Tuttle James T, Smith Matthew A, Roy Luke A, Jones Michele, Lochmann Rebecca, Kelly Anita M
School of Fisheries, Aquaculture & Aquatic Sciences, Alabama Fish Farming Center, 529 South Centreville Street, Greensboro, AL 36744, USA.
Department of Aquaculture and Fisheries, University of Arkansas at Pine Bluff, 1200 North University Drive, Pine Bluff, AR 71601, USA.
Animals (Basel). 2022 Oct 17;12(20):2797. doi: 10.3390/ani12202797.
As the northern Largemouth bass (LMB) () industry shifts toward fingerling production, implementing practical feeding strategies to ensure efficient growth during high water temperatures is paramount. Twenty (12.7 ± 0.2 g) (Trial 1) and fifteen (7.2 ± 0.1 g) (Trial 2) LMB fingerlings were stocked in two recirculating systems (each containing nine tanks), acclimated to 30 °C, with one system fed daily rations of 3, 5 and 7% body weight (Trial 1), and the second system fed to satiation daily, every second day, or every third day (Trial 2), for 28 days each. All treatments were triplicated. Multiple growth metrics and lipid composition were analyzed. The 3% treatment yielded the lowest final average weight (36.05 g) and FCR (0.83), with no difference in final biomass in Trial 1 treatments. Fish fed to satiation daily and every second day produced FCRs and biomasses of 0.83 and 356.78 g, and 0.93 and 272.26 g, respectively. There were no differences in total lipid concentration, however, fatty acid profiles differed significantly between all treatments within their respective trials. Feeding LMB fingerlings 3% of total body weight or feeding daily to satiation allows for efficient growth at 30 °C and implements cost-effective feeding strategies.
随着北方大口黑鲈（LMB）养殖产业向鱼种生产转变，实施切实可行的投喂策略以确保在高温水温下实现高效生长至关重要。在两个循环系统（每个系统包含九个水箱）中分别投放了20尾（12.7±0.2克）（试验1）和15尾（7.2±0.1克）（试验2）大口黑鲈鱼种，使其适应30°C的水温，其中一个系统每天投喂体重3%、5%和7%的日粮（试验1），另一个系统每天、每隔一天或每隔三天投喂至饱食（试验2），每个试验持续28天。所有处理均设置三个重复。分析了多个生长指标和脂质组成。3%日粮处理组的最终平均体重（36.05克）和饲料转化率（FCR）最低（0.83），试验1各处理组的最终生物量无差异。每天和每隔一天投喂至饱食的鱼的饲料转化率和生物量分别为0.83和356.78克，以及0.93和272.26克。总脂质浓度无差异，然而，在各自试验的所有处理组之间，脂肪酸谱存在显著差异。以鱼体重的3%投喂大口黑鲈鱼种或每天投喂至饱食可在30°C下实现高效生长，并实施具有成本效益的投喂策略。
