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The Northern Sennet (Sphyraena borealis) is a slender, predatory marine fish belonging to the family Sphyraenidae, commonly known as barracudas. It is characterized by its elongated, cylindrical body, pointed head, and prominent, sharp teeth. This species is a smaller relative of the larger barracudas, typically found in coastal waters of the western Atlantic.
Physical Characteristics
- Body shape
- elongated
- Coloration
- Silvery-gray to greenish-gray dorsally, fading to white or silvery on the flanks and belly. Often has faint, dusky bars or blotches on the sides, which can be more pronounced in juveniles or when stressed. Fins are typically dusky or yellowish.
- Scale type
- cycloid
- Mouth position
- terminal
- Distinctive features
- Elongated, cylindrical body, Pointed head with a large mouth, Prominent, sharp, canine-like teeth of varying sizes, Two widely separated dorsal fins, Protruding lower jaw
- Dorsal fin
- Two dorsal fins; the first with 5 spines, the second with 1 spine and 9 soft rays. The first dorsal fin originates posterior to the pectoral fin base.
- Tail fin
- Forked caudal fin.
- Pectoral fin
- Short, located low on the body.
- Distinctive fins
- Pelvic fins are abdominal, located beneath the first dorsal fin.
Identification Tips
Body Shape
Very slender and elongated, almost pencil-like, compared to larger barracuda species.
Head and Mouth
Pointed head with a large mouth and a distinctly protruding lower jaw. Teeth are prominent and sharp.
Dorsal Fins
Two widely separated dorsal fins. The first dorsal fin is positioned well behind the pectoral fins.
Lateral Line
A distinct lateral line runs along the length of the body.
Size
Generally smaller than other barracuda species, rarely exceeding 60 cm (24 inches) in length.
Habitat
- Water type
- saltwater
- Depth
- Typically found in shallow coastal waters, from the surface down to about 100 meters (330 feet).
- Environment
- Inhabits estuaries, bays, coastal reefs, seagrass beds, and open coastal waters. Often found near structures or schooling baitfish.
- Geographic range
- Western Atlantic Ocean, from Massachusetts, USA, south to Florida, and throughout the Gulf of Mexico. Also found in the Caribbean Sea and along the coast of Central and South America to Brazil.
Aquarium Information
- Care level: expert
- Temperament: aggressive
- Diet: carnivore
- Minimum tank size: 500 gallons
- Temperature: 72-78°F (22-26°C)
- pH level: 8.1-8.4
- Hardness: 8-12 dKH
- Compatibility: Not suitable for community tanks; best kept alone or with very large, robust, and fast-moving fish that cannot be swallowed.
- Special requirements: Requires a very large tank with ample swimming space. Live or fresh dead fish and crustaceans are essential for diet. Can be prone to stress in confined environments. Not commonly kept in home aquaria due to size and predatory nature.
Wild Information
- Conservation status: least concern
- Seasonality: Present year-round in its range, but more active and accessible in warmer months.
- Market price: Low
- Commercial importance: low
- Taste: Mild, flaky white meat
- Texture: Firm
- Cooking methods: Frying, Grilling, Baking
- Nutritional value: Good source of protein and omega-3 fatty acids. Generally considered safe to eat, though larger barracuda species can carry ciguatera toxin; S. borealis is less commonly associated with this risk due to its smaller size and typical diet.
Key Facts
Ambush Predatorbehavior
Northern Sennets are classic ambush predators, often lurking in seagrass or near structures, waiting for unsuspecting prey to pass by.
Schooling Behaviorbehavior
While larger barracudas are often solitary, Northern Sennets frequently form schools, especially when young, which can be quite large.
Rapid Growthinteresting
Like many predatory fish, Sphyraena borealis exhibits relatively rapid growth, especially in its juvenile stages, to quickly reach a size where it can effectively hunt a wider range of prey.
Dietary Flexibilitybehavior
Their diet primarily consists of smaller schooling fish, but they are opportunistic and will also consume crustaceans and cephalopods.
Safety Information
Handle with care- Safety level: caution
- Venomous: No
- Edibility: edible
- Handling notes: Northern Sennets possess sharp teeth and can inflict painful bites if handled carelessly. Anglers should use caution when de-hooking or handling these fish. While not venomous, their bites can lead to infection. No ciguatera risk is typically associated with this species due to its smaller size and diet, but general caution is always advised with barracudas.
Similar Species
Great Barracuda
Sphyraena barracuda
The Great Barracuda grows significantly larger (up to 2 meters) and typically has more prominent, irregular dark blotches or bars on its sides, which are often V-shaped. Its first dorsal fin originates directly above or slightly anterior to the pelvic fin base, whereas in S. borealis, it's posterior to the pectoral fin base.
Guaguanche
Sphyraena guachancho
The Guaguanche has a more compressed body and typically exhibits a series of faint, oblique dark bars on its upper sides. Its lateral line is less distinct than in S. borealis, and it often has a yellowish caudal fin.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Scombriformes
- Family
- Sphyraenidae
- Genus
- Sphyraena
- Species
- borealis
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