Broad-banded pipefish

Geographical Origin and Habitat: Dunckerocampus boylei is native to the tropical waters of the Indo-West Pacific. Its distribution range includes parts of the Indian Ocean (Mauritius, Réunion) and extends into the Pacific Ocean down to southern Japan and the Great Barrier Reef. It inhabits dark marine caves, rocky overhangs, and deep crevices along outer reef walls at depths between 15 and 45 meters, where it finds shelter from intense light and strong currents.

Taxonomy and Morphology: Belonging to the family Syngnathidae, subfamily Syngnathinae, genus Dunckerocampus. It features an extremely elongated, slender body protected by bony rings. The snout is tube-shaped, very long and thin, ideal for vacuuming small planctonic crustaceans. Adults reach a maximum length of about 15-16 centimeters. The caudal fin is fan-shaped, red with a white margin.

Social Behavior: It is a shy, slow-moving, and peaceful species. It spends the day hovering inside caves or under rocky ledges, often swimming upside down or vertically. In the wild, it lives in stable pairs. It displays a peaceful and non-aggressive behavior toward other fish, but can show intraspecific territorial aggression if housed with individuals of the same sex.

Coloration and Sexual Dimorphism: The coloration is spectacular and eye-catching: the body is crossed by alternating vertical bands of intense orange-red and yellowish-white. The red caudal fin has a dark center and a bright white margin. There is no visible sexual dimorphism, but males are recognizable during the breeding season as they carry eggs under their abdomen.

Aquarium Setup: Requires a mature marine aquarium of at least 150 liters (approx. 40 gallons) for a pair. The layout must include plenty of live rock arranged to form shaded caves, crevices, and overhangs, mimicking outer reef walls. The water current must be moderate to weak, as these fish are not strong swimmers and would be stressed by overly powerful pumps.

Diet and Feeding: A highly demanding species that is difficult to feed. It feeds exclusively on small live zooplankton. In the aquarium, it requires a constant supply of live copepods, newly hatched brine shrimp nauplii, and microscopic mysis. It is very difficult to train onto frozen food; thus, mature live rock rich in microfauna is vital.

Water Quality: Demands stable water parameters of excellent quality: temperature 23-26°C (73-79°F), pH 8.1-8.4, specific gravity 1.021-1.025, and extremely low nitrates and phosphates. An efficient protein skimmer and regular water changes are necessary to prevent the accumulation of organic compounds harmful to its health.

Compatibility and Cohabitation: Must be housed in dedicated tanks or with extremely peaceful and slow-moving tankmates like small gobies, mandarinfish (Synchiropus), and other pipefish. Avoid fast or aggressive fish (surgeonfish, damselfish) that would consume all the food before it can, leading to starvation. Reef-safe with non-stinging corals.

Aquarium Breeding: Breeding in the aquarium is documented but complex. As with seahorses, the male handles the gestation: the female deposits eggs onto the male's ventral area, where he fertilizes and guards them until hatching. The young are born developed but tiny, requiring live rotifers and copepods to survive.

Risks and Diseases: The main risk is starvation due to food refusal or feeding competition. It is also sensitive to bacterial infections and external parasites. A quiet quarantine tank is recommended to start feeding with live prey and monitor health before introduction to the display tank.