Use of otolith chemistry to discriminate juvenile Chinook salmon (Oncorhynchus tshawytscha) from different wild populations and hatcheries in Lake Huron

Publication year: 2011
Source: Journal of Great Lakes Research, Available online 25 September 2011</br>
Stephen A.C.*Marklevitz, Brian J.*Fryer, David*Gonder, Zhaoping*Yang, James*Johnson, ...</br>
Chinook salmon (Oncorhynchus tshawytscha) in Lake Huron consist of wild and hatchery-reared fish distributed among several populations. This study tested whether otolith chemistry can be used to identify the natal origin of Chinook salmon in this system. Concentrations of nine elements (Mg, K, Mn, Fe, Zn, Rb, Sr, Ba, and Pb) in the otoliths of Chinook salmon juveniles from 24 collection sites (17 streams and 7 hatcheries) around Lake Huron were analyzed using laser-ablation inductively-coupled mass spectrometry. Differences in otolith chemistry were found between rearing environments (wild and hatchery), among geological regions (Precambrian, Ordovician, Silurian, Devonian, and Carboniferous), and among collection sites. Discriminant function analysis showed high classification accuracies of juveniles to their rearing environment (wild versus hatchery, 82%), geological region (84%), and collection site (87%) of origin. With these values, there is excellent potential for otolith chemistry to be used to predict the natal origin of adults, and thus inform research and management of Chinook salmon in Lake Huron.</br>
Highlights

? We collected juvenile Chinook salmon from 17 Lake Huron streams and 7 hatcheries. ? Otolith chemistry (OC) was analyzed using LA-ICP-MS. ? OC differed between rearing environments, geological regions and collection sites. ? OC identified rearing environment, geological region, and collection site of origin. ? OC can be used as a research and management tool in Lake Huron.</br></br>

26th September 2011 21:20

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