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. 2022 Dec 29;13(1):136.
doi: 10.3390/ani13010136.

Phytase Supplementation under Commercially Intensive Rearing Conditions: Impacts on Nile Tilapia Growth Performance and Nutrient Digestibility

Edgar Junio Damasceno Rodrigues  1 , Paulo Incane Ito  1 , Lucas Franco Miranda Ribeiro  1 , Pedro Luiz Pucci Figueiredo de Carvalho  1   2 , William Dos Santos Xavier  1 , Matheus Gardim Guimarães  1 , Ademir Calvo Fernandes Junior  1 , Luiz Edivaldo Pezzato  1 , Margarida Maria Barros  1
Affiliations

Phytase Supplementation under Commercially Intensive Rearing Conditions: Impacts on Nile Tilapia Growth Performance and Nutrient Digestibility

Edgar Junio Damasceno Rodrigues et al. Animals (Basel). .

Abstract

This study evaluated the effects of phytase supplementation on growth performance and apparent digestibility of Nile tilapia (Oreochromis niloticus) in a commercial fish farm setting. Nile tilapia (6300 male, 57.48 ± 1.04 g) were randomly stocked into 42 floating cages. The experimental design was completely randomized, comprising six treatments and seven replications. Fish were fed five phosphorus deficient plant-based diets with graded levels of phytase supplementation (0, 500, 1000, 1500, 2000 UF kg-1) and an additional diet containing phosphorus supplementation to meet the requirement of this fish species (positive control). After 97 days of feeding, growth performance data were collected and 900 fish (500 ± 10 g) were relocated to 6 floating cages for the digestibility assessment. Quadratic polynomial regression analysis indicated 1537.5 and 1593.2 UF kg-1 as the optimum dietary levels for daily weight gain and feed conversion rate, respectively. Including 2000 UF kg-1 resulted in the higher dry matter, crude protein, energy, and ash apparent digestibility coefficient values. Therefore, phytase supplementation from 1500 to 2000 UF kg-1 is recommended to enhance growth performance and nutrient bioavailability of Nile tilapia reared according to industry practices.

Keywords: Oreochromis niloticus; digestibility; feed additive; fish farming; floating cages.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Daily weight gain of Nile tilapia fed diets supplemented with graded levels of phytase. The black points represent the seven replicates of each dietary treatment. Lines were used to mark the optimum supplementation level of phytase determined by the quadratic regression.
Figure 2
Figure 2
Feed conversion rate of Nile tilapia fed diets supplemented with graded levels of phytase.
See this image and copyright information in PMC

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