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Improved breeding of Nile Tilapia leads to productivity gains

WorldFish, Malaysia (30 November 2012)
 
Two improved strains of Nile Tilapia that grow 30% faster and heavier than non-improved strains are helping to increase aquaculture productivity and food security in West Africa and Egypt.
 

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.

Partnership Story – Fast-growing fish to reduce poverty in Ghana

In Ghana, the Volta River basin reaches across over half of Ghana’s countryside. Lake Volta, the world’s largest (by surface) man-made lake, is the centerpiece of both the Volta River and the Ghanaian economy, as it provides a source of hydroelectric power as well as vast populations of fish for the locals. With demand for fish booming to support a growing population, meeting supply is often a challenge. Since 1999, the Water Research Institute (WRI) in Ghana has been working with WorldFish to make the Volta basin as productive as it can be through a Nile Tilapia breeding program.
 

WorldFish Annual Report 2011/2012 - Including financial statement for 2011

 
This year's report contains the Director General's and Chairman's statements. Also highlighted in the reports, are stories of projects with different partners:
 

Fast-growing Fish Can Contribute to Poverty Reduction in the Volta Basin

As urban populations continue to expand rapidly in Africa, the continent’s demand for fish grows accordingly. Unfortunately, existing stocks of fish cannot keep pace with this growth. Fish accounts for over 30% of total animal protein consumption in the diets of Africa’s poor. In some countries, it is even higher. In Ghana, that value is about 60%. Although Ghana and many other African countries import fish at a loss in an attempt to meet some of the demand for low-cost protein, they still face shortfalls. This dire situation provides African fish farmers with an opportunity to increase fish production, thereby improving food security and reducing poverty.
 

Selecting the best tilapia strain to maximize productivity

The Philippines derives substantial benefits from its aquatic and fisheries resources. The contribution to the country’s total fish production from aquaculture has consistently increased, outpacing growth in both the small-scale and commercial fishery sectors.
 

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