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首页基因标记F1虹鳟鱼在RAS中的生长性能评估
基因标记F1虹鳟鱼在RAS中的生长性能评估
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更新于2024-09-02
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本研究关注的是虹鳟鱼(Oncorhynchus mykiss)在循环水产养殖系统(RAS)中的生长性能评估,特别是在基因层面上具有特定遗传特征的F1代虹鳟。研究选取了具有Omy207UoG基因座的个体,这个基因座表现出高度多态性(核型数NA为13,遗传加权信息含量PIC为0.891,遗传多样度HE为0.9003)。这些虹鳟被放入六个5立方米的鱼缸中,初始平均体重为37.8克,平均体长14.6厘米,整个养殖周期为317天。 在实验期间,研究人员密切关注了生长性能指标,如总重量、长度增长率以及长度-重量关系。结果显示,经过遗传选择的F1虹鳟鱼在整个养殖过程中显示出均匀的增长趋势,平均总重量达到了552.2克,这表明它们在RAS环境中有较高的生长潜力。长度-重量关系表明了等轴测增长模式(>3.0),这意味着虹鳟鱼在各个方向上的生长速率相当,显示出良好的体型发育平衡。 此外,水质管理也是研究的重要组成部分,因为良好的水环境对养殖动物的健康和生长至关重要。然而,具体的水质参数和管理措施并未在摘要中详细列出,但可以推测,为了维持适宜的养殖条件,可能涉及水质监测、过滤、营养补充以及疾病预防等方面的工作。 这项研究的成果对于亚热带地区虹鳟鱼养殖业的发展具有重要意义,因为它提供了一个长期的标记辅助选择(MAS)框架,通过遗传特性来优化养殖性能,从而提高产量和经济效益。MAS是一种利用分子标记技术进行育种改良的方法,有助于提高养殖品种的遗传纯度和优良性状的传递,对于可持续水产养殖业的发展具有长远的战略价值。
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J. L. Arredondo-Figueroa et al.
718
nm) light and photo documented in a Multi Genius SyngeneMR apparatus, us-
ing the Gene Snap (ver 6.02.05) software.
To amplified locus Omy207UoG in F1 we used primers 5’-ACC CTA GTC
ATT CAG TCA GG-3’ and 5’-GAT CAC TGT GAT AGA CAT CG-3 from O'-
Connell (1997), with the following amplification conditions: 94˚C –2 min (one
cycle), and 35 cycles at 94˚C –15 sec, 54˚C –15 sec 72˚C –30 sec.
Capillar electrophoresis was carried out in the automated sequencer system
ABI Prism 3100 Avant at Laboratorio Divisional de Biología Molecular de la Di-
visión de Ciencias Biológicas de la Universidad Autónoma Metropolitana Un-
idad Iztapalapa.
The allelic sizes resolved were determined with the Data Collection V 2.0
software and in relation to the size standard LIZ-500 in GeneMapper V 3.5.
2.2. Genetic Characterization and Diversity of the F1
Genetic variability was assessed by determining the following parameters at the
intra-specific level: 1) number of alleles observed (
NA
) and effective number of
alleles (
EffeA
) were determined in Geno Dive 2.0b23 [21]; 2) polymorphic in-
formation content (
PIC
), allele frequencies and c) allele direct count (AC) ob-
served and expected heterozygosity (
H
O
and
H
E
) were determined in Cervus
3.0.3 [22]. To test Hardy-Weinberg equilibrium (H-W) we used Fisher exact test
as implemented in GENEPOP version 4.0.10 [23] and the
F
IS
estimates for each
allele were computed following [24].
P-values
for overall
F
IS
estimate were calcu-
lated by the Markov chain method using the following parameter: dememoriza-
tion 10,000, 1000 batches and 10,000 iterations per batch.
2.3. Experimental Design for Growth Performance of F1
A total of 942 F1 genetically selected juveniles of rainbow trout were introduced
in a RAS at Planta Experimental de Producción Acuícola (PExPA), located at 2
240 meters above sea level (masl) in Mexico City (CDMX), in six 5 m
3
circular
fish tanks connected to recirculating aquaculture system. In each fish tank 157
juveniles were introduced with an initial average total weight (TW) of 37.8 ±
12.05 g and an average total length (TL) of 14.6 ± 1.53 cm. The experiment has a
duration of 317 days.
2.4. Feeding
The rainbow trout were fed with commercial Steelhead food (45% of protein and
16% of lipids; Silver Cup, Toluca, Mexico) with different pellets sizes according
to the average TW and TL of fishes and were partitioned in two daily rations
(10:00 and 16:00 h). The initial food rate was of 2.5% of the total biomass, de-
creasing according to the TW to 2%, 1.5% and finally 1%.
2.5. Length-Weight Relationship
The length-weight relationship was calculated by the formula TW = aTL
b
, where:
TW = total weight; TL = total length; a = is the intercept and b = the slope; the b
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