Download FAR 2013/14 Further studies on age validation of Murphy’s mackerel (Trachurus symmetricus murphyi)

Validation of increment periodicity in otoliths of Murphy’s mackerel (Trachurus symmetricus murphyi) using narrow-zone thin section ageing method and the bomb radiocarbon procedure. The relationship between external corrugation/ring counts from whole otoliths and growth zones from transverse thin sections was also studied. Stable radio isotope studies were also carried out to look at the ambient environmental conditions experienced by individual fish throughout their life history.