This May, we present a concise overview of some intriguing discoveries we have found! There is a new way to detect antibiotics in fish, a trick to clean fish farm water using a type of algae, and even a smart digital method for accounting for the amount of carbon in aquaculture systems.

We also discovered that some substances in sea sponges may have the potential to fight cancer! We will also discuss chitosan-based compounds that can help eliminate toxins from shellfish. And finally, we analyze how different drying methods can alter the chemical composition of algae and how gene editing can help ensure the food safety of lab-grown fish. Don’t miss it!

AQUACULTURE

Identification of multi-class antibiotics in fish muscle using a QuEChERS-UHPLC-MS/MS method

The QuEChERS method combined with high-performance liquid chromatography and tandem mass spectrometry was used to detect 10 multi-class antibiotics in the muscle tissue of farmed fish (European sea bass and sea bream). The method showed high recovery rates (mostly 70-120%) and complied with EU standards for maximum residue limits. Analysis of twenty fish samples revealed the absence of most antibiotics, with the exception of oxolinic acid and tilmicosin in sea bass, both below the method’s limit of quantification.

NCBI
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The use of a by-product from Chlorella ellipsoidea biodiesel production for the treatment of aquaculture discharges

Filters composed of a by-product of Chlorella ellipsoidea (lipid-free biomass) for the treatment of aquaculture wastewater and methods for removing ammonia, phosphorus, and organic matter from aquaculture wastewater using these filters. The filters have several layers of a compressed lipid-free biomass by-product of Chlorella ellipsoidea from biodiesel production, where each of the several layers can be changed separately.

Espacenet
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An intelligent digital methodology for aquaculture carbon accounting and carbon sink capacity assessment

The present invention relates to a digital method for aquaculture carbon accounting and carbon sink capacity assessment, comprising: calculating the total carbon source and total carbon sink of various aquaculture species in one or more aquaculture waters, and digitally processing the total carbon source and total carbon sink of various aquaculture species in each aquaculture water to obtain a net carbon sink matrix.

Espacenet
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LIVE MARINE RESOURCES

Meroterpenoids from the marine sponge Hyrtios sp. and anticancer activity against human colorectal cancer cells

Two new meroterpenoids, hirtamide A (1) and hirfarnediol A (2), together with two already known compounds, the methyl ester of 3-farnesyl-4-hydroxybenzoic acid (3) and dictyoceratine C (4), were isolated from a sponge from the South China Sea, Hyrtios sp. Their structures were identified by NMR and MS. Compounds 2-4 showed weak cytotoxicity against human colorectal cancer cells (HCT-116). Additionally, compounds 3 and 4 significantly suppressed the invasion of HCT-116 cells, while reducing the expression of vascular endothelial growth factor receptor 1 (VEGFR-1) and vimentin proteins, which are key markers associated with angiogenesis and epithelial-mesenchymal transition (EMT).

NCBI
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The potential of chitosan-based composites for the adsorption of shellfish toxins

In this study, low-cost composites were produced and tested to adsorb ocadaic acid (OA) in salt water. The composites were produced with chitosan of different molecular weights (CH-LW and CH-MW), activated carbon (AC), and montmorillonite (MMT). Characterization showed variable interactions between CH-LW and CH-MW with AC and MMT. Among the composites tested (CH-LW/AC, CH-MW/AC, CH-MW/AC/MMT, CH-MW/MMT), CH-MW/MMT showed the lowest OA adsorption efficiency due to structural reasons, while CH-MW/AC showed the highest OA adsorption.

NBCI
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The Impact of Different Drying Methods on the Metabolomic and Lipidomic Profiles of Arthrospira platensis

In this study, the impacts of eight different drying methods on the metabolome and lipidome of Arthrospira platensis were investigated. The drying methods studied were freeze drying (FD), sun drying (SD), air drying at 40°C and 75°C (AD’ and AD″), infrared drying at 40°C and 75°C (IRD’ and IRD″), and vacuum drying at 40°C and 75°C (VD’ and VD″). The results showed that, with the exception of the FD method, recognized as a control, the most protective method was AD’. In contrast, VD’ and VD″, under the conditions used, promoted more pronounced degradation of metabolites.

NBCI
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MARINE BIOTECHNOLOGY

Why gene editing can help aquaculture improve global food security

Genome-edited fish are already being farmed by aquaculture companies in Japan, and the technology has enormous potential to improve environmental management and productivity in the sector, as well as disease resistance.

TheFishSite
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Method for preparing cultured fish cells with a muscle shape that mimics fish muscle, using 3D bioprinting technology

The present invention presents a method for preparing edible fish cell cultures that can result in a muscular form, a real taste, and a cell-cultured fish, using 3D bioprinting technology. The invention includes the steps of: mixing cells for cell culture and edible bioprinting ink.

Espacenet
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