Slender Mojarra, Eucinostomus jonesii
The Slender Mojarra, Eucinostomus jonesii, whose common Spanish name is mojarra flaca, is a species in the Mojarra or Gerreidae Family, known collectively as mojarras in Mexico. Globally, there are eleven species in the genus Eucinostomus and all eleven are found in Mexican waters, seven in the Atlantic and four in the Pacific.
The Slender Mojarras have elongated oval bodies that have depths that are 30 to 32% of standard length. They have silvery bodies with no other distinguishing marks. Their head has a pointed snout and a highly protrusible mouth. In fish longer than two inches, the anal fin has three spines. They have a deeply forked caudal fin and a single dorsal fin with 10 rays. Their body is covered with small scales.
The Slender Mojarras form schooling species that reside in coastal areas and are found in sandy areas, within reefs, and on occasion in deeper waters. They reach a maximum length of 20.0 cm (7.9 inches). They are benthic feeders consuming bivalves, invertebrates, and polychaete worms. They are a poorly studied species and very limited information is available about their behavioral patterns.
In Mexican waters the Slender Mojarra are found in all waters of the Atlantic.
The Slender Mojarra is most likely confused with the Mottled Mojarra, Eucinostomus lefroyi (mottled coloration with six wavy lateral lines connected by eight lateral dots).
The Slender Mojarras are too small and too rare to be of interest to most.