Ralf Schwamborn was at ZMT Bremen, Germany, from May 24 to June 22, 2018 and was engaged in tasks 2.1, 2.2, 2.4. He participated in meetings in Martin Zimmer’s working group, regarding ongoing cooperation projects between UFPE and ZMT and new methods. Ralf Schwamborn co-organized the workshop   "Kick-off Workshop Working Group on Length-Based Methods for Population Studies and Stock Assessment" at ZMT Bremen, together with Prof. Matthias Wolff, from May 28 to 30, 2018, and held two talks entitled "Why do we need a Working Group on Length-Based Methods?" and "New Length-Based Methods for Population Studies and Stock Assessments: Open your Minds – and your Confidence Intervals".