The Watchman Goby, also known as the Yellow Watchman Goby or by its scientific name Cryptocentrus cinctus, is a popular choice for marine aquariums due to its interesting behaviors, vibrant colors, and symbiotic relationship with pistol shrimp. Here’s a comprehensive overview:
- Appearance:
- The Watchman Goby has a bright yellow body with blue spots on its head and dorsal fin. Its eyes are large and alert, giving it a curious and often comical appearance.
- Size:
- Generally, they grow to about 3-4 inches (7.5-10 cm) in length.
- Natural Habitat:
- This species is found in the Western Pacific, including waters around Australia, Fiji, Indonesia, and the Solomon Islands.
- Tank Requirements:
- A tank of at least 20 gallons (around 75 liters) is recommended. They prefer tanks with a sandy substrate as they like to burrow.
- They also appreciate plenty of live rock for hiding and for establishing territories.
- Diet:
- Carnivorous. They feed primarily on small crustaceans in the wild. In the aquarium, they can be fed a diet of meaty foods like mysis shrimp, brine shrimp, and finely chopped marine meats.
- Temperament:
- They are generally peaceful but can be territorial, especially towards other gobies. However, their most notable behavior is the symbiotic relationship they often form with pistol shrimp.
- Symbiotic Relationship:
- The Watchman Goby often forms a mutualistic relationship with pistol shrimp (also known as snapping shrimp). The shrimp digs and maintains a burrow, which both animals use as a refuge. The goby, with its better eyesight, acts as a lookout for potential threats. When danger approaches, the goby will touch the shrimp with its tail to signal it to retreat into the burrow.
- Reef Compatibility:
- Excellent. They are a good choice for reef aquariums and are generally safe with corals and invertebrates.
- Care Level:
- They are relatively easy to care for, making them suitable for both novice and experienced marine aquarists.
- Lifespan:
- With proper care, a Watchman Goby can live up to 5-6 years in captivity.
- Tankmates:
- They are best kept with other peaceful community fish. While they generally get along well with a variety of tankmates, it’s crucial to monitor interactions when introducing new fish, especially other bottom dwellers or gobies.
The Watchman Goby’s striking appearance, coupled with its fascinating behaviors and relationship with pistol shrimp, make it a unique and engaging addition to many marine aquariums.
