Fishing, the fishing industry, and the regulation and management thereof is in the news as a remaining unresolved topic in the Brexit negotiations. The importance of fishing as a food source and as a means of employment and income generation is long-standing.
By chance I came across a post from the Medievalists.net site which looks at fishing in the medieval centuries, and the variety of ways in which it was carried out. It brings out both its importance to daily life and also the way in which it attracted government regulation from at least the thirteenth century.
This interesting and informative article can be read at Sustainable and Innovative: The Medieval Art of Fishing