Population genetics and evaluation of diallel cross of four red tilapia populations in Malaysia / Kayal Vizi a/p Karuppannan
Tilapia is an important farmed freshwater fish in Malaysia. Tilapia farming was introduced in Malaysia in the 1940’s. In 2003, tilapia accounted 21,417 tons of total freshwater aquaculture production. Red hybrid is the most popular tilapia species cultured in Malaysia. One of the constraints face...
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| Format: | Thesis |
| Published: |
2012
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| Online Access: | http://studentsrepo.um.edu.my/3816/1/1._Title_page%2C_abstract%2C_content_KAYAL_VIZI_KARUPPANNAN%2CSGR060053.pdf http://studentsrepo.um.edu.my/3816/2/2._Chapter_1_%E2%80%93_6.pdf http://studentsrepo.um.edu.my/3816/3/3._Appendices_%26_References.pdf http://pendeta.um.edu.my/client/default/search/results?qu=Population+genetics+and+evaluation+of+diallel+cross+of+four+red+tilapia+populations+in+Malaysia&te= http://studentsrepo.um.edu.my/3816/ |
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| Summary: | Tilapia is an important farmed freshwater fish in Malaysia. Tilapia farming was introduced
in Malaysia in the 1940’s. In 2003, tilapia accounted 21,417 tons of total freshwater
aquaculture production. Red hybrid is the most popular tilapia species cultured in Malaysia.
One of the constraints faced by the industry is quality of fries. There are quite a number of
private hatcheries in Malaysia producing tilapia fries and not much is known about their
quality with respect to their genetic variability. Thus this study attempted to characterize
the four study populations and one standard population, which were PKPS (PS), Bentong
(BT), Enggor (EG), Negeri Sembilan (NS) and Gift (GT) as control population using 20
polymorhic Microsatellite markers. Gift population is Nile tilapia. Their dendogram
relationship showed that the hetrozygosity value was high, which indicated the presence of
high genetic variability among the five populations. As a continuation, Diallel Crossing
was started among four populations, which were PKPS (PS), Bentong (BN), Enggor (EG)
and Negeri Sembilan (NS). Attention given to two traits, which were Growth and Survival.
In Growth Factor, trait studied was Specific Growth Rate. In Survival, Egg Hatchability,
Fry Survival and Adult Fish Survival were the three parameters focused on. As a outcome
of this study, managed to produce broodstocks with known genetic attributes through
quantitative genetics for fast growth rates based on high heritability, high additive variance
and low environmental effects. |
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