Pulse energy directly output from a mode-locked fiber laser approaching one hundred nanojoule is demonstrated. The fiber laser is based on a σ-shaped cavity design. A segment of single polarization Yb-doped large mode area photonic crystal fiber acts as gain medium. A semiconductor saturable absorber mirror is used for self-starting mode-locking operation. The fiber laser works in an all normal dispersion mode-locking regime with no intracavity dispersion compensation introduced in the laser. A long multi-pass cavity is used to reduce the repetition rate of the fiber laser. Direct output pulse energy of 97 nJ with an average power of 1.08 W is achieved at a low repetition rate of 11.1 MHz. The pulse duration is 4.17 ps,which can be extracavity dechirped to 740 fs.