Aquacultural Engineering最新文献

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Dissolved oxygen prediction using regularized extreme learning machine with clustering mechanism in a black bass aquaculture pond 利用具有聚类机制的正则化极端学习机预测黑鲈养殖池塘中的溶解氧
IF 4 2区 农林科学
Aquacultural Engineering Pub Date : 2024-02-05 DOI: 10.1016/j.aquaeng.2024.102408
Pei Shi , Liang Kuang , Limin Yuan , Quan Wang , Guanghui Li , Yongming Yuan , Yonghong Zhang , Guangyan Huang
{"title":"Dissolved oxygen prediction using regularized extreme learning machine with clustering mechanism in a black bass aquaculture pond","authors":"Pei Shi ,&nbsp;Liang Kuang ,&nbsp;Limin Yuan ,&nbsp;Quan Wang ,&nbsp;Guanghui Li ,&nbsp;Yongming Yuan ,&nbsp;Yonghong Zhang ,&nbsp;Guangyan Huang","doi":"10.1016/j.aquaeng.2024.102408","DOIUrl":"10.1016/j.aquaeng.2024.102408","url":null,"abstract":"<div><p>Dissolved oxygen (DO) is an important indicator of aquaculture water quality. The prediction accuracy of DO content is the key role in managing and controlling aquaculture water quality. However, potential trends of DO under various conditions (such as weather) are always overlooked. This study aims to develop a novel DO forecasting model using the optimized regularized extreme learning machine (RELM) with factor extraction operation and <em>K</em>-medoids clustering strategy in a black bass aquaculture pond. We adopt the leave-one-out cross (LOO) error validation to obtain the optimal regularization parameter of RELM and enhance the forecasting accuracy. We further adjust the activation function to accelerate the RELM. Next, we divide the time series into day and night segments, and construct the clustering mechanism with the <em>K</em>-medoids method to extract the different patterns of data streams under various weather conditions. The experiments on 14 days’ data from a real-world aquaculture pond demonstrate the efficiency and accuracy of our proposed DO prediction model. We believe that our research will facilitate the development of a forecasting tool for warning hypoxia in the near future, which combines intelligent prediction models and real-time data.</p></div>","PeriodicalId":8120,"journal":{"name":"Aquacultural Engineering","volume":"105 ","pages":"Article 102408"},"PeriodicalIF":4.0,"publicationDate":"2024-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139876595","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Enhancing the marine antifouling property of high-density polyethylene through melt grafting of poly (hexamethylene guanidine) 通过熔融接枝聚(六甲基胍)增强高密度聚乙烯的海洋防污性能
IF 4 2区 农林科学
Aquacultural Engineering Pub Date : 2024-01-29 DOI: 10.1016/j.aquaeng.2024.102393
Jiaqi Wang , Wenwen Yu , Wenying Liu , Guofeng Wang , Jiangao Shi , Hong Wang
{"title":"Enhancing the marine antifouling property of high-density polyethylene through melt grafting of poly (hexamethylene guanidine)","authors":"Jiaqi Wang ,&nbsp;Wenwen Yu ,&nbsp;Wenying Liu ,&nbsp;Guofeng Wang ,&nbsp;Jiangao Shi ,&nbsp;Hong Wang","doi":"10.1016/j.aquaeng.2024.102393","DOIUrl":"https://doi.org/10.1016/j.aquaeng.2024.102393","url":null,"abstract":"<div><p>Acquiring environment-friendly, wide-spectrum antifouling materials is currently a significant challenge. Herein, we focused on covalently bonding poly (hexamethylene guanidine) (PHMG) to high-density polyethylene (HDPE) through a melt grafting reaction. The successful occurrence of this grafting reaction was confirmed by FT-IR analysis. Moreover, the presence of long-chain branching (LCB) was established through Cole-Cole plot, van Gurp-Palmen diagram, and dynamic thermomechanical property. This presence of LCB improved the impact strength of modified HDPE materials. An increased PHMG grafting content in the material led to a significant increase in the inhibition rate of <em>Escherichia coli</em> and <span><em>Staphylococcus aureus</em></span><span> growth, without any detectable leaching of PHMG. Furthermore, inverted fluorescence microscopy revealed a substantial inhibitory effect of the modified HDPE on diatom attachment and </span><span><em>Chlorella</em></span> sedimentation. Specifically, compared with the unmodified HDPE material, the HDPE with 2 wt% PHMG grafting showed a 79.8% decrease in the attachment rate of diatoms and a 64.5% reduction in <em>Chlorella</em> sedimentation. This research provides valuable insights into the development of eco-friendly antifouling materials with enhanced marine antifouling properties.</p></div>","PeriodicalId":8120,"journal":{"name":"Aquacultural Engineering","volume":"106 ","pages":"Article 102393"},"PeriodicalIF":4.0,"publicationDate":"2024-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139674760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Biofilter and degasser performance at different alkalinity levels in a brackish water pilot scale recirculating aquaculture system (RAS) for post-smolt Atlantic salmon 蜕皮后大西洋鲑咸水中试规模再循环水产养殖系统(RAS)在不同碱度水平下的生物过滤器和脱气机性能
IF 4 2区 农林科学
Aquacultural Engineering Pub Date : 2024-01-26 DOI: 10.1016/j.aquaeng.2024.102407
Leila Jafari , Marie Aline Montjouridès , Camilla Diesen Hosfeld , Kari Attramadal , Sveinung Fivelstad , Håkon Dahle
{"title":"Biofilter and degasser performance at different alkalinity levels in a brackish water pilot scale recirculating aquaculture system (RAS) for post-smolt Atlantic salmon","authors":"Leila Jafari ,&nbsp;Marie Aline Montjouridès ,&nbsp;Camilla Diesen Hosfeld ,&nbsp;Kari Attramadal ,&nbsp;Sveinung Fivelstad ,&nbsp;Håkon Dahle","doi":"10.1016/j.aquaeng.2024.102407","DOIUrl":"10.1016/j.aquaeng.2024.102407","url":null,"abstract":"<div><p>Maintaining pH stability in Recirculating Aquaculture Systems (RAS) is essential, as it has a direct impact on the toxicity of ammonia, CO<sub>2</sub>, and other metabolite compounds, as well as the efficiency of critical processes like nitrification and CO<sub>2</sub> removal. Alkalinity is necessary for pH stability and for the inorganic carbon supply to nitrifying bacteria. The relationship between alkalinity, nitrification rate, pH, and CO<sub>2</sub> concentration emphasize the need to determine the optimal alkalinity levels in RAS. However, the consequences of operating RAS under non-optimal alkalinity levels, especially in marine systems, are not well understood. This study aims to investigate the influence of alkalinity on nitrification rates and CO<sub>2</sub> removal efficiency in RAS with brackish water, with a specific focus on ammonia, total inorganic carbon (TIC), and CO<sub>2</sub> levels, as well as their removal rates. To accomplish this, the study was conducted in a pilot-scale Atlantic salmon post-smolt RAS. The RAS was operated with a moving bed biofilter. Alkalinity treatments of nominal 70, 100, and 200 mg/L as CaCO<sub>3</sub> were maintained by supplying sodium bicarbonate and NaOH. Each of the three treatments were operated for 2 weeks and replicated three times. During every two weeks of treatment, five water samples on days 3, 5, 8, 10, and 15 were collected. The system received 12-hour feeding of 1.5 kg/day, with continuous lighting and a water temperature and salinity of 14.2 ± 0.16<sup>◦</sup>C and 15.4 ± 0.53‰, respectively. The results indicated that high alkalinity levels (100 and 200 mg/L as CaCO<sub>3</sub>) resulted in significantly lower CO<sub>2</sub> concentrations after the water treatment, due to higher pH. The highest alkalinity treatment (200 mg/L) showed lower CO<sub>2</sub> removal efficiency. Furthermore, high alkalinity levels (above 100 mg/L as CaCO<sub>3</sub>) related to reduced total ammonia nitrogen concentrations and increased volumetric nitrite removal rate. Elevated alkalinity levels can also help prevent rapid pH fluctuations, benefiting fish health and production. To summarize, for Atlantic salmon post-smolt RAS, operated in brackish water, maintaining alkalinity slightly above 100 mg/L as CaCO<sub>3</sub> appears to be the optimal choice in terms of TAN and CO<sub>2</sub> concentration and rate of removal or consumption.</p></div>","PeriodicalId":8120,"journal":{"name":"Aquacultural Engineering","volume":"106 ","pages":"Article 102407"},"PeriodicalIF":4.0,"publicationDate":"2024-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0144860924000189/pdfft?md5=e0f77ccfc6fafa6653aadb0bc8b4d4fe&pid=1-s2.0-S0144860924000189-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139634947","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Prawn morphometrics and weight estimation from images using deep learning for landmark localization 利用深度学习进行地标定位的对虾形态计量学和图像重量估算
IF 4 2区 农林科学
Aquacultural Engineering Pub Date : 2024-01-20 DOI: 10.1016/j.aquaeng.2024.102391
Alzayat Saleh , Md Mehedi Hasan , Herman W. Raadsma , Mehar S. Khatkar , Dean R. Jerry , Mostafa Rahimi Azghadi
{"title":"Prawn morphometrics and weight estimation from images using deep learning for landmark localization","authors":"Alzayat Saleh ,&nbsp;Md Mehedi Hasan ,&nbsp;Herman W. Raadsma ,&nbsp;Mehar S. Khatkar ,&nbsp;Dean R. Jerry ,&nbsp;Mostafa Rahimi Azghadi","doi":"10.1016/j.aquaeng.2024.102391","DOIUrl":"https://doi.org/10.1016/j.aquaeng.2024.102391","url":null,"abstract":"<div><p>Accurate morphometric analyses and weight estimation are useful in aquaculture for optimizing feeding, predicting harvest yields, identifying desirable traits for selective breeding, grading processes, and monitoring the health status of production animals. However, the collection of phenotypic data through traditional manual approaches at industrial scales and in real-time is time-consuming, labour-intensive, and prone to errors. Digital imaging of individuals and subsequent training of prediction models using Deep Learning (DL) has the potential to rapidly and accurately acquire phenotypic data from aquaculture species. In this study, we applied a novel DL approach to automate morphometric analysis and weight estimation using the black tiger prawn (Penaeus monodon) as a model crustacean. The DL approach comprises two main components: a feature extraction module that efficiently combines low-level and high-level features using the Kronecker product operation; followed by a landmark localization module that then uses these features to predict the coordinates of key morphological points (landmarks) on the prawn body. Once these landmarks were extracted, weight was estimated using a weight regression module based on the extracted landmarks using a fully connected network. For morphometric analyses, we utilized the detected landmarks to derive five important prawn traits. Principal Component Analysis (PCA) was also used to identify landmark-derived distances, which were found to be highly correlated with shape features such as body length, and width. We evaluated our approach on a large dataset of 8164 images of the Black tiger prawn (Penaeus monodon) collected from Australian farms. Our experimental results demonstrate that the novel DL approach outperforms existing DL methods in terms of accuracy, robustness, and efficiency.</p></div>","PeriodicalId":8120,"journal":{"name":"Aquacultural Engineering","volume":"106 ","pages":"Article 102391"},"PeriodicalIF":4.0,"publicationDate":"2024-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0144860924000025/pdfft?md5=3c4c05c726036ab91fb282cccf2898b0&pid=1-s2.0-S0144860924000025-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139653708","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Numerical and experimental study of two common types of fouled net panels in the ocean 海洋中两种常见污损网板的数值和实验研究
IF 4 2区 农林科学
Aquacultural Engineering Pub Date : 2024-01-20 DOI: 10.1016/j.aquaeng.2024.102394
Peng Li , Fangyu Gong , Hongde Qin , Songchen Yu
{"title":"Numerical and experimental study of two common types of fouled net panels in the ocean","authors":"Peng Li ,&nbsp;Fangyu Gong ,&nbsp;Hongde Qin ,&nbsp;Songchen Yu","doi":"10.1016/j.aquaeng.2024.102394","DOIUrl":"10.1016/j.aquaeng.2024.102394","url":null,"abstract":"<div><p>In this paper, the hydrodynamic and surrounding flow field characteristics of fouled nets panel are studied based on numerical and experimental methods. The types of fouled nets panel are analyzed and be divided into shell aggregation fouled net and bio-accumulation fouled net according to the attachment location and morphological characteristics of contaminants. Physical models of each type of fouled nets panel are made manually for water tank experiments. The corresponding numerical simplified model was established using the large eddy simulation method for flow field simulation to calculate and analyze the hydrodynamics of the net, capture the subtle changes in the flow field caused by pollutants, quantify and analyze the permeability of each hydroid-fouled nets.</p></div>","PeriodicalId":8120,"journal":{"name":"Aquacultural Engineering","volume":"106 ","pages":"Article 102394"},"PeriodicalIF":4.0,"publicationDate":"2024-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139540165","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Numerical study on hydrodynamic behaviors of and flow field around UHMWPE plane nets 超高分子量聚乙烯平面网流体力学行为及周围流场的数值研究
IF 4 2区 农林科学
Aquacultural Engineering Pub Date : 2024-01-17 DOI: 10.1016/j.aquaeng.2024.102397
Haisheng Zhao , Yiyang Hu , Chunwei Bi , Xin Li
{"title":"Numerical study on hydrodynamic behaviors of and flow field around UHMWPE plane nets","authors":"Haisheng Zhao ,&nbsp;Yiyang Hu ,&nbsp;Chunwei Bi ,&nbsp;Xin Li","doi":"10.1016/j.aquaeng.2024.102397","DOIUrl":"https://doi.org/10.1016/j.aquaeng.2024.102397","url":null,"abstract":"<div><p>The hydrodynamic behaviors of and flow field around the net made by ultra-high molecular weight polyethylene (UHMWPE) were seldom investigated previously. Therefore, a three-dimensional numerical model for the UHMWPE plane net is established herein based on the porous media model, and the unknown Darcy-Forchheimer coefficients are attained by fitting the experimental data of physical model with the minimum error function method. Then, the flow field characteristics around the UHMWPE plane net are investigated and it is noted that the flow velocity reduction along the horizontal centerline of net decreases with the increase in velocity, while larger attack angle and solidity both result in a larger flow velocity reduction. And, the effects of nets spacing and number on the velocity distribution and flow field properties in and around multi-layer nets are revealed. Finally, the empirical formulas for calculating the drag and lift coefficients of the UHMWPE plane net are proposed by considering as the function of solidity, Reynolds number and attack angle.</p></div>","PeriodicalId":8120,"journal":{"name":"Aquacultural Engineering","volume":"106 ","pages":"Article 102397"},"PeriodicalIF":4.0,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139505387","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Hydrodynamics of waste collection in a recirculating aquaculture tank with different flow-guide discs 使用不同导流盘的循环水产养殖池中废物收集的流体力学
IF 4 2区 农林科学
Aquacultural Engineering Pub Date : 2024-01-17 DOI: 10.1016/j.aquaeng.2024.102395
Jun Zhang , Ning Zhang , Minghua Wang , Congcong Chen , Yang Gao , Shouqi Cao , Xingguo Liu , Qinsong Hu , Zheng Zhang
{"title":"Hydrodynamics of waste collection in a recirculating aquaculture tank with different flow-guide discs","authors":"Jun Zhang ,&nbsp;Ning Zhang ,&nbsp;Minghua Wang ,&nbsp;Congcong Chen ,&nbsp;Yang Gao ,&nbsp;Shouqi Cao ,&nbsp;Xingguo Liu ,&nbsp;Qinsong Hu ,&nbsp;Zheng Zhang","doi":"10.1016/j.aquaeng.2024.102395","DOIUrl":"10.1016/j.aquaeng.2024.102395","url":null,"abstract":"<div><p><span>To improve the efficiency of waste collection in recirculating aquaculture tanks (RATs), this study proposed a dual-channel RAT with flow-guide discs on the overflow pipe close to the bottom. First, an experimental verification system was designed, and the validity of the two-phase flow model was verified by comparing the experimental results. Then, the liquid</span><img>solid flow characteristics were analysed by comparing the velocity distribution, particle trajectory, retention time and removal rate. Finally, the influences of the parameters of the flow-guide discs on the particle agglomeration effect were obtained by comparing the discharge rate of particles under different hydraulic retention times (HRTs). The results indicate that the flow-guide disc weakens local reflux, reduces the overcurrent area and the low-speed vortex area at the bottom of the tank, and thus shortens the residence time for particulate matters. As the diameter of the flow-guide disc increases within a certain range, the flow velocity gradient and eddy intensity near the disc will increase, resulting in a shorter residence time for particles. Furthermore, as the height of the flow-guide disc to the bottom of the tank decreases, the flow velocity below it accelerates, which is beneficial for improving the discharge rate of particulate matter. However, when the height of the flow-guide disc increases to a certain extent, the influences on the hydrodynamics of waste collection become weaker.</p></div>","PeriodicalId":8120,"journal":{"name":"Aquacultural Engineering","volume":"106 ","pages":"Article 102395"},"PeriodicalIF":4.0,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139539926","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effects of scaled-down dissolved air flotation system on suspended solids removal from Penaeus vannamei culture under biofloc conditions 按比例缩小的溶气浮选系统对在生物絮凝条件下去除万年青中悬浮固体的影响
IF 4 2区 农林科学
Aquacultural Engineering Pub Date : 2024-01-15 DOI: 10.1016/j.aquaeng.2024.102396
Helena Lopes Galasso , Marco Shizuo Owatari , Luis Alejandro Vinatea Arana , Katt Regina Lapa
{"title":"Effects of scaled-down dissolved air flotation system on suspended solids removal from Penaeus vannamei culture under biofloc conditions","authors":"Helena Lopes Galasso ,&nbsp;Marco Shizuo Owatari ,&nbsp;Luis Alejandro Vinatea Arana ,&nbsp;Katt Regina Lapa","doi":"10.1016/j.aquaeng.2024.102396","DOIUrl":"https://doi.org/10.1016/j.aquaeng.2024.102396","url":null,"abstract":"<div><p>Suspended solids removal is a fundamental procedure for improving water quality in super-intensive rearing of Pacific white shrimp <em>Penaeus vannamei</em> under biofloc conditions. The aim of this research was to evaluate a dissolved air flotation (DAF) model for removing total suspended solids in a biofloc system for <em>P. vannamei</em> with zero water exchange. The experiment was carried out using a pilot model, with which different combinations of saturation pressures (4.0, 4.5 and 5.0 bar) and recirculation rates (10%, 15% and 20%) were evaluated, totaling nine treatments. The removal rates were calculated for the variables total organic carbon dissolved, biochemical oxygen demand, phosphate, nitrate, nitrite, total suspended solids, and turbidity. The use of DAF for the removal of suspended solids was feasible reaching 60% removal. In addition, great potential was found in other variables removal, such as turbidity and biochemical oxygen demand, with an average removal of 80% and 50%, respectively. Moreover, alkalinity, pH, temperature and salinity remained unchanged, remaining under ideal conditions for <em>P. vannamei</em> under biofloc conditions. Flotation velocity ranged from 2.99 to 11.74 cm min<sup>−1</sup> and air/solids ratio ranged from 0.005 to 0.016 mg air mg solids<sup>−1</sup>. Considering all water quality parameters analyzed, dissolved air flotation presented better performance with saturation pressure above 4.5 bar and recirculation rate above 15%.</p></div>","PeriodicalId":8120,"journal":{"name":"Aquacultural Engineering","volume":"104 ","pages":"Article 102396"},"PeriodicalIF":4.0,"publicationDate":"2024-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0144860924000074/pdfft?md5=cd20be9c7facc3ec80c9c935c8946b09&pid=1-s2.0-S0144860924000074-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139487720","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Hydrogen sulphide dynamics in recirculating aquaculture systems with moving or fixed bed biofilters: A case study in two commercial salmon smolt producing farms in Norway 使用移动或固定床生物过滤器的循环水产养殖系统中的硫化氢动态:挪威两个商业鲑鱼幼鱼养殖场的案例研究
IF 4 2区 农林科学
Aquacultural Engineering Pub Date : 2024-01-15 DOI: 10.1016/j.aquaeng.2024.102392
Paulo Mira Fernandes , Endre Steigum, Erik Höglund, Paula Rojas-Tirado, Åse Åtland
{"title":"Hydrogen sulphide dynamics in recirculating aquaculture systems with moving or fixed bed biofilters: A case study in two commercial salmon smolt producing farms in Norway","authors":"Paulo Mira Fernandes ,&nbsp;Endre Steigum,&nbsp;Erik Höglund,&nbsp;Paula Rojas-Tirado,&nbsp;Åse Åtland","doi":"10.1016/j.aquaeng.2024.102392","DOIUrl":"https://doi.org/10.1016/j.aquaeng.2024.102392","url":null,"abstract":"<div><p>Sudden mass mortalities of fish reared in recirculating aquaculture systems (RAS) have occurred in recent years. High total dissolved sulphide (H<sub>2</sub>S + HS<sup>-</sup> + S<sup>2-</sup>) levels in the rearing water have been suggested as an underlaying factor for such mass mortalities. However, limited information is available regarding H<sub>2</sub>S dynamics in commercial aquaculture production facilities. In this case study, we present H<sub>2</sub>S dynamics in the rearing water of two commercial salmon post-smolt (150–250 g) RAS facilities equipped with different biofilters: one RAS with fixed bed biofilters (fRAS) and the other RAS with moving bed biofilters (mRAS). The farms operated at different water exchange rates and cumulative feed load but were otherwise comparable in terms of biomass and feed loading throughout the monitoring period. Self-calibrating, automatic gas-phase H<sub>2</sub>S sensors were installed at three locations per farm: after the fish tanks, after the biofilters and after the degassers and operated for a period of approximately 70 days in both farms. H<sub>2</sub>S was observed at maximum daily average of 0.6 µg/L in all locations monitored in the two RAS facilities and no significant fish mortality was reported during the monitoring period. In the fRAS, H<sub>2</sub>S concentration dynamics showed that there was a net concentration increase after the fish tanks and after the biofilters, and a net concentration decrease after the degassers. Furthermore, in the fRAS, backwashing of fixed bed biofilter chambers caused a slight increase in H<sub>2</sub>S after the biofilters. In the mRAS, there was a net positive increase in H<sub>2</sub>S after the fish tanks, and a net concentration decrease after the biofilters and degassers. Moreover, generally, H<sub>2</sub>S concentration in RAS seemed to be unrelated to feeding or fish biomass. Thus, this study suggests that the main contributing factors to H<sub>2</sub>S dynamics in RAS are biofilter design, system, and tank water exchange rates and, and potentially aeration and turbulence within each compartment.</p></div>","PeriodicalId":8120,"journal":{"name":"Aquacultural Engineering","volume":"104 ","pages":"Article 102392"},"PeriodicalIF":4.0,"publicationDate":"2024-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0144860924000037/pdfft?md5=4f50ce6fe055621f82a2e854e8ceb198&pid=1-s2.0-S0144860924000037-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139487721","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Innovative aquaculture cage “Flow2Vortex” ensures a sustainable biomass delivery for low trophic level aquaculture 创新型水产养殖网箱 "Flow2Vortex "确保低营养级水产养殖的可持续生物量输送
IF 4 2区 农林科学
Aquacultural Engineering Pub Date : 2024-01-04 DOI: 10.1016/j.aquaeng.2024.102390
Jamileh Javidpour , Ralf Schwarz , Sonia K.M. Gueroun , Carlos A.P. Andrade , João Canning-Clode
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