WWW.WAS.ORG • WORLD AQUACULTURE • JUNE 2017 33 TABLE 1. Production results for Pacific white shrimp cultured in 0.1-ha earthen ponds over a 16-week culture period using feeding strategies that include a standard feeding protocol (SFP), SFP with a 15% increase in feed inputs, automatic feeder with a timer, as well as an automatic feeder with acoustic feedback (AQ1)1. Treatment Yield (kg/ha) Final wt. (g) Survival (%) Feed conversion ratio SFP 3069a 23.6a 75.8 0.94 SFP + 15% 3033a 24.7a 72.2 1.04 Timer2 3294a 28.7b 66.9 0.98 AQ1 4569b 35.9c 73.9 1.14 P-Value 0.0016 <0.0001 0.3112 0.0598 Pooled standard error 227 1.2 3.0 0.05 1 Mean values (n=4) in the same column with different superscripts are significantly different (P < 0.05) based on analysis of variance followed by Student Newman-Keuls multiple range test. 2 n=3 due to low DO and high mortality in one pond. TABLE 2. Partial cost and value of shrimp cultured over a 16-week production period in ponds and maintained using four different feeding strategies. These included a standard feeding protocol (SFP), SFP with a 15% increase in feed inputs, automatic feeder with a timer, as well as an automatic feeder with acoustic feedback (AQ1)1. Treatment Total feed input Feed cost Feed cost Shrimp value Partial income (kg/ha) ($/ha) ($/kg shrimp) ($/ha) ($/ha) SFP 2586a 2841a 0.94 11,810a 9068a SFP + 15% 3129a 3102a 1.03 11,776a 8773a Timer2 3188a 3159a 0.97 13,446a 10,386a AQ1 5407b 5289b 1.09 21,198b 16,007b P-Value <0.0001 <0.0001 0.1983 <0.0001 0.0004 Pooled standard error 170 163 0.05 837 769 1 Mean values (n=4) in the same column with different superscripts are significantly different (P < 0.05) based on analysis of variance followed by Student Newman-Keuls multiple range test. 2 n=3 due to low DO and high mortality in one pond. TABLE 3. Yearly (feed) costs, fixed (equipment) costs, and income for each treatment as analyzed for four ponds (all in US$/ha). SFP SFP + 15% Timer AQ1 Shrimp sales 11,810 11,776 13,446 21,198 Feed (2,840) (3,102) (3,158) (5,289) Equipment* - - (589) (5,630) Income less costs 8,969 8,674 9,698 10,278 Income over SFP (non amortized) (295) 728 1,309 Income over SFP (costs amortized over 5 years) (295) 1,199 5,813 * Equipment costs only includes equipment that was not also needed for the SFP. The SFP treatment did not require any equipment that was not needed by the other treatments.
RkJQdWJsaXNoZXIy MjExNDY=