Frontiers in Marine Science最新文献

{"title":"Regulating unmanned aircraft systems in Antarctica: challenges and collaborative solutions","authors":"Yitong Chen, Shu Wu","doi":"10.3389/fmars.2024.1486894","DOIUrl":"https://doi.org/10.3389/fmars.2024.1486894","url":null,"abstract":"The increasing use of unmanned aircraft systems (UAS) globally presents significant opportunities and challenges for Antarctic governance, particularly in terms of operational safety and environmental protection. This study investigates the challenges faced by various stakeholders in regulating UAS operations in Antarctica and identifies collaborative solutions, employing both empirical and comparative research methodologies. Data on domestic UAS regulations and Antarctic-specific rules from Antarctic Treaty Consultative Parties (ATCPs) were obtained through their official civil aviation websites, while the involvement of non-state actors in the Antarctic Treaty Consultative Meeting (ATCM) was assessed using information provided by the Antarctic Treaty Secretariat. The findings reveal that ATCPs have developed guidelines, manuals, and other regulatory tools and contribute actively to ATCM discussions. Non-state actors, leveraging their interdisciplinary expertise and research capabilities, also play a critical role in shaping UAS regulatory frameworks. Nevertheless, current rules governing UAS operations in Antarctica remain fragmented, underscoring the need for a more cohesive and comprehensive regulatory framework. As UAS regulations in Antarctica continue to evolve, effective rulemaking will require collaboration among diverse actors, integrating practical expertise, global regulatory standards, and the unique operational conditions of the Antarctic region. A comprehensive legally binding Measure or at least a resolution adopted by ATCM may be good start for this integrated regulatory process.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":"62 5 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142874096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bridging the protein gap with single-cell protein use in aquafeeds","authors":"Louise Buttle, Henk Noorman, Carol Roa Engel, Ester Santigosa","doi":"10.3389/fmars.2024.1384083","DOIUrl":"https://doi.org/10.3389/fmars.2024.1384083","url":null,"abstract":"Blue foods from aquaculture are essential in bridging the protein gap to feed the human population in the future. However, for aquaculture production to be sustainable, production must be within planetary boundaries, and sourcing of sustainable raw materials is a key driver in sustainable production. This article explores the role of single-cell proteins (SCPs) derived from microorganisms in aquafeeds. Three main aspects are discussed: sustainability, scalability of fermentation technology, and fish performance. In addition, and through a comprehensive proof-of-concept trial with rainbow trout (<jats:italic>Oncorhynchus mykiss</jats:italic>), this article demonstrates SCP’s efficacy in replacing traditional feed ingredients without compromising fish growth and health. The trial’s findings demonstrate a high protein digestibility and a balanced amino acid profile, as well as health benefits measured through oxidative burst response. To date, commercial adoption of SCP has been hindered by high production costs and the need for substantial investments to scale fermentation technologies. However, the sustainability landscape is changing as large industry players openly commit to sustainability targets and realize that longer-term and investment thinking into the future is needed. In conclusion, SCP emerges as a promising avenue for sustainable aquafeeds, offering a solution to the protein supply challenge within planetary boundaries. In addition, in terms of environmental benefit, SCP shows clear advantages regarding land use, carbon emissions, biodiversity impact, and water consumption. Ultimately, the successful integration of SCP into aquafeeds could significantly contribute to the industry’s sustainability goals and play an essential role in securing the future supply of raw material proteins.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":"82 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142873957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research on wave measurement and simulation experiments of binocular stereo vision based on intelligent feature matching","authors":"Junjie Wu, Shizhe Chen, Shixuan Liu, Miaomiao Song, Bo Wang, Qingyang Zhang, Yushang Wu, Zhuo Lei, Jiming Zhang, Xingkui Yan, Bin Miao","doi":"10.3389/fmars.2024.1508233","DOIUrl":"https://doi.org/10.3389/fmars.2024.1508233","url":null,"abstract":"Waves are crucial in ocean observation and research. Stereo vision-based wave measurement, offering non-contact, low-cost, and intelligent processing, is an emerging method. However, improving accuracy remains a challenge due to wave complexity. This paper presents a novel approach to measure wave height, period, and direction by combining deep learning-based stereo matching with feature matching techniques. To improve the discontinuity and low accuracy in disparity maps from traditional wave image matching algorithms, this paper proposes the use of a high-precision stereo matching method based on Pyramid Stereo Matching Network (PSM-Net).A 3D reconstruction method integrating Scale-Invariant Feature Transform (SIFT) with stereo matching was also introduced to overcome the limitations of template matching and interleaved spectrum methods, which only provide 2D data and fail to capture the full 3D motion of waves. This approach enables accurate wave direction measurement. Additionally, a six-degree-of-freedom platform was proposed to simulate waves, addressing the high costs and attenuation issues of traditional wave tank simulations. Experimental results show the prototype system achieves a wave height accuracy within 5%, period accuracy within 4%, and direction accuracy of ±2°, proving the method’s effectiveness and offering a new approach to stereo vision-based wave measurement.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":"92 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142873961","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Latitudinal influences on sound scattering layer characteristics in the Southwestern Indian Ocean: insights into oceanographic environmental interactions","authors":"Myounghee Kang, Fredrich Simanungkalit, Dongha Kang, Jihoon Jung, Joohyang Kim, Somang Song, Yeseul Kim, Dong-Jin Kang, SungHyun Nam","doi":"10.3389/fmars.2024.1481531","DOIUrl":"https://doi.org/10.3389/fmars.2024.1481531","url":null,"abstract":"Sound scattering layers (SSLs) are vital components of marine ecosystems, yet their morphometric and distributional characteristics remain understudied. This study investigates the SSL core in the southwestern Indian Ocean using a 38 kHz echosounder, focusing on its attributes across latitudinal gradients (20–4°S, 65°E) and three depth layers: epipelagic (0–100 m), intermediate (100–300 m), and mesopelagic (300–600 m). Our findings reveal the highest average acoustic values in the epipelagic layer (–72.9 dB), followed by the mesopelagic layer (–77.8 dB) and the intermediate layer (–82.5 dB). The SSL core was more prominent in northern latitudes (NLS) and showed greater depth variability in southern latitudes (SLS), with vertical profile peaks at 42.2 m and 431.1 m. In the NLS, the SSL core was longer (18,358 m &amp;gt; 6,788 m), thicker (13.8 m &amp;gt; 11.7 m), and more concentrated (aggregation index: 0.0053 m<jats:sup>−1</jats:sup> &amp;gt; 0.004 m<jats:sup>−1</jats:sup>), as well as more dispersed from the center (inertia: 269.9 m² &amp;gt; 112.7 m²). Notably, depth and acoustic fluctuations were more pronounced over circadian cycles in the SLS than in the NLS. Multiple regression analysis revealed that oceanographic factors influencing acoustic values varied by depth, highlighting the complex interactions within SSL ecosystems. These insights enhance our understanding of SSL dynamics and their implications for long-term monitoring and climate influence assessment.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":"116 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142874094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The effects of variable riverine inputs and seasonal shifts in phytoplankton communities on nitrate cycling in a coastal lagoon","authors":"Mindaugas Zilius, Rūta Barisevičiūtė, Stefano Bonaglia, Isabell Klawonn, Elise Lorre, Tobia Politi, Irma Vybernaite-Lubiene, Maren Voss, Donata Overlinge, Paul A. Bukaveckas","doi":"10.3389/fmars.2024.1497246","DOIUrl":"https://doi.org/10.3389/fmars.2024.1497246","url":null,"abstract":"Estuarine systems, being situated at the interface between land and marine environments, are important sites for nitrate (NO<jats:sub>3</jats:sub><jats:sup>–</jats:sup>) retention and processing due to large inputs, long retention time, and high biogeochemical activity. However, it remains uncertain how pelagic and benthic processes control NO<jats:sub>3</jats:sub><jats:sup>–</jats:sup> cycling and how the relative importance of these processes is affected by seasonal changes in estuarine conditions. We measured the suite of processes governing NO<jats:sub>3</jats:sub><jats:sup>–</jats:sup> cycling in the Curonian Lagoon (Southeast Baltic Sea) during two time periods representing spring and summer conditions. We show that in spring, benthic dissimilatory and assimilatory NO<jats:sub>3</jats:sub><jats:sup>–</jats:sup> processes prevailed, while in summer, pelagic assimilatory processes dominated. During spring, warming temperatures and riverine nitrogen (N) inputs were associated with the onset of diatom blooms. N assimilation by diatoms resulted in the delivery of particulate organic N and organic matter to the benthos, resulting in greater denitrification in the sediments and a flux of NO<jats:sub>3</jats:sub><jats:sup>–</jats:sup> from the water column to the sediments. In summer, phytoplankton blooms of buoyant cyanobacteria and high rates of assimilatory uptake dominated, resulting in greater particulate organic N export from the lagoon into the sea. Given the low dissolved inorganic N concentrations in summer, high uptake indicates that the pelagic community possessed a nutritional strategy to efficiently utilize multiple N forms at high rates. Overall, our findings show that diatom-dominated communities foster strong benthic-pelagic coupling, whereas cyanobacteria dominance is associated with pelagic-based N cycling. While this study sheds new light on mechanisms of NO<jats:sub>3</jats:sub><jats:sup>–</jats:sup> retention in the Curonian Lagoon, further spatiotemporal resolution is recommended to better represent the variability in rates and to include other Baltic lagoons for a comprehensive understanding of N cycling in shallow estuarine systems.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":"24 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142874093","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Estimating fish stock biomass using a Bayesian state-space model: accounting for catchability change due to technological progress","authors":"Makoto Nishimoto, Yoshinori Aoki, Naoto Matsubara, Paul Hamer, Yuichi Tsuda","doi":"10.3389/fmars.2024.1458257","DOIUrl":"https://doi.org/10.3389/fmars.2024.1458257","url":null,"abstract":"The assessment of trends in fish stocks using long-term time-series data is important for effective fisheries resource management. Despite technological advancements in recent decades, the resulting increase in fisheries catch potential with applied effort is often not adequately considered in stock assessments. To address this gap, we developed a framework for simultaneously estimating catchability and biomass using a state-space population model. This model allows for the flexible integration of the timing and functional form of the uptake of technological innovations that are assumed to influence catchability. Our objective was to test the effectiveness of this framework by applying it to 48 years of skipjack pole-and-line fishery data in Japanese waters. We utilized two population models, the Ricker-type and Gompertz-type, under three different scenarios of technology-driven catchability changes: constant, exponential, and S-shaped. The results indicate that the calculations converged for the constant and S-shaped scenarios, and that both the Ricker and Gompertz models performed almost equally well in terms of the goodness of fit and prediction accuracy under the S-shaped scenario, which assumes time-varying catchability. Although time-varying catchability poses challenges for accurate biomass estimation due to the large range of uncertainty, the decreasing trend in stock status is still detected. The estimated recent decline in the skipjack stock around Japan provides a warning for stock assessments that do not incorporate technological progress, despite the species’ high natural population growth rate and presumed stable stock status. Our methodology, based on publicly available archived catch records (catch and effort), can be applied to other species with known timelines of technological innovation.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":"25 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142879861","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Perfecting China’s anti-monopoly legal system: international shipping in the digital economy era","authors":"Yuanhong Shi","doi":"10.3389/fmars.2024.1508117","DOIUrl":"https://doi.org/10.3389/fmars.2024.1508117","url":null,"abstract":"The rapid development of digital economy promotes the transformation and upgrading of China’s shipping fields. Among them, the international shipping anti-monopoly legal system is one of the important contents of China’s shipping legislation. In the era of digital economy, it is difficult for the existing system to better regulate the international liner shipping market with shipping alliance as the core. Countries have re-examined the anti-monopoly legal regulation system of international shipping. As both a major shipping and trading country, it is urgent for China to improve its shipping legislation with the anti-monopoly system as its core. In order to cope with the new pattern of shipping alliance in the era of digital economy, we should learn from the advanced experience of international shipping legislation, base on the perspective of China’s shipping economic development and our own needs, and make effective exploration from the aspects of coordinating the development of digital economy and shipping management mechanism, improving shipping supervision ability and accelerating the improvement of shipping legal system with Chinese Characteristics.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":"5 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142873959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Adaptive mechanisms to hypoxia and hyperoxia in juvenile turbot, Scophthalmus maximus","authors":"Yi Chen, Yuntian Zhang, Rongwei Zhang, Hongsheng Deng, Xiangyu Meng, Kotoya Inaba, Tatsu Osato, Xiaoran Zhao, Yuzhe Han, Tongjun Ren","doi":"10.3389/fmars.2024.1515112","DOIUrl":"https://doi.org/10.3389/fmars.2024.1515112","url":null,"abstract":"In recirculating aquaculture systems (RAS), the impact of dissolved oxygen (DO) fluctuations on turbot is still not fully understood. This study investigated these impacts by selecting 135 turbot (average dry weight: 6.0 ± 0.5 g) and exposing them to three DO levels: hypoxia (4.0 ± 0.5 mg/L), normoxia (7.5 ± 0.5 mg/L), and hyperoxia (23.5 ± 0.5 mg/L). These groups were labeled as LF (low oxygen), NF (normal oxygen), and HF (high oxygen). The study aimed to explore the adaptive mechanisms of turbot under hypoxic and hyperoxic conditions, using microbiome, transcriptome, and hematological analyses over a 40-day period. The results suggest that hyperoxia significantly enhances turbot growth without compromising the composition of intestinal microbiome, whereas hypoxia markedly impairs growth and induces alterations in intestinal microbiome. Transcriptomic analysis revealed various pathways implicated in adaptation to both hypoxic and hyperoxic conditions, encompassing amino acid metabolism, protein metabolism, lipid metabolism, carbohydrate metabolism, the PPAR signaling pathway, etc. However, pathway changes are not completely consistent. For instance, pancreatic secretion is crucial for hyperoxia adaptation, while the HIF1α pathway plays a key role in hypoxia adaptation and tissue repair. Furthermore, genes <jats:italic>ATP6</jats:italic>, <jats:italic>HIF1</jats:italic>, <jats:italic>HSP90</jats:italic>, and <jats:italic>CYP450</jats:italic> exhibited high expression levels during hypoxia, whereas <jats:italic>Hbae5</jats:italic> and <jats:italic>Man-SL</jats:italic> showed elevated expression during hyperoxia. In hematological indicators, there are ways to help adapt to hypoxia and hyperoxia, including increased red blood cell (RBC) and hemoglobin (HGB) counts; gas and ion balance; elevated blood urea nitrogen (BUN) and malondialdehyde (MDA); increased polyphenol oxidase (PPO) and lysozyme (LZM) activity. Although turbot have adaptive mechanisms to both hypoxia and hyperoxia, extended exposure to hypoxia detrimentally affects growth, whereas hyperoxia facilitates it. These findings provide significant insights into the adaptive mechanisms of turbot in response to fluctuating DO levels.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":"73 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142867450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A systematic review on the use of food web models for addressing the social and economic consequences of fisheries policies and environmental change","authors":"Diya Chakravorty, Enrico Nicola Armelloni, Santiago de la Puente","doi":"10.3389/fmars.2024.1489984","DOIUrl":"https://doi.org/10.3389/fmars.2024.1489984","url":null,"abstract":"Fisheries are complex systems. Food web models are increasingly being used to study the ecological consequences of fisheries policies and environmental change on such systems around the world. Nonetheless, these consequences extend well into the social, economic, cultural, and political domains of such systems. The main goal of this contribution is to characterize how food web models are being used to study the socioeconomic consequences of management actions and environmental change. We conducted a systematic literature review covering research published between January 2010 and July 2023. Only 47 papers (out of an initial pool of 506 publications) met our research criteria. Based on this, it is evident that the body of literature has been increasing slowly and at a constant rate – a condition not shared with other emerging research fields. Modeled systems were mostly marine (87%), covering the waters of 38 countries across 19 Large Marine Ecosystems; albeit mostly in the Global North. The ecological components of the reviewed models (e.g., functional groups) were represented at a much finer scale than their socioeconomic counterparts. Most models were developed using Ecopath with Ecosim (68%) or Atlantis (21%) modeling software suites. Four key research foci were identified across the selected literature. These shaped the methodological approaches followed, as well as the models’ capabilities, the simulation drivers, the way food webs were integrated with bioeconomic models, and the performance metrics they used and reported. Nonetheless, less than half captured social concerns, only one-third addressed trade-offs among management objectives, and only a handful explicitly addressed uncertainty. The implications of these findings are discussed in detail with respect to resource managers needs for ecosystem-based fisheries management and ecosystem-based management. Our collective understanding of the interlinkages between the biophysical and socioeconomic components of aquatic systems is still limited. We hope this review is seen as a call for action and that the food web modeling community rises to the challenge of embracing interdisciplinarity to bridge existing knowledge silos and improve our ability to model aquatic systems across all their domains and components.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":"41 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142867451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of dietary lipid levels on growth, antioxidant capacity, intestinal and liver structure of juvenile giant salamander (Andrias davidianus)","authors":"Xiaolu Yan, Lingcheng Pan, Junqi Yu, Shuang Wang, Yong Li, Min Zhao, Xuliang Zhai, Yang Xue, Li Luo","doi":"10.3389/fmars.2024.1515014","DOIUrl":"https://doi.org/10.3389/fmars.2024.1515014","url":null,"abstract":"This research was to assess how varying dietary lipid levels influence the growth, body composition, antioxidant capacity of the liver, and the structure of liver and intestine in <jats:italic>A. davidianus</jats:italic>. The juvenile <jats:italic>A. davidianus</jats:italic> (initial weight of 34.20 ± 0.27g) were given isonitrogenous diets (crude protein 57%) that contained six different levels of lipid (5.02%, 8.96%, 12.90%, 16.21%, 19.46%, and 22.80%, respectively) for 105 days. The results revealed that WGR, SGR, PRR and muscle RNA/DNA ratio were significantly enhanced by dietary lipid level up to 16.21%, beyond which these parameters declined; FCR exhibited an inverse trend(<jats:italic>P</jats:italic>&amp;lt;0.05). The maximum activity of intestinal digestive enzymes and superoxide dismutase (SOD) were observed at the 16.21% dietary lipid level, accompanied by a significant reduction in liver malondialdehyde (MDA) concentration (<jats:italic>P</jats:italic>&amp;lt;0.05). With the increase in dietary lipid level, the lipid content of both the whole body and liver, along with skin collagen content, initially improved before subsequently declining(<jats:italic>P</jats:italic>&amp;lt;0.05). At the 16.21% dietary lipid level, the height, number, and width of intestinal mucosal folds significantly increase (<jats:italic>P</jats:italic>&amp;lt;0.05), and intestinal microvilli were more orderly arranged. At the 22.80% dietary lipid level, the liver cells exhibited degradation of the cell membrane, alongside an increased presence of autophagosomes; additionally, the mitochondria demonstrated significant swelling and rounding. Optimal lipid level could enhance feed utilization efficiency and promote both intestinal and liver health in <jats:italic>A. davidianus</jats:italic>. In contrast, high dietary lipid level has a detrimental effect on the health of <jats:italic>A. davidianus</jats:italic>. According to WGR, skin collagen content, muscle RNA/DNA ratio, total cholesterol (TCHO) and lipase activity, it has been determined through quadratic curve model analysis that the optimal dietary lipid level for juvenile <jats:italic>A. davidianus</jats:italic> ranges from 13.3% to 17.5%.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":"90 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142867449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}