Genetic parameters estimation for growth traits in cultured tiger pufferfish (fugu), Takifugu rubripes
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Abstract: The aim of this study was to evaluate the genetic parameters of the growth performance of Takifugu rubripes. Heritabilities and genetic correlations were estimated for body weight (BW), body length (BL), total length (TL), chest measurement (CM) and trunk length (TKL) of T. rubripes from measurements of progeny at 6 months and 12 months. The results showed that the heritability was 0.37 for BW6, 0.19 for BL6, 0.35 for TL6, 0.29 for CM6, 0.26 for TKL6, 0.36 for BW12, 0.26 for BL12, 0.25 for TL12, 0.31 for CM12 and 0.15 for TKL12. The range of genetic correlations estimated at 6 months was 0.025–0.725 and −0.002–0.706 at 12 months. The results indicated that genetic improvement for faster growth rate or increased body weight in cultured T. rubripes was effective. Based on selection theory, the selection strategy for traits with medium heritability is flexible. Considering that these growth traits do not reach the high level of heritability, family selection should be expected. Given positive genetic correlations among BW, BL, TL, CM, and TKL at 6 months, the five traits could be improved simultaneously through selective breeding. As there was high genetic correlation only between BW12, BL12 and TL12, and negative correlations between TKL12 and BL12 as well as between CM12 and TL12, and only BW, BL and TL at 12 months could be improved simultaneously.
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Key words:
- family /
- genetic evaluation /
- heritability /
- genetic correlation
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Table 1. Descriptive statistics for all the variables included in the analysis
Trait Number of
Takifugu rubripesMean trait
valueStandard
deviationCoefficient of
variation/%Minimum
trait valueMaximum
trait valueBW6 2 400 167.474 g 32.220 g 19.238 93.500 g 216.700 g BL6 2 400 16.069 cm 1.144 cm 8.986 14.600 cm 19.200 cm TL6 2 400 19.925 cm 1.176 cm 5.902 17.000 cm 21.300 cm CM6 2 400 14.481 cm 1.408 cm 9.723 11.000 cm 16.200 cm TKL6 2 400 5.908 cm 0.772 cm 13.067 5.000 cm 7.000 cm BW12 2 011 353.379 g 62.369 g 17.649 176.000 g 513.700 g BL12 2 011 20.625 cm 1.235 cm 5.987 17.900 cm 24.300 cm TL12 2 011 23.957 cm 1.354 cm 5.651 19.600 cm 27.000 cm CM12 2 011 19.479 cm 1.554 cm 7.977 18.000 cm 22.600 cm TKL12 2 011 7.002 cm 0.783 cm 11.182 6.000 cm 8.800 cm Note: BW, body weight; BL, body length; TL, total length; CM, chest measurement; TKL, trunk length. Table 2. Variance components and heritability (h2) of five growth traits in Takifugu rubripes
Growth traits Variance components $ {{\sigma }}_{\mathrm{a}}^{2} $ ${\sigma }_{{\rm{f}}}^{2}$ ${\sigma }_{{\rm{e}}}^{2}$ h2 BW6 265.967 9 g 360.891 0 g 95.155 0 g 0.37±0.040 BL6 0.102 2 cm 0.265 6 cm 0.172 8 cm 0.19±0.023 TL6 0.580 6 cm 0.820 8 cm 0.274 0 cm 0.35±0.037 CM6 0.288 1 cm 0.487 0 cm 0.216 9 cm 0.29±0.032 TKL6 0.092 0 cm 0.170 5 cm 0.092 1 cm 0.26±0.026 BW12 345.567 4 g 524.396 0 g 96.666 0 g 0.36±0.041 BL12 0.413 9 cm 0.824 89 cm 0.341 9 cm 0.26±0.031 TL12 0.485 7 cm 0.959 3 cm 0.535 0 cm 0.25±0.025 CM12 0.519 0 cm 0.869 2 cm 0.311 0 cm 0.31±0.034 TKL12 0.093 1 cm 0.305 8 cm 0.242 8 cm 0.15±0.020 Note: BW6, 6-month body weight; BL6, 6-month body length; TL6, 6-month total length; CM6, 6-month chest measurement; TKL6, 6-month trunk length; BW12, 12-month body weight; BL12, 12-month body length; TL12, 12-month total length; CM12, 12-month chest measurement; TKL12, 12-month trunk length; ${\sigma }_{{\rm{a}}}^{2}$, additive genetic variance; ${\sigma }_{{\rm{f}}}^{2}$, full-sib variance; ${\sigma }_{{\rm{e}}}^{2}$, residual variance; h2, heritability. Table 3. Phenotypic (rp) (above the diagonal) and genetic (under the diagonal) correlations (rg) of growth traits in 6-month-old Takifugu rubripes
Trait BW6 BL6 TL6 CM6 TKL6 BW6 0.727** 0.727** 0.580** 0.155** BL6 0.725** 0.454** 0.461** 0.010 TL6 0.721** 0.445** 0.438** 0.105** CM6 0.578** 0.464** 0.420** 0.344** TKL6 0.146** 0.025 0.074** 0.357** Note: BW6, 6-month body weight; BL6, 6-month body length; TL6, 6-month total length; CM6, 6-month chest measurement; TKL6, 6-month trunk length. ** Correlation is significant at the 0.01 level (2-tailed). Table 4. Phenotypic (rp) (above the diagonal) and genetic (under the diagonal) correlations (rg) of growth traits in 12-month-old Takifugu rubripes
Trait BW12 BL12 TL12 CM12 TKL12 BW12 0.145** 0.482** 0.581** 0.697** BL12 0.146** 0.462** 0.075** 0.001 TL12 0.495** 0.466** 0.026 0.453** CM12 0.547** 0.072** −0.020 0.376** TKL12 0.706** −0.002 0.453** 0.373** Note: BW12, 12-month body weight; BL12, 12-month body length; TL12, 12-month total length; CM12, 12-month chest measurement; TKL12, 12-month trunk length. ** Correlation is significant at the 0.01 level (2-tailed). -
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