Home > Tags > Genetics

Genetics

The establishment of a national breeding program for genetically improved Nile tilapia and the development of models for private and public sector partnerships for seed multiplication and distribution

Egypt faces a growing population and shrinking supplies of water. The Ministry of Agriculture recognizes that increasing crop and livestock production per unit of water and land is an essential priority. Fish has been identified as one of the two most important livestock sub-sectors for future national food security. However, to meet the growing demand for fish in the face of static returns from capture fisheries, new supplies will have to come from aquaculture and increasing the productivity of already existing fish farms.
 

Genomics in marine monitoring: New opportunities for assessing marine health status

This viewpoint paper explores the potential of genomics technology to provide accurate, rapid, and cost efficient observations of the marine environment.

Quantitative genetic parameter estimates for body and carcass traits in a cultured stock of giant freshwater prawn selected for harvest weight in Vietnam

Benefits derived from selective breeding have been demonstrated in livestock and in some fish species, but by contrast, there have been few systematic selection programs reported for shrimps. Improving growth rate has been identified as the most important trait in the breeding objective for cultured shrimp species.

Inbreeding and effective population size in a coho salmon (Oncorhynchus kisutch) breeding nucleus in Chile

A commercial breeding nucleus of coho salmon (Oncorhynchus kisutch) was established in Chile in 1997. This nucleus consists of two independent populations corresponding to different year-classes (even and odd, depending on the spawning year), which have been successfully selected for harvest weight (approximate genetic gain per generation of 10%).

Strain comparisons in aquaculture species: a manual

When different strains or breeds of a particular species are available, the best choice is seldom immediately obvious for producers. Scientists are also interested in the relative performance of different strains because it provides a basis for recommendations to producers and it often stimulates the conduct of work aimed at unraveling the underlying biological mechanisms involved in the expression of such differences.

Considerations about dissemination of improved fish strains

Aquaculture production systems in developing countries are largely based on the use of unimproved species and strains. As knowledge and experience are accumulated in relation to the management, feeding and animal health issues of such production systems, the availability of genetically more productive stock becomes imperative in order to more effectively use resources.

Genetic improvement of Israeli blue (Jordan) tilapia, Oreochromis aureus (Steindachner), through selective breeding for harvest weight

Genetic improvement of Israeli blue (Jordan) tilapia, Oreochromis aureus (Steindachner), through selective breeding for harvest weight
Zak, T. ; Deshev, R. ; Benet-Perlberg, A. ; Naor, A. ; Magen, I. ; Shapira, Y. ; Ponzoni, R.W. ; Hulata, G. Aquaculture Research 9 Nov 2012

Genetic parameters and selection responses were obtained for harvest body weight of blue tilapia (Oreochromis aureus) from data collected over three generations in a selected population. A total of 18 194 records representing 186 sires and 201 dams were used in the analysis. Within generation heritability estimates for harvest body weight ranged from 0.18 to 0.58. When data from more than one generation were included in the analysis, heritability estimates became more stable (0.33–0.40) and it was 0.33 when all data were included in the analysis. The common full-sib effect accounted for 10% of the phenotypic variance in the full data set. Heritability for survival from stocking to harvest was estimated at 0.01 and 0.09 in actual units (fitting an animal model) and in the logit (sire model) scale respectively. The genetic correlation between harvest body weight and survival was 0.22 and not significantly different from zero. The total selection response for harvest body weight over the three generations of selection measured as the difference between least-squares means of selected and control lines was 17.7%. The corresponding figure when response was measured as the difference between mean breeding values of selected and control lines was 19.6%. The average inbreeding coefficient was 0.003 after three generations of selection. These results indicate that there are good prospects for the genetic improvement of harvest body weight in blue tilapia.

Breeding improved prawns in India

India has enormous freshwater and low saline brackish water resources that can be utilized for freshwater prawn farming. Since the mid-1990s, production of the giant river prawn (Macrobrachium rosenbergii) has boomed, making India the second largest freshwater prawn producer in the world. Over recent years, prawn production has been declining, threatening the ongoing success of the prawn industry, and the livelihoods of the communities it supports. The Genetic Improvement of Freshwater Prawn project aims to safeguard the future of the prawn industry in India through the establishment of a selective breeding program for high quality prawn stock.
 

Pages

Subscribe to Genetics