COMPARISON OF AGE ESTIMATES FROM VARIOUS HARD PARTS FOR REDFIN PERCH, Percafluviatilis, IN TASMANIA
Abstract: Whole otoliths,
sectioned otoliths, scales and vertebrae were used to select the most suitable
for age determination of redfin perch, Percafluviatilis. Redfin perch were
sampled from Trevallyn Lake and Brushy Lagoon using fyke nets, gillnets,
electrofishing and rod and line angling. Age estimates were assessed for
comparison between readings and among structures. One-wayANOVA of readability
scores highlighted that sectioned otolith was the most obvious compare to other
hard parts. Sectioned otoliths also showed the highest (93.9%) agreement
between readings, followed by vertebrae (68.7), scales (38.8) and whole
otoliths (29.9). Furthermore, there were no significantly different (p>0.05)
between first and second readings from sectioned otolith and vertebrae but
significantly different (p <0.05) to those from scales and whole otoliths.
When sectioned otoliths’ ages were compared with other structures, vertebrae
showed the highest (47.6%) agreement to those followed by scales (25.2%) and
whole otoliths (20.4%). Age estimates from sectioned otoliths were
significantly different (p<0.05) to the values obtained from vertebrae,
scales and whole otoliths.This finding demonstrated that sectioned otoliths are
the best hard part for age determination for redfin perch in Tasmania.
Keywords: Hard parts;
one-wayANOVA; age determination
Author: Irwan Jatmiko, James
Haddy, Mike Williams
Journal Code: jpperikanangg130038
