Selene vomer
Source: Kattegat Centeret - Kasper Hareskov Tygesen


Latin name Selene vomer
Common name Threadfin Lookdown
Family Carangidae - Selene
Origin West Atlantic
Max length 48 cm (18.9")

As aquarium fish

Minimum volume 2000 l (528 gal)
Hardiness Hardy
Suitable for aquarium Suitable with care
Reef safe Reef safe with caution
Aggressiveness Peaceful


  • Larger crustaceans (Shrimp, crabs...)
  • Other invertebrates
  • Fish

Threat towards crustaceans

This species poses a threat towards shrimps and crabs etc., which are relatively small.

Can be a threat to small fish

This spicies might be a threat to smaller fishes.

Demand a very large aquarium when fully grown

This species needs a very large aquarium when fully grown.

Exactly how big the aquarium should be is hard to say, but the size of this species is such, that it cannot normally be kept in a home aquarium.

Be careful with the skin when catching these fish

This species has a vulnerable skin, take extra care when catching or transporting, so the skin doesn´t get damaged.

Frequent feeding

This fish requires feeding several times a day, especially when newly added.

When the fish can find its natural food in the aquarium it requires less frequent feeding. 

Requires a varied diet

This species must be fed with an appropriately varied diet.


This species ought to be kept in a group of at least three.

Requires plenty of space for swimming.

This species revels in swimming and requires an aquarium with ample space.

Bred in captivity

This species can be bred in captivity, one can therefore consider asking your local fish store for a captive bred specimen.


These fish are known for their extremely shiny and reflective skin.

Family description (Carangidae)

Jacks/Pompanos are a large fish between 10-40 inch (25-100 cm) long, but some will grow up to 6.5 foot (2 meters).

They are predatory fish, which chase prey in open water and/or look for food on the bottom; crustaceans for example.

Some of the species are suitable for aquaria, but do require a lot of space.

References and further reading

About references

Kenneth Wingerter. 2010. Aquarium Fish: Reconsidering the Lookdown (Selene vomer) - Advanced Aquarist - (English)

Scott W. Michael. 2004. Angelfishes and Butterflyfishes (Reef Fishes Series Book 3) TFH Publications / Microcosm Ltd. - (English)
Bob Fenner. Do You Know Jacks? You Will. The Family Carangidae - Wet Web Media - (English)
WWM Crew. FAQs about Jacks, Family Carangidae - Wet Web Media - (English)


eats shrimp, eats crab, eats fish, shoal group, predatory
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