No, not really. The main reason that Omega-3 supplementation is prescribed by Kiefer is because of the studies that have suggested that when supplemented in relatively large doses (>5g) DHA and EPA can enhance the hypertrophic signals associated with resistance training.
Actually I believe Kiefer stated in the CBL book that he was skeptical on fish oil's cardiovascular benefits as well. However, as mrjiggly pointed out, we take fish oil to lower the viscosity of cell membranes so tGLUT can be translocated more effectively.