The purpose of this research study is to find out what effects (good and bad) that omega-3 fatty acids has on schizophrenia.

The two aims of the study test the hypotheses that correcting omega-3 fatty acid deficiency in the early stages of schizophrenia improves positive symptom treatment response, negative symptom treatment response, and cognition symptom response.

Inclusion Criteria:

• Between the ages of 8-25 years.
• Diagnosis of MDD and not exhibited symptom remission CDRS-R (> 28 but < 40) despite being administered a standard therapeutic dose of an SSRI continuously for a minimum of 6 weeks.
• Ability and willingness to provide assent and informed, written consent from at least one biological parent.
• Present with biological parent or legal guardian.
• Willingness to maintain current dietary habits.
• Permission from treating physician
• Able to perform fMRI/MRS.

Exclusion Criteria:

• Inability or unwillingness to provide consent.
• Antecedent or concurrent serious medical illness.
• Clinically unstable medical disease, including cardiovascular, hepatic insufficiency, severe renal impairment, gastrointestinal, pulmonary, metabolic, endocrine, obesity or other systemic disease.
• History of seizures, excluding febrile seizures in childhood.
• Patients requiring treatment with any drug which might obscure the action of the study treatment.
• Female patients who are either pregnant or lactating.
• Clinically significant laboratory abnormalities in the last year on CBC or TSH tests.
• Judged clinically to be at suicidal risk (defined as having active suicidal ideation, intent or plan, or a serious suicide attempt within the past 6 months, or a baseline CDRS-R suicide score of >3).
• Hospitalized within the last 3 months
• Greater than 1 year outside appropriate age/grade level
• Pacemaker
• Cerebral aneurysm clip
• Cochlear implant
• Metal fragments lodged within the eye or braces
• Claustrophobia
• Necessity of sedation (no sedation will be given).
• History of loss of consciousness > 10 minutes in duration
• Allergy to seafood.