E-ISSN 2536-9520 | ISSN 1110-2047
 

Original Article 


Consequences of High-Density Fish Culture as Monitored By Growth, Behavior and Immune Responses of Nile Tilapia (Oreochromis niloticus)

Ramy M. Shourbela, Sherif Z. El-Kholya, Medhat El-Fadadney.

Abstract
An experiment was performed in a twelve weeks period at three varied stocking densities: low density (LD, 100 fish m-3), medium density (MD, 200 fish m-3) and high density (HD, 400 fish m-3) to analyze the biological performances and ingestive behaviour, of Nile tilapia (Oreochromis niloticus) and Lately, fish were challenged with Aeromonas hydrophila to evaluate the cumulative mortality (%). Stocking density had no effect on survival rate, the final weight markedly reduced with increased density, ingestive behaviour was higher in fish reared in MD than fish reared in LD, however, fish at HD have a higher feed intake (%) and feed conversion ratio. Fish at LD showed marked higher levels of total protein, albumin and globulin compared with those reared at HD. plasma glucose and cortisol levels were high in HD contrast to LD and MD groups. LD fish had higher RBCs and WBCs parallel to MD and HD. similarly, lymphocytes, neutrophils, and monocytes (%) decreased with increasing density. In addition, Serum antioxidant and lysozyme enzymes were considerably (P<0.05) higher in LD compared with MD and HD groups, Meanwhile, Phagocytic index were significantly higher in MD compared with LD and HD groups. Finally, cumulative mortality (%) in HD groups was markedly higher (χ2 = 6.257**) than MD and LD groups. Overall, our results show that higher stocking density caused chronic stress in Oreochromis niloticus and consequently altered the biological performances, ingestive behaviour, compared with fish kept at low and medium stocking densities.

Key words: Nile tilapia, Biological performances, ingestive behaviour, Physiology, Immune, challenge.


 
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Pubmed Style

Ramy M. Shourbela, Sherif Z. El-Kholya, Medhat El-Fadadney. Consequences of High-Density Fish Culture as Monitored By Growth, Behavior and Immune Responses of Nile Tilapia (Oreochromis niloticus). AJVS. 2017; 53(2): 45-53. doi:10.5455/ajvs.267244


Web Style

Ramy M. Shourbela, Sherif Z. El-Kholya, Medhat El-Fadadney. Consequences of High-Density Fish Culture as Monitored By Growth, Behavior and Immune Responses of Nile Tilapia (Oreochromis niloticus). http://www.alexjvs.com/?mno=267244 [Access: August 17, 2021]. doi:10.5455/ajvs.267244


AMA (American Medical Association) Style

Ramy M. Shourbela, Sherif Z. El-Kholya, Medhat El-Fadadney. Consequences of High-Density Fish Culture as Monitored By Growth, Behavior and Immune Responses of Nile Tilapia (Oreochromis niloticus). AJVS. 2017; 53(2): 45-53. doi:10.5455/ajvs.267244



Vancouver/ICMJE Style

Ramy M. Shourbela, Sherif Z. El-Kholya, Medhat El-Fadadney. Consequences of High-Density Fish Culture as Monitored By Growth, Behavior and Immune Responses of Nile Tilapia (Oreochromis niloticus). AJVS. (2017), [cited August 17, 2021]; 53(2): 45-53. doi:10.5455/ajvs.267244



Harvard Style

Ramy M. Shourbela, Sherif Z. El-Kholya, Medhat El-Fadadney (2017) Consequences of High-Density Fish Culture as Monitored By Growth, Behavior and Immune Responses of Nile Tilapia (Oreochromis niloticus). AJVS, 53 (2), 45-53. doi:10.5455/ajvs.267244



Turabian Style

Ramy M. Shourbela, Sherif Z. El-Kholya, Medhat El-Fadadney. 2017. Consequences of High-Density Fish Culture as Monitored By Growth, Behavior and Immune Responses of Nile Tilapia (Oreochromis niloticus). Alexandria Journal of Veterinary Sciences, 53 (2), 45-53. doi:10.5455/ajvs.267244



Chicago Style

Ramy M. Shourbela, Sherif Z. El-Kholya, Medhat El-Fadadney. "Consequences of High-Density Fish Culture as Monitored By Growth, Behavior and Immune Responses of Nile Tilapia (Oreochromis niloticus)." Alexandria Journal of Veterinary Sciences 53 (2017), 45-53. doi:10.5455/ajvs.267244



MLA (The Modern Language Association) Style

Ramy M. Shourbela, Sherif Z. El-Kholya, Medhat El-Fadadney. "Consequences of High-Density Fish Culture as Monitored By Growth, Behavior and Immune Responses of Nile Tilapia (Oreochromis niloticus)." Alexandria Journal of Veterinary Sciences 53.2 (2017), 45-53. Print. doi:10.5455/ajvs.267244



APA (American Psychological Association) Style

Ramy M. Shourbela, Sherif Z. El-Kholya, Medhat El-Fadadney (2017) Consequences of High-Density Fish Culture as Monitored By Growth, Behavior and Immune Responses of Nile Tilapia (Oreochromis niloticus). Alexandria Journal of Veterinary Sciences, 53 (2), 45-53. doi:10.5455/ajvs.267244





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