To ensure that age determination becomes a reliable element of the assessments underlying the scientific management advice on fisheries and environmental resources, it is of paramount importance to have validation techniques that ascertain that an age determination method is sufficiently accurate. The age validation operates on two different levels; in a narrower sense the term is used to confirm the identification of annual zones in parts of the otolith, and in a wider sense, the term is used to prove that the whole age determination procedure is accurate. Validation of an age procedure indicates that the method is unbiased based on objective validation criteria.
Age validation studies usually provide information of accuracy for only part of the age-span, geographic distribution area, and ambient climatic conditions of a fish population. Such studies must therefore be seen as part of a long-term process of establishing and refining methodologies that provide accurate age information for all ages and all parts of the species range. Further, studies may be considered as truly validation, securing that the method on average provides accurate age estimates, or as corroboration, providing support but not conclusive evidence for one particular method.
Although the term validation, in relation to calcified structures, usually refers to the age estimates, it may also be used with reference to other information captured in the structure. This includes e.g. validation that a given method of shape analysis provides accurate splitting of unit stocks, and that a given trace element analyses provide accurate information of the individuals association with specific water masses.
This workshop aims to update participants on available tools in validation of age, as well as other interpretations made from calcified structures of marine organisms. The WS will also provide examples of their use for selected species. In particular, the WS will examine closer some of the main challenges identified below:
The WS invites contributions, both orally and poster presentations, on all of the above topics. The time frame is to focus on age validation before lunch and validation of other interpretations (stock identity, distribution history) after lunch.
Please record your interest through the Symposium web-site.
0900-1030 Oral presentations
1030-1100 Posters and coffee
1100-1230 Oral presentations
1230-1400 Lunch with presentations from scientific equipment enterprises
1400-1530 Oral presentations
1530-1600 Posters and coffee
1600-1700 Oral presentations
1700-1800 Final discussions and summing up