Hasil untuk "Aquaculture. Fisheries. Angling"

Stelios Negrepontis, Athanase Papadopoulos

We provide some historical context to the study of solid angles carried out by Euler in his memoir \emph{De mensura angulorum solidorum} (On the measure of solid angles). We extend our study to the general notion of angle (not only solid). While doing so, we explore some works by Ancient Greek mathematicians and others by Arabs mathematicians of the Middle-Ages as well as some later Western authors from the Renaissance. In particular, we review the Pythagorean anthyphairetical perspective on angles which establishes the basis of the important relation between the mathematical notion of angle and the philosophical concept of finitization of the Infinite. In doing so, we shall show that questions addressed by Euler lead us to questions raised about 2500 years ago. At the same time, we highlight the fact that mathematics in those times is also today's mathematics. The reader can also see in this study the intermingling between mathematics and philosophy. This paper will appear in the book \emph{Spherical geometry in the Eighteenth Century, I: Euler, Lagrange and Lambert}, ed. R. Caddeo and A. Papadopoulos, Springer, 2026.

Tapas Paul, Rishika M S, Bhautik D. Savaliya et al.

This study evaluated the potential of sugarcane bagasse biochar as a low-cost adsorbent for removing 2, 4-dichlorophenol (2, 4-DCP), an emerging pollutant from water using adsorption modelling and response surface methodology. It aimed to determine optimal combinations of concentration, contact time, pH and dose for maximizing contaminant uptake in batch and column systems. Batch adsorption experiments were planned using a Box–Behnken response surface experimental design with initial 2, 4-DCP concentration (25, 50, and 75 mg L–¹), contact time (20, 40, and 60 min), solution pH (5, 7, and 9), and biochar dosage (6.25, 12.5, and 25 mg). Fixed-bed column studies were conducted under continuous flow to assess dynamic performance and breakthrough behaviour. Adsorption equilibrium, kinetics and column behaviour were analysed using standard isotherm and kinetic models, supported by surface and functional-group characterization. The optimized batch conditions produced removal efficiencies of about 95% with high monolayer adsorption capacity on a homogeneous biochar surface. The equilibrium data followed a monolayer adsorption model, while kinetic analysis indicated rapid uptake controlled primarily by surface-site availability. Column studies showed high dynamic capacity and well-defined breakthrough characteristics under the tested flow conditions. Sugarcane bagasse biochar proved to be an efficient and technically suitable material for removing phenolic contaminants such as 2, 4-DCP from water. The findings demonstrate a productive use of agro-industrial waste for water purification and support its application in practical treatment units for removing emerging pollutants in aquatic environments.

N. Rowan

human-centric solutions. This viewpoint describes the role of Quadruple helix Hub (academic-industry-government and society) in delivering a convergent holistic approach to meeting the diversity of fishery industry needs by connecting and placing fisheries centrally in a defined ecosystem of stakeholders. This includes specialist training, testing technologies, providing access to finance and fostering disruption through aquaculture accelerator initiatives such as that provided by Hatch Blue. Connecting digital Innovation Hubs trans -regionally, nationally and internationally will also help mitigate against significant risks for the fisheries and aquaculture industry including climate change, global pandemics and conflicts that can jeopardize fish and seafood production and supply chains. There is also a commensurate need to avail of digital technologies in order to increase awareness of key industry issues across the value chain, such as through social marketing. Thus, addressing key challenges by way of the global digital transformation of fishery and aquaculture industry will meet several sustainable development goals of the United Nations catered around the application of disruptive technology.

I. Adebayo, Segun Ajibola, Ali Ahmad et al.

Zhangfan Huang, Longhui Liu, Zhongbao Li

Over the past two decades, China's spotted sea bass (Lateolabrax maculatus) aquaculture has flourished and made significant contributions to the national fishery economy. Characterized by a rapid growth rate and strong adaptability to various environmental conditions, this species also possesses the potential for global promotion in the aquaculture industry. The achievements in China's spotted sea bass aquaculture are inherently tied to progress in multidisciplinary knowledge and technology. To further catalyze the high‐quality development of the industry, a systematic review encompassing diverse research areas is imperative. This review encapsulates the advancements made in China's spotted sea bass aquaculture over the past two decades, and synthesizes decades of research progress encompassing germplasm management, seed production, breeding, nutrition, and common diseases. On this basis, it provides insights into the current challenges confronting the industry and highlights further goals for the industry's development. Such a review is not only of great significance for promoting the further systematic development of China's spotted sea bass aquaculture but also serves as a Chinese model for reference to the global promotion of spotted sea bass aquaculture practices.

Liming Shao, Hong Yu, Wei Huang et al.

Carlos Fajardo, G. Martínez‐Rodríguez, J. Blasco et al.

improvement of the efficiency and the environmental impact of this industry. Given this perspective, we propose to review the current situation of nanotechnology in the field of aquaculture and fisheries, emphasizing not only in current applications, and future prospects, but also in the ethical and governance aspects associated with this topic.

James Brister, Bingwei Long, Longjie Ran et al.

In addition to the well-known quantum chromodynamical theta angle, we show that the Standard Model has another theta angle which is invariant under arbitrary chiral rotations of quarks and leptons. The new theta angle can be identified with the quantum electrodynamical theta angle, which should be viewed as an independent parameter of the Standard Model, and may be observable in spacetime with non-simply connected features, either beyond the visible universe or in an effective background from a laboratory setup.

Sheu G. Odu‐Onikosi, Taofik A. Momoh, Benjamin Eynon et al.

Abstract The early life stages of fish are critical for determining the overall productivity and sustainability of aquaculture operations. This study investigated the effects of dietary autolyzed brewer's yeast (ABY) on the growth performance and intestinal health of Nile tilapia fry (Oreochromis niloticus). A 35‐day feeding trial with 480 Nile tilapia fry across 12 experimental tanks tested the effects of diets supplemented with 1, 2, and 4 g/kg of ABY, with a control diet for comparison. The results indicated that the diet which had 1 g/kg ABY supplementation (ABY1) significantly enhanced the weight gain and specific growth rate (SGR) while reducing feed conversion ratio (FCR) compared to the control diet. Intestinal gene expression analysis showed significant upregulation of immunoregulatory genes (tlr2, il10, il1β, and igm), and a tight junction gene (occludin) in the ABY1 group. Conversely, tnfα expression was significantly downregulated in the ABY1 and ABY2 groups, indicating a potential anti‐inflammatory effect. Histological analysis of the mid‐intestine revealed healthy morphology with no significant differences in mucosal fold length, muscularis thickness, lamina propria width, and goblet cell count among the treatment groups. The findings demonstrate that supplementing diets with ABY at 1 g/kg level enhances growth performance and modulates the intestinal immune response of Nile tilapia fry, without compromising intestinal integrity. This study offers valuable insights into using ABY as a functional feed additive to enhance Nile tilapia health and development, as well as to promote aquaculture sustainability.

Guoyong Huang, Weibin Huang, Guangcai Fu et al.

This study investigated the effects of adding lycopene to oxidized fish oil diets on the growth and liver health in Jinhu grouper (Epinephelus fuscoguttatus ♀ × Epinephelus tukula ♂). Fish were fed one of five diets for 8-weeks: (1) FFO: 9 % fresh fish oil (control); (2) OFO: 6 % fresh fish oil and 3 % oxidized fish oil (negative control); (3) LYC1-LYC3: OFO diet supplemented with lycopene (200, 400, 600 mg/kg, respectively). The results showed that the growth performance and whole body crude lipid content were significantly higher in the FFO and LYC groups compared to the OFO group (P < 0.05). Whole body crude lipid was highest in the LYC2 group. In serum biochemical indicators, high-density lipoprotein cholesterol (HDL-C) levels were significantly higher and low-density lipoprotein cholesterol (LDL-C) levels significantly lower in the FFO and LYC2 groups versus the OFO group (P < 0.05). In hepatic antioxidant enzymes, the activities of superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GPx) were significantly elevated in the FFO and LYC groups compared to the OFO group (P < 0.05). CAT activity was highest in the LYC2 group. In hepatic antioxidant-related and immune-related gene, LYC groups significantly upregulated the sod, cat, gpx genes and down-regulated the pro-inflammatory factors interleukin-1β (il-1β), interleukin-8 (il-8), and tumor necrosis factor-α (tnf-α) compared to the OFO group (P < 0.05). Conclusion: Dietary lycopene effectively attenuated oxidized fish oil-induced oxidative stress and inflammation in grouper by modulating hepatic antioxidant and immune-related gene expression. Under the experimental conditions, 400 mg/kg lycopene (LYC2 group) demonstrated the optimal protective efficacy.

Zhen Xu, Xiaoying Xu, Weidong Li et al.

This study investigated the effects of partially substituting fishmeal (FM) with fermented soybean meal (FSM) on the growth performance, liver and serum biochemical, flesh quality and metabolomics of tiger puffer (Takifugu rubripes). Five diets with FSM supplementation to replace 0 (control, FM), 15 % (FSM15), 30 % (FSM30), 45 % (FSM45) and 60 % (FSM60) FM were used to feed tiger puffer (39.6 ± 0.2 g) for 60 days. The results indicated that FSM could effectively replace up to 30 % of FM in diets without adverse impacts on weight gain (WG) and feed conversion ratio (FCR). In contrast, WG declined by 17.7 % and 33.6 %, and FCR increased by 0.22 and 0.55 in the FSM45 and FSM60 groups, respectively (P < 0.05). Compared to FM group, the contents of total fatty acids (TFA), C16:0, C22:6, total amino acids (TAA), Val, Ile and the activities of superoxide dismutase (SOD) and glutathione peroxidase (GPx) in flesh were significantly decreased, while the contents of collagen in flesh and alkaline phosphatase (ALP) in serum were significantly increased in FSM60 group (P < 0.05). In addition, FSM45 and FSM60 groups exhibited significantly higher the contents of total free amino acid (TFAA), flavor amino acid (FAA), Glu, Gly and Cys in flesh and alanine aminotransferase (ALT) in serum and lower liver cholesterol (CHO) levels compared to FM group (P < 0.05). 157 and 190 named metabolites were identified in FSM30 and FSM60 groups, respectively, compared to the control, and these metabolites were primarily involved in “lipid metabolism” and “amino acid metabolism”. In summary, in a diet containing 450 g/kg FM, FSM could replace FM up to 30 % without compromising the growth, serum and liver biochemical, flesh amino acids and fatty acids of tiger puffer. The optimum replacement level of FM with FSM was 31.79–32.48 % by broken-line based on WG and FCR.

Lucilene Santos Silva, Flaviane Alves de Pinho, Lidiany Viana Pires et al.

ABSTRACT Canine monocytic ehrlichiosis and canine thrombocytic anaplasmosis, caused by Ehrlichia canis and Anaplasma platys, are endemic diseases in Brazil. This study aimed to determine the occurrence of these pathogens in 224 dogs at a Veterinary Teaching Hospital in Piauí, northeastern Brazil. DNA samples were analyzed using PCR assays for E. canis and A. platys, followed by sequencing and phylogenetic analysis. Clinical data were collected from medical records. A total of 17.9% of the dogs (40/224) were positive for E. canis, 30.8% (69/224) for A. platys, and 16.5% (37/224) for both. Ticks were present in 50% of the dogs infected with E. canis, 59.4% with A. platys, and 62.2% with both bacteria. Common clinical and laboratory changes included lymphadenopathy, anemia, thrombocytopenia, hyperglobulinemia, and hypoalbuminemia. The partial 16S rDNA gene sequences of E. canis and A. platys from dogs in Piauí showed 99% to 100% and 99.74% identity to reference sequences from different regions of Brazil and other countries in GenBank, respectively. Phylogenetic analysis revealed that the sequences were grouped into their respective clades. This study represents the first molecular survey and phylogenetic characterization of these bacteria in dogs in the semiarid region of Piauí.

Mausam Budhathoki, Sezgin Tunca, Raquel López Martínez et al.

Aquaculture has been recognised for achieving multiple United Nations Sustainable Development Goals; its further growth depends on understanding, and responding to, societal perceptions in a broader context. Thus, this study aims to understand societal perceptions of aquaculture through a scoping review and media analysis. A scoping review identified 151 academic studies for inclusion in our five identified research clusters: (1) social acceptability, (2) growth and development, (3) media coverage, (4) sustainable aquaculture, and (5) consumer perceptions. Further, newspaper articles (n = 100) were sampled from the United Kingdom, Denmark, France, Spain, Turkey, and China; elsewhere all articles identified were included (Poland, 79; Hungary, 29; India, 70). The findings suggest that scientific and newspaper articles tend to present sustainability aspects in a simplified form. Key stakeholder groups include fish farming enterprises, civil society, governmental officials, scientists, and business leaders both within aquaculture value chains (retailers/wholesalers, technology industry) and outside of them (fisheries, tourism). Also, other stakeholders included the public (indigenous groups, residents, consumers). The stakeholder groups perceived aquaculture differently and depending on the circumstances and context, their perceptions ranged from positive to negative. Many factors influenced their perceptions, including aquaculture's impact on multiple sustainability dimensions, knowledge, transparency, personal interests, types, and location of aquaculture practises, regulations, experience, and sociodemographic characteristics such as age, gender, education, and income. We recommend that aquaculture practitioners focus on context‐specific multifaceted strategies—prioritising transparency, communication, and accountability—and provide essential knowledge to ensure that societal perceptions of aquaculture are based on accurate, empirical information.

Savely G. Karshenboim

We consider the angle in mathematics and arrive at a conclusion that there are two concepts on the issue. One is a descriptive geometrical one, while the other is from functional analysis. They are somewhat different, allow for different options, and both are legitimate and in use. Their difference may cause certain confusions. While the `geometrical angle' allows for different choice of units, the `functional angle' is a purely dimensionless one, being related to the angle in radians. We consider possible options to resolve the problem as it concerns the units.

Chao Wang, Yufeng Gong, Fuchang Deng et al.

Lipids play a crucial role in a range of physiological processes, with a particular significance during the early development stages. However, our understanding of lipid remodeling in cold-water salmon species during these critical early developmental phases remains limited. To address this, a comprehensive lipidomic study was conducted using rainbow trout (Oncorhynchus mykiss) as a model and four critical developmental stages were selected for analysis (i.e., newly fertilized eggs, eyed stage, post-hatch sac-fry stage, and swim-up stage). As expected, our results demonstrated significant lipid alterations during early development of rainbow trout. Through fuzzy c-mean clustering analysis, our study further provided a detailed description on the dynamic changes and regulation of the lipidome. Most unsaturated phosphatidylcholines (PCs) excluding very long-chain polyunsaturated PCs and all polyunsaturated triacylglycerols (TGs) were continuously consumed, suggesting that they are the major energy sources and/or precursor substances for early-stage development in rainbow trout. Gradual increases in very long-chain polyunsaturated phosphatidylethanolamines (PEs) and PCs, phosphatidylserines (PSs), as well as saturated and monounsaturated sphingomyelins (SMs) were observed in this study, which may closely associate with retina and brain development, and the myelination process. Additionally, diacylglycerol (DG), a well-known second messenger, displayed continuous synthesis throughout embryogenesis in this study. In addition to the abovementioned lipid dynamics, our study also found distinct patterns of change in certain glycerophospholipids (GP) isomers, while all glycerolipid (GL) isomers exhibited consistent trends in alteration, indicating different GP isomers may have different biological functions or activities for early development. Overall, this study emphasized the significant roles of lipids during the early development of rainbow trout and served as an informational data set for fish development-related research.

Saifuddin Rana, Md. Nazmul Hasan, Abdulla Al Bari et al.

The study was carried out in Matiranga Upazila, Bandarban district, which is considered one of Bangladesh's major hill tract regions. The study aimed to identify present farming conditions, prospects, and problems and suitable solutions to the problems of fish farming. Different participatory rapid appraisal tools such as focus group discussion, field visits, and farmers' interviews were used to collect relevant fish farming information in the study area. The polyculture method was the most practised aquaculture method. Among the selected farms, eleven fish species were identified as culture species. The transportation cost for seeds purchased from remote areas was high (11% of total seed cost). The average transportation-related mortality of fish fry and fingerlings was 7.2% and 2.8%. Feed cost was found as the major cost (58.4%) in aquaculture. Costs and revenue for fish production per decimal varied from BDT 311 to 3528 and BDT 23 to 1268. Utilization of vacant lake, youth and women engagement, integrated aquaculture, the desire of people to engage in aquaculture, and available human resources were found as significant prospects. The major problems identified were lack of hatchery, high feed cost, lack of stakeholder linkage, lack of capital for fish farming, and lack of proper knowledge, guidelines, and consultancy for fish culture. A community-based aquaculture model was proposed to overcome the present challenges and problems in the study area. The model may help to expand aquaculture and thus improve the livelihood and socio-economic status of the people of the hilly areas of Bangladesh.

G. Ainsworth, P. Pita, C. Pita et al.

The United Nations (UN) Decade of Ocean Science highlights a need to improve the way in which scientific results effectively inform action and policies regarding the ocean. Our research contributes to achieving this goal by identifying practical actions, barriers, stakeholder contributions and resources required to increase the sustainability of activities carried out in the context of artisanal fisheries to meet UN Sustainable Development Goals (SDG) and International Year of Artisanal Fisheries and Aquaculture (IYAFA) Global Action Plan (GAP) Pillar targets. We conducted a novel ‘social value chain analysis’ via a participatory workshop to elicit perspectives of value chain actors and fisheries stakeholders associated with two Spanish artisanal common octopus ( Octopus vulgaris ) fisheries (western Asturias—Marine Stewardship Council [MSC] certified, and Galicia—non-MSC certified) about their priorities regarding sustainable octopus production and commercialization. Our adapted Rapfish sustainability framework emphasised the importance of economic, environmental, ethical, institutional, social, and technological indicators to different actors across the value chain. We mapped participants’ shared sustainability priorities (e.g. integrated fisheries management, knowledge-based management, product traceability) to six Rapfish indicators, seven IYAFA Pillars and twelve SDGs to reveal how our results can inform ocean policy and actions. This identified how certification incentives and other cooperative approaches can facilitate environmental, economic and social sustainability (e.g. value-added products, price premiums for producers, gender inclusive organisations); support IYAFA priority outcomes (raised awareness, strengthened science-policy interface, empowered stakeholders, partnerships); and help to achieve UN SDG targets (e.g. SDG 14.b, SDG 17.17). The results can inform actors, stakeholders and policymakers about how different actors contribute to efforts to achieve the SDGs and how to manage priorities for sustainable actions within artisanal fisheries and their value chains. We recommend inclusive and equitable participatory knowledge transfer and governance platforms as part of the UN Decade of Ocean Science and beyond where participants can create theories of change towards sustainability involving the development of multi-sectoral ocean policies framed at the level of the value chain and supported by appropriate governance structures. Graphical Abstract

E. Ogier, David C. Smith, Sian Breen et al.

Australia’s fisheries have experience in responding individually to specific shocks to stock levels (for example, marine heatwaves, floods) and markets (for example, global financial crisis, food safety access barriers). The COVID-19 pandemic was, however, novel in triggering a series of systemic shocks and disruptions to the activities and operating conditions for all Australia’s commercial fisheries sectors including those of the research agencies that provide the information needed for their sustainable management. While these disruptions have a single root cause—the public health impacts and containment responses to the COVID-19 pandemic—their transmission and effects have been varied. We examine both the impacts on Australian fisheries triggered by measures introduced by governments both internationally and domestically in response to the COVID-19 pandemic outbreak, and the countermeasures introduced to support continuity in fisheries and aquaculture production and supply chains. Impacts on fisheries production are identified by comparing annual and monthly catch data for Australia’s commercial fisheries in 2020 with averages for the last 4–5 years. We combine this with a survey of the short-term disruption to and impacts on research organisations engaged in fisheries monitoring and assessment and the adaptive measures they deployed. The dominant impact identified was triggered by containment measures both within Australia and in export receiving countries which led to loss of export markets and domestic dine-in markets for live or fresh seafood. The most heavily impact fisheries included lobster and abalone (exported live) and specific finfishes (exported fresh or sold live domestically), which experienced short-term reductions in both production and price. At the same time, improved prices and demand for seafood sold into domestic retail channels were observed. The impacts observed were both a function of the disruptions due to the COVID-19 pandemic and the countermeasures and support programs introduced by various national and state-level governments across Australia to at least partly mitigate negative impacts on harvesting activities and supply chains. These included protecting fisheries activities from specific restrictive COVID-19 containment measures, pro-actively re-establishing freight links, supporting quota roll-overs, and introducing wage and businesses support packages. Fisheries research organisations were impacted to various degrees, largely determined by the extent to which their field monitoring activities were protected from specific restrictive COVID-19 containment measures by their state-level governments. Responses of these organisations included reducing fisheries dependent and independent data collection as required while developing strategies to continue to provide assessment services, including opportunistic innovations to harvest data from new data sources. Observed short run impacts of the COVID-19 pandemic outbreak has emphasised both the vulnerability of fisheries dependent on export markets, live or fresh markets, and long supply chains and the resilience of fisheries research programs. We suggest that further and more comprehensive analysis over a longer time period of the long-run impacts of subsequent waves of variants, extended pandemic containment measures, autonomous and planned adaptive responses would be beneficial for the development of more effective counter measures for when the next major external shock affects Australian fisheries.

H. Froehlich, J. Koehn, Kirstin K. Holsman et al.

Food production is one of the main contributors to climate change, but is also vulnerable to the resulting stressors, which is well documented for agriculture and fisheries. Attention is now turning to the rapidly growing aquaculture sector and its vulnerability to a changing climate. Here we explore the extent to which climate stressors and aquaculture, and concomitant adaptation strategies, are studied in science and addressed in public media (news) to assess focus and attribution of climate change. We reviewed 553 scientific publications and 228 news media articles on climate stressors, impacts, and adaptation approaches with respect to aquaculture. Re-sults indicate that coverage in the scientific community of climate stressors on aquaculture have not kept pace with growth of production in the sector, especially compared to agriculture and fisheries. Temperature, sea level rise, and ocean acidification were most often the focus in science (44%) and news (42%), suggesting some alignment. Combined coverage tended to revolve around Asia, Europe, and North/Central America (70%) and at least 10 countries ’ science and news linked current impacts on aquaculture to climate change. The majority of scientific articles addressing adaptation were regional rather than global, and emphasized governance and institutional strategies over technological solutions. In all, this research highlights the comparatively nascent focus of climate change implications for aquaculture, narrow emphasis of stressors, but fairly representative coverage of regions with more aquaculture. Our work highlights the need for more research and public awareness of the social and ecological climate change threats and impacts on, and adaptive strategies for aquaculture.

Alamrew Eyayu, A. Getahun, J. Keyombe