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Glossary

Morphometry

• Otolith Total Length (LO): the greater distance between the anterior/posterior axes.
• Otolith Total Height (HO): the greater distance between the dorso/ventral axes.
• Otolith Total Thickness (TO): the greater distance of the medial and lateral faces.
• Otolith Weigth (WO): otolith mass.
• Area (A): measure of the otoliths surface.
• Perimeter (Pe): value of contour line of the otolith.
• Circularity (Ci): measures the similarity of the structure in relation to a perfect circle, considering its minimum value 4 pi ((Ci = P²/A), where Ci= circularity, P²= perimeter, A= Area).
• Rectangularity: measure of the ratio between the area and the length/height, considering the value 1 as a perfect rectangle ((Re=A/OLxHO), where Re= rectangularity, A= Area, OL= otolith total length, HO= otolith total height).

The shape indices are calculated by the following formulas:

• OL / TL % = OL / TL * 100
• OH / OL % = OH / OL * 100
• OT / OL % = OT / OL * 100
• OT / OH % = OT / OH * 100