Documenting utility of paddlefish otoliths for quantification of metals using inductively coupled plasma mass spectrometry

Rapid Communications in Mass Spectrometry
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Abstract

RATIONALE

The otoliths of the inner ear of fishes record the environment of their surrounding water throughout their life. For paddlefish (Polyodon spathula), otoliths have not been routinely used by scientists since their detriments were outlined in the early 1940s. We sought to determine if paddlefish otoliths were useful for resolving elemental information contained within.

METHODS

Adult paddlefish were collected from two wild, self-sustaining populations in Oklahoma reservoirs in the Arkansas River basin. Juveniles were obtained from a hatchery in the Red River basin of Oklahoma. Otoliths were removed and laser ablation, inductively coupled plasma mass spectrometry (ICP-MS) was used to quantify eight elements (Li, Mg, Mn, Rb, Sr, Y, Ba, and Pb) along the core and edge portions, which were analyzed for differences between otolith regions and among paddlefish sources.

RESULTS

Differences were found among samples for six of the eight elements examined. Otoliths from Red River basin paddlefish born in a hatchery had significantly lower amounts of Mg and Mn, but higher levels of Rb than otoliths from wild paddlefish in the Arkansas River basin. Concentrations of Y, Sr, and Ba were reduced on the edges of adult paddlefish from both reservoirs compared with the cores.

CONCLUSIONS

This research shows the utility of using an ICP-MS analysis of paddlefish otoliths. Future research that seeks to determine sources of paddlefish production, such as which reservoir tributaries are most important for reproduction or what proportion of the population is composed of wild versus hatchery-produced individuals, appears promising. Published in 2013. This article is a U.S. Government work and is in the public domain in the USA.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Documenting utility of paddlefish otoliths for quantification of metals using inductively coupled plasma mass spectrometry
Series title Rapid Communications in Mass Spectrometry
DOI 10.1002/rcm.6681
Volume 27
Issue 19
Year Published 2013
Language English
Publisher Wiley
Contributing office(s) Coop Res Unit Atlanta
Description 7 p.
First page 2188
Last page 2194
Online Only (Y/N) N
Additional Online Files (Y/N) N