The presence of daily growth increments, initiated just after hatchimg, are described in the otoliths of reared Japanese red sea bream Pagrus major (TEMMINCK et SCHLEGEL). Counts deviate within the range of 30% of the mean and the coefficient of deviation varies 6% to 10%. Since there is no significant correlation between the number of increments and the standard length within age groups, it may be concluded that formation of daily increments in the otolith is indep ndent of the growth rate of fish. There is no singnificant difference between counts of increments made on right and left otoliths. Daily increments in the otoliths of field-collected larvae are clearer and easier to count than those of reared ones. Since the main cause of counting error results from the diffculty in distinguishing daily increments accurately. the error in ageing field-collected samples may ne smaller than in ageing reared ones.
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Tsuji et al. (1982) studied this question.