| Houndfish | 
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| Illustration from The Bahama Islands by The Geographical Society of Baltimore 1905. | 
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| T. c. crocodilus near Réunion | 
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| Scientific classification | 
| Domain: | Eukaryota | 
 
| Kingdom: | Animalia | 
 
| Phylum: | Chordata | 
 
| Class: | Actinopterygii | 
 
| Order: | Beloniformes | 
 
| Family: | Belonidae | 
 
| Genus: | Tylosurus | 
| Species: | T. crocodilus | 
| Binomial name | 
| Tylosurus crocodilus 
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| Synonyms | 
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Belone crocodilus Péron & Lesueur, 1821 
Strongylura crocodila (Péron & Lesueur, 1821) 
Strongylura crocodilus (Péron & Lesueur, 1821) 
Belone coromandelica van Hasselt, 1823 
Belone timucoides van Hasselt, 1824 
Belone raphidoma Ranzani, 1842 
Strongylura raphidoma (Ranzani, 1842) 
Tylosurus raphidoma (Ranzani, 1842) 
Belone gigantea Temminck & Schlegel, 1846 
Strongylura gigantea (Temminck & Schlegel, 1846) 
Tylosurus giganteus (Temminck & Schlegel, 1846) 
Belone annulata Valenciennes, 1846 
Tylosurus annulatus (Valenciennes, 1846) 
Belone gerania Valenciennes, 1846 
Belone melanurus Bleeker, 1849 
Belone cylindrica Bleeker, 1850 
Belone crassa Poey, 1860 
Belone melanochira Poey, 1860 
Belone koseirensis Klunzinger, 1871 
Tylosurus gladius Bean, 1882 
Esox aaveri Curtiss, 1938
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The houndfish, or more specifically the crocodile needlefish (Tylosurus crocodilus) is a game fish of the family Belonidae, the needlefishes. It is the largest member of its family, growing up to 5 feet (1.5 m) in length and 10 pounds (4.5 kg) in weight.