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Zak, T.Deshev, R.Benet-Perlberg, A.Naor, A.Magen, I.Shapira, Y.Ponzoni, R.W.Hulata, G.[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

The effect of selection for greater growth rate in the GIFT strain on traits related to female reproduction (weight at spawning, number of eggs, number of fry, total weight of fry and number of dead fry) was studied. Available records comprised 10 generations of data from a total of 935 breeding ...


Hamzah, A.Nguyen Hong NguyenMekkawy, W.Hooi Ling KhawHoong Yip YeeAbu Bakar, K.R.Ponzoni, R.W.Mohd Nor, S.A.[Genetic parameters and correlated responses in female reproductive traits in the GIFT strain]Genetic parameters and correlated responses in female reproductive traits in the GIFT strain

The present study examined the variation in survival, proportion of male morphotypes, female and male proportion, female reproductive status and tag losses in nine crosses from a complete (3 × 3) diallel mating of three populations of Macrobrachium rosenbergii in India. The populations originated...


Pillai, B.R.Mahapatra, K.D.Ponzoni, R.W.Sahoo, L.Lalrinsanga, P.L.Mekkawy, W.Khaw, H.L.Nguyen, N.H.Mohanty, S.Sahu, S.Patra, G.[Survival, male morphotypes, female and male proportion, female reproductive status and tag loss in crosses among three populations of freshwater prawn Macrobrachium rosenbergii (de Man) in India]Survival, male morphotypes, female and male proportion, female reproductive status and tag loss in crosses among three populations of freshwater prawn Macrobrachium rosenbergii (de Man) in India

Many tilapia (Oreochromis spp.) farmers produce all-male populations because of the superior growth rate of males compared to females. To investigate differences in body weight at harvest of males and females among different tilapia strains, we analyzed data from 62,787 individuals collected from...


Lind, C.E.Safari, A.Agyakwah, S.K.Attipoe, F.Y.K.El-Naggar, G.O.Hamzah, A.Hulata, G.Ibrahim, N.A.Khaw, H.L.Nguyen, N.H.Maluwa, A.O.Zaid, M.Zak, T.Ponzoni, R.W.[Differences in sexual size dimorphism among farmed tilapia species and strains undergoing genetic improvement for body weight]Differences in sexual size dimorphism among farmed tilapia species and strains undergoing genetic improvement for body weight

The aims of this study were the estimation of genetic parameters for survival rate from tagging until harvest and the evaluation of the correlated response in survival rate to selection for harvest weight in the genetically improved farmed tilapia (GIFT) strain. The heritability for survival rate...


Hamzah, A.Mekkawy, W.Hooi Ling KhawNguyen Hong NguyenHoong Yip YeeAbu Bakar, K.R.Nor, S.A.M.Ponzoni, R.W.[Genetic parameters for survival during the grow-out period in the GIFT strain of Nile tilapia (Oreochromis niloticus) and correlated response to selection for harvest weight]Genetic parameters for survival during the grow-out period in the GIFT strain of Nile tilapia (Oreochromis niloticus) and correlated response to selection for harvest weight

Competition for resources is common in aquaculture, which inflates the variability of fish body weight. Selective breeding is one of the effective approaches that may enable a reduction of size variability (or increase in uniformity) for body weight by genetic means. The genetic variance of unifo...


Hooi Ling KhawPonzoni, R.W.Hoong Yip YeeAziz, M.A.Mulder, H.A.Marjanovic, J.Bijma, P.[Genetic variance for uniformity of harvest weight in Nile tilapia (Oreochromis niloticus)]Genetic variance for uniformity of harvest weight in Nile tilapia (Oreochromis niloticus)

Flesh characteristics comprising chemical composition (protein, fat and moisture percentages and pH) as well as a sensory attribute (colour) were measured in 1951 fillet samples from two generations of two populations (a selection line, selected for increased harvest weight, and a control line, s...


Hamzah, A.Nguyen Hong NguyenMekkawy, W.Ponzoni, R.W.Hooi Ling KhawHoong Yip YeeAbu Bakar, K.R.Mohd Nor, S.A.[Flesh characteristics: Estimation of genetic parameters and correlated responses to selection for growth rate in the GIFT strain]Flesh characteristics: Estimation of genetic parameters and correlated responses to selection for growth rate in the GIFT strain

Background Social interactions often occur among living organisms, including aquatic animals. There is empirical evidence showing that social interactions may genetically affect phenotypes of individuals and their group mates. In this context, the heritable effect of an individual on the phenoty...


Hooi Ling KhawPonzoni, R.W.Bijma, P.[Indirect genetic effects and inbreeding: Consequences of BLUP selection for socially affected traits on rate of inbreeding]Indirect genetic effects and inbreeding: Consequences of BLUP selection for socially affected traits on rate of inbreeding

The Abbassa selection line (developed by selective breeding) and the Kafr El Sheikh commercial strain (widely used in Egypt), both Oreochromis niloticus, were compared at two stocking densities (two and four fish m−2). Harvest weight, length, depth, width and head length were recorded. The Abbass...


Ibrahim, A.N.Abou Zaid, M.Y.Hooi Ling KhawEl-Naggar, G.O.Ponzoni, R.W.[Relative performance of two Nile tilapia (Oreochromis niloticus Linnaeus) strains in Egypt: The Abbassa selection line and the Kafr El Sheikh commercial strain]Relative performance of two Nile tilapia (Oreochromis niloticus Linnaeus) strains in Egypt: The Abbassa selection line and the Kafr El Sheikh commercial strain

Africa harbours a rich biological diversity of native fish resources. Recognition of the potential to use these resources to make significant contributions towards improving African food security through aquaculture has existed for some time. A key challenge, however, is achieving compatibility b...


Lind, C.E.Brummett, R.E.Ponzoni, R.W.[Exploitation and conservation of fish genetic resources in Africa: Issues and priorities for aquaculture development and research]Exploitation and conservation of fish genetic resources in Africa: Issues and priorities for aquaculture development and research

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