Browsing Sustainable aquaculture by Author "Rezk, M.A."
Now showing items 1-18 of 18
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Comparative growth of Egyptian tilapias in response to declining water temperature
(2002)Type: Journal ArticleThe current study was conducted to evaluate performance of Egyptian tilapia species and populations under a decreasing temperature regime to identify the components of growth. -
Effect of varying density and water level on the spawning response of African catfish Clarias gariepinus: Implications for seed production
(2006)Type: Journal ArticleThe development of a reliable methodology for spawning of African catfish, Clarias gariepinus without the use of hormone injections would greatly improve the prospects of aquaculture in Africa. Earlier work has shown that ... -
Effects of rearing conditions on low temperature tolerance of Nile tilapia, Oreochromis niloticus, juveniles
(2004)Type: Conference ProceedingsThis paper summarizes the results of two experiments in which the effects of genotype, age, size, condition factor and diet (natural phytoplankton versus formulated protein pellets) on low-temperature tolerance of juvenile ... -
Effects of relatedness and inbreeding on reproductive success of Nile tilapia (Oreochromis niloticus)
(2009)Type: Journal ArticleIt is well established that progeny of inbred matings are less fit than those of outbred matings, and that inbred individuals suffer from reduced viability and fertility. Inbreeding can be avoided by dispersal of progeny ... -
Evaluation of different vaccination strategies for control of (MAS) in Nile tilapia (O. niloticus) in Egypt
(2008)Type: Conference PaperThe Motile Aeromonas Septicemia (MAS), caused by Aeromonas hydrophila is among the dangerous diseases encountered in freshwater fish culture. This work aims to compare and evaluate difference vaccination strategies for ... -
Factors affecting early growth of Nile tilapia fry in hapa-in-pond environments
(2005)Type: ReportHapas, usually suspended in fertilized ponds, have long been used for tilapia fry production (Santiago et al., 1985; Bhujel, 1997) and recently for fry rearing. In fish breeding programs, members of a full-sib family usually ... -
Genetic analysis of Nile tilapia (Oreochromis niloticus) selection line reared in two input environments
(2009)Type: Journal ArticleAscertaining the appropriate selection environment for Nile tilapia (Oreochromis niloticus) in Africa is a critical issue. Two data sets derived from two selection lines originating from a common base population were ... -
Genetic and environmental factors affecting growth of Nile tilapia (Oreochromis niloticus) juveniles: Modelling spatial correlations between hapas
(2006)Type: Journal ArticleThe aim of this study was to quantify the environmental and genetic effects on early growth of Nile tilapia, Oreochromis niloticus. -
Heritability estimates and response to selection for growth of Nile tilapia (Oreochromis niloticus) in low-input earthen ponds
(2006)Type: Journal ArticleThis study presents results of two generations of selection (G1 and G2) for growth of Nile tilapia. The selection environment consisted of earthen ponds which were fertilized daily with 50 kg dry matter (dm)/ha chicken ... -
Heritability of cold tolerance in Nile tilapia, Oreochromis niloticus juveniles
(2005)Type: Journal ArticleThe inability of tilapia to tolerate low temperatures is of major economic concern as it reduces their growing season and leads to over winter mortality. In this study, cold tolerance of juvenile Nile tilapia, Oreochromis ... -
Mating systems and male reproductive success in Nile tilapia (Oreochromis niloticus): a microsatelite analysis
(2006)Type: Journal ArticleFry production in Nile tilapia, Oreochromis niloticus is typically achieved by mass spawning of males and females stocked in large hapas suspended in ponds. In such spawning aggregations, territorial behavior and reproductive ... -
Phenotypic and genetic parameters for body measurements, reproductive traits and gut length of Nile tilapia (Oreochromis niloticus) selected for growth in low-input earthen ponds
(2007)Type: Journal ArticleIn this study we present estimates of phenotypic and genetic parameters for body size measurements, reproductive traits, and gut length for Nile tilapia (Oreochromis niloticus) selected for growth in fertilized earthen ... -
Prevalence of Aeromonas hydrophila infection in wild and cultured tilapia nilotica (O. niloticus) in Egypt
(2008)Type: Conference PaperThis paper aims to study the seasonal prevalence of <i>Aeromonas hydrophila</i> in naturally collected and cultured <i>O. niloticus</i>.Results showed that prevalence of the infection was higher in cultured fish during the ... -
Production of genetically improved organic Nile tilapia
(2008)Type: Journal ArticleDemand for organic products for human consumption has been on the increase due to the belief that organic products are safer and healthier to the consumer and the environment. In developing countries, Nile tilapia (Oreochromis ... -
Response to three generations of selection for increased body weight in channel catfish, Ictalurus punctatus, grown in earthen ponds
(2003)Type: Journal ArticleSelection response for body weight at marketable size was measured for channel catfish, Ictalurus punctatus, grown in earthen ponds at 7500 fish/ha. Three generations of mass selection for increased body weight in Kansas ... -
Selecting Nile tilapia (Oreochromis niloticus) for growth in low-input environments
(2007)Type: Book ChapterThis chapter presents the results from a selective breeding experiment with Nile tilapia in a low input pond environment. The environment was defined as low input as the pond only received chicken manure for fertilisation. ... -
Selective breeding for increased body weight in a synthetic breed of Egytian Nile tilapia, Oreochromis niloticus: response to selection and genetic parameters
(2009)Type: Journal ArticleSelection for harvest weight was performed in a fully pedigreed synthetic line of Nile tilapia (Oreochromis niloticus) in Egypt for two generations. Records were available over three spawning seasons (2002, 2003 and 2004) ... -
Size dependent cannibalism in juvenile Nile tilapia (Oreochromis niloticus)
(2004)Type: Conference ProceedingsCannibalism among tilapia fry and fingerlings has been identified as one of the major problems by small-scale hatchery operators (Pantastico et at., 1988). Despite the increasing interest in this species, cannibalism among ...
