Abstract
As the dominant and unique species in Lake Qinghai, the naked carp Gymnocypris przewalskii (Kessler) is characterized by upstream migration to spawn during late spring and summer in each year and back lake to live during the remaining seasons, but little is known about its migratory pattern. The migratory pattern of the naked carp is significant in understanding its living habitat and in protecting this precious fish. Otoliths are paired biogenic carbonates in the inner ear of teleost fish and grow layer by layer throughout the fish life. Owing to its metabolically inert without involvement in metabolic processes after deposition, chemical compositions of daily and annual growth increments in otoliths record the water elements of the ambient waters where the fish encountered during its life history. Therefore, microchemistry variation of otoliths has been used widely to trace migration pattern of fish and to reconstruct water chemistry and environmental conditions in the past.
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