将 Aurantiochytrium sp. Meal 作为低温条件下饲养的太平洋白对虾的饲料添加剂,WSSV 对其造成的挑战与热应激有关

Fishes Pub Date : 2024-03-18 DOI:10.3390/fishes9030108
Flávia Banderó Hoffling, Alex Silva Marquezi, I. Pinheiro, Cedric Simon, Artur Rombenso, W. Q. Seiffert, F. N. Vieira, D. D. Schleder
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摘要

一项研究测试了在清水系统和 22 °C的次优温度下饲养凡纳滨对虾时添加 Aurantiochytrium 藻粉的情况。测试剂量为 0(对照组)、1、2、3 和 4%,放养密度为 100 虾/立方米。饲养时使用通气装置和单独的加热器,海水温度由冷却器控制。九周后,对虾称重,收集血淋巴进行血液免疫测试,并计算生长性能。在 22 °C条件下养殖的对虾,饵料中添加1%的Aurantiochytrium sp.粉,其免疫指标更优。日粮检测后,每种处理共有 42 只虾(10.9 ± 0.06 克)感染了白斑综合症病毒(WSSV)。每克对虾口服 2.6 ± 106 个病毒颗粒,在 22 °C 的次优温度下维持 108 小时,然后在 28 °C 的最适温度下再适应 48 小时。累积死亡率结果表明,喂食含 3% 和 4% Aurantiochytrium sp.粉的饲料的对虾在感染 WSSV 后的存活率高于其他处理。
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Aurantiochytrium sp. Meal as Feed Additive for Pacific White Shrimp Reared under Low Temperature and Challenged by WSSV in Association with Thermal Stress
A study was conducted to test the inclusion of Aurantiochytrium sp. meal in the rearing of Penaeus vannamei grown in a clear water system and at a suboptimal temperature of 22 °C. The doses tested were 0 (control), 1, 2, 3, and 4% at a stocking density of 100 shrimp/m3. Rearing was carried out with aeration and individual heaters, and seawater temperature was controlled with a chiller. After nine weeks, shrimp were weighed and hemolymph was collected for hemato-immunological tests, and growth performance were calculated. Shrimp raised at 22 °C and fed a 1% of dietary supplementation of Aurantiochytrium sp. meal were superior in immunological parameters. After the dietary assay, a total of 42 shrimps (10.9 ± 0.06 g) per treatment were infected with White Spot Syndrome Virus (WSSV). They were orally infected with 2.6 ± 106 virus particles per g of the animal, maintained at a suboptimal temperature of 22 °C for 108 h, and acclimated to an optimal temperature of 28 °C for an additional 48 h. At 7 days post infection, surviving shrimp were collected for hemato-immunological analysis. Cumulative mortality results showed that shrimp fed diets containing 3% and 4% Aurantiochytrium sp. meal had higher survival than other treatments when challenged with WSSV.
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