Indian Threadfin Fish

(Alectis indicus)

Alectis Jacks grow quite large and should only be added to very large aquariums preferably zoos or public aquariums. They are very active, strong fish that will bully other tank mates. Provide wide open swim areas with minimal rockwork. Jacks are often found near sandy, muddy bottom regions. Jacks are schooling predatory fish that feed on sedentary or slow moving crustaceans, and fish. Juveniles are sometimes seen in brackish water. There are marked color differences between juveniles and adults.

Indian Threadfin Fish are also sometimes known as the Diamond Trevally, Mirror Fish or Plumed Trevally. Rarely seen in the aquarium trade. Juvenile and adult Indian Threadfin Fish may have different coloration. Juveniles generally are a silver, blue to green color, silver belly and vertical stripes throughout body. Adults are similar but the dorsal, anal, and pelvic are a dark blue to black with other fins having a light green tint. Indian Threadfin Fish can grow to almost 65".

We recommend a minimum aquarium size of 500 gallons or larger for this species.

Water conditions: Salinity 1.020 - 1.025, Temp (F) 72 - 78, pH 8.1 - 8.4, Alkalinity 8 - 12 dKH

  • Care: CareModerateModerate
  • Behavior: BehaviorSocialSocial
  • Diet: DietFrozen FoodFrozen Food DietLive FoodLive Food
  • Habitat: HabitatSand FlatSand Flat HabitatReefReef
  • Light: LightMediumMedium