Deepwater Squirrelfish

Handle with care

Sargocentron megalops

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Description

Sargocentron megalops, commonly known as the Deepwater Squirrelfish, is a species of squirrelfish belonging to the family Holocentridae. It is characterized by its relatively large eyes, typical of deepwater inhabitants, and a generally reddish coloration. This species is part of a diverse family known for their nocturnal habits and often spiny bodies.

Physical Characteristics

Body shape: compressed
Coloration: Predominantly reddish to silvery-red, often with faint longitudinal stripes or mottling. Fins may have reddish hues. The large eyes are a prominent feature.
Scale type: ctenoid
Mouth position: terminal
Distinctive features: Large eyes, characteristic of deepwater species, Strongly ctenoid scales, A prominent spine at the angle of the preopercle (cheek bone), Deep body, laterally compressed
Dorsal fin: Single dorsal fin, deeply notched, with 11 spines followed by 12-14 soft rays. The spiny portion is typically longer than the soft-rayed portion.
Tail fin: Moderately forked caudal fin.
Pectoral fin: Pectoral fins are relatively short, with 13-15 rays.
Distinctive fins: Anal fin with 4 spines and 8-9 soft rays. Pelvic fins with 1 spine and 7 soft rays.

Identification Tips

Eyes

Unusually large eyes relative to body size, indicative of its deepwater habitat.

Coloration

Overall reddish to silvery-red body color, which can appear darker in deeper waters.

Preopercular Spine

Presence of a strong, sharp spine on the lower margin of the preopercle (gill cover).

Dorsal Fin

A single, deeply notched dorsal fin with a prominent spiny anterior portion.

Habitat

Water type: saltwater
Depth: Typically found in depths ranging from 50 to 200 meters (164 to 656 feet), occasionally shallower or deeper.
Environment: Associated with rocky reefs, seamounts, and continental slopes. Prefers areas with complex structures for shelter.
Geographic range: Indo-Pacific region, including areas from East Africa to the central Pacific, north to Japan, and south to Australia.

Aquarium Information

Care level: advanced
Temperament: semi-aggressive
Diet: carnivore
Minimum tank size: 120 gallons
Temperature: 72-78°F (22-26°C)
pH level: 8.1-8.4
Hardness: 8-12 dKH
Compatibility: Best kept with other large, semi-aggressive fish. Avoid keeping with very small or docile species. May prey on smaller invertebrates.
Special requirements: Requires a tank with ample rockwork for hiding during the day and open swimming areas for nocturnal activity. Dim lighting is preferred, especially during initial acclimation. A varied diet of meaty foods is essential.

Wild Information

Conservation status: least concern
Seasonality: No specific seasonal patterns for availability; generally caught incidentally.
Market price: N/A
Commercial importance: low
Taste: Mild, white flesh
Texture: Flaky
Cooking methods: fried, baked, steamed
Nutritional value: Good source of protein and omega-3 fatty acids.

Key Facts

Nocturnal Hunterbehavior

Like most squirrelfish, Sargocentron megalops is primarily nocturnal, emerging from its hiding spots at night to feed.

Deepwater Adaptationevolution

Its exceptionally large eyes are an adaptation to the low light conditions of its deepwater habitat, allowing it to gather more light for vision.

Sound Productionbehavior

Squirrelfish are known to produce sounds, often described as grunts or clicks, using their swim bladder and associated muscles, likely for communication or defense.

Safety Information

Handle with care

Safety level: caution
Venomous: No
Edibility: edible
Handling notes: Squirrelfish, including Sargocentron megalops, possess sharp spines on their dorsal fin, anal fin, and particularly a strong spine on the preopercle. These spines can inflict painful punctures. Handle with care, preferably using gloves or a towel, to avoid injury. While not venomous, secondary infections can occur from punctures.

Similar Species

Bigeye Squirrelfish

Sargocentron spiniferum

Sargocentron spiniferum typically has a more pronounced red coloration, often with white streaks, and a larger maximum size. Its preopercular spine is also very strong, but S. megalops is generally found in deeper waters and has proportionally larger eyes.

Violet Squirrelfish

Sargocentron violaceum

Sargocentron violaceum has a more purplish-red hue and often distinct white spots or lines. It is generally found in shallower reef environments compared to S. megalops.

Scientific Classification

Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Beryciformes
Family: Holocentridae
Genus: Sargocentron
Species: megalops

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