Suspended sediment pulse effects in rainbow trout (Oncorhynchus mykiss) - relating apical and systemic responses

Michel, C. and Schmidt-Posthaus, H. and Burkhardt-Holm, P.. (2013) Suspended sediment pulse effects in rainbow trout (Oncorhynchus mykiss) - relating apical and systemic responses. Canadian Journal of Fisheries and Aquatic Sciences, 70 (4). pp. 630-641.

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To provide an integrated perspective on mineral particle effects in salmonids, juvenile rainbow trout (Oncorhynchus mykiss) were exposed to daily mica particle pulses for 8 and 24 days. On day 8, increased immature erythrocyte proportions indicated a previous stress response. This response was absent on day 24, on which condition factor as well as plasma protein and aspartate aminotransferase activity decreased. The latter two related negatively to the hepato-somatic index, suggesting metabolic adaptations. The hepato-somatic index increased on days 8 and 24, while spleen-somatic index increased on day 24. No histopathological damage occurred in gills, liver, spleen, or kidney. However, splenic melano-macrophages increased on both days, and hyaline degenerations of kidney tubular cells were apparent on day 24. Overall, particle pulses affected rainbow trout more via turbidity rather than by physical damage. We conclude that (i) rainbow trout may adapt to sediment pulses as early as 8 days of exposure and (ii) particle pulses over 24 days can cause structural and metabolic changes in rainbow trout, even when gill damage is absent and apical effects on condition are moderate.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Integrative Biologie > Aquatische ├ľkologie (Holm)
UniBasel Contributors:Holm, Patricia and Michel, Christian
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:NRC Research Press
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:03 Oct 2017 06:30
Deposited On:24 May 2013 09:18

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