TY - JOUR
AU - Arancibia, Hugo
AU - Cisterna, Lilian
AU - Sepúlveda, Aquiles
PY - 2021/06/30
Y2 - 2022/01/20
TI - Individual growth in Jack mackerel (Trachurus murphyi) of the Southeastern Pacific Ocean using sagitta otolith weight, daily rings, and annual rings
JF - Gayana
JA - Gayana
VL - 85
IS - 1
SE - Original Articles
DO -
UR - https://gayana.cl/index.php/gn/article/view/255
SP - 95-102
AB - <p>We estimated the growth of Jack mackerel (<em>Trachurus murphyi</em>) using increments of daily growth, otolith weight and annual ring reading in sagittal otoliths. The daily micro-increments were used to fit ring density to the otolith radius (n = 4481) and then to estimate the age of the individual in days. The parameters of the von Bertalannfy growth equation were: maximum theoretical fork length, FL<sub>∞</sub> = 75 cm; individual growth coefficient, K = 0.16 year<sup>-1</sup>; theoretical age at which fish length is zero, t<sub>0</sub>= –0.19 years. The growth parameters of <em>T. murphyi</em> estimated using annual rings reading were: K = 0.10 year<sup>-1</sup>, FL<sub>∞</sub> = 74.7 cm, t<sub>0</sub> = –0.50 years. The growth parameters estimated using otolith weight were: K = 0.15 year<sup>-1</sup>, FL<sub>∞</sub> = 75.0 cm, t<sub>0</sub> = –0.48 years. The parameter K estimated with the daily micro-increments was similar to the K estimated using sagittal otolith weights. We constructed a size-age key for <em>T. murphyi</em> using otolith weight, OW (milligrams) as a variable was: OW= 0.0323*t-15.197 (r<sup>2</sup>= 0.68)<em>.</em> We recommend using otolith weight to estimate age in <em>T. murphyi</em> due to this technique is statistically reliable, but also cheap and fast.</p>
ER -