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Epigonus telescopus, commonly known as the Deepwater cardinalfish, is a mesopelagic to bathypelagic fish species belonging to the family Epigonidae. It is characterized by its relatively large eyes, dark coloration, and streamlined body adapted for life in deep-sea environments. This species is an important component of deep-sea ecosystems, often forming aggregations.
Physical Characteristics
- Body shape
- elongated
- Coloration
- Generally dark brown to black, often with a purplish or iridescent sheen, particularly on the operculum and flanks. The fins are typically dark.
- Scale type
- cycloid
- Mouth position
- terminal
- Distinctive features
- Very large, prominent eyes, adapted for low light conditions., Two distinct dorsal fins., A relatively large mouth extending to below the eye., Smooth, cycloid scales.
- Dorsal fin
- Two dorsal fins; the first dorsal fin has 7-8 spines, and the second dorsal fin has 1 spine and 9-11 soft rays. The two fins are distinctly separated.
- Tail fin
- Caudal fin is forked.
- Pectoral fin
- Pectoral fins are moderately long, with 16-20 rays.
- Distinctive fins
- Pelvic fins are thoracic, with 1 spine and 5 soft rays.
Identification Tips
Eyes
Look for exceptionally large, almost telescopic eyes, which are a key adaptation to its deep-sea habitat.
Coloration
Its uniform dark brown to black body color is characteristic, often with a subtle metallic sheen.
Dorsal Fins
Note the presence of two clearly separated dorsal fins, with the first being spiny and the second having one spine and soft rays.
Body Shape
The body is elongated and somewhat compressed, typical of many deep-sea fish.
Habitat
- Water type
- saltwater
- Depth
- Typically found at depths ranging from 300 to 1200 meters (980 to 3,900 feet), but can occur from 75 to over 2000 meters.
- Environment
- Benthopelagic or mesopelagic to bathypelagic zones, inhabiting continental slopes, seamounts, and oceanic ridges. Prefers cold, deep waters.
- Geographic range
- Widespread in temperate and tropical waters of the Atlantic, Indian, and Pacific Oceans. Found in the Mediterranean Sea, off the coasts of Europe, Africa, North and South America, Australia, New Zealand, and Japan.
Aquarium Information
- Care level: expert
- Temperament: peaceful
- Diet: carnivore
- Minimum tank size: Not suitable for home aquaria due to deep-sea habitat requirements.
- Temperature: Not applicable for aquaria
- pH level: Not applicable for aquaria
- Hardness: Not applicable for aquaria
- Compatibility: Not applicable for aquaria
- Special requirements: Requires extreme deep-sea conditions (high pressure, low temperature, absence of light) that are impossible to replicate in a home aquarium. Not kept in captivity.
Wild Information
- Conservation status: least concern
- Seasonality: No specific seasonal patterns for commercial fishing are widely reported, as it is typically caught as bycatch or opportunistically in deep-sea fisheries year-round.
- Market price: Variable, often low due to deep-sea fishing costs and limited market demand for this specific species.
- Commercial importance: low
- Taste: Reported to have a mild, somewhat oily taste.
- Texture: Soft, flaky flesh.
- Cooking methods: Baked, Steamed, Fried
- Nutritional value: Good source of protein and omega-3 fatty acids, typical of deep-sea fish.
Key Facts
Deep-Sea Visionbehavior
The Deepwater cardinalfish possesses exceptionally large eyes, which are an adaptation to gather the maximum amount of residual light in the dimly lit mesopelagic and bathypelagic zones.
Schooling Behaviorbehavior
This species is known to form dense aggregations, particularly around seamounts and continental slopes, which may aid in feeding and predator avoidance.
Dietary Generalistbehavior
Its diet primarily consists of zooplankton, small crustaceans (like copepods and euphausiids), and small cephalopods, reflecting its opportunistic feeding strategy in the deep sea.
Wide Distributioninteresting
Epigonus telescopus has one of the widest distributions among deep-sea fish, found in all major oceans, highlighting its adaptability to various deep-sea environments.
Safety Information
Safe- Safety level: safe
- Venomous: No
- Edibility: edible
- Handling notes: No specific handling precautions are required beyond standard fish handling practices. No venomous spines or toxic properties are known.
Similar Species
Slender cardinalfish
Epigonus denticulatus
E. denticulatus generally has a more slender body, smaller eyes relative to its head size, and typically fewer gill rakers than E. telescopus. Coloration can also be slightly lighter.
Smallmouth cardinalfish
Epigonus constanciae
E. constanciae has a smaller mouth that does not extend as far back as in E. telescopus, and often has a more silvery or reddish hue compared to the darker E. telescopus.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Perciformes
- Family
- Epigonidae
- Genus
- Epigonus
- Species
- Epigonus telescopus
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