Due to the decreasing
resources of both inshore and offshore fisheries, many organizations have released
fry to enhance their stock in recent years. The discrimination between wild and
hatchery-reared individuals must be performed to assess the efficiency of the
release. Fresh groundwater is generally used by hatchers in southwesternTaiwanto
decrease salinity and to promote the growth of larvae prior to feeding; thus,
the elemental composition of the otolith may be different in stocks, and this
difference may be used for identification. This study used Laser Ablation
Inductively Coupled Plasma Mass Spectrometry (LA-ICPMS) to analyze the trace
elements in the nuclei of otoliths from black porgy Acanthopagrus schlegelii, including six hatchery reared specimens
from the Tainan County, three recaptured marked and ten captured unmarked
specimens from the Miaoli County in Northwestern coast of Taiwan. Among the six
hatchery and three recaptured marked specimens, which ranged from 4.9 to23.4 cmin body length, the nucleus zone
(relative to within5 cmin
size growth) of the otoliths showed higher magnesium concentrations than that observed on both edges.
The distribution was similar to an inverse “V” shape. The otoliths also showed
lower manganese concentrations near the nucleus and had higher values near the
edges, resulting in a distribution similar to a “U” shape. According to the
appeared shape of Mg2+/Ca2+ and Mn2+/Ca2+ ratio in the central area of the nucleus zone, this study determined six
specimens which were from hatchery reared and three specimens were from wild among ten
unmarked specimens captured fromthe Northwestern coast of Taiwan. Under the
conditions used in this study, the absorption of calcium into the otolith was
active and required energy in the seawater
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