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Effects of stocking density on survival, growth and stress resistance of juvenile tambaqui ( Colossoma macropomum ) reared in a recirculating aquaculture system (RAS)
Aquaculture International ( IF 2.9 ) Pub Date : 2021-01-21 , DOI: 10.1007/s10499-021-00647-z
Walisson de Souza e Silva , Andre Lima Ferreira , Luanna do Carmo Neves , Nathália Soares Ferreira , Glauber David Almeida Palheta , Rodrigo Takata , Ronald Kennedy Luz

The effects of different stocking densities (StDs) on growth and stress resistance rate (Rs) to air exposure (to evaluate the health condition of fish) of juvenile Colossoma macropomum in a recirculating aquaculture system (RAS) were investigated. A total of 1064 juveniles (0.35 ± 0.10 g) were stocked in 0.5 (D0.5), 1 (D1), 3 (D3), and 5 animals/L (D5) in four different RASs of four circular tanks (28 L) each, and fed at 10% biomass/day. Growth and survival were assessed at 15, 30, 45 and 60 days. After 60 days, a 75-min air exposure test was conducted for each StD treatment and Rs determined. Regression analyses were performed for growth parameters. At 15 days, weight (W), weight gain (WG), daily weight gain (DWG), feed intake (FI), feed conversion rate (FCR), and specific growth rate (SGR) were highest for D3. At 30 days, FI was highest at the StD values estimated through the derivation of the equation of 3.55 animals/L. At 45 days, WG, DWG, and SGR decreased with increasing StD. At 60 days, W was inversely proportional to StD. Biomass was directly related to StD at the end of all periods. Air exposure stress test found that after 48 h, 72 h, and 96 h, Rs values for D3 and D5 were highest and for D0.5 lowest. Stocking densities of between 3 and 4 animals/L are recommended for the first 30 days, while higher StDs affected weight between 30 and 60 days. Animals at StDs between 3 and 5 animals/L are more resistant.



中文翻译:

放养密度对循环水产养殖系统(RAS)中养殖的丹巴qui(Colossoma macropomum)存活,生长和抗逆性的影响

对生长和胁迫抗性率(Rs)至空气暴露不同放养密度(STDS)的效果(以评价鱼的健康状况)的少年淡水白macropomum在再循环养殖系统(RAS)进行了调查。总共以0.5(D 0.5),1(D 1),3(D 3)和5动物/ L(D 5)放养了1064只幼鱼(0.35±0.10 g))分别放入四个圆形储罐(28 L)的四个不同的RAS中,并以10%的生物量/天进料。在第15、30、45和60天评估生长和存活率。60天后,对每种性病治疗进行75分钟的空气暴露测试,并确定Rs。对生长参数进行回归分析。在15天时,D 3的体重(W),体重增加(WG),日增重(DWG),采食量(FI),饲料转化率(FCR)和比生长率(SGR)最高。在30天时,FI最高,其标准差可通过推导3.55动物/ L的方程式估算得出。在第45天,WG,DWG和SGR随着StD的增加而降低。60天时,W与标准差成反比。在所有时期结束时,生物量都与性病直接相关。暴露于空气中的压力测试发现,在48、72和96小时后,D 3D 5的Rs值最高,而D 0.5的Rs值最低。建议头30天的饲养密度为3至4只动物/升,而较高的性传播疾病会影响30至60天的体重。StDs在3至5动物/升之间的动物更具抵抗力。

更新日期:2021-01-21
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