AbstractGood water quality in recirculating aquaculture systems (RAS) is crucial for ensuring the successful growth and survival of reared species. So far, there are no regulations for which parameters should be measured in RAS, and each farmer decides which parameters to follow. Traditionally, water quality parameters have been measured at certain intervals with handheld sensors and laboratory analyses, which can be labour intensive. Currently, a variety of sensors and monitoring equipment is available, even for the real‐time monitoring of water quality parameters. Internet of Things‐based systems and artificial intelligence can be applied for the monitoring purposes which allows real‐time measurements and warnings of critical situations. However, many of the modern systems need competent users and require regular maintenance and calibration. Changes in water quality also induces changes in fish behaviour, such as swimming activity, depth, acceleration and water quality can be assessed also based on these changes. In this review, water quality parameters, variety of sensors and monitoring technologies have been summarised to provide an overview of the current monitoring systems for water quality. Additionally, analytical methods for more advanced analyses have also been briefly summarised. Although there are several advanced options available for monitoring the basic water quality parameters, real‐time measurements of more advanced parameters still required require further development.
Dmitry Rudoy, Irina Tkacheva, Elena Ponomareva
et al.
The article is devoted to the development and study of an innovative method for modifying feed in aquaculture based on the use of activated sludge from biofloc technologies (BFTs). The study presents the results of an experimental study of two BFT systems created on the basis of different complexes of bacterial strains: probiotic strains (S1) and strains isolated from the bottom sediments of the Don River (S2). The effectiveness of floc-forming bacteria strains MT141 and MT142 is demonstrated, which increased the biomass of flocs within 7 days and increased the content by 5%. The dominant bacteria in the BFT, out of the total number of species, were representatives of the genus Runella (up to 33%) and the genus Exiguobacterium (up to 26%), and 20% of the floc community bacteria were groups of the Christensenellaceae R-7 group, the genus Acetoanaerobium, and the genus Bryobacter (up to 11%). The amino acid composition of the active sludge proteins in the BFT system contained a significant percentage of amino acids, such as valine, glycine, and leucine, which were comparable to the requirements for their content in crustacean feed. The effectiveness of the feed additive was evaluated on two aquatic species, Clarias gariepinus and Cherax quadricarinatus. Catfish raised using the BFT system showed high biomass growth, with a survival rate of 98% and a two-fold reduction in feed conversion ratio. Australian red claw crayfish consuming the experimental feed increased their average daily growth by 0.2%, and the protein content in their muscle tissue was three times higher than in the control group. The results of the study confirm the promise of using dried activated sludge meal as a safe and effective protein supplement for aquaculture feed.
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.
James L. Anderson, Frank Asche, Håkan Eggert
et al.
Abstract Aquaculture has been the primary engine driving increases in the global aquatic food supply for over three decades. Despite its undisputed success in terms of increased production, there has been considerable concern and criticism regarding various aspects of aquaculture, particularly in relation to environmental and social sustainability. However, there has been no method developed or data collected, that can be consistently used to compare aquaculture system performance along the three pillars of sustainability: environmental, economic, and social performance, or at finer scales. The Aquaculture Performance Indicators (APIs) are designed to address this major gap. The APIs adopt a very similar framework to the successful Fishery Performance Indicators (FPIs) and are designed to be comparable with the FPIs, particularly at the more aggregated levels. This work introduces the API approach and its implementation to date. Thus far, 69 API assessments have been conducted that are associated with over 40% of global aquaculture production quantity and 36% of global production value.
Size‐ and species‐selective harvest inevitably alters the composition of targeted populations and communities. This can potentially harm fish stocks, ecosystem functionality, and related services, as evidenced in numerous commercial fisheries. The high popularity of rod‐and‐reel recreational fishing, practiced by hundreds of millions globally, raises concerns about similar deteriorating effects. Despite its prevalence, the species and size selectivity of recreational fisheries remain largely unquantified due to a lack of combined catch data and fisheries‐independent surveys. This study addresses this gap by using standardised monitoring data and over 60,000 digital angling catch reports from 62 distinct fisheries. The findings demonstrate a pronounced selectivity in recreational fisheries, targeting top predators and large individuals. Catch‐and‐release practices reduced the overall harvest by 60% but did not substantially alter this selectivity. The strong species‐ and size‐specific selectivity mirror patterns observed in other fisheries, emphasising the importance of managing the potential adverse effects of recreational fisheries selective mortality and overfishing.
This study focuses on the Litopenaeus vannamei shrimp, exploring its development, dilemmas, and challenges in China’s industry alongside countermeasures implemented by Chinese authorities and agencies. Since its introduction to China in 1988, L. vannamei, known for its high economic value and adaptability, has become China’s leading mariculture shrimp species and one of the most significant globally. The thriving L. vannamei industry has boosted economic gains and job creation in China’s marine fisheries, supplied high-quality protein to consumers, and fostered socio-economic growth. Additionally, China’s experiences and lessons in the L. vannamei industry serve as valuable references for other shrimp-farming nations, promoting global industry health. Despite its success, the industry faces challenges, including germplasm resource scarcity, feed ingredient shortages, disease management, and wastewater treatment. To address these issues, China has initiated various strategies, including germplasm resource conservation, the development of low-fishmeal protein feeds, disease monitoring, and wastewater management, aiming for the industry’s green and sustainable evolution. This paper asserts that China’s initiatives in advancing the L. vannamei industry offer significant inspiration globally, particularly in two main areas: Firstly, through effective policy support, China has fostered research and development of new shrimp varieties suited to its aquaculture conditions, enhancing germplasm quality and breeding efficiency. Secondly, China has actively disseminated its innovations, outcomes, and experiences globally, hosting various aquaculture training sessions and seminars. These initiatives offer technical support and platforms for international dialogue, fostering cooperation and exchange among shrimp farming nations. Moreover, China’s dedication to advancing artificial culture technology for L. vannamei—through collaborative and continuous research across breeding, nutrition, disease management, and sustainability—has led to significant industry advancements. These contributions not only extend the industry chain but also position China as a leader and model for global shrimp aquaculture innovation. Through this study, we aim to offer insights and practical advice by analyzing the challenges and responses within China’s L. vannamei industry. We hope these findings will serve as valuable references for enhancing the global shrimp aquaculture industry and aid other nations in their aquaculture endeavors.
Joseph T. Mrnak, H. Embke, Maxwel V Wilkinson
et al.
Managing fisheries in a changing socio-ecological environment may require holistic approaches for identifying and adapting to novel ecosystem dynamics. Using 32 years of Ceded Territory of Wisconsin (CTWI) walleye (Sander vitreus) data, we estimated production (P), biomass (B), biomass turnover (P/B), yield (Y), and yield over production (Y/P) and tested for hyperstability in walleye yield. Most CTWI walleye populations showed low P, and B, and Y/P 1) was prevalent among Wisconsin walleye recruitment-based management approaches (natural recruitment [NR], sustained only by stocking, combination). Production, B, and P/B have declined in NR populations, while Y and Y/P have remained constant. Walleye Y was hyperstable along a production gradient among all management approaches and fishery types (i.e., angling only, angling/tribal harvest combined). Diminishing productivity and hyperstable yield may be jointly contributing to observed walleye declines. We classified lakes into management groups of low, moderate, or high vulnerability to harvest based on Y/P and P/B dynamics and recommend that exploitation may need to decline to maintain or increase the adaptive capacity of CTWI walleye.
Climate‐smart agriculture (CSA) has been promoted in Kenya as a panacea for climate change impacts on agricultural productivity. Consequently, various climate‐smart aquaculture technologies, innovations, and management practices (CSA‐TIMPs) have been developed, validated, and adopted through the Kenya Climate‐Smart Agriculture Project (KCSAP). Nevertheless, there has been no evaluation of the climate‐smartness of the CSA‐TIMPs for priority setting. In this study, we evaluated and ranked the CSA‐TIMPs using a modified Climate‐smart Agriculture Prioritization Framework (CSA‐PF). The prioritization process included multistakeholder validation workshops involving researchers, fisheries officers, farmers, traders, and policy makers. The climate‐smartness scores of the CSA‐TIMPs were given based on the CSA pillars (i.e., adaptation, mitigation, and productivity) under various climate‐smartness indicators, with a score ranging from −10 (for a negative impact) to +10 (for a positive impact). This resulted in the identification and documentation of forty (40) CSA‐TIMPs. Climate‐smartness scores varied from 3.8 to 6.1, with higher values indicating strong synergies between the CSA pillars, with productivity having the highest average score of 6.4. The top 5 list of CSA‐TIMPs with the best synergies among the CSA pillars was then developed for prioritization. Adoption of these CSA‐TIMPs would be instrumental in achieving the CSA triple wins, especially in improving aquaculture productivity. Therefore, sustained efforts in stakeholder engagement, capacity building, and policy support are essential to ensure the successful adoption of CSA‐TIMPs in Kenya. A dynamic approach that includes continuous validation, comprehensive monitoring and evaluation, and an enabling environment for adoption will be key to achieving sustainable and scalable impacts.
María de Jesús Contreras‐García, Wilfrido M. Contreras‐Sánchez, M. Mendoza‐Carranza
Common Snook (Centropomus undecimalis) is widely distributed across the tropical Atlantic Coasts and has a significant economic impact. This review aims to assess the knowledge status of common snook, contributing significantly to the development of sustainable aquacultural practices. The review was conducted using Web of Science and Google Scholar to identify scientific articles analysing the biology and ecology, the status of snook fisheries and developments in aquaculture production. Researchers in the USA, Mexico and Brazil have conducted 37.95%, 25.52% and 26.21% of published research, respectively, focusing mainly on reproduction in natural environments, status of fisheries and aquaculture production. From an environmental perspective, it is essential to understand the factors impacting C. undecimalis populations. Climate change effects and human alterations to river courses pose significant threats. In addition to fishing regulations, there is a promising potential for further fisheries research and to deepen the understanding of the life cycle to support the implementation of sound aquacultural practices to replenish exploited stocks and to develop commercial aquaculture. Currently, C. undecimalis populations in Mexico and the United States are overexploited, focusing on México, which now has a management plan. Advances in controlled reproduction and larval development have been made. However, many challenges remain unclear, such as larval conditions that continue to represent a bottleneck to block continuous and large‐scale aquaculture production, larval nutrition, disease management and culture systems. However, aquaculture holds the potential to enhance the sustainability of this species by reducing fishing pressure and aiding population recovery.
Luis Héctor Hernández Hernández, Madison S. Powell, Susana Alejandra Frías Gómez
et al.
The cinnamon river shrimp (Macrobrachium acanthurus) is distributed along the Atlantic Ocean, from the United States to Brazil. This species represents important resources for local communities of fishermen, but natural populations are facing a progressive decline. For several years, the aquaculture supplementation of this species has been suggested as an alternative to fisheries. M. acanthurus presents several characteristics that make it a suitable species for aquaculture, such as resistance to changes in environmental conditions, reproduction all year round, high fecundity, low aggressivity, and disease resistance. Despite this, the development of culture is, at best, at the stage of research and has been related to the difficulty of the larval stage rearing. Considering this, the review presents the actual knowledge regarding the environmental and biological conditions of M. acanthurus that might help to advance its culture. The information is presented in several parts, which include the species description, environmental conditions, reproduction, larvae and juvenile stages, culture experience, and diseases. Finally, some considerations are given to cover the gaps in the knowledge that are required to be researched.
Ahmad Farhadi, A. Vazirzadeh, Andrew G. Jeffs
et al.
Abstract Spiny lobster species are ecologically important and highly prized as seafood globally. Populations of spiny lobsters have been impacted by overfishing, the harvesting of juveniles for seeding aquaculture, the spread of virulent disease, and declines in recruitment and natural habitat. Many spiny lobster populations cover vast geographic ranges, maintained via ocean-going larval dispersal, which makes effective management challenging. Determining the genetic structure and phylogeographic boundaries are important in fisheries and aquaculture for defining appropriate units for management or breeding. Nevertheless, the common patterns of biogeographic distribution and connectivity of spiny lobster populations are generally not well understood. This review summarizes recent genetic advances in our understanding of these patterns and presents several meta-analyses to help discern the common processes driving them. Due to the probable link between biogeographic patterns among species and phylogeographic patterns within species, the spatial patterns of recent genetic stock divergence were investigated with the assistance of a new comprehensive and time-calibrated phylogeny for palinurids. Meta-analyses of biogeographic and phylogeographic patterns were used to identify common patterns of genetic stock divergence. A model is proposed that synthesizes the current understanding of the common processes of divergence of palinurid genetic lineages, emphasizing the importance of allopatry, ecological adaptation, and changing patterns of connectivity over time. Overall, the results highlight the importance of major biogeographic boundaries in structuring spiny lobster stocks over a broad scale, while oceanographic features and stochasticity dominate at smaller scales. These insights will assist the management of spiny lobster fisheries and aquaculture development, by better identifying and understanding the genetic units expected to be most appropriate for management and breeding, even in those species that have not yet received intensive genetic study.
This study evaluates the effects of valine on the growth, digestion, antioxidant capacity, and intestinal health of triploid rainbow trout (Oncorhynchus mykiss) fed a low fish meal diet (10 %). The trouts with an initial body weight of 15.08±0.20 g were fed with five different isonitrogenous and isoenergetic diets containing levels of valine: 0.86 % (G1), 1.79 % (G2), 2.43 % (G3), 3.02 % (G4), and 3.68 % (G5) for 56 days. The results showed that the weight growth rate and specific growth rate of the 2.43 % group were significantly higher than those of the 0.86 % control group (P<0.05). The intestinal villus length and muscle layer thickness propria were significantly increased in the 3.02 % group compared to the control group (P<0.05). The activities of intestinal protease, amylase, superoxide dismutase, catalase, and lysozyme in the 2.43 % group were significantly higher than those in the control group (P<0.05). The levels of interleukin-8 and tumor necrosis factor-alpha were lowest in the 3.02 % group, while the IL-10 level was highest in the 3.02 % group (P<0.05). Elevated levels of valine in the dietary regimen correlated positively with the upregulation of pivotal genes associated with antioxidant mechanisms, notably nuclear factor erythroid 2-related factor 2 (Nrf2), NAD(P)H: quinone oxidoreductase 1 (NQO1), and thioredoxin (Trx). Additionally, the expression of genes implicated in the synthesis of tight junction proteins, including occludin, claudin 7b, and claudin 15, exhibited significant augmentation with escalating valine concentrations in the feed. In conclusion, dietary valine enhanced the growth, digestive and absorptive capabilities, antioxidant capacity, and intestinal health of O. mykiss. An analysis based on a quadratic curve model, which incorporates specific rates of growth and weight gain, establishes that the optimal dietary valine requirement for triploid O. mykiss consuming a 10 % fish meal diet ranges between 2.43 % and 2.69 %.
Simeulue Regency has the potential for diverse and abundant marine resources; one of which is octopus (Octopus sp.). However, the problem faced by Simeulue fishermen in carrying out octopus fishing activities is that they only rely on natural phenomena or natural signs studied from generation to generation (traditional) to catch octopus. Therefore, the catch obtained is uncertain and takes a long time. The purpose of this study was to determine the number and weight of octopus catches landed in three sub-districts namely Teupah Barat, Teupah Selatan and Alafan, and then make a map of distribution of potential octopus fishing groud in the three sub-districts. The research method used in this study was a survey method by observing octopus catching units. The results showed that the total number and total weight of octopus catches in three sub-districts from the highest to the lowest were Teupah Barat, amounting to 176 heads and weighing 90,47 kg; Teupah Selatan amounting to 115 heads and weighing to 69,54 kg; and Alafan amounting to 114 heads and weighing to 46,97 kg, where the octopuses caught were all adult categories and fit to be caught. As for the potential areas for octopus fishing in the three sub-districts were as follows: Teupah Barat with 3 potential areas (points E, F and A); Teupah Selatan with 2 potential areas (points E and F); Alafan with only 1 potential point (point K).
Keywords:
Mapping
Fishing ground
Octopus
Simeulue
Suzan Attia Mawed, Mervat H. Ghoneim, Mayada R. Farag
et al.
Recently, nanomaterials including alumina have been extensively involved in aquaculture for many purposes resulting in potential hazards in fish. However, its effect on the developing metabolic organs and lipid metabolism remains unclear. This study, investigated the effects of aluminium nanoparticles (AL-NPs) on the metabolic organs of the growing zebrafish larvae including intestine, liver, and pancreas in addition to the potential ameliorative role of rosmarinic acid (RA) against AL-NPs - induced toxicity. Briefly, fertilized zebrafish eggs were divided into 4 groups. The 1st group was kept as a control. The 2nd group was exposed to RA (0.5 mg/L). The 3rd group was exposed to AL-NPs (160 mg/L). The 4th group received both RA and AL-NPs at the same concentrations from 1st day post fertilization (dpf) till the 14th dpf. Here, AL-NPs exposed group showed the highest mortality rate, external morphology defects and gastrointestinal malformations after larval-to-juvenile transition. Interestingly, mixing RA to AL-NPs significantly reduced these effects. Additionally, AL-NPs induced intestinal epithelium defects at the histological and genetic levels and abnormal lipid retention via up-regulation of the lipogenesis-related genes and down-regulation of the hepatic fatty acid β-oxidation. However, addition of RA to AL-NPs could reverse these effects. AL-NPs also induce inflammatory response and mediated endoplasmic reticulum ER and cellular oxidative stress indicated by qRT-PCR and western blot analysis which were then be reduced by RA. Collectively, AL-NPs were highly correlated with the induction of steatohepatitis and lipogenesis after the larval-to-juvenile transition and this could be relief in the presence of RA suggesting it as a promising nutrient for fish.
We demonstrate metasurfaces with strong polarization dichroism that depends on the angle of incidence. We present original designs obtained through topology optimization that selectively transmit specific linear or circular polarizations at different incident angles, while the orthogonal polarization transmission is suppressed. The designed metasurfaces exceed 95% transmission efficiency and 50x extinction ratio within the target angle ranges. The experimental characterization of fabricated metasurfaces confirms the desired operation with 90% transmission efficiency and 10x extinction ratio. These results provide important insights to non-local and k-space engineering of metasurface response and results reveal new opportunities for future multi-functional and angle-selective polarization devices that can find applications in specialized optical instruments and end-user devices.