Just-published analyses of this vast study
(The Efficacy of Omega-3 Supplementation for Major Depression: A Randomized Controlled Trial, The Journal of Clinical Psychiatry—François Lespérance, MD, PhD; Nancy Frasure-Smith, PhD; Élise St-André, MD; Gustavo Turecki, MD, PhD; Paul Lespérance, MD, MSc; and Stephen R. Wisniewski, PhD.) demonstrated that Omega-3 with high concentrations of EPA is effective among patients diagnosed with depression unaccompanied by an anxiety disorder.

The efficacy of Omega-3 among such patients was comparable to that generally observed for use of conventional antidepressants.
The CHUM study assessed intake of 1 gr per day, which is the same dose delivered by
OM3emotional balance.
The press can get the press release here: