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The blackmouth shiner (Notropis elanostomus, ST) is a small minnow found in shallow, stationary waters of the Blackwater and Shoal river systems.  They have a sharply upturned mouth with a dark stripe stretching horizontally across the body.  Threats to this species include changes in water quality and quantity, dredging, pollution, impoundments, and habitat alteration.

The bluenose shiner (Pteronotropis welaka, ST) is a small, olive-colored shiner with dark and amber stripes and a blue “nose” in adults.  They occur in streams in northwest and northeast Florida, with no known occurrences between the St. Johns and Apalachicola rivers.  They inhabit clear to turbid waters with deep pools or holes and areas with varying densities of vegetation.  Threats to this species include changes in water quality and quantity, dredging, pollution, impoundments, and habitat alteration.

The crystal darter (Crystallaria asprella, ST) is a slender, translucent fish with four dark saddles and forked caudal fin.  They are found in deep, flowing waters of large creeks and rivers.  In Florida, they are only known to occur in the Escambia River.  Threats to this species include habitat modification, human disturbance, and exploitation by the aquarium trade.

The saltmarsh topminnow (Fundulus jenkinsi, ST) is a small minnow with 1 to 2 rows of many dark spots along its sides.  It inhabits cordgrass and needlerush marshes.  In Florida, it is found in Perdido Bay and Pensacola/Escambia Bay.  Its limited geographic range and small population in Florida make it vulnerable to threats such as dredging, habitat alteration, pollution, and urbanization.

The Okaloosa darter (Etheostoma okalossae, FT) is found in Okaloosa and Walton counties.  It is green-yellow to red-brown with 5 to 8 markings on its side and a spot at the base of its pectoral fin.  Okaloosa darters live in small streams fed by ground water seepage from adjacent sandhills.  The primary threat to this species is the introduction of the brown darter with which it competes for food and space.

The southern tessellated darter (Etheostoma olmstedi maculaticeps, ST) is a tan darter patterned with 9 to 11 markings.  It inhabits small to medium streams with a variety of habitats, such as sand, mud, silt, and gravel bottoms.  In Florida, it has only been found in the Ocklawaha River Basin.  Its primary threats are pollution, habitat alteration, reduced flows, predation, and competition.

The Atlantic sturgeon (Acipenser oxyrinchus, FE) inhabit freshwater as juveniles and saltwater as adults.  The Florida distribution is along the Atlantic coast of North and Central Florida and the St. Marys and St. Johns rivers.  Their primary threats are poor water quality, fishery by-catch, and habitat degradation.

The Gulf sturgeon (Acipenser oxyrinchus desotoi, FT) is found in the northern Gulf of Mexico and rivers of Florida.  They spend most of the year in freshwater where they breed and migrate to saltwater in the fall.  They were once overfished, but now their primary threats are habitat degradation and any obstacles that would prevent sturgeon from reaching their spawning areas.

The shortnose sturgeon (Acipenser brevirostrum, FE) are found in the St. Marys and St. Johns rivers.  The main threat to the survival of this species is also habitat degradation and any obstacles that would block access to historical spawning grounds.

The smalltooth sawfish (Pristis pectinata, FE) is found off the coast of southwest Florida and along the Atlantic Coast north of Indian River Lagoon.  Females give birth in estuaries during April and May.  Adults are typically found in open water habitats.  Threats include fishing by-catch, entanglements, and habitat destruction.