Comparative study on growth, survival and pigmentation ofSolea aegyptiacalarvae by using four different microalgal species with emphasize on water quality and nutritional value

Abstract

This study aimed to evaluate appropriate water sources to improve Solea aegyptiaca aquaculture from larval to the juvenile stage using two water sources (Eastern Harbour (EH) and MaxWell (MW)). Firstly, four microalgae's nutritional value (Nannochloropsis salina, N. oculata, Chlorella salina and Tetraselmis chuii) was assessed in both water sources. MW of high nitrate content enhanced the algal biomass and biochemical composition of all species compared to EH. MW-N. salina showed the highest growth and biochemical contents among the investigated species and yielded Artemia franciscana with a considerable amount of arachidonic acid (ARA), eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) compared to EH. Secondly, Artemia enriched MW-N salina was used to improve S. aegyptiaca quality in both water sources from 10-48 days posthatch at a density of 15 larvae L −1. The MW-S. aegyptiaca exhibited a significant increase in morphometric parameters, albino percentages and recorded the highest ARA, EPA and DHA content (35.9, 6.1 and 15.9 µg g −1 , respectively) compared to that reared on EH. The study reports evidence of albinism of MW-S. aegyptiaca due to high dietary and ARA content. Overall, the seawater source has a significant impact on the whole food chain quality from microalgae to S. aegyptiaca.

Potential Applications of Native Cyanobacterium Isolate (Arthrospira platensis NIOF17/003) for Biodiesel Production and Utilization of Its Byproduct in Marine Rotifer (Brachionus plicatilis) Production

“…On the other hand, aquaculture is a promising industry that supplies essential and cheap animal protein to meet a growing world population [74,85]. Protein is considered the most important ingredients in aquaculture diets.…”

Effects of ocean acidification on the growth and biochemical composition of a green alga (Ulva fasciata) and its associated microbiota

“…In macroalgae, the lipids constitute a suitable storage material widely distributed, in different macroalgal classes ( Sudhakar et al, 2019 ). Lipid is a calorific component that can be used for aquaculture ( El‐Khodary et al, 2020 ) or feedstock for biodiesel ( Essa et al, 2018 ; Ashour et al, 2019 , Elshobary et al, 2019 , Huo et al, 2020 ). Despite the current study observed low lipid content (4.23 %DW), this is comparable with other reports, which showed the lipid content of macroalgae were<5% of dry weight ( Elshobary et al, 2020a , Khairy and El-Shafay, 2013 , Osman et al, 2020 ).…”

Impact of Commercial Seaweed Liquid Extract (TAM®) Biostimulant and Its Bioactive Molecules on Growth and Antioxidant Activities of Hot Pepper (Capsicum annuum)

“…The effective application is the use of biostimulants in the form of mixtures of phytochemicals that could induce plant growth and yield while they improve protection against biotic and abiotic stresses, without any drawbacks [ 4 , 5 , 6 , 7 ]. Marine organisms are rich in phytochemical biomolecules with diverse biological activities [ 8 , 9 , 10 , 11 , 12 , 13 , 14 ]. In this context, seaweeds would have been wielded as biostimulants [ 5 , 6 , 15 , 16 ].…”