An illustrated manual for macroscopic determination of Baltic cod reproductive status ...

• Main Authors: Tomkiewicz, Jonna, Kraus, Gerd, Köster, Friedrich W., Schmitz, Cordula
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: ASC 2002 - J - Theme session 2024
• Subjects: Technologies and data; Ecosystem observation, processes and dynamics; Gadus morhua
• Online Access: https://dx.doi.org/10.17895/ices.pub.25442875; https://ices-library.figshare.com/articles/conference_contribution/An_illustrated_manual_for_macroscopic_determination_of_Baltic_cod_reproductive_status/25442875

No abstracts are to be cited without prior reference to the author.The manual has been elaborated with the purpose to improve determination of Baltic cod ( Gadus morhua L.) reproductive status and thereby the data basis for estimation of spawning stock size and reproductive potential. The macroscopic determination is based on a 10-level index scale applied by the Danish Institute for Fisheries Research (DIFRES) and the Institute for Marine Sciences (IFM) onboard research vessels. The method considers that macroscopic staging is a rapid method in the field, but that validation by more accurate measures is a necessity to ensure data quality. The photo documentation of the various stages aims at reducing deviations caused by subjective judgement and thereby further improving the quality of data. ...