ISTIOPHORIDAE, “Billfishes and Marlins”, with five genera and ten species — a small family, and our fish is the one that lives in the Mediterranean.
How far the needle reaches is shown by the GBIF name list for *Tetrapturus belone* (key 2397951). There is a spear camp: English “Mediterranean spearfish” and “Mediterranean shortbill spearfish”, German “Mittelmeer-Speerfisch”, Dutch “Middellandse-Zeespeervis”, Danish “Middelhavsspydfisk”, Russian “Средиземноморский копьеносец” — the Mediterranean spear-bearer — Arabic “سمك الرمح المتوسطي”, Turkish “Akdeniz zıpkın balığı”, the harpoon fish of the Mediterranean, and French “Poisson-pique”. There is a marlin camp: Greek “Μαρλίνος Μεσογείου”, French “Marlin de Méditerranée”, Spanish “Marlín del Mediterráneo”, Swedish “Medelhavs-marlin”, Norwegian “Middelhav-marlin”, Finnish simply “Marliini”. And there is a needle camp: Italian “Aguglia imperiale” — with the Sicilian forms “Agugghia ’mpiriale” and “Ugghia ’mpriali” — French “Aguglia impériale”, Spanish “Aguja de pico corto”, the short-billed needle, Croatian and Serbian “Iglan”, and Serbian “Iglokljun”, the needle-bill. In Portuguese it is “Espadim-do-Mediterrâneo”, the little sword; in Japanese “チチュウカイフウライ”.
💣 Four name traps, each checked against the GBIF lists for the garfish (*Belone belone*, key 2369178) and the swordfish (*Xiphias gladius*, key 2397850). First, the needle word itself. Italian “aguglia”, Spanish “aguja”, Portuguese “agulha” and even French “Aguglia” appear there for the garfish. The spearfish carries those words only with an addition: *imperiale*, *de pico corto*. And GBIF lists that same Portuguese “Agulha” for the swordfish as well — one word, three fish, and all three have their own article in this series. Second, the Balkans. Croatian “Iglan” is the spearfish, “Iglun” the swordfish, “iglica” the garfish — three fish from one root (*igla*, needle), and between Iglan and Iglun lies a single vowel. Third, Albanian. “Peshku shtize” literally means spear fish — in GBIF it is the swordfish. For *Tetrapturus belone* there is no Albanian name at all in GBIF, and no Slovenian one (in Slovenian, “mečarica” is the swordfish and “íglica” the garfish). Those two versions of this article therefore name the fish descriptively and say so openly. Fourth, the source itself. Maltese “Pixxispad” appears in GBIF for the spearfish and for the swordfish; only “Pixxispad qasir”, the short one, means ours. And FishBase writes of the Mediterranean spearfish that it “may have been identified as T. albidus by anglers and fishermen” — as the white marlin. The mix-up is recorded in the reference work, not only on the quay.
Two metres forty, seventy kilos
The key facts come from FishBase, whose main reference for this species is the FAO species catalogue “Billfishes of the world” by Nakamura (1985). The Mediterranean spearfish grows to 240 centimetres total length; the maximum published weight is 70 kilograms. FishBase gives the common length as 200 centimetres — ⚠️ but as OT, a different length measure from total length; the two figures are therefore not directly comparable, and this article does not claim that an average fish is two metres long. The body shape FishBase records simply as “elongated”. Its sea is narrowly drawn: “Mediterranean Sea: considerably abundant around Italy” — in the Mediterranean, considerably abundant around Italy; from the Black Sea there is no confirmed report. The IUCN status is “Least Concern”, assessed on 15 November 2021; to humans it is “Harmless”. FishBase lists the fishery as “minor commercial”, the stock’s resilience as “Low” with a population doubling time of 4.5 to 14 years, and its fishing vulnerability as moderate (45 of 100) — a fish that grows back slowly.
The only marlin that never leaves the Mediterranean
The most important sentence for anglers is in the FishBase “Biology” section: “This species is the most common istiophorid in the central basin of the Mediterranean and completes its life cycle inside this sea as far as is known to date” — it is the most common billfish in the central Mediterranean basin and completes its life cycle inside this sea, as far as is known today. No run into the Atlantic, no traveller between oceans: this marlin belongs to the Mediterranean. And it does not hold at the depth one expects of a billfish: “Probably swims in the upper 200 m water layer, generally above or within the thermocline” — probably in the upper 200 metres, generally above or within the thermocline, the layer where water temperature drops away sharply. ⚠️ That sits in tension with the environment line of the same source, which reads “Deep-water” and “pelagic-oceanic”, while the depth range is given as 0 to 200 metres. This article reports both and does not resolve it. ⚠️ A second contradiction in the distribution line stays open too: “No adults have been reported east of the Ionian Sea” stands there right next to “Reportedly caught from the Aegean Sea”. Anyone fishing the Aegean should know both.
What it eats — and why it is rarely alone
FishBase sums up the prey in three words: “Feeds on fishes”. No crustaceans, no cephalopods in that line; a predator that hunts predators. And then a sentence worth more on the water than any size figure: “Travels in pairs, possibly corresponding to a feeding behavior” — it travels in pairs, possibly connected to feeding behaviour. ⚠️ The “possibly” belongs to the source and stays here: why the two travel together is not settled. On reproduction FishBase is explicitly cautious: “Winter and spring might not be an unreasonable hypothesis for the spawning season of this species” — winter and spring might not be an unreasonable hypothesis for the spawning season. That is a conjecture in the subjunctive, not a season, and this article does not turn it into one.
What that means on the water
- The upper two hundred metres are the ground. FishBase places it above or within the thermocline. Knowing where the water temperature drops away means knowing the layer the source describes — StrikeAhead shows you water temperature and conditions for your spot.
- Two, not one. It travels in pairs. A single take does not mean a single fish.
- Fish eats fish. The source names fish alone as prey. Which lure size or method catches, none of the sources read here say; this article promises none.
- Italy is the centre. “Considerably abundant around Italy” is the clearest location the source gives. East of the Ionian Sea it thins out — with the open contradiction of the Aegean line.
- The name misleads, the bill does not. A short, spear-like bill separates it from the swordfish, and size separates it from the garfish. When someone says “aguglia”, “iglan” or “agulha”, ask for the second word.
- A fish that grows back slowly. FishBase calls its resilience “Low”, with a doubling time of 4.5 to 14 years. That is an argument for careful handling and for releasing — and a decision that stays yours.
- Check the rules yourself. Minimum sizes, bag limits and closed seasons differ by country and change — the competent authority decides; this is not legal advice.
The Mediterranean spearfish is the predator whose name means needle: a Greek word for a short bill has tied it to the garfish, the swordfish and half a dozen coastal languages — and behind it stands a fish that spends its whole life in a single sea. StrikeAhead reads conditions and depth and learns from your catches; the app tells you when it is worth going, and StrikeAhead Pathfinder tells you who to go out with on unfamiliar water — curated, personally checked, with verified catches instead of advertising photos, no paid ranking, and no booking fee for you as an angler.