Longfins

Longfins is a common name that can refer to several different species of fish characterized by their elongated fins. This term is not a strict taxonomic classification but rather a descriptive one used in common parlance.

One notable group that might be referred to as longfins are certain species of damselfish, particularly within the genus *Chromis*. These fish are often found in tropical coral reefs and are known for their gracefully flowing dorsal and anal fins, which can appear disproportionately long compared to their body size. They are typically small, schooling fish, often observed in large numbers.

Another context for "longfins" can be found among some species of freshwater fish. For example, certain varieties of guppies or mollies, particularly those selectively bred for aquarium purposes, may develop exceptionally long and ornate fins. These traits are often a result of artificial selection by fish keepers.

The specific species or group being referred to as "longfins" will depend heavily on the geographical location and the context in which the term is used. Regardless of the specific fish, the defining characteristic is the presence of unusually long fin structures, which can play roles in swimming, display, or sensory perception.