Aquatic Products Research Articles

Current status of large-scale solar dryers in Cambodia: Operations, potential, and economic benefits of solar dryer domes

<p>Drying is commonly applied for preserving both freshwater and marine products for long-term use. In Cambodia, solar dryer domes (SDD) are constructed for large-scale processing, but the impacts of operation and maintenance on their lifespans are not well understood. Thus, this study aimed to (1) explore the characteristics of using SDDs and (2) determine the prospects and challenges related to the use of solar dryers for aquatic products. The study was conducted between March and July 2024 through a survey targeting fish processors that utilized SDDs and agreed to participate in the interviews. Because the number of SDDs available nationwide is small (< 25 units), the total sample size selected for the survey was only 8. The interviews were carried out in 4 provinces, focusing on topics such as annual processing production, SDD operation and maintenance (O&M), and additional sources of energy to support the system. The results show that SDDs were used not only for drying fresh fish but also for drying smoked fish and shrimp. Dried fish production was the largest (145.2 tons/year), 8.8–11.7 times greater than other production. With SDDs, products could be dried year-round, but gas heating systems were required to provide additional heat inside SDDs during cold seasons or cloudy days. Electrical fans were also added because of insufficient air circulations that might create moisture under the roofs. All the respondents were willing to continue using SDDs, expand production, and use their own budget to make more installations in case additional grid electricity was not required. It can be concluded that with the use of solar dryers, and fish/shrimp processing can be done at a large scale, but improvements in air circulation are needed to enhance the system’s effectiveness and efficiency. Furthermore, additional O&M training should be provided to ensure higher efficiency.</p>

A Comprehensive Assessment of the Nutritional Value, Antioxidant Potential, and Genetic Diversity of Fenneropenaeus merguiensis from Three Different Regions in China

Fenneropenaeus merguiensis is one of the largest species of penaeid shrimp. It has a wide distribution of germplasm resources in the South China Sea and the southeastern coastal regions of China, yet its germplasm characteristics remain insufficiently understood. Therefore, we conducted analyses of basic nutritional components, amino acids, fatty acids, antioxidant indices, and genetic diversity in three F. merguiensis populations (FmRP, FmSZ, FmSY). The results showed a significant difference in ash content, with FmSZ having the highest ash content (1.77 g/100 g) (p < 0.05). A total of 17 amino acids were detected, and FmSZ exhibited higher concentrations of most amino acids, especially essential amino acids (p < 0.05). The analysis of fatty acid composition revealed significant differences between the populations, with FmSY potentially having a nutritional advantage overall (p < 0.05). In terms of antioxidant capacity and genetic diversity, there were no significant differences in total antioxidant capacity (T-AOC), catalase (CAT), or superoxide dismutase (SOD) among the populations (p > 0.05). However, genetic analysis indicated that FmSZ had the lowest inbreeding coefficient and relatively higher genetic diversity. In conclusion, among the three F. merguiensis populations, FmSZ has relatively higher nutritional quality and genetic diversity, and F. merguiensis is a high-quality aquatic product worth promoting. The analysis and characterization of various aspects of F. merguiensis from the three locations provide important information and data support for germplasm resources and genetic breeding efforts.

Underlying mechanism of electrospun starch-based nanofiber mats to adsorb the key off-odor compounds of oyster peptides

The solid-phase adsorption principles and fundamental mechanism of isobutyric acid, 1-octen-3-ol, and octanal (three key off-odor compounds of oyster peptides) were explored using electrospun octenyl succinylated starch-pullulan (OSS-PUL) nanofiber mat. The nanofiber mats had selective adsorption behaviors as indicated by the selective adsorption rates of isobutyric acid, 1-octen-3-ol, and octanal, which were 94.96 %, 85.03 %, and 65.36 %. The contents of the II-type inclusion complexes (ICs) formed with the nanofiber mats by the three off-odor compounds mentioned above were significantly different. The mean fiber diameter of the octanal/nanofiber mat IC with the highest content of II-type IC was significantly decreased (p < 0.05). In contrast, the isobutyric acid/nanofiber mat IC did not significantly change. The findings suggested that nanofiber mats interacted most strongly with octanal and weakly with isobutyric acid. This study will provide the theoretical foundation for deodorizing aquatic products using electrospun starch-based nanofiber mats.

The effect of LuxR solo EvgA on the spoilage potential of Pseudomonas fluorescens

LuxR solos sense exogenous signaling molecules and regulate microbial behaviors, thus facilitating intra- and inter-species communication among bacteria. However, studies on the role of LuxR solos in regulating the spoilage potential of specific spoilage organisms are limited. In this study, we screened a LuxR solo EvgA, derived from Pseudomonas fluorescens PF08. qRT-PCR and molecular docking results indicated that EvgA responds and binds most strongly to exogenous N-3-tetradecanoyl-L-homoserine lactone (C14-HSL) through hydrogen bonds and hydrophobic interactions, with a –CDOCKER ENERGY of 45.87 kcal/mol. Subsequently, the evgA knockout (ΔevgA) and complementary evgA (ΔevgA-com) mutants of P. fluorescens PF08 were constructed through homologous recombination. ΔevgA mutants displayed diminished eavesdropping to exogenous C14-HSL (by 18.99 ±2.09%), reduced adhesion ability (by 30.33 ±0.36%), attenuated biofilm formation (by 15.97 ±0.14%), and decreased motility (swarming zones by 4.34 ±0.002 mm and swimming zones by 4.17 ±0.11 mm). In addition, EvgA deletion reduced spoilage factor production (hydrolysis zone), which included extracellular proteases, lipases, and biogenic amines (by 4.45 ±0.51 mm, 10.12 ±0.10 mm, and 14.41 ±0.57 mm, respectively), thereby diminishing the spoilage of salmon fillets stored at 4°C. Notably, the addition of exogenous C14-HSL promoted the spoilage ability of all strains. This study emphasizes the important role of LuxR solo EvgA in AHLs-mediated quorum sensing and the spoilage potential of P. fluorescens PF08, which is expected to be a new target for controlling the spoilage of aquatic products.

Facile synthesis of Metal-Organic Framework/Chitosan cryogel as a robust Scavenger for Diclofenac sodium

Diclofenac sodium (DS), a commonly detected contaminant in aquatic environments, poses a a significant risk to both the ecological balance and the safety of aquatic products. Therefore, efficient removal of DS from water is ergently needed but remains a major challenge. In this study, an environmentally friendly Fe-based metal–organic framework/chitosan (NH2-MIL-53(Fe)/CS) cryogel was prepared through a Schiff base condensation reaction under mild conditions. Taking advantage of the catalytic role of the MOF in accelerating the reaction between CS and 1,3,5-triformylphloroglucinol, NH2-MIL-53(Fe) powders were incorporated into the polymeric networks within 30 s. Owing to the rich binding sites, the resulting NH2-MIL-53(Fe)/CS cryogel demonstrated remarkable efficacy in eliminating DS from water. The adsorption process reached equilibrium within 120 min with a maximum adsorption capacity of 728.6 mg g−1. A comprehensive mechanistic investigation revealed that the exceptional adsorption capability of the NH2-MIL-53(Fe)/CS cryogel for DS was attributed to the synergistic effect of multiple interactions, including favorable hydrophilicity, electrostatic forces, π-π stacking, hydrogen bonding, and coordination. Thus, this study provides a straightforward and rapid synthesis route for MOF/CS cryogel, offering a promising adsorbent that combines exceptional adsorption performance with ease of separation. The resulting MOF/CS cryogel holds great potential for the treatment of DS-contaminated wastewater.

Improving gel properties of silver carp (Hypophthalmichthys molitrix) myosin with flavonols: Unveiling the advantages of isorhamnetin

This study explores the impact of flavonols (kaempferol, quercetin, kaempferitrin, and isorhamnetin) on the gel properties of myosin derived from silver carp (Hypophthalmichthys molitrix). Before employing a two-stage heating process, myosin samples are pretreated with flavonols, which enhance the structural stability of myosin and aid in the dispersion of myosin molecules. These pretreatments prepare the samples for subsequent thermal processing, where flavonols facilitate myosin unfolding and enhance intermolecular aggregation, thereby improving gel strength. This process also transforms free water within the gel to bound water, significantly increasing the water-holding capacity. Both macroscopic and microscopic rheological analyses suggest that flavonols, particularly isorhamnetin, notably enhance the elasticity and viscosity of myosin during the gelation process. Further, microstructural examinations employing techniques such as small-angle X-ray scattering and micro-computed tomography demonstrate that samples treated with flavonols develop denser and more uniform gel networks. Analytical studies reveal that flavonols, especially methylated derivatives like isorhamnetin, effectively promote gelation through strengthening hydrophobic interactions, disulfide bonds, and ionic interactions among myosin molecules. This research underscores the potential of flavonols as natural additives to enhance the quality and functional properties of surimi products, thereby elevating the processing standards of aquatic products.

Does Early-life Famine Exposure Lead to Healthy Later-life Dietary Behavior: Evidence from the Great Chinese Famine

This paper investigates the long-run effect of early-life exposure to famine on survivors’ dietary behavior. By exploiting exogenous variations in local severity of the Great Chinese Famine and variations of different cohorts, we conduct a difference-in-differences analysis. Based on detailed three-day food intake records from the China Health and Nutrition Survey, we find that famine exposure led the famine cohort who was conceived or born during the famine to adopt healthier dietary behaviors, as evidenced by a higher healthy eating score and a healthier dietary composition. Additionally, the pre-famine cohort exposed to the famine at ages 9-12 in late childhood exhibited a healthier food composition, characterized by a higher share of aquatic products. However, no statistically significant effects were observed for the pre-famine cohorts that experienced the famine in early and middle childhood. The results remain robust across various sensitivity checks. We propose that early-life famine exposure influences dietary behavior through mechanisms such as awareness of healthy eating, diet knowledge and risk aversion.

The impact of agricultural product branding on farmers’ income inequality: evidence from China

IntroductionIncome inequality is related to farmers’ welfare, access and satisfaction. Addressing income inequality among farmers is particularly urgent as it is growing. So, as an important symbol of the development of the agricultural industry, what is the impact of agricultural product branding on farmers’ income inequality?MethodsTo answer this question, this paper uses panel data from 1986 counties in China from 2000 to 2021 and employs the Recentered Influence Function (RIF) method to explore the impact of agricultural product branding (APB) on farmers’ income inequality and its mechanism of action.Results and discussionThe results of the study show that while the APB boosted farmers’ incomes by an average of 1.6%, they exacerbated farmers’ income inequality by an average of 0.4% (using the Gini coefficient as an example). Mechanistic analysis shows that the APB exacerbates farmers’ income inequality by widening the gap between counties in terms of the level of adoption of agricultural technology and agricultural labor productivity. Heterogeneity analysis reveals that, compared to non-agricultural provinces, the APB in agricultural provinces reduces interregional farmers’ income inequality. Furthermore, the APB in the grain category mitigates this inequality, whereas the APB in the cash crop and aquatic product categories exacerbates it. The APB in the livestock category, however, has no significant effect on interregional farmers’ income inequality. Considering these findings, the government should regularly assess the impact of agricultural branding policies on income inequality among farmers and adjust policies in a timely manner to ensure their effectiveness and fairness.

Radiocarbon age-offset measurements reveal shifts in the transport mechanism and age of permafrost-derived organic carbon from Burial Lake, arctic Alaska from MIS 3 to present

The stability of arctic permafrost and the carbon it contains are currently threatened by a rapidly warming climate. Burial Lake, situated in northwestern arctic Alaska, is underlain by continuous permafrost and has a uniquely rich set of paleoclimate proxy data that comprise a 40-ka record of climate and environmental change extending well into Marine Isotope Stage (MIS) 3. Here, we examine the relationship between erosion, subsurface hydrology, and primary productivity from the Burial Lake sediments to improve our understanding of the links between climate, hydrology, sediment transport, and carbon mobility. The record is developed with radiocarbon (14C) age-offsets from two independent methods used to date the lake sediments: 1) 14C measurements on paired bulk sediment and plant macrofossils from the same stratigraphic layer of lake sediment and 2) ramped pyrolysis-oxidation (RPO) 14C analysis that separates fractions of organic carbon (OC) from a single bulk sediment sample based on thermochemical differences through continuous heating. As lakes capture and archive OC transported from the watershed, changes in the amount and relative age of permafrost-derived OC mobilized during past climatic variations can be documented by examining how age-offsets change over time. The Burial Lake sediment revealed higher age-offsets during the cold Last Glacial Maximum (LGM; ∼29-17 ka) than the comparatively warmer post-glacial (∼17 ka-present) and the MIS 3 interstadial (∼40-29 ka) periods. The relatively warm, wet climate of the post-glacial period promoted both terrestrial and aquatic productivity, resulting in increased OC deposition, and it likely favored transport via subsurface flow of dissolved OC (DOC) sourced from soils. This resulted in a greater flux of contemporary OC relative to ancient OC into the lake sediment, lowering the average age offset to ∼2 ka. In contrast, the low-productivity conditions of the LGM resulted in slow soil accumulation rates, leaving ancient OC in a shallower position in the soil profile and allowing it to be easily eroded in the form of particulate OC (POC). Although the amount of total OC deposited in the lakebed during the LGM is small relative to post-glacial deposition, the majority is ancient, which leads to a relatively high average age offset of ∼9 ka. Finally, climate and environmental conditions of the MIS 3 interstadial were intermediate between those of the post-glacial and the LGM. As with post-glacial sediments, a relatively large amount of OC is present; however, the vast majority of it is ancient (more similar to the LGM), and it produces an average age offset of ∼6 ka. The Burial Lake radiocarbon record demonstrates the complexities of the thaw and mobilization of permafrost OC in arctic Alaska, including the balance between production, transport, deposition, remobilization, and preservation. This record highlights the importance of considering factors that both enhance and inhibit erosion (i.e. vegetation cover, lake level, precipitation) and the mechanisms of OC transport (i.e. subsurface flow or erosion) in predictions of future permafrost response to changes in climate.

Rapid determination of caine-based anesthetics and their metabolite residues in fish using a modified QuEChERS method coupled with UPLC-MS/MS

Caine-based anesthetics are frequently used in the production and transportation of aquatic products, but residues in fish threaten human health. A rapid, sensitive, and effective method was developed for detecting caine-based anesthetics and their metabolite residues in fish using ultra-high performance liquid chromatography-tandem mass spectrometry coupled with a modified QuEChERS (quick, easy, cheap, effective, rugged, and safe) method. The sample was extracted with 0.05 % (v/v) formic acid-80 % acetonitrile, 4 g NaCl was added for liquid partitioning, and 50 mg C18 was used for purification. Matrix-matched calibrations showed good correlation coefficients with R2 ≥ 0.9942. The limits of detection were 0.5–4.4 ng/g. The recoveries ranged from 71.4 %–115.8 %, and the relative standard deviation for intra-day and inter-day precision was less than 8.5 % and 9.2 %, respectively. This method effectively analyzed the residues of caine-based anesthetics and their metabolites in fish and could be applied to aquatic product anesthetic regulation.

Late Archaic large-scale fisheries in the wetlands of the pre-Columbian Maya Lowlands.

Multiproxy data collected from the largest inland wetland in Belize, Central America, demonstrate the presence of large-scale pre-Columbian fish-trapping facilities built by Late Archaic hunter-gatherer-fishers, which continued to be used by their Maya descendants during Formative times (approximately 2000 BCE to 200 CE). This is the earliest large-scale Archaic fish-trapping facility recorded in ancient Mesoamerica. We suggest that such landscape-scale intensification may have been a response to long-term climate disturbance recorded between 2200 and 1900 BCE. Agricultural intensification after 2000 BCE has been credited for supporting the rise of pre-Columbian civilizations in Formative Mesoamerica, but we suggest that some groups relied more heavily on the mass harvesting of aquatic resources. We argue that such early intensification of aquatic food production offered a high value subsistence strategy that was instrumental in the emergence of Formative period sedentarism and the development of complexity among pre-Columbian civilizations like the Maya.

Effect of NAA and TDZ on In Vitro Plantlet Induction of Cryptocoryne Wendtii “Brown”

The exotic aquatic plant, Cryptocoryne wendtii “Brown”, can develop into an economic crop with a continually increasing export value. Thailand is unable to produce to meet the demand. Therefore, this experiment aimed to study the optimum concentrations of growth regulators on plantlet induction. The sterile apical bud was cultured on semi-solid MS media (Murashige and Skoog, 1962) supplemented with 1-naphthaleneacetic acid (NAA) at 0, 0.1, 0.2, 0.3 mg/L and thidiazuron (TDZ) at 0, 1, 2, 3 mg/L. In the sixth week, the semi-solid MS medium which contains 0.1 mg/L NAA and 2 mg/L TDZ showed the maximum new plantlets (67.92±19.61 plantlets/explant), leaves (67.42±19.46 leaves/explant) and height (28.65±1.55 mm./plantlet), had the highest average significance (P&lt;0.05). Micropropagation of C. wendtii “Brown” in optimum culture medium could increase the volume within a shorter period and enhances the potential for quality and value-added to aquatic plant production.

Omics-Integrated Approach (Metabolomics, Proteomics and Lipidomics) to Assess the Quality Control of Aquatic and Seafood Products

Since the demand for seafood products is growing and aquaculture provides more than fifty percent of the aquatic food as reported by FAO, the development of more accurate and sensitive analytical techniques in order to screen and evaluate the safety and quality of seafood products is needed. At this point, several omic techniques like proteomics, lipidomics, and metabolomics, or combinations of them, are used for integration into seafood processing and quality control. Moreover, according to the literature, using the respective techniques can prevent, control, and treat diseases in fish as well as address several issues in aquaculture. Proteomic techniques are used for the expression of proteins and their modifications. Metabolomic techniques are used for accurate identification of species, while lipidomics techniques are used for the identification of different or specific lipid molecules in fish species, as well as fatty acid composition and location distribution. This review is to cover the recent proteomics, metabolomics, and lipidomics studies on aquatic and seafood products in the areas of quality, safety, processing, and breeding of fish.

Prediction of Shrimp Price Based on WOA-VMD-XGBoost Algorithm and SHAP Model

This research aims to construct a WOA-VMD-XGBoost-SHAP model to predict shrimp prices and analyze the nonlinear effects of key predictors. Firstly, the whale algorithm (WOA) is used to optimize the K-value and penalty parameter of the variational mode decomposition (VMD) to adaptively decompose the original price series and reduce the data noise. In addition, the trend, period, high and low frequency, and residual terms obtained from the decomposition of the original price series are used as inputs to the XGBoost model for training and testing. Finally, K-fold cross-validation and learning curves are used to test the model performance and analyze the nonlinear effects of key influencing factors in combination with the SHAP model. The results show that the Bayesian-optimized WOA-VMD-XGBoost model has excellent predictive performance with an R2 of 0.927, which is better than other benchmark models; the fluctuation of shrimp prices is cyclical, and the cyclical term accounts for 67% of the characteristic importance. The model can provide effective technical support and decision-making references for relevant management departments and enterprises to predict the price fluctuation of aquatic products.

Molecular Mechanism: Inhibition of Fusarium oxysporum T-2 Toxin Synthesis by Surfactin in Dried Fish: Induction of Yap1 Nucleation by ROS Accumulation.

(1) T-2 toxin synthesized by Fusarium oxysporum (F. oxysporum) can cause deterioration of dried fish and endanger human health. (2) The molecular mechanism by which antibacterial lipopeptides surfactin inhibited F. oxysporum growth and toxin production was elucidated by investigating the intracellular ROS production pathway and the subcellular distribution and transcriptional activity of the transcription factor Yap1 and its regulation of Tri5 gene in F. oxysporum. (3) Surfactin caused hyphal damage and nucleic acid and protein leakage; thus, the growth of F. oxysporum was disrupted. Surfactin's excessive accumulation of intracellular ROS triggered the translocation of transcription factor Yap1 into the nucleus, resulting in toxin cluster gene Tri5 expression inhibition, thereby blocking T-2 toxin synthesis. (4) This is a novel mechanism by which surfactin inhibits the growth and T-2 toxin synthesis of F. oxysporum from multiple aspects, including cell structural integrity and the ROS-Yap1 signaling pathway. (5) This study provides a theoretical basis for the application of surfactin in the antifungal control of aquatic dry products.

Lipid-involved browning mechanism during the drying process of squid

The present study evaluated lipid-involved browning mechanism during the drying process of squid. Initially, different lipid-Maillard reaction (MR) models were conducted based on the composition of squid (lipids, reducing sugars and amino acids). The degree of MR as well as α-dicarbonyl compounds (α-DCs) and lipid oxidation-mediated browning products (pyrroles and lipofuscin-like pigments) were detected. The results indicated that arginine and ribose were blamed for the browning of dried squid. Moreover, lipid oxidation provided glyoxal and methylglyoxal to participate in MR, and long-time heating and salting produced more α-DCs and accelerated browning. Meanwhile, dried squid contained hydrophilic pyrrole (17.45 μg/g lipid) and hydrophobic pyrrole (113.00 μg/g lipid), and the content of lipofuscin-like pigments increased by 1.5-fold after drying. Finally, defatting treatment demonstrated that the browning of dried squid was moderately alleviated by fat removal (L* ↑, a* ↓ and b* ↓). These findings offer a novel perspective on moderately preventing the browning of dried aquatic products.

Enhanced Detection of Vibrio harveyi Using a Dual-Composite DNAzyme-Based Biosensor.

Vibrio harveyi is a serious bacterial pathogen which can infect a wide range of marine organisms, such as marine fish, invertebrates, and shrimp, in aquaculture, causing severe losses. In addition, V. harveyi can be transmitted through food and water, infecting humans and posing a serious threat to public safety. Therefore, rapid and accurate detection of this pathogen is key for the prevention and control of related diseases. In this study, nine rounds of in vitro screening were conducted with Systematic Evolution of Ligands by Exponential Enrichment (SELEX) technology using unmodified DNA libraries, targeting the crude extracellular matrix (CEM) of V. harveyi. Two DNAzymes, named DVh1 and DVh3, with high activity and specificity were obtained. Furthermore, a fluorescent biosensor with dual DNAzymes was constructed which exhibited improved detection efficiency. The sensor showed a good fluorescence response to multiple aquatic products (i.e., fish, shrimp, and shellfish) infected with V. harveyi, with a detection limit below 11 CFU/mL. The fluorescence signal was observed within 30 min of reaction after target addition. This simple, inexpensive, highly effective, and easy to operate DNAzymes biosensor can be used for field detection of V. harveyi.

Abstract 4135338: Associations between plant-based diets and total mortality among Chinese older participants with cardiometabolic diseases: a prospective cohort study

Background and Aims: Plant-based diets have been associated with a lower risk of total mortality among generally health populations. However, the associations of plant-based diets with total mortality remain unclear among older people with cardiometabolic diseases, who have an elevated risk of mortality. Methods: We prospectively followed 4,485 participants (mean age: 84 years) from the China Prospective Longitudinal Survey of Health and Longevity (2006-2018), who had cardiometabolic disease in 2006. Dietary data were collected at baseline using a food-frequency questionnaire. Using these data, we created an overall plant-based diet index (PDI), in which plant-based foods received positive scores while animal foods (meat, fish and aquatic products, eggs, milk, animal fats) received reversed scores accordingly. We also created a healthful plant-based diet index (hPDI), where healthy plant-based foods (whole grains, vegetables, vegetable oils, fresh fruits, legumes, beans, garlic, nuts, tea) received positive scores, while less healthy plant-based foods (refined grains, pickles, sugar, preserved vegetables) and animal-based foods were given reversed scores. In addition, an unhealthful plant-based diet index (uPDI) was created by assigning positive scores to less healthy plant-based foods while reverse scores to healthy plant-based foods and animal-based foods. We used Cox proportional hazards regression to compute hazard ratios (HRs) and 95% CIs for total mortality, with adjustment for demographics, dietary and lifestyle factors, and medical history. Results: During a 12 years of follow-up, 2,881 deaths were recorded. A higher score from PDI and hPDI was associated with a lower risk total mortality among participants with cardiometabolic diseases (HR and 95% CI for extreme quintiles of PDIs: 0.85, 95% CI 0.75–0.96, P trend &lt; 0.001; hPDI: 0.84 (0.74–0.94), P trend &lt; 0.001). A higher uPDI score was associated with a higher total mortality among participants with cardiometabolic diseases (uPDI: 1.28 (1.13-1.47), P trend &lt; 0.001). These results were consistent in subgroup analyses by age, sex, smoking status, alcohol consumption, education level, physical activity, and BMI. Conclusion: Our study suggests that among older Chinese participants with cardiometabolic diseases, adherence to an overall plant-based diet or a healthful plant-based diet, is associated with a lower total mortality, while an unhealthful plant-based diet was associated with a higher total mortality.

Health risks of potentially toxic elements in Cyprinus carpio in the karst plateau lake, China.

Elevated potentially toxic elements (PTEs) in aquatic products could threaten the health of ordinary consumers. Levels of chromium (Cr), arsenic (As), lead (Pb), and mercury (Hg) in Cyprinus carpio in karst plateau freshwater Lake, Caohai Lake, China were quantified using inductively coupled plasma mass spectrometry (ICP-MS) and evaluated using a risk method with Monte Carlo simulation. Levelsof Cr, As, Pb, and Hg in muscle tissue were substantially lower than those in viscera. The maximum concentration of muscle-bound Cr, As, Pb, and Hg were less than the standard references set by Chinese Food Codex (GB 2762-2022). The levels of Cr, As, Pb, and Hg in muscle tissue were independent of fish weight and length. The hazard index of all investigated elements in muscle tissue wereless than one for adults and children, whereas the target hazard quotients of muscle-bound PTEs for children were higher than those for adults. Results indicated that exposure duration was the largest contributor to the hazard quotient of Cr, As, and Hg, whereas the concentration of Pb in muscle was the most sensitive factor affecting the variation in hazard quotient of Pb. There is no risk related to the normal intake of muscle-bound Cr, Pb, As and Hg with the consumption of Cyprinus carpio. A better definition of the probability distribution for exposure duration and PTEs concentration could result in a more accurate hazard quotient. © 2024 Society of Chemical Industry.

Water quality assessment for aquacultivation in Quang Ngai city, Quang Ngai province

Aquatic product development and growth are significantly influenced by the water supply used for aquaculture. Evaluating the water quality available for this activity is vital since Quang Ngai city has been a major hub for the growth of aquaculture in Quang Ngai province. Twelve surface water quality parameters were monitored and analyzed at eight sampling points in the river basins of An Nghia and Tinh Khe communes from May to September 2023. The Water Quality Index (WQI) was calculated, and methods including Principal Component Analysis (PCA), calculation of environmental variable weights based on principal components (PC), and Pearson correlation were used to assess the correlation of the investigated factors. In the river basin of An Nghia and Tinh Khe communes, 12 criteria for the assessment of surface water quality were tracked and examined using 8 sampling locations between May and September in 2023. The degree of linkage was assessed using principal component analysis (PCA), weighting environmental factors based on principal components (PC), and Pearson correlation. The water quality index (WQI) was calculated between the factors of the research. The findings show that: (1) The parameters exceeded the permitted limit: DO, Alkalinity, NH4+, TP, Vibrio SPP, Coliform, TOC, and TN. The two metrics with the greatest levels of pollution among them are Vibrio SPP and NH4+. The WQI index ranges from 52-74 and is within the average water quality range (51-75); (2) PCA analysis reveals that only the first two principal components, PC1 and PC2 can account for 74.39% of the variance, with NH4+ (0.089) having the highest weight; (3) NH4+ and Vibrio SPP content have a strong correlation (r = 0.95), indicating that both of these parameters can be used to evaluate water quality in the study area in general.