The demography of fishes
Project
Further development of age determination methods for commercial fish species
Age composition data for fish stocks are essential input parameters for stock assessment. It is therefore necessary to permanently develop age determination methodology further.
Background and Objective
Age composition data for fish stocks are essential input parameters for stock assessment. The methodology of age determination is being permanently developed further in order to work efficiently and to reach consistent results. In this respect, state-of-the-art processing methods (e.g. fully automated otolith sectioning machines) and investigation methods (e.g. digital image analysis) are being employed.
In a PhD project, we test artificial intelligence (AI) methods for age determination.
Target Group
Fisheries science
Approach
The age of fish is being determined by counting growth zones in their ear stones (otoliths). Using state-of-the-art processing techniques and image analysis, annual rings (increments) become visible and are used for age determination.
Please see here for details on the utilization of AI methods for age reading.
Preliminary Results
- Various publications, e.g. Stransky, C., Gudmundsdottir, S., Sigurdsson, T., Lemvig, S., Nedreaas, K., Saborido-Rey, F. (2005): Age determination and growth of Atlantic redfish (Sebastes marinus and S. mentella): bias and precision of age readers and otolith preparation methods. ICES J. Mar. Sci. 62: 655-670.
Unser Otolithen-Team!
Age composition data for fish stocks are essential input parameters for stock assessment. It is therefore necessary to permanently develop age determination methodology further.
Thünen-Contact
Involved Thünen-Partners
- Adrian-Schütte, Valeria Institute of Sea Fisheries
- Beußel, Friederike Institute of Sea Fisheries
- Brückner, Hendrik Institute of Sea Fisheries
- Cayetano, Arjay Institute of Sea Fisheries
- Delfs, Gertrud Institute of Sea Fisheries
- Hefter-Siebold, Martina Institute of Sea Fisheries
- Hemken, Gitta Institute of Sea Fisheries
- Wilhelms, Ines Institute of Sea Fisheries
Duration
1.2008 - 12.2027
More Information
Projekt type:
Project status:
ongoing
Publikationen
hits: 4
- Carbonara P, Coad Davies J, Damme CJG van, Aanestad Godiksen J, Allegaert W, Beier U, Bekaert K, Canha A, Farias I, Follesa MC, Gault M, Gillespie-Mules R, Haase S, Hilvarsson A, Hüssy K, Korta M, Krüger-Johnsen M, Krumme U, Stransky C, Ulleweit J, et al (2020) Working Group on Biological Parameters (WGBIOP). Copenhagen: ICES, 150 p, ICES Sci Rep 2(117), DOI:10.17895/ices.pub.7651
- Van der Sleen P, Stransky C, Morrongiello JR, Haslob H, Perharda M, Black BA (2018) Otolith increments in European plaice (Pleuronectes platessa) reveal temperature and density-dependent effects on growth. ICES J Mar Sci 75(5):1655-1663, DOI:10.1093/icesjms/fsy011
- Stransky C, Gudmundsdóttir S, Sigurdsson T, Lemvig S, Nedreaas K, Saborido-Rey F (2005) Age determination and growth of Atlantic redfish (Sebastes marinus and S. mentella): bias and precision of age readers and otolith preparation methods. ICES J Mar Sci 62(4):655-670, doi:10.1016/j.icesjms.2005.01.018
- Stransky C, Kanisch G, Krüger A, Purkl S (2005) Radiometric age validation of golden redfish (Sebastes marinus) and deep-sea redfish (S. mentella) in the Northeast Atlantic. Fish Res 74(1-3):186-197, DOI:10.1016/j.fishres.2005.03.003