Current state and future potential

El‐Sayed, Abdel‐Fattah M.

doi:10.1016/b978-0-12-816509-6.00001-x

Cited by 8 publications

(14 citation statements)

References 2 publications

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“…Tilapia (family Cichlidae), which is a recommended food item by the United Nations' Food and Agriculture Organization, is the second most cultured fish worldwide [1], accounting for 60% of total production in Israel [2]. Tilapia have gained popularity in aquaculture due to their fast growth, tolerance to a wide range of environmental conditions, resistance to stress and ability to reproduce effectively in captivity [1]. Tilapia hybridization has been practiced in Israel since the early 1960s.…”

Section: Introductionmentioning

confidence: 99%

Infection by the parasite Myxobolus bejeranoi (Cnidaria: Myxozoa) suppresses the immune system of hybrid tilapia

Maor-Landaw

Smirnov²,

Brekhman

et al. 2022

Preprint

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Background: Tilapia is the second most cultured fish worldwide and in Israel, it constitutes 60% of total production. Recently, the myxozoan parasite Myxobolus bejeranoi was found to infect the gills of hybrid tilapia (Nile tilapia (Oreochromis niloticus) X Jordan/Blue tilapia (O. aureus)), causing high morbidity and mortality. Myxozoa (Cnidaria) is a large group of microscopic obligate endoparasites that can cause emerging diseases, affecting wild fish populations and fisheries. Here, we aimed to elucidate the cellular processes occurring in the fish host following infection by M. bejeranoi. Methods: Comparative transcriptomics was performed on fish that had been exposed to infectious fish pond water containing M. bejeranoi actinospores for 24 hours. We compared the effects of minor, intermediate, and severe infection levels on the sporulation site, namely the gills, as well as on the hematopoietic organs head kidney and spleen. Enrichment analyses for Gene Ontology and KEGG pathways were performed and gene network was generated based on Jaccard distance matrix and visualized with Cytoscape. Results: Enrichment analysis indicated immune system activation in the gills at severe infection stage. However, in the head kidney a broad immune suppression was observed, including deactivation of secreted cytokines that play important roles in immune response of fish and of a transcription factor responsible for T helper cell differentiation. Moreover, the cytotoxic effector proteins perforin and granzyme B were down-regulated in the spleen. Finally, significant up-regulation of insulin in the spleen may imply that it functions as an immunomodulatory hormone inducing systemic immune suppression. Conclusions: Our analysis illustrates the incapacity of the hybrid tilapia host to eliminate its pathogenic invader, the myxozoan M. bejeranoi. We hypothesize that the signal for immune suppression originates at the sporulation site and traverses to the hematopoietic organs. These findings suggest that M. bejeranoi is a highly efficient parasite that disables the defense mechanisms of its fish host.

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Section: Introductionmentioning

confidence: 99%

Infection by the parasite Myxobolus bejeranoi (Cnidaria: Myxozoa) suppresses the immune system of hybrid tilapia

Maor-Landaw

Smirnov²,

Brekhman

et al. 2022

Preprint

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“…In commercial tilapia culture systems, both monoculture of Nile tilapia ( O. niloticus ) and polyculture of tilapia with North African catfish ( C. gariepinus ) and common carp ( C. carpio ) are commonly practiced, especially in sub‐Saharan Africa (SSA) 43 . The use of mixed‐sex tilapia is common, although sex‐reversed (all male) tilapia culture is spreading in a number of SSA countries 6 . This system is primarily based on fertilization using a compost crib built inside the pond, where farmed tilapia depends on the enhanced natural food production.…”

Section: Tilapia Farming Systems In Africamentioning

confidence: 99%

“…The more advanced farming systems, namely SI and intensive farming technologies are also practiced, especially in Egypt, Uganda, Ghana and Kenya. SI tilapia farming in earthen ponds is popular; where tilapia monoculture and polyculture systems are commonly used 6,39 …”

Section: Tilapia Farming Systems In Africamentioning

confidence: 99%

“… 1,3 Nile tilapia are highly adapted to tropical, subtropical and temperate environments. They are characterized by their fast growth rates, tolerance to extreme environmental conditions (such as temperature, salinity, pH, and low dissolved oxygen), high resistance to stress and diseases, trophic plasticity and feeding on low trophic levels, and their ability to reproduce in captivity 6,8,9 . These attributes made them an ideal candidate for aquaculture all over the globe.…”

Section: Introductionmentioning

confidence: 99%

“…This means that there is still confusion among researchers in the taxonomic classification of tilapia. 5 Eleven tilapia species are currently farmed in Africa, 6 compared to only three species in 1980. However, Nile tilapia (Oreochromis niloticus) (Linnaeus, 1758) is, by far, the most widely cultured tilapia species, 7 due to its economic value as one of the most important farmed fish species in the world.…”

Section: Introductionmentioning

confidence: 99%

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From Africa to the world—The journey of Nile tilapia

El‐Sayed

Fitzsimmons

2023

Reviews in Aquaculture

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Despite the fact that Nile tilapia (Oreochromis niloticus) (Linnaeus, 1758) are African freshwater fish, they have been introduced into many countries inside and outside Africa. The journey of Nile tilapia started during the second half of the 20th Century, especially in Southeast Asia and the Americas, mainly for aquaculture and fisheries enhancement. Most of these introductions became well established in aquaculture. As a result, aquaculture of Nile tilapia has been steadily expanding in many countries. These fish play an important role in the livelihoods of local societies on different continents. This review summarizes the current knowledge on global Nile tilapia introductions and sheds light on their social and economic contributions to the countries into which they have been introduced, as well as their share in the global fish market. The ecological impacts of tilapia introductions have also been addressed. The success stories of the major Nile tilapia producers were highlighted so that the lessons learned from their experiences could be transferred to other countries.

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Modulatory effects of dietary prickly pear (Opuntia ficus-indica) peel on high salinity tolerance, growth rate, immunity and antioxidant capacity of Nile tilapia (Oreochromis niloticus)

Salem,

Almisherfi,

El-Sayed

et al. 2024

Fish Physiol Biochem

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This study evaluated the effects of prickly pear (Opuntia ficus-indica) peel (PPP) on salinity tolerance, growth, feed utilization, digestive enzymes, antioxidant capacity, and immunity of Nile tilapia (Oreochromis niloticus). PPP was incorporated into four iso-nitrogenous (280 g kg−1 protein) and iso-energetic (18.62 MJ kg−1) diets at 0 (PPP0), 1 (PPP1), 2 (PPP2), and 4 (PPP4) g kg−1. Fish (9.69 ± 0.2 g) (mean ± SD) were fed the diets for 75 days. Following the feeding experiment, fish were exposed to a salinity challenge (25‰) for 24 h. Fish survival was not affected by the dietary PPP inclusion either before or after the salinity challenge. Fish fed the PPP-supplemented diets showed lower aspartate aminotransferase, alanine aminotransferase, cortisol, and glucose levels compared to PPP0, with the lowest values being observed in PPP1. Fish fed dietary PPP had higher growth rates and feed utilization than PPP0. Quadratic regression analysis revealed that the best weight gain was obtained at 2.13 g PPP kg−1 diet. The highest activities of protease and lipase enzymes were recorded in PPP1, while the best value of amylase was recorded in PPP2, and all PPP values were higher than PPP0. Similarly, PPP1 showed higher activities of lysozyme, alternative complement, phagocytic cells, respiratory burst, superoxide dismutase, glutathione peroxidase and catalase, and lower activity of malondialdehyde than in PPP0. Further increases in PPP levels above 2 g kg−1 diet led to significant retardation in the immune and antioxidant parameters. Thus, the inclusion of PPP at about 1 to or 2 g kg−1 diet can improve stress tolerance, immunity, and antioxidant capacity in Nile tilapia.

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Current state and future potential

Cited by 8 publications

References 2 publications

Infection by the parasite Myxobolus bejeranoi (Cnidaria: Myxozoa) suppresses the immune system of hybrid tilapia

Infection by the parasite Myxobolus bejeranoi (Cnidaria: Myxozoa) suppresses the immune system of hybrid tilapia

From Africa to the world—The journey of Nile tilapia

Modulatory effects of dietary prickly pear (Opuntia ficus-indica) peel on high salinity tolerance, growth rate, immunity and antioxidant capacity of Nile tilapia (Oreochromis niloticus)

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