Long‐term incorporation of Selenium and Zinc in microalgae Isochrysis galbana and Nannochloropsis oculata and its effects on rotifer. (16th March 2022)

• Record Type: Journal Article
• Authors: Ahmadifard, Nasrollah; Ghaderpour, Sirwe; Agh, Naser; Vahabzadeh, Zakaria; Estevez, Alicia
• Is Part Of: Aquaculture research. Volume 53:Number 8(2022)
• Page Start: 3188
• Page End: 3201
• Publication Date: 2022-03-16
• Subjects: cell size -- live food -- long‐term enrichment -- microalgae -- minerals -- rotifer; Aquaculture -- Periodicals; Fishery management -- Periodicals; 639.8
• DOI: 10.1111/are.15831
• Languages: English
• ISSNs: 1355-557X

Abstract

Abstract: Rotifers are widely used in hatcheries to feed small‐sized aquatic larvae although one of their disadvantages is the lack of zinc and selenium 5‐ and 30‐fold lower than in copepods, respectively. To improve the rotifers quality, different concentrations of zinc and selenium (2, 4, 5 and 10 mg L −1 of each mineral) were added to the medium of the microalgae Isochrysis aff. galbana and Nannochloropsis oculata for 4 days, and then the microalgae were harvested and concentrated to feed the rotifers. N . oculata accumulated a greater amount of Zn and Se into cells than I . galbana . The cell size of algae given 0, 2, and 4 mg L −1 of minerals did not change in both microalgae, but enrichment of the microalgae with the 5 and 10 mg L −1 decreased the sizes and paled the colour of cells and increased cell division. The 2 mg L −1 was the best group for rotifers in terms of growth (population density, number of eggs, egg ratio, Specific growth rate, the maximum number and doubling time), and contained the second‐highest level of Zn (69.26 ± 0.60) and Se (103.5 ± 5.0) content within a safe limit. Thus, rotifers enriched with Se and Zn can be used as a mineral delivery method to cover the nutritional requirements of marine larvae.