ORANGE ROUGHY OTOLITH GROWTH-RATES - A DIRECT EXPERIMENTAL TEST OF THE ROMANEK-GAULDIE OTOLITH GROWTH-MODEL

Endolymph chemistry (Ca2+, pH, Na+) was measured in 17 orange roughy ( Hoplostethus atlanticus; Teleostei; Trachichthyidae). Theoretical dail y microincrement widths based on the Romanek and Gauldie model of otol ith growth were calculated from the measure of otolith chemistry. Theo retical daily microincrement widths were well-correlated (r(2) = 59%) with the width of the last daily microincrement growing at the posteri or edge of otoliths taken from the sampled fish. (C) 1998 Elsevier Sci ence Inc. All rights reserved.