Temperature dependency equation for chub mackerel (Scomber japonicus) identified by a laboratory rearing experiment and microscale analysis

摘要

In this study, juveniles of chub mackerel (Scomber japonicus) were reared from eggs in six different temperature treatments, and their otoliths were subjected to micromilling and microvolume stable oxygen isotope (δ~(18)O) analysis. We determined the δ~(18)O values of otoliths (δ~(18)O_(otolith)) formed at mean temperatures of 16.3, 17.6, 18.3, 20.0, 24.0 and 26.58C and identified a linear relationship between rearing water temperature (T, 8C) and d18Ootolith as follows: δ~(18)O_(otolith (VPDB)) – δ~(18)O_(water (VSMOW))=-0.25 (±0.01)T + 4.46 (±0.21) (R~2 = 0.96, P , 0.01), where VPDB is Vienna Peedee Belemnite, VSMOW is Vienna Standard Mean Ocean Water and the error values in parentheses are standard deviations. This species-specific temperature dependency equation for chub mackerel will enable accurate reconstruction of individual thermal histories and provide essential information for effective resource management.