Feed Worms (thanks to our office staff for the luchtime leftovers and tea bags) and Fish (Australian Bass/Silver Perch and Yabbies- old peas). Fine tuned flow on recirculation system. Left roller door open to encourage flow of fresh air.
Drained/Dumped Tanks 1,2 & 5 total 7,600l to remove fowled water. Rinsed and cleaned Tanks 1,2 & 5. To accomplish this turned off exit valves in Tanks 3-4 and open dump valve to outside to let Tanks 1, 2 & 5 to gravity drain... then Closed valves on Tanks 1,2 & 5 and reopened valves on Tanks 2-3. Restarted filtration system. Backwashed filter, topped up sump and added 100 gms of Bi-Carb Soda. Hosed out ARC using bleach and disinfectant. Topped up Tank 7 (Yabbies) and Aquarium 1 and 3. Left roller door partly open to encourage flow of fresh air.
System turned off and Australian Bass tanks (3-4) isolated. All dead Trout removed. Tanks 1-2 drained to dump, scrubbed and rinsed. System backwashed and rinsed. Tanks 1-2 isolated and tanks 3-4 brought back online. Several Bass were lost the rest responded to clean and fresh water.
All Trout were found dead. Water recirculation had stopped- reducing air diffusion and fresh water circulation. Over 120 Trout including 100 fingerlings (25cm) and 20 brood stock (35cm). This was a very sad week!
Thanks Frank for feeding fish. The water temp. Continues to reflect the higher than normal air temp. It has risen again from 21.9C to 22.5C since Thursday 5/10/06. This is critical to cold water fish such as Trout. We are trying to hangon until school resumes (Monday 16/10/06) to begin harvest. Recirculation system had stopped supply of water to Tank 1 and Tank 2... needed backwash. BIG backwash, rinse and clean (brushed Interior of Tanks), cleaned filter basket. Refilled sump 500l and added 100g of Bi-Carb Soda to balance/buffer new tank water. Topped up Tank 7 (Yabbies) and Aquarium 1/3. Dumped Oyster shells from trailer (needed trailer). Turned off Ultraviolet sterilised- unsure if it contributes to water temp? Fish oiled locks. Removed rubbish to school industrial bin. Moved 'hot house' and gardening gear to ARC.
Jobs NEEDED to be done. Close monitoring of water quality- pH, Temp Further backwash Water Chrysanthemums
Further Trout deaths, 1 * Tank 1 and 1 * Tank 2 change harvest plans! The hot weather has forced us to rethink our planned harvest. Nundle trout appear to be LESS tolerant to temperature increases. We have always been dictated to by the magic 24C. Arc-En-Ciel suggested that the Tasmanian Trout have a lower threshold to temperatures above 20C and it is now being proved. See- http://www.bom.gov.au/products/IDN60801/IDN60801.95770.shtml