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The Spot (Leiostomus xanthurus) is a small, estuarine-dependent sciaenid fish, highly valued both commercially and recreationally along the Atlantic and Gulf coasts of the United States. It is characterized by a distinctive dark spot behind the operculum and a compressed, silvery body. This species plays a significant ecological role as a forage fish and a benthic invertebrate consumer.
Physical Characteristics
- Body shape
- compressed
- Coloration
- Silvery body with a greenish-gray to bluish-gray back, fading to a silvery-white belly. Approximately 12-15 faint, oblique dark bars may be present on the upper sides, often fading after capture. The most distinguishing feature is a prominent, dark, circular spot located just behind the upper margin of the operculum (gill cover). The pectoral, pelvic, and anal fins are typically yellowish, giving rise to the alternative name 'yellowfin croaker'.
- Scale type
- ctenoid
- Mouth position
- subterminal
- Distinctive features
- Prominent dark spot behind the operculum., Compressed, oval-shaped body., Slightly inferior mouth., Small, barbels on the chin (often inconspicuous).
- Dorsal fin
- Two dorsal fins; the first is spiny with 10-11 spines, and the second is soft-rayed with 1 spine and 29-35 soft rays. A deep notch separates the two fins.
- Tail fin
- Slightly emarginate to truncate caudal fin.
- Pectoral fin
- Relatively long and pointed pectoral fins, typically yellowish.
- Distinctive fins
- Anal fin with 2 spines and 12-13 soft rays. Pelvic fins are thoracic.
Identification Tips
Opercular Spot
The most reliable identification feature is the single, distinct, dark spot located just behind the gill cover. This spot is almost always present and clearly visible.
Body Shape and Coloration
Look for a silvery, compressed body with a darker back and lighter belly. Faint vertical bars may be present, especially on live specimens.
Mouth and Chin
The mouth is slightly inferior, and while small, inconspicuous barbels are present on the chin, they are not as prominent as in some other croaker species.
Fin Color
The yellowish tint to the pectoral, pelvic, and anal fins can be a helpful secondary identifier.
Habitat
- Water type
- brackish
- Depth
- Typically found in shallow coastal waters, estuaries, and bays, from nearshore to depths of about 60 meters (200 feet).
- Environment
- Prefers soft bottoms (sand, mud, shell hash) where it can forage for benthic invertebrates. Commonly found in seagrass beds, tidal creeks, and near oyster reefs. Juveniles are highly dependent on estuarine nursery habitats.
- Geographic range
- Western Atlantic Ocean, from Massachusetts south to northern Florida, and throughout the Gulf of Mexico to the Bay of Campeche, Mexico. Most abundant from Chesapeake Bay to northern Florida.
Aquarium Information
- Care level: intermediate
- Temperament: peaceful
- Diet: omnivore
- Minimum tank size: 75 gallons
- Temperature: 65-75°F (18-24°C)
- pH level: 7.8-8.4
- Hardness: 1.018-1.025 SG
- Compatibility: Generally compatible with other peaceful, similarly sized brackish or marine species. Avoid highly aggressive or very small tank mates.
- Special requirements: Requires brackish to marine conditions, a sandy substrate for foraging, and good filtration. Can be sensitive to sudden changes in salinity or water quality. Juveniles can tolerate lower salinities.
Wild Information
- Conservation status: least concern
- Seasonality: Abundant in coastal waters and estuaries during warmer months (spring through fall), migrating offshore to deeper waters in winter for spawning.
- Market price: Varies by region and season, generally moderate.
- Commercial importance: medium
- Taste: Mild, sweet, and delicate.
- Texture: Flaky and tender.
- Cooking methods: Frying, Baking, Grilling, Broiling
- Nutritional value: Good source of lean protein and omega-3 fatty acids.
Key Facts
Estuarine Dependentbehavior
Spot are highly dependent on estuaries as nursery grounds for their juvenile stages, making them excellent indicators of estuarine health.
Sound Productionbehavior
Like many members of the Sciaenidae family (croakers and drums), Spot can produce drumming or croaking sounds using specialized muscles vibrating against their swim bladder, particularly during spawning.
Dietary Shiftbehavior
Juvenile Spot primarily feed on zooplankton, while adults shift to a diet dominated by benthic invertebrates such as polychaete worms, small crustaceans, and mollusks.
Winter Migrationbehavior
Adult Spot undertake significant offshore migrations to deeper, warmer waters during the winter months for spawning, returning to coastal estuaries in spring.
Safety Information
Safe- Safety level: safe
- Venomous: No
- Edibility: edible
- Handling notes: Spot are generally harmless to handle. Care should be taken with the spiny dorsal fin, as with any fish, to avoid minor punctures. No venomous spines are present.
Similar Species
Atlantic Croaker
Micropogonias undulatus
Atlantic Croaker typically has several small barbels on its chin that are more prominent than those of the Spot. It also lacks the distinct dark spot behind the operculum and usually has oblique wavy lines on its sides, rather than faint bars.
Silver Perch
Bairdiella chrysoura
Silver Perch lacks the distinct opercular spot and typically has a more elongated body shape. Its mouth is more terminal, and it generally has a more uniformly silvery coloration without prominent bars.
Sand Seatrout
Cynoscion arenarius
Sand Seatrout has a more elongated, torpedo-shaped body, a larger mouth with prominent canine teeth, and lacks the opercular spot and chin barbels. Its coloration is typically more uniformly silvery.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Acanthuriformes
- Family
- Sciaenidae
- Genus
- Leiostomus
- Species
- Leiostomus xanthurus
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