Description
Catalina Goby (Lythrypnus dalli) is a small, brilliantly colored marine goby recognized for its vivid electric-blue body, contrasting orange-red horizontal stripes, and bright blue markings. Native to the cooler waters of the Pacific coast of North America, it is a peaceful, bottom-dwelling species that spends much of its time perched on rocks and exploring crevices. Unlike most tropical reef fish, the Catalina Goby is a temperate-water species with specialized temperature requirements.
Lighting
Moderate to high
Normal marine aquarium lighting is suitable. Provide shaded areas and rocky structures where the fish can retreat and rest.
Placement (Aquarium Zone)
Lower reef
Provide extensive rockwork, small caves, crevices, and open areas near the substrate. Catalina Gobies prefer to perch on rocks and establish small territories close to the bottom.
Salinity
1.025–1.026 SG
pH
8.1–8.4
Alkalinity
7–9 dKH
Consistency is more important than maintaining a specific value.
Calcium
400–450 ppm
Magnesium
1250–1380 ppm
Flow
Moderate to strong, turbulent flow
Provide well-oxygenated water with good circulation and plenty of rock surfaces for perching. Avoid excessively concentrated flow directly into its preferred hiding places.
Diet
Carnivorous + Frequent Feeding
Catalina Gobies are small micro-predators that naturally feed on tiny crustaceans and zooplankton.
Supplemental foods:
Copepods
Amphipods
Mysis shrimp
Enriched baby brine shrimp
Cyclops
Small zooplankton
Fine frozen marine foods
Small high-quality marine pellets, once accepted
Feed small portions 2–3 times daily. Their small size and active metabolism make regular feeding important.
Moderate
Care Level
Advanced
Reef Compatibility
Reef-safe
Generally compatible with SPS corals, LPS corals, soft corals, zoanthids, and most ornamental invertebrates. It does not normally damage corals or bother larger ornamental shrimp.
Temperament
Peaceful
Generally peaceful toward other reef fish. Males can become territorial toward one another, especially in smaller aquariums. Multiple individuals require adequate space and suitable habitat.
Special Requirements
Maintain a dedicated temperature-controlled temperate marine aquarium.
Provide stable, cool water throughout the year.
Ensure excellent oxygenation and water quality.
Provide mature rockwork with natural microfauna.
Offer frequent small feedings.
Avoid aggressive tank mates and large predatory fish.
Provide caves and small crevices for shelter.
Avoid sudden temperature fluctuations.
