Submitted by: Nefertiti Smith Christman University of California, Irvine nnsmith@uci.edu
Abstract:
Human activities wreak havoc on aquatic environments. For instance, when sediment is removed or relocated during rain or irrigation events, the local aquatic habitats are disrupted due to increased suspended sediment entering waterways. More particulates in the water means reduced visual acuity, behavioral avoidance of newly turbid waters, potential damage to gill tissue, and an altered microbiome for fishes in these waterways. Thus, increased suspended sediment caused by human activity is a significant stressor for fishes, at least on a superficial level. We exposed zebrafish (<em>Danio rerio</em>) to a low dose (45 mg/L) of suspended sediment for four weeks. The sediment-exposed fish were lighter in color than fish raised without sediment, but we detected no differences in terminal fish size, amylase activity in the gut, or whole body corticosterone concentrations from sediment exposure. Sediment-exposed fish had significantly shorter guts, suggesting reduced intake when the fish had sediment in their surrounding water. Thus, levels of suspended sediment thought to be sub-lethal, but stressful, didn’t appear to detrimentally impact <em>D. rerio</em>.
Primary Session Choice: CS016 Environmental Change
Authors:
Nefertiti Smith Christman, University of California, Irvine (nnsmith@uci.edu)
Donovan German, University of California, Irvine (dgerman@uci.edu)
Left in the dust: suspended sediment impacts fish physiology
Category
Scientific Sessions > CS016 Environmental Change
Description
Preference: Oral