The dietary supplementation of Haematococcus pluvialis is a natural, safe, and sustainable method for fish pigmentation. However, astaxanthin-rich H. cysts have poor effect in pigmenting salmonid flesh due to their rigid thick cell wall. thin-walled motile cells recently attracted attention potential advantages maintaining compound stability, easy digestion, enhancing the bioavailability carotenoids, reducing production costs. This study aimed investigate various nitrogen concentrations...

Euchlorocystis marina , a new marine species of the genus discovered in 2022, has potential to improve water quality mariculture ponds. However, effects salinity on growth, physiology, and biochemical composition these algae are not well understood. In this study, changes physiological indices such as cell density, photosynthetic pigment, polysaccharide, lipid content E. under different treatments were analyzed. The results showed that highest density was observed at 15‰. lowest pigment 60‰,...

Haematococcus pluvialis, as the best natural resource of astaxanthin, is widely used in nutraceuticals, aquaculture, and cosmetic industries. The purpose this work was to compare differences astaxanthin accumulation between motile nonmotile cells H. pluvialis determine relationship two production. experiment design achieved by different types cell three light intensities for an eight day induction period. concentrations cultures were significantly increased compared cultures. increase...

The alcohol industry discharges large quantities of wastewater, which is hazardous and has a considerable pollution potential. Cultivating microalgae in wastewater an alternative way overcoming the current high cost cultivation environmentally friendly treatment method for industrial effluents. study analyzed growth biochemical composition Chlorella vulgaris cultivated membrane-treated distillery (MTDW) nutrients removal efficiency. results showed biomass productivity 0.04 g L −1 d MTDW with...

To enhance the nutrient removal efficiency of Oocystis borgei for mariculture wastewater (MW), effects and processes three phytohormones on nitrogen phosphorus from synthetic (SMW) by O. under sequential batch operation were compared. The findings revealed that supplementation with 10−6 M 3-indoleacetic acid (IAA), gibberellic (GA3), zeatin (ZT) resulted in most effective elimination, while there was no appreciable difference among them. indices effluent dramatically reduced (p < 0.01)...

The production of fucoxanthin and fatty acids in Conticribra weissflogii has been examined, but there is still a lack understanding regarding the impact trace elements, including iron, on their co-production. To address this knowledge gap, study investigated effects FeCl3·6H2O growth, fucoxanthin, C. weissflogii. findings revealed that highest cell density (1.9 × 106 cells mL−1), dry weight (0.89 ± 0.15 g L−1), total acid concentration (83,318.13 µg g−1) were achieved at an iron 15.75 mg...

The current commercial production of natural astaxanthin is mainly carried out using Haematococcus pluvialis vegetative cells in the "two-stage" batch mode. motile are more sensitive to stress than nonmotile cells, thereby affecting overall productivity H. cultures. In this study, we compared differences between and productivity, morphological changes, mortality rate, diameter formed cysts. experimental design was achieved by two different types cell under continuous light 80 μmol photons...

Astaxanthin from H. pluvialis is an antioxidant and presents a promising application in medicine for human health. The two-stage strategy has been widely adopted to produce astaxanthin by the Haematococcus industry research community. However, cell death low productivity have seriously affected stability of production. This study aims test effect transformation strategies on production determine optimal initial biomass density (IBD) red stage. experimental design divided into two parts, one...

The apparent digestibility coefficients (ADCs) of dry matter, crude protein, lipid, ash, phosphorus, gross energy and amino acids 10 selected ingredients for juvenile hybrid tilapia (7.05 ± 0.09 g) were determined using 0.5% Cr2O3 as an inert indicator. feed tested in this study corn gluten meal (CGM), byproduct, germ (CG), soybean (SBM), fermented (FSM), soy protein concentrate (SPC), isolate, malt sprouts (MS), fish (FM) earthworm (EM). test diets prepared by incorporation 30% into the...

Pseudodiaptomus dubia is a calanoid copepod that distributed widely in the estuarine-coastal waters of Asia and dominant shrimp grow-out ponds southern China. A laboratory culture experiment was conducted to evaluate influences water temperature on larval development, survival, reproduction. Results indicate within range from 15 35 C degrees, development increases as increases. The for optimal survival rate ranges 20 degrees. Longevity egg hatching time decrease Total fecundity reproduction...

The algae, Oscillatoria , is commonly found in prawn ponds and can lead to reduced productivity. We examined metabolites of the bacteria Brevibacillus laterosporus for algicidal qualities. To determine possible mechanisms these bioactive metabolites, different amounts sterile filtrate bacterial suspensions were added cultures containing . dry weight, concentrations chlorophyll-a (chl-a), phycobiliprotein (PC, phycocyanin; APC, allophycocyanin; PE, phycoerythrin), MDA (malondialdehyde)...

Fucoxanthin and fatty acids are active substances that beneficial to the growth immunity of humans aquatic animals. However, relatively few species have been exploited for fucoxanthin in industry. At same time, due its low extract content, poor stability, high production cost, serious seasonal regional limitations, industry cannot normally meet greater demand international market. Therefore, this experiment seeks improve acid content C. weissflogii by adjusting nitrogen concentration culture...

The effects of temperature, salinity, and illumination on the nitrite uptake rate microalgae–bacteria consortia Oocystis borgei Rhodopseudomonas palustris were investigated. absorption rates contribution each component in under different temperatures (15, 20, 25, 30, 35 °C), illuminations (0, 15, 35, 45 μmol·m−2·s−1), salinities 5, 35‰) determined by stable isotope labeling technique. single combined three environmental factors analyzed using single-factor orthogonal experiments. experiment...

Fucoxanthin is a natural active substance derived from diatoms that beneficial to the growth and immunity of humans aquatic animals. Temperature, light salinity are important environmental factors affecting accumulation diatom actives; however, their effects on production fucoxanthin in C. weissflogii unclear. In this study, single-factor experiments designed followed by an orthogonal experiment determine optimal combination conditions weissflogii. The results showed optimum for were...

This study evaluated the possibility of using Oocystis borgei to prevent and control harmful algae blooms. Firstly, Microcystis aeruginosa O. were co-cultured assess competition for nutrients between them. Different physiological biochemical parameters, such as growth, cell membrane permeability esterase activities determined in exudate culture experiment investigate allelopathic effects mixed cultures (O. M. aeruginosa) at different growth phase on microalgae (M. aeruginosa). Results showed...

Natural astaxanthin helps reduce the negative effects caused by oxidative stress and other related factors, thereby minimizing damage. Therefore, it has considerable potential broad application prospects in human health animal nutrition. Haematococcus pluvialis is considered to be most promising cell factory for production of natural astaxanthin. Previous studies have confirmed that nonmotile cells H. are more tolerant high intensity light than motile cells. Cultivating as dominant type red...

It is widely accepted that eutrophication has played an important role in the formation of harmful cyanobacterial blooms recent decades, which impacts water quality and ecological environment causes huge economic losses. Algicidal bacteria have a promising application prospect controlling aquaculture water. Here, process algicidal bacterium Brevibacillus laterosporus strain Bl-zj acting on Microcystis aeruginosa was explored using transcriptome analysis to elucidate mechanism. The results...

Calanoid copepods are key components of the marine food web and sources many larval fishes planktivores, grazers phytoplankton. Understanding ranges major environmental variables suitable for their growth is essential to maintain balance between trophic links resources protection. In this study, effects temperature, salinity, pH, light intensity on filtering grazing rates a herbivorous copepod (Schmackeria dubia) were conducted in several control experiments. Our results indicated that...

Harmful algal blooms caused huge ecological damage and economic losses around the world. Controlling by algicidal bacteria is expected to be an effective biological control method. The current study investigated molecular mechanism of harmful cyanobacteria disrupted bacteria. Microcystis aeruginosa was co-cultured with Brevibacillus laterosporus Bl-zj, RNA-seq based transcriptomic analysis performed compared M. aeruginosa, which cultivated separately. A total 1706 differentially expressed...