Book excerpt: Alexander Fenton writes on the uses of shellfish as a way of examining the relationship between small-scale and large-scale fishing, and Ian Morrison investigates boat types in Shetland and in the Scandinavian islands. Shetland is explored again by Brian Smith's exposition of local fishing tenures. Gordon Jackson investigates the DPL shipping line before 1840 and Anthony Slaven writes about the business leaders in the great ship building firms of the Clyde. Robert Prescott breaks new ground by describing the Lascar seamen who were the origin of the Asian community in Glasgow, and Christopher Harvie and Stephen Maxwell write jointly on the political impact of North Sea oil.