Common name: Equetus

Scientific name: Equetus lanceolatus (Linnaeus, 1758)
Jack-knifefish (Equetus lanceolatus).jacknife fish
Ausgewachsener Ritterfisch an der Küste Bonaireswimpel ritterfisch

General information

The Jackknife Fish, Equetus lanceolatus, is a striking and unique species that adds both beauty and intrigue to a saltwater aquarium. Known for its elongated body and high dorsal fin, the Jackknife Fish is a member of the family Sciaenidae, which includes drums and croakers. This species is recognized by its black and white zebra-like stripes along the body and a distinctive black spot on the dorsal fin.

Details

Recommended minimum tank volume
200 liter (53 gallons)
Salinity
S.G. 1.020 to 1.025
Temperature
24 to 28 °C (75 to 82 °F)
Acidity
pH 8.1 to 8.4
Average size
38 cm (1′3″)
Care level
Moderate to easy Sensitive to water quality.
Diet
Carnivore Prefers live and frozen foods.
Social
Solo Territorial, best kept alone.
Reefsafe
Yes
Aggression
Semi aggresive May be aggressive to small fish.
Captive bred
No

Taxonomy

  1. Kingdom
    Animals
    Animalia
  2. Phylum
    Chordates
    Chordata
  3. Class
    Ray-finned Fishes
    Actinopterygii
  4. Order
    Perch-like Fishes
    Perciformes
  5. Family
    Drums
    Sciaenidae
  6. Genus
    Spotted Drum
    Equetus
  7. Species
    Equetus
    Equetus lanceolatus (Linnaeus, 1758)
  8. Synonyms
    Chaetodon lanceolatus Linnaeus, 1758
    Eques americanus Bloch, 1793
    Eques balteatus Cuvier, 1829

Care

Jackknife Fish require a spacious tank with plenty of hiding places and room to swim. They are generally peaceful but can be territorial with their own kind, so it's best to keep them singly unless the aquarium is large enough to support multiple territories. They thrive on a varied diet of meaty foods such as shrimp, squid, and small fish.

Reproduction

In the wild, Jackknife Fish are known to form spawning aggregations, and males produce a drumming sound to attract females. However, breeding in the home aquarium is rare and not well documented.

Habitat

Native to the Western Atlantic, from Florida and the Gulf of Mexico to Brazil, the Jackknife Fish is typically found in reef environments. They prefer areas with sandy bottoms and coral outcrops where they can forage for food and seek shelter.