The predicted share of 5–12-year-old mature female and male anadromous whitefish (Coregonus lavaretus) in the catch in the northern (N) and southern (S) Gulf of Bothnia (GoB) in relation to the catch year (1998–2014). The response variable was classified as young (age 2–4) or older (age 5–12 years) fish. The age group, sex and area are predictors (model Tab. A.1). Sample sizes for young and old fish 4620 and 6345 in GoB, respectively.