Fotis Giannakoulis, a tanker expert that covers the sector for Morgan Stanley, isn't particularly positive on the sector and thinks a cyclical downturn could last through 2018.Giannakoulis said in a research note on Thursday that there are four reasons to support his views of weak crude tanker fundamentals persisting through 2018: A slowdown in crude production.Lower refinery margins.High crude stocks leading to inventory craws.Rising fleet supply.Full story