Dwarf Goby (Indo-Pacific Larval stage)
Eviota sp.
Type: saltwater, reef fish, benthic
Physical Characteristics
Elongated, slender body typical of gobiids. This specimen is in a post-larval or early juvenile stage, appearing translucent with visible internal structures. It features a large, dark eye relative to its head size and small melanophores (pigment spots) forming faint vertical bars or a lateral line along the body. Two dorsal fins are present, and pelvic fins are typically fused into a sucking disk.
Habitat & Distribution
Widely distributed across tropical and subtropical Indo-Pacific coral reefs. Adults are benthic, living among coral rubble, reef crevices, or seagrass beds from the intertidal zone down to 30 meters.
Size & Weight
Adults are among the world's smallest vertebrates, typically ranging from 10 to 20 mm in total length. Weight is negligible, often less than 1 gram.
Similar Looking Species
Trimma species (Pygmy gobies), which are similarly small but often have different fin ray counts and more vibrant adult coloration. Larval blennies can look similar but usually have a more continuous dorsal fin.
Ecological Role
Functions as a significant source of biomass for reef predators. Despite their tiny size, their rapid growth and high turnover rates mean they contribute substantially to the reef food web as a primary prey source.
Diet
Suction feeder consuming small zoo-plankton, harpacticoid copepods, and other tiny benthic invertebrates.
Behavior
Generally solitary or found in small groups. They exhibit 'micro-movements,' darting short distances before resting on the substrate. Most species are diurnal and highly territorial over their small patch of reef.
Reproduction
Short life cycles (some living only 59 days). They are often hermaphroditic or exhibit plastic sexuality. Females lay demersal eggs in crevices which are then guarded by the male until the planktonic larvae hatch.
Conservation Status
Data Deficient / Least Concern (species dependent). Most Eviota species are common, though their habitats are threatened by coral bleaching.
Identification Tips
Look for the tiny size and the characteristic goby 'sit and wait' posture. In larval stages, look for the double dorsal fin and the specific arrangement of melanophores along the ventral and dorsal edges of the tail.
Interesting Facts
Members of the Eviota genus include some of the shortest-lived vertebrates on Earth. Their entire life from birth to death can occur in less than two months.
Identified on: 5/20/2026
Mode: Standard