pdf download

More documents

Recommendations

Info

Stock retention was also high in the remaining raceways (MR 1, MR3, MR5, M1) over this period (05/02/02 – 07/05/02) (Table 4.3.9). The lowest stock retention rate of 83.8 per cent was in one of the new 12 m 3 TAMCO model raceways (M1) which was stocked with 43,632 fingerlings at 1.3 g each (M1). After 65 days 33,503 fish were harvested with an average weight of 7.2 g. The low rate of stock retention in this raceway was the result of 3,220 mortalities that were associated with a prophylactic treatment given to the stock during the latter part of the culture period. In the remaining three raceways (MR1, MR3, MR5), fish with average weights of 13.8, 30.7 and 253 g were stocked at rates of 984, 883 and 90 fish/m 3 respectively. The first of these raceways (MR1) was harvested after 76 days with fish averaging 31.3 g. The second raceway (MR3) was harvested at an after 91 days with 61.2 g average fish while the third raceway (MR5) was harvested after 76 days with 299 g fish. Rates of retention were equivalent to 99.1, 99.1 and 99.2 per cent respectively for these three raceways. The growth rates in these raceways were 0.4 (MR1), 1.1 (MR3) and 0.2 per cent per day (MR5). The FCR values for all raceways were above two for the period between 05/02/02 to 07/05/02. The highest FCR was recorded for the raceway with the largest fish (MR5). This raceway had an FCR of 1:8.6. For fish with an average size of 299.3 g this high FCR value indicates a high degree of overfeeding. This raceway had a comparatively low stocking density of 90 fish/m 3 . The other high FCR values of 1:6.0 and 1:4.2 were obtained in raceways stocked at 76 (MR4) and 165fish/m 3 (SR3) respectively. In comparison, FCRs in raceways stocked at densities of 168 fish/m 3 for 140.0 g fish (MR6) and 393 fish/m 3 for 68 g fish (MR2) were 1:2.3 and 1:2.1 respectively. This data suggests that overfeeding in raceways may be a combination of differing fish feeding behaviour associated with feed response and operator feeding practices. The growth of all size classes of fish in raceways was minimal over the winter of 2002. From the 19/07/02 until the 21/10/02 the average growth rate of fish was less than 0.24 ± 0.59 per cent per day (Table 4.3.10). The highest rate of growth was recorded in fish stocked at 19.9 g at a density of 17.8 kg/m 3 (SR2). A reduction in average weight was recorded for the raceway stocked with the largest fish at 41.4 kg/m 3 (MR5). The combined net weight gain for all raceways over this period was 794kg. On the 06/11/02 fish from all raceways were graded and stocked into similar size classes (Table 4.3.11). All but one of the 14m 3 prototype raceways (MR4) had been superseded with new TAMCO raceways. Approximately 35,410 fish averaging 4.6 g were stocked into a 12 m 3 raceway (S4) at a density of 2,950 fish/m 3 (13.5 kg/m 3 ). On the 18/02/02, after 104 days, these fish averaged 33.2 g and reached a final density of 86 kg/m 3 . This represents an average daily growth of 6.0 per cent per day. Good rates of growth were also observed for 12.1 and 30.2 g fish stocked in two 12 m 3 raceways at densities of 804 fish/m 3 (S5) and 1,068 fish/m 3 (S6). These fish reached 46.9 and 74.8 g respectively after 104 days growing at rates of 2.8 (S5) and 1.4 per cent per day (S6). The final densities in these raceways were high at 52 and 116 kg/m 3 . In all three cases (S4, S5 and S6) survival was high with 87.6, 95 and 99.3 per cent of the stock retained. Larger fish (IW average 62.4 and 131.2g) were also stocked at high densities (32.3 and 69.7 kg/m 3 ) in two 17.5 m 3 raceways (M1 and M2). The lower than expected stock retention of 78.9 per cent in M2 was the result of mortality experienced during a single prophylactic treatment on the 11/12/02. The high retention figures assisted in achieving relatively high final operating densities of 65.3 and 81.4 kg/m 3 . Fish with average weights approaching 244.7 and 296.7 g were stocked into two raceways (M3 and MR4) at 59.4 and 39.2 kg/m 3 (Table 4.3.11). Although some growth was recorded, these raceways were regularly graded to remove market sized fish and so any figures concerning average weight are not an accurate indication of final weights. The FCR for all raceways during the period from 06/11/02 to 18/02/02 ranged between 1:1.3 and 1:4.7 (Table 4.3.11). The lowest FCR values were obtained for 4.6 (S4), 12.1 (S5) and 30.2 g fish (S6) stocked at densities for their size class. The FCR’s for these raceways were 1:1.3, 1:2.1 and 1:1.6 respectively. Fish stocked with an average weight of 62.4 g (M1) returned an FCR of 1:2.1. The worst 32
FCR value of 1:4.7 was recorded in fish stocked at an average size of 121.1 g and harvested at 193 g after 98 days (M2). The low survival of 78.9 per cent may have contributed to the high FCR value in this raceway. Table 4.3.7 The length of culture period (Days), number per cubic meter (N/m 3 ), initial weight (IW), final weight (FW), initial stocking density (ISDkg/m 3 ), final stocking density (FSDkg/m 3 ), percent stock retention (%SR) daily percentage growth (G%/day) and food conversion ratio (FCR)for silver perch (Bidyanus bidyanus) from the 02/03/01 up to 27/09/01 in 7 and 14m 3 raceways R’way Start Finish Days N/m 3 IW FW ISD FSD %SR G%/day FCR (g) (g) (kg/m 3 ) (kg/m 3 ) SR1 02/08/01 27/09/01 56 3709 5.1 6.0 19.1 22.1 99.2 0.3 1:2.9 SR2 02/08/01 27/09/01 56 784 20.4 22.2 16.0 17.1 99.1 0.2 1:5.6 MR1 30/08/01 27/09/01 28 255 129.6 142.1 33.1 36.3 97.6 0.3 1:1.9 Table 4.3.8 The length of culture period (Days), number per cubic meter (N/m 3 ), initial weight (IW), final weight (FW), initial stocking density (ISDkg/m 3 ), final stocking density (FSDkg/m 3 ), percent stock retention (%SR), daily percentage growth (G%/day) and food conversion ratio (FCR) for silver perch (Bidyanus bidyanus) from the 02/03/01 up to 27/09/01 in 7 and 14m 3 raceways. Where FCR values are not provided their calculation had been invalidated by a lack of growth, reduction in biomass through stock loss or both R’way Start Finish Days N/m 3 IW FW ISD FSD %SR G%/day FCR (g) (g) (kg/m 3 ) (kg/m 3 ) SR1 07/11/01 29/01/02 83 1393 15.9 35.3 22.2 45.7 92.9 1.5 1:1.8 SR2 07/11/01 29/01/02 83 1453 5.9 25.3 8.7 36.7 100 3.9 1:1.5 SR3 07/11/01 29/01/02 83 977 10.4 22.5 10.2 22.0 100 1.4 1:4.1 MR1 07/11/01 29/01/02 83 358 69.7 98.5 25.0 35.3 100 0.5 1:6.9 MR2 07/11/01 29/01/02 83 1063 31.1 77.0 33.1 75.2 91.9 1.8 1:1.6 MR3 07/11/01 29/01/02 83 332 198.3 189.0 65.9 62.8 100 -0.1 - Table 4.3.9 The length of culture period (Days), number per cubic meter (N/m 3 ), initial weight (IW), final weight (FW), initial stocking density (ISDkg/m 3 ), final stocking density (FSDkg/m 3 ), percent stock retention (%SR), daily percentage growth (G%/day) and food conversion ratio (FCR) for silver perch (Bidyanus bidyanus) from the 05/02/02 up to 07/05/02 in 7 and 14m 3 raceways as well as a single 12m 3 raceway R’way Start Finish Days N/m 3 IW FW ISD FSD %S G%/day FCR (g) (g) (kg/m 3 ) (kg/m 3 ) R SR3 05/02/02 07/05/02 91 165 64.5 132.8 10.6 18.6 84.8 1.2 1:4.2 MR1 05/02/02 22/04/02 76 984 13.8 31.3 13.6 30.6 99.1 0.4 1:2.9 MR2 05/02/02 22/04/02 76 393 68.0 135.2 26.7 53.0 99.7 1.3 1:2.1 MR3 05/02/02 07/05/02 91 883 30.7 61.2 27.1 54.9 99.1 1.1 1:2.1 MR4 05/02/02 07/05/02 91 76 137.0 216.5 10.4 15.7 95.0 0.6 1:6.0 MR5 05/02/02 22/04/02 76 90 253.0 299.3 22.8 26.8 99.2 0.2 1:8.6 MR6 05/02/02 07/05/02 91 168 140.0 232.2 23.5 42.5 99.8 0.7 1:2.3 M1 03/03/02 07/05/02 65 3636 1.3 7.2 4.6 21.8 83.8 7.2 1:1.7 33
Page 1: Integrated Agri-Aquaculture Demonst
Page 4 and 5: © 2009 Rural Industries Research a
Page 6 and 7: Acknowledgments The authors would l
Page 8 and 9: Contents Foreword .................
Page 10 and 11: Table 4.3.11 Table 4.3.12 Table 4.3
Page 12 and 13: Executive Summary What the report i
Page 14 and 15: crop. This is much higher than simp
Page 16 and 17: documented such waters types as bei
Page 18 and 19: 2. Demonstration Farm 2.1 Backgroun
Page 20 and 21: Figure 2.2.3 Net cages used for sil
Page 22 and 23: 3. Water Use and Quality 3.1 Backgr
Page 24 and 25: inland Australia with high levels o
Page 26 and 27: Table 3.3.3 Average monthly afterno
Page 28 and 29: 169 165 161 157 153 149 145 141 137
Page 30 and 31: In February 2001, enough water was
Page 32 and 33: 4. Production Systems and Growth 4.
Page 34 and 35: Figure 4.2.3 The first 7m 3 floatin
Page 36 and 37: Figure 4.2.7 Uplift, baffle board a
Page 38 and 39: float to prevent drowning of air br
Page 40 and 41: Figure 4.2.13 Raceway push gate gra
Page 42 and 43: Table 4.3.1 Number and volume of ne
Page 44 and 45: Table 4.3.3 The length of culture p
Page 48 and 49: Table 4.3.10 The length of culture
Page 50 and 51: 4.3.5 Disease Detection and Treatme
Page 52 and 53: The average rate of growth for silv
Page 54 and 55: R E Figure 4.4.1 Existing (E) and r
Page 56 and 57: 5. Pesticide Monitoring and Residue
Page 58 and 59: 5.2.1.1 Pesticide Application and U
Page 60 and 61: prior to the commencement of the tr
Page 62 and 63: 5.4.2 Pesticide Bio-concentration a
Page 64 and 65: 0.4 0.35 0.3 0.25 ug/L 0.2 0.15 0.1
Page 66 and 67: There were no detections of endosul
Page 68 and 69: While further expansion of the inte
Page 70 and 71: 7. General Discussion The integrati
Page 72 and 73: Appendix Floating Raceway Technolog
Page 74 and 75: Why Raceways? McVeigh Brothers P/L
Page 76: Alternative but Adaptable System Mc
Page 79 and 80: Water Flow (eddy) Flow (cm/sec) 35
Page 81 and 82: End gates - changeable 67
Page 83 and 84: 35 g average fish - 3200 each 120 g
Page 85 and 86: Paul McVeigh Mark Fantin Doug Young
Page 87 and 88: Das, B., Sharif, Y., Khan, K., Das,
Page 89 and 90: Müller , J.F., S Duquesne, Jack. N
Page 91: Integrated Agri-Aquaculture Demonst

pdf download

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?