Visual, spectral, and microchemical quantification of crystalline anomalies in otoliths of wild and cultured delta smelt.

Autor: Lewis LS; University of California, Davis, USA. lewis.sci@gmail.com., Huang JL; University of California, Davis, USA., Willmes M; University of California, Santa Cruz, USA., Fichman RA; University of California, Davis, USA., Hung TC; University of California, Davis, USA., Ellison LT; University of California, Davis, USA., Stevenson TA; University of California, Davis, USA., Teh SJ; University of California, Davis, USA., Hammock BG; University of California, Davis, USA., Schultz AA; United States Fish and Wildlife Service, Vernal, UT, USA., Grimsich JL; University of California, Berkeley, USA., Huyskens MH; University of California, Davis, USA., Yin QZ; University of California, Davis, USA., Cavole LM; University of California, Davis, USA., Botto NW; University of California, Davis, USA., Hobbs JA; University of California, Davis, USA.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2022 Dec 01; Vol. 12 (1), pp. 20751. Date of Electronic Publication: 2022 Dec 01.
DOI: 10.1038/s41598-022-22813-w
Abstrakt: Developmental abnormalities in otoliths can impact growth and survival in teleost fishes. Here, we quantified the frequency and severity of developmental anomalies in otoliths of delta smelt (Hypomesus transpacificus), a critically endangered estuarine fish that is endemic to the San Francisco Estuary. Left-right asymmetry and anomalous crystalline polymorphs (i.e., vaterite) were quantified and compared between wild and cultured populations using digital image analysis. Visual estimates of vaterite were validated using X-ray diffraction, Raman spectroscopy, laser ablation ICPMS, and electron probe microanalysis. Results indicated that cultured delta smelt were 80 times more likely to contain a vateritic otolith and 18 times more likely to contain relatively large (≥ 15%) amounts of vaterite. Similarly, cultured fish exhibited 30% greater asymmetry than wild fish. These results indicate that cultured delta smelt exhibit a significantly higher frequency of vestibular abnormalities which are known to reduce fitness and survival. Such hatchery effects on otolith development could have important implications for captive culture practices and the supplementation of wild fish populations with cultured individuals.
(© 2022. The Author(s).)
Databáze: MEDLINE
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