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Breeding for Resilient Growth in Til...

Aththar, Muhammad Hunaina Fariduddin,

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Breeding for Resilient Growth in Tilapia /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Breeding for Resilient Growth in Tilapia // Muhammad Hunaina Fariduddin Aththar.
Author:	Aththar, Muhammad Hunaina Fariduddin,
Description:	1 electronic resource (165 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 86-07, Section: B.
Contained By:	Dissertations Abstracts International86-07B.
Subject:	Physiology. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31827558
ISBN:	9798302390691

Breeding for Resilient Growth in Tilapia /
Aththar, Muhammad Hunaina Fariduddin,

Breeding for Resilient Growth in Tilapia /Muhammad Hunaina Fariduddin Aththar. - 1 electronic resource (165 pages)

Source: Dissertations Abstracts International, Volume: 86-07, Section: B.

The dynamic environments and wide diversity of aquaculture production systems along with an increase from less to more intensive production systems can introduce various biotic and abiotic stressors. It is important for farmers to have fish that show more consistency in growth despite environmental stressors. Longitudinal weight records can be used to measure growth consistency which is an indicator for the ability of fish to recover to baseline levels following stressors. The aim of this thesis is to improve methods for measuring resilient growth using the variance of deviations from the expected growth performance (LnVar)and to provide knowledge for improving resilient growth in tilapia through selective breeding. First, I addressed the development of a novel measure for LnVar using individual growth curves as the expected performance (LnVarind)and used this to estimate the genetic correlation between LnVarand growth in freshwater ponds with or without daily diurnal dissolved oxygen fluctuations. LnVarindwas found to be highly heritable in the more challenging environment and this can be exploited by selective breeding. The genetic correlation of LnVarindbetween the ponds was 0.50, suggesting that genetic improvement in the good environment will not automatically lead to improved LnVarindin the challenging environment. Second, I defined the economic value of LnVarbased on the effect of fluctuation in fish growth on feed waste, growth deficiency and feed saving. This shows that reducing LnVarwill improve economic returns. Incorporating LnVarinto the selection index alongside HWincreased the economic response by 11%. Third, I addressed the genotype by environment interaction for growth of Sukamandi tilapia between freshwater and brackish water ponds. Brackish water resulted in higher growth performance and there was substantial GxE interaction for growth between brackish water and freshwater. Fourth, I estimated genetic parameters of growth consistency measured with LnVar,in brackish water monoculture and in co-culture with shrimps. Sukamandi tilapia is able to thrive in co-culture with shrimps, achieving growth rates comparable to monoculture. We found heritable variation in LnVarfor tilapia grown in the brackish water ponds. We found moderate GxE between co-culture and monoculture. The magnitude of GxE for LnVarbetween co-culture and monoculture is higher than that for the growth parameters, suggesting that LnVaris more responsive to the environmental differences than growth. The genetic correlation between LnVarand the growth of Sukamandi tilapia is less than unity, which supports the idea that LnVarand growth are different traits. Finally, I present a broader discussion on the concept of growth consistency as an indicator for resilience and its application in fish breeding programs.

English

ISBN: 9798302390691Subjects--Topical Terms:

518431
Physiology.

Breeding for Resilient Growth in Tilapia /
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