Aquacultural Engineering最新文献

{"title":"Hydrodynamic characteristics of the aluminum alloy net panel in regular waves: An experimental study","authors":"Yu Lei ,&nbsp;Weidong Li ,&nbsp;Xiang Yuan Zheng ,&nbsp;Xiao Cai ,&nbsp;Shan Gao ,&nbsp;Huadong Zheng ,&nbsp;Sheng Zhang ,&nbsp;Xin Liu","doi":"10.1016/j.aquaeng.2025.102531","DOIUrl":"10.1016/j.aquaeng.2025.102531","url":null,"abstract":"<div><div>Copper alloy nets have attracted more and more attention in marine aquaculture, due to their better performance to resist biofouling and corrosion. In the present study, a series of laboratory experiments are conducted to investigate the hydrodynamic characteristics of the chain-link type alloy nets in waves. The wave elevations at different downstream locations of the nets and the wave forces on the downstream net panel are measured to investigate the shielding effects of the upstream aluminum alloy nets. The wave transmission and shielding coefficients under different wave heights, wave periods, and immersion depths are derived. The experimental data show that the wave transmission coefficient fluctuates around 1 (1 ± 0.04), whether only a single net or two parallel nets are placed in water, and the shielding coefficient also fluctuates around 1 (1 ± 0.07) under different conditions. Both two coefficients have weak correlation with wave heights, wave periods and immersion depths of the net panel. It indicates that the shielding effects of such metal nets are negligible. To obtain the empirical hydrodynamic coefficients through test data, a user-friendly numerical optimization scheme is developed. The optimized hydrodynamic coefficients can well predict the wave force on the frame and the nets.</div></div>","PeriodicalId":8120,"journal":{"name":"Aquacultural Engineering","volume":"110 ","pages":"Article 102531"},"PeriodicalIF":3.6,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143644375","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":"Establishment and performance of sea purslane (Sesuvium portulacastrum) in marine aquaponics with hybrid grouper","authors":"Miaofeng Yang ,&nbsp;Yongqing Lin ,&nbsp;Shenghua Zheng ,&nbsp;Huidong Zheng ,&nbsp;Fang Yang ,&nbsp;Yingyu Xi ,&nbsp;Donglian Luo","doi":"10.1016/j.aquaeng.2025.102530","DOIUrl":"10.1016/j.aquaeng.2025.102530","url":null,"abstract":"<div><div>Aquaponic systems are sustainable and environmentally friendly, primarily through the recycling of nutrients. However, identifying feasible combinations that achieve favorable economic and environmental performance in a win<img>win mariculture system can be challenging. A novel aquaponic mariculture system was established by combining sea purslane (<em>Sesuvium portulacastrum</em>) with hybrid grouper (<em>Epinephelus</em> sp.), and its performance was assessed. Triplicate experimental fish ponds assembled with floating plant beds of sea purslane (<strong>SP</strong> group) were compared with the control (without phytotreatment, <strong>CK</strong> group) over a 56-day experimental period. The changes in major pollutants in the system and the growth performance of the plants and groupers were analyzed. The results showed that the removal rates of pollutants in the sea purslane aquaponic system were 98.1 %, 97.5 %, 89.9 % and 50.6 % for total ammonia nitrogen (TAN), nitrite nitrogen, total suspended solids (TSS) and chemical oxygen demand (COD), respectively. Furthermore, the removal rates of total nitrogen (TN), total phosphorus (TP), dissolved inorganic nitrogen (DIN), and dissolved inorganic phosphorus (DIP) were 19.6 %, 12.0 %, 18.4 % and 16.2 %, respectively, in the <strong>SP</strong> group. With respect to growth performance, the specific growth rate (SGR) of groupers in the <strong>SP</strong> group increased by 43 % compared with that in the <strong>CK</strong> group. Grouper growth in the <strong>SP</strong> group showed strong negative allometric growth, whereas isometric growth was observed in the CK group. The net growth of sea purslane increased by 4.32 ± 1.64 kg/m², with a relative growth rate of 0.90 ± 0.28 %/d, showing considerable incorporation of carbon via photosynthesis. Moreover, the sea purslane–grouper aquaponics system can be maintained at a low cost and is easily managed. In conclusion, the potential of this innovative marine aquaponic system was demonstrated, and the findings will contribute to enhancing the performance of environmentally friendly mariculture techniques in the future.</div></div>","PeriodicalId":8120,"journal":{"name":"Aquacultural Engineering","volume":"110 ","pages":"Article 102530"},"PeriodicalIF":3.6,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143620457","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":"Time-series growth estimation of sea cucumbers (Apostichopus japonicus) in co-cultivation with coho salmon using time-lapse cameras in field experiments","authors":"Takero Yoshida ,&nbsp;Kasumi Kogo","doi":"10.1016/j.aquaeng.2025.102529","DOIUrl":"10.1016/j.aquaeng.2025.102529","url":null,"abstract":"<div><div>As Integrated Multi-Trophic Aquaculture (IMTA) continues to gain attention, this study investigated the co-culture of coho salmon (<em>Oncorhynchus kisutch</em>) and juvenile Japanese sea cucumber (<em>Apostichopus japonicus</em>) in Kuji Bay, Iwate Prefecture, Japan. The sea cucumbers were housed separately in box cages below the coho salmon aquaculture cages, and the growth was monitored using an underwater time-lapse camera from December 2022 to May 2023. The time-lapse camera was used to monitor the small sea cucumbers with an average body weight of 1.2 g for the initial stage. Semantic segmentation using the Segment Anything Model (SAM) was then applied to the images to separate the sea cucumbers from the background. Body weights were converted from the area of the sea cucumbers in the images. The estimated body weights were plotted over time and compared with the measured body weights. From this, a time-lapse camera can be used to roughly estimate the growth of sea cucumbers over time, which will be helpful to understand the co-cultured sea cucumbers.</div></div>","PeriodicalId":8120,"journal":{"name":"Aquacultural Engineering","volume":"110 ","pages":"Article 102529"},"PeriodicalIF":3.6,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143601347","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":"Physical and numerical modeling of seaweed in oceanic waters","authors":"Henrik Neufeldt ,&nbsp;Christian Windt ,&nbsp;Bela H. Buck ,&nbsp;Kevin Heasman ,&nbsp;Arndt Hildebrandt ,&nbsp;Nils Goseberg","doi":"10.1016/j.aquaeng.2025.102528","DOIUrl":"10.1016/j.aquaeng.2025.102528","url":null,"abstract":"<div><div>Understanding the dynamics of the stress imposed by water motion on seaweeds in oceanic waters is crucial for effective coastal management and the sustainable development of seaweed-based industries. However, the dynamics of highly flexible seaweeds (e.g., <em>Saccharina latissima</em> or <em>Laminiara digitata</em>), driven by its mechanical and morphological properties, poses challenges for conventional fluid-structure-interaction models. This paper provides a comprehensive review of physical and numerical modeling approaches for seaweed hydrodynamics, aiming to identify knowledge gaps and offer guidelines for future research. Methods for determining the physical properties of seaweeds are being reviewed. However, for living organisms, these properties change as a result of age, mechanical impact or environmental conditions. Therefore, we also review the impact of various influencing factors on the physical properties. Hydrodynamic properties of seaweeds (e.g., drag, reconfiguration, shading effects) and the connection with their physical properties will be discussed. Moreover, a comparison between physical and numerical models for the determination of hydrodynamic loads on seaweeds is presented, discussing their possibilities and limitations. Finally, the paper investigates differences in force determination between isolated seaweed, seaweed farms and forests, as well as variations between flow-dominated and wave-dominated environments. The review reveals the challenges in comparing physical and hydrodynamic properties of seaweeds across different studies. It also identifies knowledge gaps in the parametrization of these properties. The recommended guidelines proposed in this paper provide a first framework to address these challenges and minimize variability between studies, thereby offering valuable guidance for future research.</div></div>","PeriodicalId":8120,"journal":{"name":"Aquacultural Engineering","volume":"110 ","pages":"Article 102528"},"PeriodicalIF":3.6,"publicationDate":"2025-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143578263","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":"A hybrid approach towards real-time monitoring of fish distributions in aquaculture net cage","authors":"Qin Zhang ,&nbsp;Biao Su","doi":"10.1016/j.aquaeng.2025.102527","DOIUrl":"10.1016/j.aquaeng.2025.102527","url":null,"abstract":"<div><div>Cage based salmon aquaculture has grown substantially over the last decades, however it is still, to a large degree, relying on experience-based production regime today. Advances in the digital transformation of the aquaculture industry will improve the ability to monitor, control and document the production systems, and facilitate knowledge-based decision making. In this paper, a combined instrumentation and interpreting solution is proposed and tested for monitoring fish distributions in aquaculture net cage. Farmed salmon in a full-scale sea cage are simulated by an individual-based fish model. And real-time behavioural changes are introduced and determined by data-driven parameter identification, thereby reflecting observed fish distributions from a set of single-beam echosounders. This forms a hybrid approach to combine the interpretability of physics-based models with the automatic pattern-identification capabilities of advanced deep learning algorithms. The performance of a tentative instrumental and model setup is evaluated by comparing with measured fish density data, while providing more detailed information such as the number and swimming speed of the fish, which are notoriously difficult to quantify using conventional solutions. The proposed hybrid approach is considered to be suitable for developing a more comprehensive fish monitoring system to be used on a daily basis in marine aquaculture.</div></div>","PeriodicalId":8120,"journal":{"name":"Aquacultural Engineering","volume":"110 ","pages":"Article 102527"},"PeriodicalIF":3.6,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143527536","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":"Development and evaluation of reference feed intake models for meagre (Argyrosomus regius)","authors":"Marina Linhares Azevedo ,&nbsp;Tomé Silva ,&nbsp;Filipe Soares ,&nbsp;Sergey Budaev ,&nbsp;Luis E.C. Conceição ,&nbsp;Ivar Rønnestad","doi":"10.1016/j.aquaeng.2025.102526","DOIUrl":"10.1016/j.aquaeng.2025.102526","url":null,"abstract":"<div><div>The aim of the study was to identify a basic reference feed intake model to facilitate understanding of the impact of temperature as the key environmental factor, along with body weight and dietary composition. These basic models should provide the baseline for further research to advance precision farming practices and support efficient production for meagre (<em>Argyrosomus regius</em>). Several reference models, with different levels of complexity, were built using data from scientific publications and feeding tables, followed by evaluating 27 different models using various fitting methods. Each model's mean absolute percentage error was estimated through repeated 5-fold cross-validation (with n = 200 iterations). Models were divided into four categories based on the inclusion of temperature and diet composition parameters: simple feed-independent models, complex feed-independent models, simple feed-dependent models, and complex feed-dependent models. The best model from each category was identified, followed by an assessment of the overall best. Consistent with dynamic energy budget theory, models using a fixed body weight exponent of 2/3 demonstrated better fit. Feed-dependent models incorporating lipid levels outperformed feed-independent ones. Additionally, simpler models with temperature parameters effectively predicted feed intake at optimal temperatures, while more complex models predicted intake better above the thermal optimum. The reference models selected in this study can be applied to estimate feed requirements over time for production or experimental trials, benchmark feeding to isolate the effect of other variables, support growth models and alternative feeding tables, and provide decision support.</div></div>","PeriodicalId":8120,"journal":{"name":"Aquacultural Engineering","volume":"110 ","pages":"Article 102526"},"PeriodicalIF":3.6,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143527535","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":"Energy analysis in fish aquaculture: Cumulative energy demand of different farming systems","authors":"Michele Zoli,&nbsp;Jacopo Bacenetti","doi":"10.1016/j.aquaeng.2025.102525","DOIUrl":"10.1016/j.aquaeng.2025.102525","url":null,"abstract":"<div><div>Energy consumption is one of the critical challenges for the continued growth of the aquaculture sector. In addition to the substantial feed consumption common to all types of systems, the high direct energy demand is driven by electricity use for water extraction, pumping, and aeration in land-based farms, and by fuel consumption in coastal farms. The aim of this study is to analyse the Cumulative Energy Demand (CED) of the production of European Sea Bass and Gilthead Sea Bream across different farming systems in the Mediterranean area. By focusing on both land-based and coastal sea-cage systems, an energy analysis of four different farms was conducted using a “from cradle to gate” life cycle approach. The functional unit for this study was set at 1 tonne of fish. The results show that land-based farms have a higher CED (168,535 and 188,642 MJ/t) due to both feed consumption (32 and 39 % of the total) and the use of liquid oxygen (46 and 16 % of the total) and direct electricity (20 and 43 % of the total, with on-site electricity consumption of 34,167.6 and 14,086.8 MJ/t). The lower CED of coastal farms (66,224 and 76,507 MJ/t) is largely due to feed usage (around 90 % of the total) and low fuel intensity (67.6 and 82.9 l/t, corresponding to 2495 and 3057 MJ/t, respectively). A scenario analysis was conducted using the 2030 projected national electricity mix of the Integrated National Energy and Climate Plan for land-based farms. Additionally, the impact of substituting diesel with biofuel in coastal farms was evaluated. The results indicate that these changes could reduce the use of non-renewable sources by at least 5 %.</div></div>","PeriodicalId":8120,"journal":{"name":"Aquacultural Engineering","volume":"110 ","pages":"Article 102525"},"PeriodicalIF":3.6,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143508456","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":"Effects of biofilter management modalities on the microbiological status in RAS water to avoid recording capacities of biofilms","authors":"Al Dakdouki Salam ,&nbsp;Nivelle Renaud ,&nbsp;Ledoré Yannick ,&nbsp;Fontaine Pascal ,&nbsp;Frédérique Changey","doi":"10.1016/j.aquaeng.2025.102522","DOIUrl":"10.1016/j.aquaeng.2025.102522","url":null,"abstract":"<div><div>Recirculating Aquaculture Systems (RAS) are increasingly seen as a breeding system of the future. the development of RAS requires understanding the microbial communities, as they play a significant role in the system functioning, water quality and therefore fish welfare and organoleptic characteristics. However, some aspects remain insufficiently explored, such as information regarding the residual microorganisms persisting in the system and originating from the past rearing conditions. Any studies on microbial communities in RAS mention specific protocols to obtain a similar initial microbial state in their systems before conducting their new studies. In this context, controlling the initial RAS microbial status (before starting a breeding cycle) and having a reliable, standardized protocol for obtaining this state in a reproducible way is essential. In contrast to a standard protocol (i.e. only raw cleaning), this study aimed to evaluate the effects of two treatments that differ in the way of management of biofilter media. The water microbial communities’ structure was assessed through the 16S rRNA gene over two weeks’ post-treatment. The results show that the standard protocol does not shift the microbial past of the tank and is responsible for strong inter-tanks heterogeneity. The testing protocol number T1 is the most reliable for homogenising initial microbial composition of tanks while preserving the microbial communities of interest.</div></div>","PeriodicalId":8120,"journal":{"name":"Aquacultural Engineering","volume":"110 ","pages":"Article 102522"},"PeriodicalIF":3.6,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143609254","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":"Biopolymer-encapsulated calcium peroxide tablets for slow sustained release of dissolved oxygen in fish tank","authors":"Akankshya Das ,&nbsp;Yi Sun ,&nbsp;Dhruba Jyoti Sarkar ,&nbsp;V. Santhana Kumar ,&nbsp;Basanta Kumar Das","doi":"10.1016/j.aquaeng.2025.102524","DOIUrl":"10.1016/j.aquaeng.2025.102524","url":null,"abstract":"<div><div>Dissolved oxygen (DO) is a critical water quality parameter for intensive aquaculture activities in tanks. For better fish survivability slow and sustained release oxygen formula is needed to maintain the optimum DO level for long time as traditional oxygen release tablets are fast-releasing and a repetitive application is required under emergency conditions and also during live fish marketing and transportation. In the present study, calcium peroxide tablets coated with a biopolymer, cellulose acetate and the performance of these coated tablets is tested for their superior oxygen release properties in fish tanks. The result revealed that coated oxygen tablets with cellulose acetate prolonged (43 % higher) the duration of oxygen release as compared to non-coated calcium oxide tablets in tanks without fish. Whereas in tanks with fish (<em>Labeo catla</em> fingerlings) addition of two coated tablets prolonged the optimum DO level for 3 h which is 33 % higher than the non-coated tablets. An addition of 10 noncoated tablets in fish tank created a hyperoxic condition and the DO level increased above 12 ppm, leading to agitated fish behavior. However, same level of coated tablets addition maintained the DO level above 5 ppm for 16 h and did not render any abnormal fish behaviour. Hence it can be concluded that cellulose acetate-coated calcium peroxide tablets can be utilised for intensive aquaculture for better performance and safe application for increasing the DO level during an emergency.</div></div>","PeriodicalId":8120,"journal":{"name":"Aquacultural Engineering","volume":"110 ","pages":"Article 102524"},"PeriodicalIF":3.6,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143428269","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":"Factors influencing feed distribution uniformity in aquaculture vessels based on DEM","authors":"Zhixin Xiong ,&nbsp;Zinuo Huang ,&nbsp;Yao Shi ,&nbsp;Ming Ma","doi":"10.1016/j.aquaeng.2025.102523","DOIUrl":"10.1016/j.aquaeng.2025.102523","url":null,"abstract":"<div><div>To meet the feeding operation requirements of aquaculture vessels and enhance feed quality while minimizing fish competition and uneven feeding—factors that can degrade feed quality—a low-speed, uniformly distributing feeding disk was designed. This study uses Star-CCM+ to simulate the feed dispersal process of the rotating feeding disk and analyzes the effects of various factors on feed particle distribution. A discrete element model based on the mesh-free method was developed, incorporating the Hertz-Mindlin contact model for discrete feed particles, with rotating speed, height above the water surface, and initial particle velocity as variables. The shape and range of the dispersed feed distribution were observed. The results indicate that appropriately increasing the rotating speed or height improves feed distribution uniformity and increases the dispersal range. The optimal feeding effect is achieved when the drop height is 2 m and the rotating speed is 20 rpm. To evaluate the impact of ship roll on feed distribution, initial particle velocities were set to simulate changes under unstable sea conditions. When the initial particle velocity is 0.75 m/s, increasing the rotating speed to 20 rpm enhances distribution uniformity. This study provides valuable insights into the design and operational parameters of rotating feeding disks and serves as a reference for the development of feeding equipment for aquaculture vessels.</div></div>","PeriodicalId":8120,"journal":{"name":"Aquacultural Engineering","volume":"110 ","pages":"Article 102523"},"PeriodicalIF":3.6,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143422378","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}