Quality of the Tuning Series in the Assessment of Greenland Halibut Subarea 2 and Divisions 3KLMNO
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The aim of this paper is to provide a deep study of the quality of the tuning series apply in the Greenland halibut assessment of the NAFO Subarea 2 and Divisions 3KLMNO, as well as to study the feasibility of including the Spanish 3NO survey as tuning fleet in future assessments of this stock. Our results may indicated that the Canadian autumn survey have a clear year effect in the 1995 data for ages older than 6 and that this could be due to the lowest depth coverage of the survey in 1995 compared to 1996-2003. Therefore, shortening the Canadian autumn survey index to 1996-2003 the fit of the data improve and, consequently, we propose to eliminate the 1995 data of this survey in the assessment. The Canadian spring survey showed a big trend in the log q errors of ages 7 and 8, so it could be convenient to study the possibility of shortening the age range of this tuning indices to ages 1 to 6. The study also showed that the fit of the Spanish 3NO survey is not very good for ages ...
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