Individual growth in Jack mackerel (Trachurus murphyi) of the Southeastern Pacific Ocean using sagitta otolith weight, daily rings, and annual rings

We estimated the growth of Jack mackerel (Trachurus murphyi) using increments daily growth, otolith weight and annual ring reading in sagittal otoliths. The micro-increments were used to fit density radius (n = 4481) then estimate age individual days. parameters von Bertalannfy equation were: maximum theoretical fork length, FL∞ 75 cm; coefficient, K 0.16 year-1; at which fish length is zero, t0= –0.19 years. T. murphyi rings 0.10 year-1, 74.7 cm, t0 –0.50 0.15 75.0 –0.48 parameter with was similar weights. constructed a size-age key for weight, OW (milligrams) as variable was: OW= 0.0323*t-15.197 (r2= 0.68). recommend due this technique statistically reliable, but also cheap fast.