Trimma

Common Names

Species within the genus Trimma are commonly called "pygmy gobies", "shrimp gobies", or simply "gobies".

Characteristics

Trimma gobies are typically small, reaching a maximum length of 5 cm (2 inches). They are characterized by their slender, elongate bodies, large eyes, and a distinctive dorsal fin with a distinct, separate anterior spine. Their coloration is highly variable between species and can include vibrant reds, oranges, yellows, blues, and greens.

Environments

Trimma gobies inhabit a wide range of shallow marine environments, including coral reefs, rocky shores, and seagrass beds. They are often found in association with specific invertebrates, particularly shrimps, which they may mimic in appearance and behavior. Their diet typically consists of small invertebrates, such as copepods, amphipods, and algae.

Behavior

Trimma gobies exhibit a range of interesting behaviors, including:

• Symbiotic Relationships: Many species live in a symbiotic relationship with shrimp, where the goby provides a warning system for the shrimp while the shrimp digs and maintains a burrow for both organisms.
• Mimicry: Some species mimic the appearance and behavior of their host shrimp, making them even more effective at avoiding predators.
• Aggressive Territoriality: Trimma gobies are often highly territorial, defending their burrows and feeding areas from other gobies.

References

• FishBase
• World Register of Marine Species
• Wikipedia: Goby