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Otolith chemical signatures are sufficiently stable across time to allow for accurate stock classification. The classification of the southern Yellow Sea population for    Larimichthys   polyactis    (Bleeker, 1877) and its connectivity with others from 1962 is controversial. The study aimed to study the inter-annual variation in otolith strontium:calcium ( Sr:Ca ) ratios of    L.   polyactis    to determine whether otolith natural tags are representative over long periods and can then be used for population structure classification. Spawning    L.   polyactis    individuals were captured by stow nets in the same site of the southern Yellow Sea coastal waters during April–May in 2003, 2012, and 2013.  EPMA  (electron probe microanalysis) was used to determine the  Sr:Ca  ratios of a total of 25 otolith samples. Mann–Whitney  U -test was used to test the differences of otolith  Sr:Ca  ratios from the core to edge for each otolith. One-way ANOVA was performed to compare the mean otolith  Sr:Ca  values among 2003, 2012, and 2013. Otoliths from 2003, 2012, and 2013 showed similar patterns of  Sr:Ca  ratios and  Sr:Ca  ratios could be divided into higher and lower phases in the core and remaining regions, respectively. Inter-annual significant differences for each high or low  Sr:Ca  phase of otoliths were not observed over short- (between 2012 and 2013) or long-time (between 2003 and 2012, and between 2003 and 2013) scales. Univariate contrasts across the adjacent year and decade classes were statistically similar. The  Sr:Ca  ratio signatures in the otolith were relatively stable across years and can be used as a reliable natural tag for connectivity assessments and stock identification with little or no genetic differentiation among    L.   polyactis    populations. The short- and long-term temporal stability of otolith  Sr:Ca  ratios also revealed, the existence of stable    L.   polyactis    stocks in the southern Yellow Sea, consistent with a previous finding of capture survey.

acta ichthyologica et piscatoria

Temporal stability in the otolith Sr:Ca ratio of the yellow croaker,    Larimichthys   polyactis    (  Actinopterygii  ,   Perciformes  ,   Sciaenidae  ), from the southern Yellow Sea