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236 Aquaculture

**Heritabilty estimate (h2) ± E.S. Age (month)** LC LS

Table 4. Estimates of heritability (h2) ± E.S in F1 at the different ages (months), in selection

with a value of 1.1 reducing the third month (0.27) have to rise again in the fourth month (0.58). Due to the differential survival and in order to reduce the effect of common environment which is reported in previous studies with crustaceans (Benzie et al., 1997; Hetzel et al., 2000; Pérez-Rostro & Ibarra, 2003), the density of families in the third month

Estimates of heritability (combined males and females) in F1 at the end of the trial was similar for both lines (0.27 ± 0.11 and 0.34 ± 0.12, LC and LS, respectively), coinciding with results obtained by Pérez-Rostro & Ibarra (2003) in white shrimp *Litopenaeus vannamei*, where values of 0.20 were obtained at 17 weeks of culture as well and those of Cameron et al. (2004) in the red claw crayfish *C. quadricarinatus*, where a decrease in the value of

When growth gain between the lines was compared, it was seen that LS was significantly

Fig. 20. Weight gain between selection line (LS) and control line (LC) during the five months

line (LS) and control line (LC)

of culture.

were standardized, leaving 11 organisms per family in F1.

heritability of 0.38 for the first year to 0.13 after 4 years.

heavier (9.6%) than the control line (Figure 20).

1 0.48 ± 0.11 1.10 ± 0.14 2 0.08 ± 0.04 0.61 ± 0.12 3 0.23 ± 0.07 0.27 ± 0.08 4 0.20 ± 0.10 0.58 ± 0.14 5 0.27 ± 0.11 0.34 ± 0.12


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