One hand on the dorsal (top) fin and the other holding the body from below (Poisson et al, 2012)

Both hands holding the body (Poisson et al, 2012)

One hand on the pectoral (side) fin and the other holding the tail (Poisson et al, 2012)

Release the fish by pointing its head down towards the water and dropping it in (Poisson et al, 2012)