Lucania goodei

Bluefin Killifish

Family: Fundulidae · Class: Teleostei · Order: Cyprinodontiformes

The Bluefin Killifish is a small freshwater fish native to the southeastern United States. Adults typically measure 25-50 mm (1.0-2.0 inches) in total length, making them one of the smaller members of the killifish family Fundulidae. The species exhibits sexual dimorphism, with males displaying more vibrant coloration and distinctive fin characteristics that give the species its common name. The native range of Lucania goodei extends throughout the southeastern coastal plain, primarily in Florida, Georgia, South Carolina, and portions of North Carolina (USFWS 2018). The species naturally inhabits freshwater and low-salinity brackish environments. Introduced populations have been documented in several states outside the native range, including California, Texas, and additional areas of North Carolina and South Carolina (Fofonoff et al. 2018). In California, specimens were collected in 1980 from a lily pond at the north entrance to the Los Angeles County Museum, though this population reportedly survived only briefly (Huang et al. 2003). A separate introduction was documented in the San Dieguito River in southern California (Huang et al. 2003). Bluefin Killifish typically inhabit thickly vegetated shallow waters including marshes, ponds, slow-moving streams, and coastal lagoons. The species demonstrates notable salinity tolerance, with eggs successfully hatching at salinities up to 10 practical salinity units, though hatching success declines significantly at higher salinities of 20-30 PSU (Fuller 2008). They prefer areas with dense aquatic vegetation where they swim well below the surface, utilizing the cover for protection and foraging opportunities. The species feeds primarily on invertebrates, algae, and fragments of aquatic plants including Vallisneria species (Froese and Pauly 2018; Rohde et al. 1994). Their diet makes them important components of aquatic food webs, serving as prey for larger predatory fish. Studies in Florida have documented Bluefin Killifish as prey items for introduced Asian Swamp Eels and Mayan Cichlids (Shafland et al. 2010; Schofield et al. 2019). The species exhibits typical killifish reproductive behavior, though specific spawning details for this species require further documentation. Lucania goodei is not federally listed under the Endangered Species Act as of December 2025. Within its native range, the species appears to maintain stable populations. However, the limited success of documented introductions outside the native range suggests the species may have specific habitat requirements that restrict establishment in non-native environments. In California, the U.S. Fish and Wildlife Service's Lodi Fish and Wildlife Office monitors this species as part of their aquatic invasive species surveillance program, though established populations have not been confirmed in the state's natural waterways.

Data from The California Species Project — 14,000+ California species with verified data from CNPS, CDFW, USFWS, and more.