William Carmichael McIntosh (1838–1931) was a Scottish physician and marine biologist and the first director of the Gatty Marine Laboratory founded during 1896 in St Andrews. Originally published in 1921 this is the second edition of a work first published in 1899. The text is based on observations made over a number of years during trawling investigations off the coast of Scotland. In a lengthy and rigorous exposition McIntosh argues that the restrictions imposed on trawling in coastal waters by the Fishery Board are unjustified lacking a foundation in scientific data. This book will be of value to anyone with an interest in marine biology and fisheries policy.