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DescriptionArgentina silas has a fairly elongate body that may reach up to 60 cm in length. It has a small pointed snout, a small mouth and a large eye. It has a tall first dorsal fin located forward of the pelvic fin and a small adipose (fatty) dorsal fin just forward of the tail. The tail fin is small and forked and the pectoral fin is set low on the body. Its scales are fairly strong and rough-edged and a distinct lateral line is present. It is pale geenish yellow in colour with silvery flanks and belly.