The study analyzes the cultural, economic and social processes behind the apparently, unusually strong economic position of “fish mammies”—women fish traders in Ghana. These women invest in fishing equipment and become managers of fishing companies, crossing the gender-defined division of labour between fishing and marketing. One reason for this is changes in technology. The study discusses the struggles that these women face to acquire power in the predominantly patriarchal fishing sector. It points to the necessity of understanding men’s position in fisheries, in marriage, and in other fields of life while discussing women’s change in position. The first four chapters of the book give an historical overview and define entrepreneurship as the crossing of gendered boundaries. The last chapter illustrates how women utilize resources outside the local context—foreign fish supply—in order to expand their fish-based enterprises and enhance their personal prestige.