An adult elver is typically a young eel that has matured into an adult. Some synonyms for an adult elver include silver eel, yellow eel, or black eel. Different regions may have different names for this stage of eel development. In some areas, an adult elver may be referred to as a grig or a greige. These synonyms all refer to the same stage of eel development and are often used interchangeably. The adult elver is an important source of food and income for many coastal communities, and it plays a critical role in the ecosystems of estuaries and rivers.