Conjugated Eicosapentaenoic Acid (CEPA) is a derivative of Eicosapentaenoic Acid (EPA) found with DHA in fish oil.
http://jn.nutrition.org/cgi/content/abstract/137/3/641
Nutrition and Disease
Conjugated Eicosapentaenoic Acid Inhibits Vascular Endothelial Growth Factor-Induced Angiogenesis by Suppressing the Migration of Human Umbilical Vein Endothelial Cells
In this related earlier article CEPA was also found to act as an anti-obesity agent in rats:
http://www.springerlink.com/content/a31846468436635v/
Intake of conjugated eicosapentaenoic acid suppresses lipid accumulation in liver and epididymal adipose tissue in rats