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Fish Biological Response Data

This is the fish biological response data.

Fish group 1: 01/09/04 12:34 through 01/23/04 10:04
Fish group 2 01/23/04 13:47 through 02/06/04 09:53
Fish group 3: 02/06/04 13:48 through 02/20/04 12:50
Fish group 4: 02/20/04 16:26 through 03/05/04 10:31
Fish group 5: 03/05/04 13:26 through 03/19/04 10:01
Fish group 6: 03/19/04 14:20 through 04/02/04 10:38

No fish mortality occurred during monitoring period. Six alarm events occurred.

Click on the graphs below to enlarge.

Hydrological data
Fish Response Data

Event 1 (1/18/04 21:04 - 21:19 and 1/18/04 to 21:49 - 23:19) Alarm event was caused by a significant increase in water temperature and decrease in dissolved oxygen. The temperature rose from 12oC to 20.9oC and dissolved oxygen decreased from 8.8 mg/L to 1.4 mg/L in 4.5 hours due to a main pump malfunction. This resulted in an increased ventilatory rate and ventilatory depth.

Event 2 (1/27/04 1:17 through 1/27/04 03:02): Alarm event occurred due to a pump malfunction, similar to Event #1.

Event 3 (2/1/04 1:38 through 2/1/04 3:23): An alarm event similar to Events #1 and #2 occurred due to a pump malfunction, which was repaired.

Event 4 (Multiple alarms from 2/18/04 17:50 through 2/20/04 13:05) There were 10 separate alarms totaling 9.5 hours. The only ventilatory parameter responding was average depth. The conductivity during the acclimation / baseline period was around 5.00 mS/cm, whereas the average conductivity during the alarms was 0.98 mS /cm. There was an increase in average depth in response to the decrease in conductivity, reflecting an inversely proportional relationship.

Event 5 (2/27/04 9:56 through 2/27/04 10:11) An alarm event occurred for 15 minutes. There was a +2.5 oC change in temperature and -1.35 mg/L change dissolved oxygen in a 15 minute period. All four ventilatory parameters increased during this 15 minute period, then recovered in the next period. This alarm was due to scheduled maintenance to the system.

Event 6 (Multiple alarms from 3/7/04 22:56 through 3/7/04 23:41) A 45 minute alarm event was caused by a sharp decrease in dissolved oxygen. The dissolved oxygen level dropped by 1.02 mg/L in 15 minutes, along with a gradual temperature increase. The alarm was primarily caused by increased ventilatory rate and ventilatory depth and is consistent with the response patterns of events 1 through 3.

Event 7 (Multiple alarms 3/9/04 9:26 through 3/19/04 09:31) Alarm events were caused primarily by decreased average ventilatory depth. The average depth during baseline was around 12 V, and the conductivity was around 2 mS/cm. At the time of the alarms, the average depth was ~5 V and the conductivity was around 5 mS /cm. The average depths of all fish were significantly lower than the baseline period average depths, resulting in a sustained "fish out of control" situation for the remainder of the monitoring period for fish group 5.

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