Yucca schidigera Extract Dietary Supplementation Affects Growth Performance, Hematological and Physiological Status of European Seabass

Abdallah Tageldein Mansour,Eglal Ali Omar,Sabrin Abdelrahman Morshedy,Bassem Khalil Elkhayat,Abdel-Aziz Moussa Nour,Mohamed A Zaki,Walied Mohamed Fayed

doi:10.2478/aoas-2021-0007

Abdallah Tageldein Mansour, Eglal Ali Omar + Show 5 more

Open Access

https://doi.org/10.2478/aoas-2021-0007

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Abstract

Abstract The study herein evaluated the effects of dietary supplementation with different yucca (Yucca schidigera) extract levels on rearing water quality, growth performance, protein utilization, hematological and immunological status, and economic benefits of cultured European seabass (Dicentrarchus labrax) juveniles. Yucca extract (YE) was incorporated in an experimental diet at levels of 0, 0.25, 0.50, and 1 g YE kg−1, and offered to fish reared in 70-L glass aquaria (15 fish per aquarium; three replicates each). Dietary YE supplementation significantly (P<0.05) decreased ammonia-nitrogen levels in water. Compared with the control, groups fed 0.50 and 1 g YE kg−1 diets showed improved growth performance (by 26.02% and 36.98%, respectively) and protein efficiency ratio (by 31.39% and 37.29%, respectively). In addition, hematological parameters (red blood cells, hemoglobin, hematocrit, white blood cells and neutrophil) and innate immune parameters (globulin fractions and lysozyme activity) improved with increasing dietary YE levels. Growth, hematological, and immunological parameters increased with a polynomial second-order regression models, with curves peak close to 1 g YE kg−1 diet. The cortisol level decreased significantly (P<0.05) with increasing dietary YE levels. The groups fed the 0.50 and 1 g YE kg−1 diets generated significantly (P<0.05) higher revenue than groups fed the 0.25 g YE kg−1 and the control diets. The using of YE is recommended as a dietary feed additive at a level of 1 g kg−1 for reducing the environmental footprint of fish protein production, accelerating growth, and improving health status of cultured seabass in a short-term feeding period.

Highlights

Yucca schidigera (Mojave yucca) grows in the deserts of southwestern USA and Mexico (Tenon et al, 2017)
The ability of yucca to grow in arid regions with high temperature and low water availability maximizes its potential use as a future sustainable feed additive, in the regions that are likely to experience a new dimension of global warming (Adegbeye et al, 2019)
Water quality parameters The water quality parameters of aquaria harboring D. labrax fingerlings fed diets supplemented with different levels of Yucca extract (YE) are illustrated in Table 2 and Figure 1

Summary

Introduction

Yucca schidigera (Mojave yucca) grows in the deserts of southwestern USA and Mexico (Tenon et al, 2017). The ability of yucca to grow in arid regions with high temperature and low water availability maximizes its potential use as a future sustainable feed additive, in the regions that are likely to experience a new dimension of global warming (Adegbeye et al, 2019). The YE has been firstly used for environmental considerations of controlling global warming greenhouse gases, it has several desirable biological effects in the animal body (Adegbeye et al, 2019). Taking this previous knowledge into consideration, the present study was designed to investigate and evaluate the effectiveness of dietary supplementation of YE on water quality, zootechnical performance, protein utilization, hematological and immunological status, cortisol level, and economic revenue in cultured European seabass, D. labrax, juveniles

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