Aquacultural Engineering最新文献

{"title":"Precise feeding technology for outdoor pond aquaculture based on detection and counting method","authors":"Zhongpei Wang ,&nbsp;Rong Qian ,&nbsp;Haoran Deng ,&nbsp;Lele Zhou ,&nbsp;Jun Ling","doi":"10.1016/j.aquaeng.2025.102588","DOIUrl":"10.1016/j.aquaeng.2025.102588","url":null,"abstract":"<div><div>In aquaculture, both overfeeding and underfeeding pose significant challenges. Underfeeding impedes fish growth, while overfeeding leads to feed waste, increased costs, and water pollution, ultimately compromising fish health. Precise feeding strategies are thus critical for sustainable aquaculture. Existing feeding technologies are primarily limited to indoor environments and specific fish species. Our study aims to extend the research scope to outdoor natural environments, applicable across diverse fish species. We start from the basic biological characteristics of fish, that is, fish will feed when they are hungry, to evaluate fish feeding behavior. We use object detection and counting technology to measure fish appetite by dynamic changes in feeding fish populations. The feeding strategy proposed is more refined and can continuously reflect the changes in the feeding intensity of the fish school. Considering the real-time needs of the application scenario, we select the YOLOv8 object detection algorithm as the basic algorithm. In view of the complexity of natural scenes—where targets are often small and feature-poor—we enhance the YOLOv8 algorithm with a Star operation, CAA module, and DyHead mechanism. The resulting YOLOv8-FishDetect model achieves significant performance gains, improving precision by 3.30 %, [email protected] by 2.51 %, and [email protected]–0.95 by 4.28 % over baseline YOLOv8. This work can provide a scalable solution for outdoor precision feeding, advancing sustainable aquaculture practices.</div></div>","PeriodicalId":8120,"journal":{"name":"Aquacultural Engineering","volume":"111 ","pages":"Article 102588"},"PeriodicalIF":3.6,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144471651","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":"Carbon dot-graphene composite: A novel biocide for marine biofouling control in aquaculture cage nets","authors":"P.Muhamed Ashraf,&nbsp;V.A. Sahla,&nbsp;C.S. Anjana,&nbsp;P.K. Binsi","doi":"10.1016/j.aquaeng.2025.102586","DOIUrl":"10.1016/j.aquaeng.2025.102586","url":null,"abstract":"<div><div>Recently, heightened concern and reluctance among planners and fishers about using inorganic biocides in aquatic systems have increased the importance of carbon-based nanomaterials, which are free from metallic contaminants and non-toxic to the environment and biota. The study aimed to synthesize carbon dot (CD) from fish eye and to fabricate a CD-graphene composite to test its efficacy as biocide against marine biofouling. The organic components of fish eyes were hydrothermally transformed into fluorescent nano carbon dots as evidenced by their FTIR signatures, fluorescence and UV-Visible spectra. The fish eye CD-graphene composite synthesized hydrothermally and was studied for its chemical and morphological characteristics. A nano-sized CD-graphene composite is formed with a few disorganized layers exhibiting an amorphous nature. Different concentrations of CD-graphene were coated onto surface-modified polyethylene aquaculture cage nets using polyaniline and exposed to the marine environment for 8 months to evaluate the composite's effectiveness as an antifouling agent. The treated cage net exhibited excellent biofouling resistance and the optimum concentration of CD-graphene for efficient resistance was 0.02 %. The study attributed the biocidal mechanism of the composites to the synergistic activity of CDs and graphene under sunlight, which generates ROS and free radical species. This process disrupts microbial biofilm formation on cage nets, leading to enhanced biofouling resistance.</div></div><div><h3>Synopsis</h3><div>The synthesized fish eye waste derived carbon dot-graphene composite, offers a non-toxic, metal-free antifouling solution for aquaculture systems, effectively reducing marine biofouling through sunlight-driven reactive oxygen species and free radical generation.</div></div>","PeriodicalId":8120,"journal":{"name":"Aquacultural Engineering","volume":"111 ","pages":"Article 102586"},"PeriodicalIF":3.6,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144312764","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":"Experimental study on the hydrodynamic responses of a novel platform integrating vertical-axis wind turbine with a fish cage in regular waves","authors":"Chun-Wei Bi ,&nbsp;Yuan-Mao Zhang ,&nbsp;Chao Ma ,&nbsp;Sen-Qi Cui","doi":"10.1016/j.aquaeng.2025.102585","DOIUrl":"10.1016/j.aquaeng.2025.102585","url":null,"abstract":"<div><div>An offshore wind energy–aquaculture integrated platform, combining a floating vertical-axis wind turbine with a fish cage (VAWT-FC), is proposed in this study. To investigate its hydrodynamic response characteristics, laboratory experiments were conducted using a 1:100 scale physical model. Regular wave tests were performed to analyze the platform's behavior under various wave heights and periods. The results show that the heave, surge, pitch motions, and mooring line tension all increased with wave height. For instance, as the wave height increased from 3 cm to 12 cm, pitch motion increased from 3.17° to 11.70°, and mooring tension increased by 229 %. With increasing wave period, surge and heave initially decreased and then increased, while pitch showed the opposite trend. A critical inflection point was observed at a wave period of 0.8 s, where the pitch amplitude peaked and both surge and heave reached minimum values—corresponding to a wavelength approximately equal to the platform’s 0.851 m span. Furthermore, wave overtopping was found to occur in two distinct stages as wave height increased and in three stages as wavelength increased. In contrast, wave breaking was observed to evolve through two phases under the influence of both increasing wave height and wavelength. The findings offer valuable insights for the development and optimization of multi-functional offshore platforms integrating renewable energy and aquaculture.</div></div>","PeriodicalId":8120,"journal":{"name":"Aquacultural Engineering","volume":"111 ","pages":"Article 102585"},"PeriodicalIF":3.6,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144280073","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":"Design considerations for a continuous mussel farm in New England Offshore waters. Part II: Using validated numerical models to estimate the probability of failure","authors":"Richards C. Sunny ,&nbsp;David W. Fredriksson ,&nbsp;Igor Tsukrov ,&nbsp;Longhuan Zhu ,&nbsp;Matthew Bowden ,&nbsp;Michael Chambers ,&nbsp;Bill Silkes","doi":"10.1016/j.aquaeng.2025.102575","DOIUrl":"10.1016/j.aquaeng.2025.102575","url":null,"abstract":"<div><div>In response to stakeholder conflicts, coastal pollution, and spatial constraints limiting sustainable nearshore aquaculture, offshore farms have emerged as a potential solution. However, offshore farms are exposed to energetic wave–current conditions and require a rigorous engineering approach to reduce failure risk. This paper presents a methodology to evaluate the risk of structural failure of offshore mussel farms in response to extreme wave and current conditions using a representative mussel farm design in New England offshore waters. This includes a three-step methodology: (1) Computational fluid dynamics-derived drag coefficients: 2D OpenFOAM simulations determine normal and tangential drag coefficients for mussel droppers; (2) Hydro-elastic finite-element modeling: a time-domain finite-element model driven by Airy-wave kinematics and Morison loads to predict mooring, mainline, strap, and dropper responses under 10-, 25-, and 50-year return-period wave and current scenarios; and (3) Statistical risk assessment: simulation outputs are interpolated to create a continuous response field across the full range of wave heights and current speeds, which is then integrated with a joint probability density function of significant wave height and current speed – alongside component ultimate and residual strength at three growth phases – to estimate failure probabilities over specified design lives and recommend optimized safety factors. Results indicate that combining accurate drag coefficients with a continuous response surface and joint-PDF risk analysis enables systematic estimation of component failure probabilities and informs appropriate safety-factor selection. Thus, the proposed integrated methodology can be used to quantify structural failure risk and support informed design decisions for reliable offshore aquaculture structures.</div></div>","PeriodicalId":8120,"journal":{"name":"Aquacultural Engineering","volume":"111 ","pages":"Article 102575"},"PeriodicalIF":3.6,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144322245","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":"CFD optimised solar powered IoT integrated paddlewheel aerator for sustainable shrimp farming – A review","authors":"P. Jayraj ,&nbsp;Sridhar Sahoo ,&nbsp;Prasanta Jana ,&nbsp;Ritu Prem","doi":"10.1016/j.aquaeng.2025.102583","DOIUrl":"10.1016/j.aquaeng.2025.102583","url":null,"abstract":"<div><div>The present study reviews the research and development efforts aimed at improving paddlewheel aerator performance and energy efficiency in intensive shrimp farming in Asia. It examines previous studies to improve oxygen transfer efficiency through experimental design and operational parameters optimization, as well as the use of the computational fluid dynamic (CFD) method for paddlewheel design improvement. The review also covers the automation of the paddlewheel aerators by integrating Internet of Things (IoT) systems for real-time control based on dissolved oxygen (DO) levels in the shrimp ponds. Additionally, it explores the use of solar photovoltaic (PV) systems to reduce the reliance on grid electricity and energy consumption. However, there is a need for comprehensive research that combines CFD-based paddlewheel aerator design, IoT technology integration, and the use of solar power to improve the real-time performance and energy efficiency of commercially available paddlewheel aerators use for sustainability of semi-intensive and intensive shrimp farming in Asia. The evaluation of these system's ability to adapt in real-time to changing environmental conditions via IoT feedback has not been substantially studied in the literature. The culmination of these technologies offers a significant possibility to improve the efficiency of paddlewheel aerators, sustainability and profitability of shrimp farming operations while lowering the input costs and minimizing the environmental effects.</div></div>","PeriodicalId":8120,"journal":{"name":"Aquacultural Engineering","volume":"111 ","pages":"Article 102583"},"PeriodicalIF":3.6,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144312758","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":"Design and testing of the clam vibration harvester's V-shaped double-spiral harvesting roller brush based on DEM-MBD","authors":"Li Hangqi ,&nbsp;Mu Gang ,&nbsp;Li Xiuchen ,&nbsp;Wu Hao ,&nbsp;Xu Bin ,&nbsp;Liu Fawei ,&nbsp;Sun Zhenyin ,&nbsp;Zhang Qian ,&nbsp;Zhang Hanbing ,&nbsp;Xin Mingjin ,&nbsp;Zhang Guochen","doi":"10.1016/j.aquaeng.2025.102582","DOIUrl":"10.1016/j.aquaeng.2025.102582","url":null,"abstract":"<div><div>To address the challenges of low mechanization and the lack of theoretical research in clam harvesting on Chinese mudflats, a brush-screen cooperative clam vibration harvester was developed, and the V-shaped double-spiral harvesting roller brush served as the key component. White clams (<em>Mactra veneriformis</em>) were selected as the research subjects. A theoretical analysis of the harvesting roller brush was conducted, resulting in the derivation of key structural and operational parameter ranges. The Discrete Element Method (DEM) combined with Multi-Body Dynamics (MBD) was employed to simulate single-factor tests, Plackett-Burman tests, and response surface tests in shellfish harvesting. The optimal combination of key structural and operational parameters for the harvesting roller brush was identified as follows: bristle length of 105 mm, 5 bristle rows, bristle thickness of 40 mm, spiral angle of 28°, rotation speed of 48 r/min, and installation positions at X-axis 249 mm and Y-axis 9 mm. Under these conditions, the average mass of residual sediments on the screen surface was 10.59 g, the harvested shellfish mass was 177.4 g, and the shellfish breakage rate was 11.10 %. A prototype shellfish harvester was developed, and field tests demonstrated a harvested shellfish mass of 166.2 g, with a relative error of 8.57 %, a shellfish breakage rate of 7.07 %, an absolute breakage rate error of 4.03 %, and a harvesting efficiency of 292.20 kg/h. This study offers a valuable reference for the design and enhancement of mechanized harvesting for shellfish in mudflats.</div></div>","PeriodicalId":8120,"journal":{"name":"Aquacultural Engineering","volume":"111 ","pages":"Article 102582"},"PeriodicalIF":3.6,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144312761","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":"Smart technologies in aquaculture: An integrated IoT, AI, and blockchain framework for sustainable growth","authors":"Prince Jebedass Isaac Chandran ,&nbsp;Hana Ahmed Khalil ,&nbsp;PK Hashir ,&nbsp;Veerasingam S","doi":"10.1016/j.aquaeng.2025.102584","DOIUrl":"10.1016/j.aquaeng.2025.102584","url":null,"abstract":"<div><div>Aquaculture is vital for global food security, yet traditional methods often struggle with inefficiencies, disease outbreaks, and environmental concerns. This review explores how an integrated framework of Internet of Things (IoT), Artificial Intelligence (AI), and blockchain technology can transform aquaculture into a more efficient, sustainable, and intelligent industry. IoT enhances real-time monitoring and precision feeding, AI optimizes disease detection and resource management, and blockchain ensures transparency and traceability across the supply chain. This novel approach not only mitigates existing challenges but also fosters predictive analytics, automation, and data-driven decision-making. Although high costs and technical constraints pose challenges, adopting emerging technologies like 5 G, edge computing, and decentralized ledgers can accelerate industry-wide adoption and enhance resilience and scalability. Future innovations in AI-driven aquaculture must focus on adaptive machine learning models and cross-disciplinary collaborations to ensure resilience and scalability in the face of global demands.</div></div>","PeriodicalId":8120,"journal":{"name":"Aquacultural Engineering","volume":"111 ","pages":"Article 102584"},"PeriodicalIF":3.6,"publicationDate":"2025-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144307969","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":"An efficient fish counting method with adaptive global perception and multi-scale feature perception","authors":"Yiying Wang ,&nbsp;Dashe Li ,&nbsp;Jiaming Xin","doi":"10.1016/j.aquaeng.2025.102572","DOIUrl":"10.1016/j.aquaeng.2025.102572","url":null,"abstract":"<div><div>Under aquaculture conditions, efficient and accurate fish counting is crucial for fishery management and ecological protection. However, existing counting methods struggle to address challenges, such as fish overlap and scale variations in the presence of complex background noise. Therefore, this study proposes a CNN-based accurate fish-counting framework. The front-end network uses the first ten layers of VGG 16 to extract the main feature information. The framework first uses a multi-scale feature perception module and four parallel-dilated convolutional networks. Each dilated convolution uses a dilated convolution with a different dilation rate to extract diverse features from the image and adapts to scale changes. Second, to reduce the occlusion problem in counting, an adaptive global perception module was designed to optimize the focus on occluded areas through information interactions between channel features. Finally, an edge excitation module was designed to reweight the features in the channel through a parallel structure using two convolutional approaches, thereby enhancing the edge feature extraction. This module addresses the issue of neglecting edge pixels, improving the model’s ability to process edge features, and reducing interference from complex background noise. Experimentally, the MAE and RMSE of the model on the carp count dataset (CCD) were 2.64 and 3.58, respectively. The average counting accuracy was 94.76%. For the dense grass carp counting dataset (DGCD), the average counting accuracy of model was 96.96%. The model performed well in terms of counting accuracy and showed good stability. Overall, this study provides strong technical support for aquaculture management and ecological protection.</div></div>","PeriodicalId":8120,"journal":{"name":"Aquacultural Engineering","volume":"111 ","pages":"Article 102572"},"PeriodicalIF":3.6,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144312760","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":"Single pass solids removal by a hydrocyclone separator at varying flow rates from pond water used as a flow-through water source for catfish pond bank spawning tanks","authors":"Timothy J. Pfeiffer","doi":"10.1016/j.aquaeng.2025.102579","DOIUrl":"10.1016/j.aquaeng.2025.102579","url":null,"abstract":"<div><div>Catfish spawning is typically conducted by placing spawning containers in the shallow area of a pond where there is 0.6–0.9 m of water and when temperatures reach 24° C. The fish spawn in the containers, and the eggs are usually removed and incubated indoors. Currently, at the Warmwater Aquaculture Research unit (Stoneville, MS) fish biologists are using round polytanks placed on the pond bank for spawning container placement with pond water pumped through the tank and aeration diffusers in the tanks to assure the pond water is well oxygenated. Depending on how and where the water is obtained from in the pond there can be a heavy solids loads associated with the incoming water. A hydrocyclone was evaluated as a simple and easily managed unit to reduce the solids load of the incoming water flow. The pond water flowed to a line of one hundred polytanks (1.5 m Ø, 1.5m³). The mean total suspended solids (TSS) concentration in the incoming pond water ranged from 26.3 to 37.1 mg/L. Mean daily single pass solids removal rates were compared at four different flow rates, 114 lpm, 170 lpm, 227 lpm, and 303 lpm (30, 45, 60, and 80 gpm, respectively). The pump output flow was limited by the suction pressure of the water flow from the in-pond floating skimmer and the reduced diameter (3.18 cm) of the inlet pipe to the pump intake. The mean single pass solids removal efficiency, RE (%)from four consecutive days of sampling at each flow rate (n = 4) ranged from 12.0 % at 114 lpm to 23.9 % at 303 lpm. Removal rates increased with increasing flow but the test statistic with α at 0.05 indicated no observable significant difference. The mean amount of solids from the hydrocyclone underflow purge volume ranged from 24.4 g at 114 lpm to 31.6 g at 170 lpm. Significant greated solids amount were observed (α at 0.05) in the purge volumes at te 170 and 227 lpm flow rates, respectively. Scatter plots of RE % versus influent TSS (mg/L) and RE (%) versus grams of purged solids had a observable positive linear correlation (R² = 0.0.7628 and 0.80748, respectively) but the test statistic t was less than the table critical value at an α of 0.05. Implementing the hydrocyclone was a useful management technique in reducing the solids load from the incoming pond water source used for the seasonal catfish spawning purposes.</div></div>","PeriodicalId":8120,"journal":{"name":"Aquacultural Engineering","volume":"111 ","pages":"Article 102579"},"PeriodicalIF":3.6,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144262480","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":"Integration of process design and control of a pilot-scale recirculating aquaculture system","authors":"Shayesteh Dolatabadi,&nbsp;Luis Ricardez-Sandoval","doi":"10.1016/j.aquaeng.2025.102580","DOIUrl":"10.1016/j.aquaeng.2025.102580","url":null,"abstract":"<div><div>This work presents an optimization formulation to integrate design and control for Recirculating Aquaculture Systems (RAS). The key is to find a feasible and dynamically operable RAS with the optimal equipment sizing, control strategies, and batch time that maximizes the annual profit. Fish welfare was explicitly considered by enforcing limits on toxic components and taking into consideration the effects of water quality on the dynamic fish growth and mortality rates. A dynamic optimization control strategy was employed to ensure an optimal rearing environment. A pilot-scale rainbow trout RAS farm was selected as our case study. The proposed simultaneous design and control scheme was able to significantly enhance RAS profitability by running shorter batches in larger fish tanks with optimal control actions. Temperature effects and a disturbance scenario involving the feeding rate were investigated to gain further insights and advance the adoption of these emerging systems in aquaculture.</div></div>","PeriodicalId":8120,"journal":{"name":"Aquacultural Engineering","volume":"111 ","pages":"Article 102580"},"PeriodicalIF":3.6,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144240608","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}