Saltwater Fish
Siganus guttatus
Siganus guttatus
(Orange-Spotted Spinefoot)

Species Description…

Scientific Name: Siganus guttatus
Common Name: Orange-Spotted Spinefoot
Species Group: Rabbitfish
Habitat: Reef Safe with Caution
Care Level: Intermediate
Temperament: Semi-aggressive
Diet Type: Herbivore
Role in Aquarium: Showpiece Fish
Max Fish Length: 18 (inches)
Min Aquarium Size: 125 (gallons)
Native Range: Indo-Pacific
Siganus Guttatus - The Orange-Spotted Spinefoot

Siganus Guttatus (The Orange-Spotted Spinefoot)

Overview

  • Native to the Indo-Pacific, frequently found in shallow coastal waters, coral reefs, and mangrove estuaries.
  • Recognized for its distinctive orange-spotted body and silvery base color, giving it a striking appearance.
  • A peaceful and hardy species that adapts well to aquarium life, provided with proper care.
  • Possesses venomous dorsal spines that can cause a painful sting if mishandled.
  • Best suited for aquariums with ample swimming space, live rock formations, and stable water conditions.

Feeding

  • Herbivorous, primarily grazing on algae, seagrass, and marine plant material in the wild.
  • Thrives on a diet of seaweed, spirulina, algae-based pellets, and frozen herbivore preparations.
  • Helps control nuisance algae growth in aquariums by constantly grazing.
  • Should be fed multiple times daily to support energy levels and promote healthy digestion.
  • A diet rich in plant-based nutrients enhances coloration and supports a strong immune system.

Habitat

  • Prefers reef-associated environments with moderate water currents and abundant plant life.
  • Often seen foraging along coral reefs, rocky outcroppings, and seagrass beds.
  • Aquarium setups should include live rock to provide natural grazing areas and hiding spots.
  • Requires stable water parameters and high-quality filtration to maintain optimal water conditions.
  • Providing a spacious tank encourages active swimming and natural foraging behaviors.

Fish Care

  • Optimal water temperature: 74-80°F (23-27°C) to ensure healthy metabolic function.
  • Preferred pH range: 8.1-8.4, with a salinity level of 1.020-1.025.
  • Requires regular water changes and consistent maintenance to prevent excess algae growth.
  • Reef-safe but may nip at soft corals if not provided with sufficient plant-based food sources.
  • Providing an enriched diet and structured habitat ensures a stress-free and active fish.

Compatibility

  • Peaceful and well-suited for community reef tanks with other non-aggressive species.
  • Compatible with tangs, angelfish, wrasses, and other herbivorous or semi-aggressive fish.
  • Should not be housed with overly aggressive species that may cause stress.
  • Best kept in environments where it has access to ample grazing surfaces.
  • Providing multiple rock formations and swimming space ensures a balanced tank dynamic.

Aquarium Behavior

  • An active and social swimmer that enjoys grazing on algae and plant matter.
  • Frequently seen exploring rock formations and interacting peacefully with tankmates.
  • More confident in a well-established aquarium with stable environmental conditions.
  • Providing a structured environment with hiding areas encourages natural behaviors.
  • Over time, it may become accustomed to its caretaker and actively engage during feeding sessions.