Quote from Facebook:
Spring is here! It’s said that when the ice melts, fish tend to jump on hooks! Take part in the new event, The Spring Thaw, and win amazing rewards! The Spring Thaw’ takes 3 days and is not a part of the Ancient Series. The next part of the Series will take place at the end of March. Keep up to date and check your inbox in the game for new messages! Have good catches!