Abstract:
:The present study evaluated, in an 18-month gilthead sea bream trial, the time course effects of genetics on individual size variation and growth compensation processes in families selected by heritable growth in the PROGENSA® breeding program. Families categorized as fast, intermediate, and slow growing had different growth trajectories with a more continuous growth in fast growth families. This feature was coincident with a reduced size variation at the beginning of the trial that clustered together the half-sib families sharing the same father. Regression analysis evidenced that the magnitude of compensatory growth was proportional to the initial size variation with no rescaling of families at this stage. By contrast, the finishing growth depensation process can mask, at least partially, the previous size convergence. This reflects the different contribution across the production cycle of genetics in growth. How early-life experiences affect growth compensation at juvenile stages was also evaluated in a separate cohort, and intriguingly, a first mild-hypoxia pulse at 60-81 days post-hatching (dph) increased survival rates by 10%, preventing growth impairment when fish were exposed to a second hypoxia episode (112-127 dph). The early hypoxia experience did not have a negative impact on growth compensatory processes at juvenile stages. By contrast, a diminished capacity for growth compensation was found with repeated or late hypoxia experiences. All this reinforces the use of size variation as a main criterion for improving intensive fish farming and selective breeding.
journal_name
Fish Physiol Biochemjournal_title
Fish physiology and biochemistryauthors
Perera E,Rosell-Moll E,Naya-Català F,Simó-Mirabet P,Calduch-Giner J,Pérez-Sánchez Jdoi
10.1007/s10695-020-00899-1subject
Has Abstractpub_date
2020-11-13 00:00:00eissn
0920-1742issn
1573-5168pii
10.1007/s10695-020-00899-1pub_type
杂志文章abstract::In the present study, heat shock cognate 70 (HSC70) and inducible heat shock protein 70 (HSP70) gene of humphead snapper, Lutjanus sanguineus, were cloned by rapid amplification of cDNA ends (RACE) technique with the primers designed from the known expressed sequence tags (ESTs) identified from the subtracted cDNA lib...
journal_title:Fish physiology and biochemistry
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