Use of seaweed Ulva lactuca for water bioremediation and as feed additive for white shrimp Litopenaeus vannamei

Abstract

Two experimental feeding trials were conducted during four weeks to evaluate the use of Ulva lactuca in shrimp culture: (1) for wastewater bioremediation, and (2) using different inclusion levels of U. lactuca meal in shrimp feed. In feeding trial 1, shrimp reared under seaweed U. lactuca water exchange in a re-circulation system (SWE) resulted in similar growth and feed utilization as shrimp reared with clean water exchange (CWE). Shrimp under no water exchange (NWE) resulted in significant lower growth and higher feed conversion rate (FCR) compared to the other treatments (p < 0.05). Nitrogen compounds and phosphate in water from SWE and CWE treatments did not present significant differences during the experimental trial (p > 0.05). In feeding trial 2, U. lactuca biomass produced by wastewater bioremediation in SWE treatment were dried and ground to formulate diets containing 0, 1, 2, and 3% U. lactuca meal (0UL, 1UL, 2UL, and 3UL). Shrimp fed the 3 UL diet resulted in a significant (p < 0.05) improvement of growth and FCR, and enhanced whole shrimp lipid and carotenoid content by 30 and 60%, respectively, compared to control diet. Seaweed U. lactuca is suggested as a desirable species for wastewater bioremediation in integrated aquaculture systems, and its meal as a good feed additive for farmed shrimp.

A comparison of the bioremediation potential of five seaweed species in an integrated fish‐seaweed aquaculture system: implication for a multi‐species seaweed culture

“…The phosphate uptake rate was 0.40-0.66 g m −2 day −1 , which equated to an uptake efficiency of 30-43% among the five species. Considering the uptake rates and efficiencies reported in previous studies for seaweed species (reviewed by Troell et al 2003;Copertino et al 2009;Al-Hafedh et al 2012;Ben-Ari et al 2014;Elizondo-González et al 2018;Ashkenazi et al 2019), these results suggest that the five seaweed species have the potential to act as biofilters in integrated fish-seaweed aquaculture systems. Seaweed species with divergent life histories and ecological characteristics exhibit nitrogen form-specific biofiltration activities.…”

Effect of the macroalgae Asparagopsis taxiformis on methane production and rumen microbiome assemblage

“…Algae are a stable component of the human diet in some cultures [ 11 ] and have also been used as feed for agricultural products such as abalone [ 12 ] and shrimp [ 13 ]. The ability of algae to promote well-being and health is mediated to a great extent by highly bioactive secondary metabolites [ 14 – 16 ] that are synthesized by some algal species [ 17 ].…”

Prospects for upgrading by the European kelp sector

“…A last upgrading strategy deployed does not fit within the categories identified by Gereffi and Fernandez-Stark (2016). Scientific publications have not only investigated the positive impact of seaweed on water quality and ecosystem status but also studied use of seaweed for bioremediation and carbon sink (Wood et al 2017;Elizondo-González et al 2018;Hasselström et al 2018). Krause-Jensen et al (2018) argue that incorporation of seaweeds into carbon emission accounting is an imperative.…”

“…Seaweeds are expected to be used in a range of fields: food (Nayar and Bott 2014;Roleda et al 2010), feed (Mac Monagail et al 2018), feedstock for the biobased economy (Stévant et al 2017;Helmes et al 2018), pharmaceutical applications (Kang et al 2016), cosmetics (Couteau and Coiffard 2016) and bioremediation i.e. removing pollutants from the aquatic environment (Elizondo-González et al 2018).…”