Diseases of Nile Tilapia with Special Emphasis on Water Pollution

Ibrahim, Taghreed B.

doi:10.3923/jest.2020.29.56

Cited by 22 publications

(21 citation statements)

References 58 publications

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“…Recently, Egypt's Nile tilapia (Oreochromis niloticus) industry encountered huge economic losses due to infectious disease outbreaks (Ali et al 2020;Abdelsalam et al 2021;Eissa et al 2021;Elgendy et al 2022b). Fish reared in farms with polluted water sources are more vulnerable to numerous infections, including fungal diseases (Zahran et al 2017;Ibrahim 2020). Cadmium is among the toxic pollutants released into the aquatic systems and seriously threatens aquatic animal health (Bayomy et al 2015;Elgendy et al 2015a,b).…”

Section: Introductionmentioning

confidence: 99%

Onion (Allium cepa) improves Nile tilapia (Oreochromis niloticus) resistance to saprolegniasis (Saprolegnia parasitica) and reduces immunosuppressive effects of cadmium

et al. 2022

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The present study investigated the protective effects of dietary Allium cepa against Saprolegnia parasitica infections and the amelioration of cadmium-induced immunosuppression in Oreochromis niloticus. Saprolegnia isolates were recovered during an outbreak of saprolegniasis in farmed O. niloticus raised in a poor aquatic environment. Isolates were identified phenotypically as S. parasitica. Results were confirmed further by ITS gene sequencing. Four fish groups were kept in water with cadmium (1.5 mg/L) and fed for 30 days on a diet supplemented with crude or alcoholic extracts of A. cepa using two concentrations (0.5% or 1%). Positive (with Cd) and negative (without Cd) control fish groups were given the basal diet. The 96 h LC50 value of Cd in tilapia was (15.1 mg/L Cd). Fish exposed to Cd showed poor growth performance parameters, abnormal biochemical measurements, impaired immunological responses, and high oxidative stress indicators. Feeding tilapia on A. cepa-supplemented diets enhanced their growth performance (WG, SGR) and improved the nonspecific immune responses (WBCs, total protein, globulins, lysozyme, myeloperoxidase, and antiproteases). The inclusion of A. cepa in the diets reduced the oxidative stress (GST, SOD) and significantly decreased fish mortality after the challenge with S. parasitica. Dietary supplementation with A. cepa reduced cadmium accumulation in fish organs and up-regulated IL-1β and IFNɣ levels. The most favorable benefits were obtained by the addition of 0.5% A. cepa extract. Our results highlight the immunostimulatory properties of A. cepa dietary supplementation for farmed tilapia and recommend its use prophylactically to control saprolegniasis and mitigate cadmium adverse effects.

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Section: Introductionmentioning

confidence: 99%

Onion (Allium cepa) improves Nile tilapia (Oreochromis niloticus) resistance to saprolegniasis (Saprolegnia parasitica) and reduces immunosuppressive effects of cadmium

et al. 2022

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“…Exposure to extreme pH values generally results in damage (chemical burn), gas exchange and osmoregulation disturbances in the surface of the whole fish body (e.g. the skin and gills) (Ibrahim, 2020). Pathogens as bacterial growth is affected by pH levels.…”

Section: Resultsmentioning

confidence: 99%

A systematic review and meta‐analysis of the relationship between farm management, water quality and pathogen outbreaks in tilapia culture

Paredes-Trujillo

Mendoza‐Carranza

2022

Journal of Fish Diseases

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A systematic review and meta‐analysis of on farm management and water quality as risk factors triggering pathogen outbreaks in tilapia culture is presented. A total of 121 papers from 28 countries, 37 devoted to management and 84 to water quality associated with the presence of pathogens in tilapia culture were analysed. Most of research has been made on ponds, focusing on bacteria and metazoans. Meta‐analysis reveals the proportion of research showing statistical inferences between management (34%), water quality (38% for bacteria and 16.2% for metazoans) and pathogen outbreaks. The most cited parameters related to pathogens outbreaks were temperature (>30°C), dissolved oxygen (<5.0 mg/L), pH (<8.0) and ammonia (1.0 >mg/L) 65, 38, 32 and 34 papers, respectively. However, statistical inference was <20%. Meta‐analysis reveals tendencies between high temperatures (30–35°C), low dissolved oxygen (<5 mg/L) and high NH3 (1–5 mg/L) with pathogen outbreaks. Despite the knowledge about the relationship between management and water quality as factors for pathogen effects, most information is descriptive and empirical. Future research on tilapia culture outbreaks should be focused on the effects of multiple stressors affecting tilapia pathogen outbreaks, thereby generating strategies to prevent diseases and financial losses.

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“…and Ichthyophthirius multifiliis , has been extensively studied and characterized in tilapia 21,22 . In general, juvenile stages of tilapia are more vulnerable to protozoan infestations than adults 20,23,24 . In addition, higher temperatures have been reported to be a key risk factor for protozoan infestations on tilapia farms 20,24–27 …”

Section: Review Of Infectious Agents Of Tilapiamentioning

confidence: 99%

“…Outbreaks with monogenean parasites may impact production on tilapia farms, especially in pond culture systems 28 . Monogenean infections are commonly associated with parasites belonging to the Dactylogyridae and Gyrodactylidae families, as well as the Cichlidogyrus genus 24 . Gyrodactylids, such as Gyrodactylus cichlidarum , are one of the most common monogenean species infecting young Nile tilapia ( Oreochromis niloticus ) and have the potential to cause substantial mortality in intensively farmed fish around the world 29 .…”

Section: Review Of Infectious Agents Of Tilapiamentioning

confidence: 99%

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Improving tilapia biosecurity through a value chain approach

MacKinnon

Debnath

Bondad‐Reantaso

et al. 2023

Reviews in Aquaculture

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Tilapia aquaculture is a major source of animal protein, with global production reaching over 6 million tonnes in 2020. The rapid growth of the tilapia sector has led to a number of emerging disease threats and subsequent production losses. Risk analysis can provide a targeted approach for improving biosecurity in the tilapia sector. The aim of this work was to describe the tilapia value chain and review the important infectious agents of tilapia that may affect the different points along the value chain; such points include input and service suppliers, producers (i.e., hatcheries, nurseries and grow‐out farms), and processors, traders and marketers. We then describe how risk analysis can be used to identify critical controls points along the value chain and describe potential risk mitigation measures that may be implemented at those points. The control of diseases of tilapia requires a multi‐faceted approach, with risk‐based control measures chosen based on their feasibility, effectiveness and sustainability. The Progressive Management Pathway for Improving Aquaculture Biosecurity, as a risk‐based, collaborative and progressive management approach combined with the systematic preventive principles of Hazard Analysis Critical Control Point, offers a strategic and practical way of improving biosecurity in the tilapia value chain.

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Diseases of Nile Tilapia with Special Emphasis on Water Pollution

Cited by 22 publications

References 58 publications

Onion (Allium cepa) improves Nile tilapia (Oreochromis niloticus) resistance to saprolegniasis (Saprolegnia parasitica) and reduces immunosuppressive effects of cadmium

Onion (Allium cepa) improves Nile tilapia (Oreochromis niloticus) resistance to saprolegniasis (Saprolegnia parasitica) and reduces immunosuppressive effects of cadmium

A systematic review and meta‐analysis of the relationship between farm management, water quality and pathogen outbreaks in tilapia culture

Improving tilapia biosecurity through a value chain approach

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