Salinity/ionic balance interactions on the zootechnical performance and histology of Litopenaeus vannamei and water quality in a biofloc system

IF 2.3 3区 农林科学 Q2 FISHERIES
Mitsuaki Ueno Fukura, Luis Felipe Collazos Lasso, Luis Alejandro Vinatea Arana, Bernardo Baldisserotto
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Abstract

This study aimed to evaluate the interactions between two low salinities (S = 4 and 8 g L−1) and two ionic balances (Na+/Mg+2/Ca+2/K+ ratio, IB1 = 27.6/3.6/1.05/1 and IB2 = 40.6/4.7/1.98/1) on zootechnical performance and histology of Litopenaeus vannamei postlarvae (0.0073 ± 0.0007 g) and juveniles (0.2163 ± 0.0080 g) reared in a biofloc system at stocking density of 1500 and 300 individuals m−3, respectively, over two culture phases: nursery (30 days) and grow-out (60 days). High nitrification processes were detected at lower salinity treatments, with the lowest ammonia and nitrite concentration in those. There were no significant differences on shrimp survival between treatments; however, the best final weights were observed in the S8IB2 (0.24 ± 0.01 g) and S4IB1 (2.80 ± 0.12 g) treatments for the nursery and grow-out stages, respectively. The most frequent histological lesions were the absence of lipid vacuoles in the hepatopancreas and abundant organic debris in the gill lamellae. The viability of rearing L. vannamei juveniles in biofloc at low salinity is still relatively weak because of their low growth and low efficiency to store fatty acids in the hepatopancreas; however, higher postlarvae productivity was found at 8 g L−1 and Na+/Mg+2/Ca+2/K+ ratio of 40.6/4.7/1.98/1 in the nursery stage.

Abstract Image

盐度/离子平衡对万年青的动物学性能和组织学以及生物絮团系统中的水质的相互作用
本研究旨在评估两种低盐度(S = 4 和 8 g L-1)和两种离子平衡(Na+/Mg+2/Ca+2/K+比率,IB1 = 27.6/3.6/1.05/1 和 IB2 = 40.6/4.7/1.98/1)对万年青幼体(0.0073±0.0007克)和幼鱼(0.2163±0.0080克)在生物絮团系统中饲养,饲养密度分别为1500和300只/m-3,分为两个养殖阶段:育苗(30天)和生长期(60天)。在盐度较低的处理中,氨氮和亚硝酸盐浓度最低,硝化过程较高。不同处理之间的对虾存活率没有明显差异;但在育苗和生长阶段,S8IB2(0.24 ± 0.01 克)和 S4IB1(2.80 ± 0.12 克)处理的最终重量最好。最常见的组织学病变是肝胰腺中没有脂质空泡,鳃片中有大量有机碎屑。在低盐度条件下,在生物絮凝物中饲养凡纳滨对虾幼体的生存能力仍然相对较弱,因为其生长速度慢,肝胰腺中储存脂肪酸的效率低;然而,在育苗阶段,当 Na+/Mg+2/Ca+2/K+ 比率为 40.6/4.7/1.98/1 时,8 g L-1 和 Na+/Mg+2/Ca+2/K+ 比率为 8 g L-1 时,幼体的生产率较高。
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来源期刊
CiteScore
5.90
自引率
7.10%
发文量
69
审稿时长
2 months
期刊介绍: The Journal of the World Aquaculture Society is an international scientific journal publishing original research on the culture of aquatic plants and animals including: Nutrition; Disease; Genetics and breeding; Physiology; Environmental quality; Culture systems engineering; Husbandry practices; Economics and marketing.
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