Spiny dogfish
The spiny dogfish is a small, well-known shark with a sharp spine in front of each of its two back fins. It lives in shallow and offshore waters in most parts of the world, especially cooler seas, and it is hunted heavily for food. Its spines are its main form of defence.1

Nola ezagutu
- Two spines, one in front of each dorsal (back) fin.1
- No anal fin on the underside.1
- White spots along its back.1
- Greyish brown on both sexes, with countershading (darker on top, paler underneath).1
- Asymmetrical tail lobes, forming a heterocercal tail (the upper lobe is larger).1
Askotan honekin nahasten da: Several shark species share the names dogfish, spurdog and piked dogfish. Spiny dogfish are told apart by having two spines, one in front of each dorsal fin, and no anal fin.1
Pozoi-ahalmena
Arantza zorrotzek daramate pozoia. Zapaltzeak edo heltzeak min ematen du.
Zer egiten du bere pozoiak?
Its dorsal spines secrete a mild venom. The spines are driven into an attacker when the shark arches its back.1
Zein arriskutsua da pertsonentzat?
Arriskua pertsonentzat: MingarriaBenetan min handia eman dezake, baina ia inoiz ez da larria.Zer egiten du beldurtzen denean?
If it is caught, it arches its back to pierce its captor with the spines near its dorsal fins.1
Bere arantzek zulatzen bazaituzte
- Sartu zauria ur beroan, pertsonak erre gabe jasan dezakeen bezain beroan (probatu zure eskuarekin), 30 eta 90 minutu artean. Lortu mediku-laguntza, batez ere harri-arrain eta bastangen kasuan.
Deitu beti lehenik zure larrialdi-zenbakira (112, 000, 911). Lehen sorospenei buruzko orientabide orokorra da hau, ez mediku-aholkua. Lehen sorospenen oinarriak
Egon seguru
- Ez ukitu, ez harrapatu eta ez zirikatu inoiz animalia basati bat, txikia izan arren, eta lo edo hilda dagoela badirudi ere.
- Utzi tartea. Bat aurkitzen baduzu, egon lasai, egin atzera poliki eta utzi bere bidetik joaten.
- Bere arantzek zulatzen bazaituzte: egon lasai, egon geldi, deitu zure larrialdi-zenbakira (112, 000, 911) edo joan ospitalera azkar. Gogoratu nolakoa zen, argazki batek laguntzen du.
Ez dabil zure atzetik. Pozoia janaria harrapatzeko edo bere burua babesteko erabiltzen du, eta askoz nahiago du ezkutatu. Seguru egoteari buruz gehiago
Munduko zein tokitan?
Zein handia da?
Zein luzea da?
1,5 etxeko katu muturretik buztanera jarrita bezain luzea
5 banana bata bestearen atzetik jarrita bezain luzea
igerileku handi baten luzera (50 m) igerian egin lezake 9 segundotanZein handia da Spiny dogfish ZUREKIN alderatuta?
Matematika hutsa zure nabigatzailean. Ez da ezer gordetzen, ezta inora bidaltzen ere.
Zein azkarra da?
Datuak
Dogfish sharks have one of the longest pregnancies of any organism, lasting around 18 to 24 months.1
Spiny dogfish hunt in packs that can range up into the thousands.1
In England, dogfish are sold in fish and chip shops as 'huss', and used to be sold as 'rock salmon' until that term was outlawed.1
Spiny dogfish are popular dissection specimens in high schools and universities because they are easy to get and have small, cartilaginous skulls.1
Squalus acanthias fossils from the Miocene of Denmark and the Netherlands date from about 11 million years ago.1
Males are identified by a pair of modified pelvic fins called claspers, which they use to transfer sperm to the female.1
Mito-hauslea
Mitoa: All animals called dogfish or spurdog are the same species.
Egia: These common names can apply to several species. Spiny dogfish are identified by their two spines, one in front of each dorsal fin, and by having no anal fin.1
Pozoi-adituentzat
- Izen zientifikoa
- Squalus acanthias
- Taldea
- Arrain pozoitsuak
- Familia
- Squalidae2
- Ordena
- Squaliformes
- Kontinenteak
- Ozeano Atlantikoa, Ozeano Barea, Ozeano Indikoa, Mediterraneo itsasoa, Hegoaldeko Ozeanoa, Ozeano Artikoa, Antartika, Ipar itsasoa, Ozeanoak
- Kumeak
- The eggs develop inside the mother and the pups are born alive, with about 5 to 6 in each litter; gestation can last from around 18 to 24 months, one of the longest of any organism.1
- Nola dagoen naturan
- Vulnerable globally; Critically endangered in the Northeast Atlantic1
- Arriskua pertsonentzat
- 2 / 5: Mingarria3
Datuak nondik datozen
- Spiny dogfish (Wikipedia (CC BY-SA 4.0))
- Squalus acanthias (iNaturalist): izenak eta sailkapena.
- Venom Wiki: arrisku-maila, ohiko tamaina eta abiadura-kalkulua geureak dira. Ikusi nola kalkulatzen ditugun: Nola baloratzen dugun arriskua.
Orrialde honetako datu bakoitzak zenbaki bat du, bere iturrira eramaten zaituena. Zerbait gaizki badugu, barkatu, animalien zaleak gara, ez zientzia-aldizkari bat. Esaiguzu [email protected] helbidean eta konponduko dugu.
Arantza pozoitsuak

