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The Hogchoker (Trinectes maculatus) is a small, right-eyed flatfish belonging to the family Achiridae (American soles). It is characterized by its distinctive flat, oval body, cryptic coloration, and unique feeding behavior. Unlike many other flatfishes, it is euryhaline, meaning it can tolerate a wide range of salinities, from freshwater to full marine conditions, and is often found in estuaries and coastal rivers.
Physical Characteristics
- Body shape
- flat
- Coloration
- Dorsal side is typically dark brown to grayish-brown, often mottled with irregular darker spots and blotches, providing excellent camouflage against sandy or muddy bottoms. The ventral side is white or cream-colored. Some individuals may exhibit faint vertical banding.
- Scale type
- ctenoid
- Mouth position
- subterminal
- Distinctive features
- Right-eyed flatfish (both eyes on the right side of the head), Small, oval, and highly compressed body, Fringed dorsal and anal fins that are continuous with the caudal fin, Absence of pectoral fins in adults, Rough, ctenoid scales on the eyed side, smooth on the blind side, Small, subterminal mouth
- Dorsal fin
- Long, continuous fin extending from the head to the caudal fin, with 50-57 rays.
- Tail fin
- Rounded, confluent with the dorsal and anal fins, giving a continuous fringe appearance.
- Pectoral fin
- Absent in adults; present as small vestiges in larvae.
- Distinctive fins
- Anal fin is also long and continuous, with 36-42 rays, joining the caudal fin. Pelvic fins are small and thoracic.
Identification Tips
Eye Placement
Both eyes are located on the right side of the head. This is a key differentiator from left-eyed flatfishes.
Body Shape and Size
Small, oval, and very flat body, rarely exceeding 15 cm (6 inches) in length.
Fin Structure
Dorsal, anal, and caudal fins are continuous, forming a fringe around the body. Pectoral fins are absent in adults.
Coloration
Mottled brown to gray on the eyed side for camouflage, white on the blind side.
Mouth
Small, subterminal mouth, adapted for feeding on small benthic invertebrates.
Habitat
- Water type
- brackish
- Depth
- Typically found in shallow waters, from a few inches to about 20 meters (65 feet).
- Environment
- Estuaries, coastal lagoons, tidal creeks, rivers, and occasionally nearshore marine environments. Prefers soft substrates like sand, mud, or silty bottoms where it can burrow and camouflage. Tolerates a wide range of salinities, from freshwater (0 ppt) to full marine (35 ppt).
- Geographic range
- Western Atlantic Ocean, from Massachusetts, USA, south to Florida, and throughout the Gulf of Mexico to Panama. Extends into numerous freshwater rivers and tributaries along this range.
Aquarium Information
- Care level: intermediate
- Temperament: peaceful
- Diet: carnivore
- Minimum tank size: 30 gallons
- Temperature: 68-78°F (20-26°C)
- pH level: 7.0-8.5
- Hardness: 10-25 dGH
- Compatibility: Generally compatible with other peaceful, non-aggressive fish that can tolerate similar water parameters. Avoid housing with very small invertebrates or fish that might be seen as prey.
- Special requirements: Requires a soft, sandy substrate for burrowing, as this is a natural behavior. Good filtration and stable water parameters are crucial, especially when kept in brackish or freshwater. Provide plenty of hiding spots and a varied diet.
Wild Information
- Conservation status: least concern
- Seasonality: Present year-round in its range, with some seasonal movements between freshwater and brackish environments for spawning or feeding.
- Market price: N/A
- Commercial importance: none
- Taste: Mild, slightly sweet
- Texture: Flaky, delicate
- Cooking methods: Frying, Baking, Steaming
- Nutritional value: Low in fat, good source of protein. Not typically consumed due to small size and bony nature.
Key Facts
Euryhaline Masteramazing
The Hogchoker is remarkably euryhaline, capable of living in a wide range of salinities from pure freshwater to full marine conditions, a trait uncommon among flatfishes.
Hog-Choking Legendinteresting
Its common name, 'Hogchoker,' is believed to originate from the historical practice of feeding them to hogs, which would sometimes choke on the fish's bony structure and rough scales.
Right-Eyed Wonderbehavior
Unlike many other flatfish families, Hogchokers are always right-eyed, meaning both eyes migrate to the right side of the head during larval development.
Pectoral Fin Lossevolution
Adult Hogchokers completely lack pectoral fins, a unique adaptation among many fish species.
Camouflage Expertbehavior
Their mottled coloration and ability to rapidly change shades allow them to blend seamlessly with sandy or muddy substrates, making them incredibly difficult to spot.
Safety Information
Safe- Safety level: safe
- Venomous: No
- Edibility: not recommended
- Handling notes: Hogchokers are harmless to handle. Their small size and lack of sharp spines make them safe to pick up. Care should be taken to return them to water quickly if caught.
Similar Species
Fringed Sole
Gymnachirus texae
The Fringed Sole (Gymnachirus texae) has distinct dark bands or blotches that are more pronounced and regular than the Hogchoker's mottling. It also has a more pronounced fringe of skin around its body and lacks scales, having a smooth, naked appearance.
Lined Sole
Achirus lineatus
The Lined Sole (Achirus lineatus) typically has several distinct dark, narrow vertical lines or bands across its eyed side, which are usually absent or much less defined in the Hogchoker. It also tends to have a more rounded body shape and may retain small pectoral fins.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Pleuronectiformes
- Family
- Achiridae
- Genus
- Trinectes
- Species
- Trinectes maculatus
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