They also have a faint golden midlateral line, as well as a black spot on the hind border of their gill covers.

Only after the first year are the rings a reliable indicator of age, because they may be formed due to the reduced feeding activity associated with planktonic scarcity during the rise in temperature of the environment in summer.

This affects the spawning season and means that it may vary from any period between June and December.

The peak period for commercial catch is June and July, when the juvenile fish have fattened themselves to prepare for their first spawning season.

By stage VI, these ovaries fill the body cavity and are made up of large transparent ripe eggs.

The first day of development includes minimal movement, but it travels by serpentine swimming.

On the second day of development, the pigmentation of the larva is stable and the eye coloration stabilizes to a silvery white sheen.