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Recovery of Barotrauma Injuries in Chinook Salmon, Oncorhynchus tshawytscha from Exposure to Pile Driving Sound

Figure 4

Injury index values for Chinook salmon.

The injury index values for Exposure 1 and 2 to which Chinook salmon were exposed. There was a significant decrease in RWI scores from day 2 to day 5 in Exposure 1 fish (solid blue diamonds), suggesting that this is when healing is beginning to occur. There were no differences between days 5 and 10, implying that after initial healing of more serious injuries occurs, it then may take longer for minor injuries such as hematomas to heal. There was no significant difference between days 0 through 10 for fish in Exposure 2 (solid red triangles) and each day was not significantly different than controls (open blue diamond for Exposure 1 and open red triangle for Exposure 2).

Figure 4