Comparative impact of replacing fish meal with azolla on growth, water quality, and physiology of red tilapia fingerlings at varying salinities

Sallam GR 1 , Helal AM 1 , Mabrouk HAH 1 , Hermina AHFG 2 , Habib YJ 3 , Fayed WM 2 Show all authors , Dossou S 4 , El Basuini MF 5 , Shehata AI 2

Affiliations 

  • 1 Fish Rearing Lab., Aquaculture Division, National Institute of Oceanography and Fisheries (NIOF), Alexandria, Egypt
  • 2 Department of Animal and Fish Production, Faculty of Agriculture (Saba Basha), Alexandria University, Alexandria, Egypt
  • 3 Department of Medical Analysis, Tishk International University, Erbil, Iraq
  • 4 WorldFish, Jalan Batu Maung, Bayan Lepas, Malaysia
  • 5 Animal Production Department, Faculty of Agriculture, Tanta University, Tanta, Egypt
J Anim Physiol Anim Nutr (Berl), 2024 Sep;108(5):1370-1382.
PMID: 38689484 DOI: 10.1111/jpn.13980

Abstract

A 210-day experiment to assess the efficacy of substituting azolla plant powder at levels of 0, 20, 40, and 60% for fish meal on red tilapia fingerlings (RTF, initial weight of 18.23 ± 0.12 g) performance under salinity levels of 5, 18, and 28ppt. Among the various conditions, RTF-fed 20% azolla at 28 and 5ppt salinity showcased the highest specific growth rate (SGR), whereas the lowest SGR was observed in fish-fed 60% azolla at 5ppt salinity. Upon azolla incorporation, noteworthy elevations in phytoplankton, zooplankton, dissolved oxygen (DO), pH, NH3, and NO3 were noted and conversely, azolla introduction led to decreased NH4 and NO2 concentrations in all salinity levels. Further, a significant (p 

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