Abstract
The influence of fish steroid hormones on algal (Scenedesmus quadricauda) physiology was investigated, as it is relevant to the use of fishery wastewaters for microalgae biomass production. S. quadricauda was exposed to two steroids, 17β-estradiol (E2) and 17,20,β-dihydroxy-4-pregnen-3-one (17,20β-P), commonly found in fish farm effluents. These hormones demonstrated stimulatory effects on S. quadricauda cell growth and accumulation of chlorophyll-a, total carotenoids, and lipids. Both steroids promoted total carotenoid accumulation to higher degree than they promoted chlorophyll accumulation. E2 was a more powerful inducer of the accumulation of total carotenoids and lipids compared with 17,20β-P. The work was conducted to evaluate the possibility of integrating cold-water fish farming with algae production to maximize nutrient recycling in aquaculture wastewaters. Our data suggest that nano-concentrations of fish sex hormones in aquaculture wastewaters could be used to enhance both algae biomass production and the synthesis of high-value molecules.
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