Catalyzes the transport of triglyceride, cholesteryl ester, and phospholipid between phospholipid surfaces. Required for the secretion of plasma lipoproteins that contain apolipoprotein B. Heterodimer; heterodimerizes with the protein disulfide isomerase. Interacts with apolipoprotein B. In juvenile fish, high level of expression in liver, intestine, kidney and muscle, and very low levels in heart, spleen and gill. By elevated dietary lipid levels in the intestine of the juvenile fish.