Aquacultural Engineering最新文献

{"title":"Impact of the biological fouling on the hydrodynamic characteristics of nets under different current and attack angle conditions","authors":"Songchen Yu ,&nbsp;Hongde Qin ,&nbsp;Peng Li ,&nbsp;Fangyu Gong","doi":"10.1016/j.aquaeng.2024.102416","DOIUrl":"https://doi.org/10.1016/j.aquaeng.2024.102416","url":null,"abstract":"<div><p>The impact of biological fouling on the hydrodynamic performance of nets is examined in this paper. Since the safety and reliability of the net are threatened by biological fouling, particularly in the context of drag forces and flow characteristics. The drag forces exerted on clean nets and those affected by biological fouling under different attack angles (90° and 45°) are compared. The results highlight that biological fouling increases drag significantly, with 26.2 % to 65.8 % higher drag compared to clean nets within specific solidity ranges. As such, traditional drag coefficient formulas may not accurately predict the drag for biofouling nets. Aside from this, it is found that biological fouling enhances the shielding effect behind net twines, particularly at the 45° attack angle. Notably, significant velocity attenuation and fluctuation behind the aperture center of biofouling nets are observed, especially at the 45° attack angle. Furthermore, how the attack angle affects the vorticity field of biofouling nets on different characteristic planes are also assessed in this paper, aiming to provide insights into understanding how biological fouling alters the flow dynamics around the net structure, potentially affecting its performance and susceptibility to excitations such as currents/waves.</p></div>","PeriodicalId":8120,"journal":{"name":"Aquacultural Engineering","volume":"106 ","pages":"Article 102416"},"PeriodicalIF":4.0,"publicationDate":"2024-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140638439","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}

{"title":"MusselCF, a user-friendly toolbox to estimate the physiological carbon footprint of mussels in suspended aquaculture","authors":"Manuel Pájaro ,&nbsp;Isabel Fuentes-Santos ,&nbsp;Uxío Labarta ,&nbsp;Antonio A. Alonso ,&nbsp;X. Antón Álvarez-Salgado","doi":"10.1016/j.aquaeng.2024.102415","DOIUrl":"https://doi.org/10.1016/j.aquaeng.2024.102415","url":null,"abstract":"<div><p>Interest on the potential CO₂ sequestration of marine bivalve aquaculture has increased during the last decade. However, there is still some controversy about which biological processes are involved and how to estimate their contribution to the carbon footprint of bivalve aquaculture. This work considers the dissolved inorganic carbon, CO₂ and alkalinity fluxes linked to flesh and shell growth, calcification, respiration, faeces egestion, and ammonia excretion, accounting also for the RDOC production associated to these processes. We have developed an algorithm for a dynamic estimation of these fluxes based on a net production DEB growth model for mussels. The resulting model has been implemented in Python to create a toolbox with a graphical user interface. This toolbox allows the selection of different culture strategies, in terms of seeding date, seed size and culture length, and consequently analyzes the carbon footprint and impact on the carbonate chemistry of seawater of aquaculture management.</p></div>","PeriodicalId":8120,"journal":{"name":"Aquacultural Engineering","volume":"105 ","pages":"Article 102415"},"PeriodicalIF":4.0,"publicationDate":"2024-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0144860924000268/pdfft?md5=b83841f2b18418e26d5c2fc89da06354&pid=1-s2.0-S0144860924000268-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140555263","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}

{"title":"Transitioning from wild seed fishery to Seed Mussel Collectors (SMCs): Reviewing the efficiency of collectors for seed provisioning in mussel bottom culture","authors":"Wouter van Broekhoven ,&nbsp;Marnix R. van Stralen ,&nbsp;Karin Troost ,&nbsp;Jacob J. Capelle","doi":"10.1016/j.aquaeng.2024.102414","DOIUrl":"10.1016/j.aquaeng.2024.102414","url":null,"abstract":"<div><p>The availability of mussel seed is a critical aspect in mussel farming. Since 2009, the Dutch mussel sector has been transitioning from wild seed fishery to suspended seed collectors (Seed Mussel Collectors, or SMCs). Collector systems using either ropes or nets as settlement substrate are placed in Oosterschelde Bay, the Wadden Sea, and the North Sea annually. We analyzed detailed harvest data from 2010 until 2022, to investigate the efficiency of different systems, identify differences between years and areas, and assess how production can be optimized. Additionally, numerical density, biomass, and shell lengths of mussels from 0.375 mm shell length were recorded on SMC ropes at one SMC location during a full growth season to evaluate biomass-density relations and assess the process of self-thinning on the ropes. Total harvest of SMC mussel seed increased over the period 2010–2022, from 8.0 ×10⁶ kg to 21.0 ×10⁶ kg fresh weight. Harvest per unit substrate was remarkably stable over the years across sites, with a lower mean in Oosterschelde Bay (∼2.56 kg m⁻¹) than in the Wadden Sea (∼3.28 kg m⁻¹). Ropes were found to provide a greater yield per unit area than nets, but nets are less labor-intensive to use. Occurrence of density-dependent growth on the ropes was indicated by the allometric relation between mussel biomass and mussel density. A positive relation between density and growth rate suggested that competition increased with growth rate. In the growth data covering a full SMC season, we first observed a rapid numerical increase as newly settled mussels continued to grow into the measured size range. This was followed by a period of rapid numerical reduction and increasing biomass, indicating self-thinning. Finally numerical reduction stabilized and biomass increase accelerated coupled with comparatively slower shell length increase. The self-thinning occurred between approximately 2.3 mm and 11.6 mm mean shell length. Our analysis of 12 years of production data shows that SMC seed is a robust and annually more reliable alternative to wild capture fishery as a seed provisioning resource for mussel culture. Production per unit substrate does not appear to be easily amenable to further improvement. Production per unit area showed no indication of overstocking on the scale of the SMC plots, suggesting that production gains could be made by increasing substrate density.</p></div>","PeriodicalId":8120,"journal":{"name":"Aquacultural Engineering","volume":"105 ","pages":"Article 102414"},"PeriodicalIF":4.0,"publicationDate":"2024-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0144860924000256/pdfft?md5=505fafc8e090068a181ed8aa4d8c7815&pid=1-s2.0-S0144860924000256-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140398888","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}

{"title":"Design, deployment, and operation of an experimental offshore seaweed cultivation structure","authors":"Zachary Moscicki ,&nbsp;M. Robinson Swift ,&nbsp;Tobias Dewhurst ,&nbsp;Michael MacNicoll ,&nbsp;Michael Chambers ,&nbsp;Igor Tsukrov ,&nbsp;David W. Fredriksson ,&nbsp;Peter Lynn ,&nbsp;Melissa E. Landon ,&nbsp;Beth Zotter ,&nbsp;Noah MacAdam","doi":"10.1016/j.aquaeng.2024.102413","DOIUrl":"10.1016/j.aquaeng.2024.102413","url":null,"abstract":"<div><p>Seaweed cultivation systems suitable for offshore and exposed locations have the potential to enable expansion of global seaweed production to levels capable of substantially supplementing or offsetting terrestrial agriculture. A demonstration scale, experimental seaweed cultivation system (farm) intended to withstand exposed ocean environments was designed, deployed, planted with kelp (a type of seaweed), monitored and decommissioned. Objectives for the field program included: [1] observation of the farm’s behavior and survivability in exposed ocean conditions, [2] demonstration of novel farm system design features and component technologies, and [3] evaluation of farm operability. Novel design features included a lattice mooring system geometry, multi-shaft helical anchors, and the use of fiberglass rod as a replacement for rope anchor lines and kelp growth substrate in order to mitigate the risk of marine animal entanglement. New hardware was developed for transmitting tension loads to and from fiberglass rods, enabling their use in the farm. A numerical model was used in the design stage to simulate the farm in ocean conditions. Analysis results were used to specify farm components, evaluate sensitivities to installation precision, identify potential issues with component interaction, consider operational constraints and investigate the implications of single point failures. The farm was installed at a Gulf of Maine, USA site and planted with <em>Saccharina latissima</em> (sugar kelp) in November 2021 through January 2022 and monitored for one growth season. Kelp was sampled 3 times and met-ocean conditions were measured throughout the season. Kelp was harvested in May 2022 and the structure was removed June 2022. Recovered components were inspected for wear. The farm survived a series of storm events with significant wave heights greater than 2 m and at least one storm with a maximum wave height of 5.9 m. The farm system experienced only minor corrosion, wear and damage. Farm operations revealed the need for improved accessibility, tension control and anchor placement accuracy. Observations and tests revealed relatively poor kelp holdfast attachment to the fiberglass rope replacement. Nonetheless, demonstration results suggest that the experimental farming system design was suitable for use in exposed settings.</p></div>","PeriodicalId":8120,"journal":{"name":"Aquacultural Engineering","volume":"105 ","pages":"Article 102413"},"PeriodicalIF":4.0,"publicationDate":"2024-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0144860924000244/pdfft?md5=06e6ee5fba89102007a0f23683bd044c&pid=1-s2.0-S0144860924000244-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140406424","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}

{"title":"Dynamic responses of a semi-submersible integrated wind-energy-aquaculture structure under regular and irregular waves","authors":"Zhen-Qiang Jiang ,&nbsp;Chun-Wei Bi ,&nbsp;Lian-Xin Xin","doi":"10.1016/j.aquaeng.2024.102412","DOIUrl":"https://doi.org/10.1016/j.aquaeng.2024.102412","url":null,"abstract":"<div><p>Offshore aquaculture has expanded significantly, and offshore wind energy is more abundant and stable than it is on land. The integration of aquaculture facilities and offshore wind-turbine technology to build a comprehensive platform has both scientific and theoretical significance. To further investigate an integrated wind-energy and aquaculture structure and its dynamic response characteristics, we performed physical model experiments to investigate the motion response properties of the new wind-energy-aquaculture integrated structure. Regular and irregular wave experiments were conducted on a wave flume. The motion responses and mooring line tensions of the platform modules were obtained. Under regular wave conditions, the three degree-of-freedom motion response of the model under two different mooring configurations exhibit the similar trend as the wave height and wave frequency increased. The heave responses under different mooring configurations were generally consistent, whereas the surge responses exhibited low-frequency characteristics. The mooring line tensions of the taut mooring configuration changed significantly with the wave parameters, whereas those with catenary mooring exhibited minor changes. Under irregular wave conditions, structures with catenary mooring systems exhibited smaller motion responses, thereby maintaining their stability.</p></div>","PeriodicalId":8120,"journal":{"name":"Aquacultural Engineering","volume":"106 ","pages":"Article 102412"},"PeriodicalIF":4.0,"publicationDate":"2024-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140327713","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}

{"title":"Powering aquaculture operations at sea: Can hydrogen be a sustainable solution?","authors":"Marios Charalambides ,&nbsp;Michalis Menicou ,&nbsp;Nicolas Aristokleous","doi":"10.1016/j.aquaeng.2024.102411","DOIUrl":"https://doi.org/10.1016/j.aquaeng.2024.102411","url":null,"abstract":"<div><p>Marine aquaculture has experienced robust growth in recent years, emerging as one of the fastest-growing industries globally. While coastal aquaculture is the prevailing form, it has caused conflicts among stakeholders due to limited near-coast areas and associated environmental issues. The imperative for increased seafood production, coupled with these challenges, has spurred a growing trend for the industry to venture further away from the coast. However, sustainable and competitive offshore economic activity encounters numerous challenges, with a critical one being the provision of uninterrupted energy far from the coast. This paper aims to provide a concise overview of the energy requirements of an offshore aquaculture farm, review current energy supply solutions, and explore a potentially new solution involving the use of hydrogen as the primary fuel.</p></div>","PeriodicalId":8120,"journal":{"name":"Aquacultural Engineering","volume":"105 ","pages":"Article 102411"},"PeriodicalIF":4.0,"publicationDate":"2024-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140187500","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}

{"title":"Performance evaluation and mathematical model of pipeline diffused aeration for recirculating aquaculture system","authors":"Mingdong Ji ,&nbsp;Zhangying Ye ,&nbsp;Haijun Li","doi":"10.1016/j.aquaeng.2024.102410","DOIUrl":"https://doi.org/10.1016/j.aquaeng.2024.102410","url":null,"abstract":"<div><p>High requirement of aerating to increase dissolved oxygen is essential for improving the level of intensive recirculating aquaculture system (RAS). A simple, low-cost and maintainable pipeline diffused aeration (PDA) was proposed and designed for pure oxygen to increase the dissolved oxygen. It mainly consists of a diffused aeration stone, a union tee and an interior plug joint. The aim of this article was to study effects of oxygen flow rate (<em>OFR</em>) or inlet dissolved oxygen (<em>IDO</em>) combined with pipe length (<em>PL</em>) on PDA performance, and to construct a referable mathematical model of outlet dissolved oxygen (<em>ODO</em>) with <em>IDO</em> and gas-liquid contact time (<em>CT</em>) for actual recirculating aquaculture water. Results indicated that the oxygen increment rate and the oxygen utilization rate increased with the increase of <em>PL</em> for tap water, and that increased with the decrease of <em>IDO</em> for actual recirculating aquaculture water. PDA is mainly influenced by <em>PL</em> and thus suitably applied in the treated circulating water back flow to culture ponds, especially for RAS with long pipelines. Under the experimental conditions with <em>OFR</em> of 3 L/min, <em>IDO</em> of 3.92 mg/L, and <em>PL</em> of 10 m, the best oxygen increment rate was 149.02% and the best oxygen utilization rate was 11.60%. The linearly mathematical model of <em>ODO</em>=3.8464+0.6237*<em>IDO</em>+0.2705*<em>CT</em> (<em>R</em>²=0.97) can be referred to develop a controllable PDA system for predicting or regulating the dissolved oxygen of water in culture ponds. In particular, PDA combined with liquid oxygen supply will be further studied to promote its application in RAS.</p></div>","PeriodicalId":8120,"journal":{"name":"Aquacultural Engineering","volume":"105 ","pages":"Article 102410"},"PeriodicalIF":4.0,"publicationDate":"2024-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139985880","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}

{"title":"Vision-based dual network using spatial-temporal geometric features for effective resolution of fish behavior recognition with fish overlap","authors":"Haixiang Zhao ,&nbsp;Yuankai Wu ,&nbsp;Keming Qu ,&nbsp;Zhengguo Cui ,&nbsp;Jianxin Zhu ,&nbsp;Hao Li ,&nbsp;Hongwu Cui","doi":"10.1016/j.aquaeng.2024.102409","DOIUrl":"https://doi.org/10.1016/j.aquaeng.2024.102409","url":null,"abstract":"<div><p>In this study, a novel visualization framework for fish behavior recognition based on Slowfast networks and spatial-temporal graph convolutional networks (ST-GCN) is proposed. The framework can directly recognize fish behaviors in continuous videos and classify fish states in cases of severe fish stacking. A self-constructed fish behavior dataset containing 10 single fish HD videos and 300 fish schooling video clips covering three action categories and two state categories was collected. The evaluation was performed on this behavioral dataset. The results show that the framework achieves accuracies of 95.00% and 88.61% for state recognition and action recognition, respectively, exceeding those of several benchmark methods. Robustness and generalization experiments, as well as fish feeding experiments, were also conducted to demonstrate the potential application of the framework for guiding smart feeding in real production activities. The framework provides a novel solution for fish behavior analysis in the visual domain and can be extended to other aquatic animals or scenarios.</p></div>","PeriodicalId":8120,"journal":{"name":"Aquacultural Engineering","volume":"105 ","pages":"Article 102409"},"PeriodicalIF":4.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139744196","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}

{"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}

{"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}