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

Michel, Christian; Schmidt-Posthaus, Heike; Burkhardt-Holm, Patricia (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. Ottawa: NRC Research Press 10.1139/cjfas-2012-0376

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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.

Item Type:

Journal Article (Original Article)

Division/Institute:

05 Veterinary Medicine > Department of Infectious Diseases and Pathobiology (DIP) > Center for Fish and Wildlife Health (FIWI)
05 Veterinary Medicine > Department of Infectious Diseases and Pathobiology (DIP) > Institute of Animal Pathology

UniBE Contributor:

Schmidt-Posthaus, Heike

Subjects:

500 Science
500 Science > 590 Animals (Zoology)

ISSN:

0706-652X

Publisher:

NRC Research Press

Language:

English

Submitter:

Heike Schmidt Posthaus

Date Deposited:

09 Dec 2013 15:38

Last Modified:

15 Jan 2014 04:12

Publisher DOI:

10.1139/cjfas-2012-0376

URI:

https://boris.unibe.ch/id/eprint/39218

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