NDLI: When low genetic variability in feral and hatchery-reared tilapia becomes a vicious circle: Oreochromis niloticus from Oaxaca, Mexico

Content Provider	Springer Nature Link
Author	Soto Hernández, J. Velasco Murillo, A. Grijalva Chon, J. M.
Copyright Year	2008
Abstract	Several tilapia species in Mexican reservoirs have been used as food source for more than 40 years but little effort has been devoted to the conservation and genetic selection of those species. Our objective was to evaluate genetic variability in feral (n = 59) and hatchery-produced (n = 58) Oreochromis niloticus stocked in the Benito Juarez dam. Allozyme analyses for 13 enzymatic systems and general proteins yielded 27 genetic loci. Seventeen loci were polymorphic in at least one sample. The observed heterozygosity was lower than expected and the imbalance in the Hardy–Weinberg equilibrium in almost all loci was caused by heterozygote deficiency. The inbreeding coefficient was 84%. Although the evidence suggests moderate genetic differentiation, it is probable that a great proportion of the source of hatchery organisms is from feral organisms. According to our results, management of the hatchery strain is inadequate, therefore other breeding strategies are needed to increase the genetic variability of O. niloticus from Oaxaca.
Starting Page	469
Ending Page	478
Page Count	10
File Format	PDF
ISSN	09676120
Journal	Aquaculture International
Volume Number	17
Issue Number	5
e-ISSN	1573143X
Language	English
Publisher	Springer Netherlands
Publisher Date	2008-09-25
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Tilapia Oreochromis niloticus Allozymes Genetic variability Oaxaca Zoology Freshwater & Marine Ecology
Content Type	Text
Resource Type	Article
Subject	Aquatic Science Agronomy and Crop Science

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