Aquaculture Technology Research Articles

A Review on Biofloc System Technology, History, Types, and Future Economical Perceptions in Aquaculture.

Given the scarcity of water and land resources, coupled with the competitive nature of aquaculture, the long-term viability of this industry will depend on strategies for vertical development. This involves enhancing production environments, increasing productivity, and advancing aquaculture technologies. The use of biofloc technology offers a potential solution to mitigate the adverse environmental impacts and the heavy reliance on fishmeal in the aquaculture sector. This method is designed to effectively assimilate inorganic nitrogen found in aquaculture wastewater, thereby enhancing water quality. Additionally, this process produces microbial protein, which can serve as a viable supplemental feed for aquatic animals. Furthermore, this technique has the potential to reduce the feed conversion ratio, thereby lowering overall production costs. This article provides an overview of the evolving field of biofloc system technology within aquaculture. In this study, we will examine the historical development and various types of biofloc systems, as well as the factors that influence their effectiveness. Finally, we will explore the economic potential of implementing biofloc systems in aquaculture.

Improvement of Immune Defense and Survival of Grouper Fish (Ephinepelus sp.) Using the Immuno-Probiosirkulasi System (SI-PBR) Method in Semi-Intensive Ponds in Brondong, Lamongan

Grouper (Epinephelus sp.) is a marine fishery commodity that is widely cultivated in marine cages and ponds. The export market demand for grouper fish continues to increase every year by 30.75% every year, so there is a need for improvement, through various technological applications. The main obstacle in cultivating grouper fish in ponds is the decline in water quality and disease attacks, which can cause up to 100% crop failure, just 3 – 5 days after infection. One effort that can be implemented is the cultivation method with the Immuno-Probiocirculation System (SIPBR). Brondong sub-district is one of the areas in Lamongan which has large fisheries potential, especially for breakwater water pools, which are the top among other districts. There have been many cases of grouper deaths in ponds to date, which are caused by disease attacks and water quality. The aim of this community service activity is to apply the Immuno-Probioculation System fish aquaculture technology in traditional plus pattern ponds (SI-PBR), increasing grouper fish production in Lamongan Regency, East Java. Observational method which includes socialization / counseling, planning and guidance for implementing SI-PBR technology in one period (three months). These results show positive indications. There is an increase in farmer knowledge, the SI-PBR method can reduce ectoparasite infestation and increase grouper yields from 272.43 kg / ha to 87.66 kg / ha, meaning an increase of 334%. The conclusion from this activity is that the SI-PBR model can increase fish production and can be applied in wider areas in the Lamongan region.

Advances in the application of stereo vision in aquaculture with emphasis on fish: A review

AbstractThe effective implementation of machine vision has played a crucial role in advancing intelligent aquaculture across various domains. Stereo vision, as a branch of machine vision, has become a mainstream technology in aquaculture. Its distinctive capability to conduct comprehensive underwater monitoring from multiple angles, unaffected by object occlusion has propelled it to the forefront of aquaculture applications. This article offers a comprehensive review of the diverse applications of stereo vision in aquaculture spanning from its inception to present. The exploration encompasses its role in crucial areas such as biomass estimation and behavioural analysis, which include fish counting, weight estimation, swimming behaviour, feeding behaviour and abnormal behaviour. Furthermore, the paper delves into the advantages of stereo vision over traditional 2D machine vision approaches, while also acknowledging limitations, and identifying future challenges that must be addressed to fully leverage its potential in aquaculture. The review emphasizes the prospect of advancement in deep learning stereo‐matching algorithms specifically designed for underwater environments to catalyse a breakthrough in stereo vision technology. In summary, this review aims to provide researchers and practitioners with a better understanding of the current development of stereo vision in aquaculture, optimizing stereo vision technology and better serving the aquaculture field.

Nanoparticles‐based double‐stranded RNA delivery as an antiviral agent in shrimp aquaculture

AbstractThe review encapsulates the comprehensive exploration of RNA interference technology's application in shrimp aquaculture, covering molecular intricacies, production methods, and practical applications. The emphasis is on exploring the stability and delivery of gene‐specific double‐stranded RNA, particularly through nanoencapsulation. This is because the susceptibility of dsRNA to degradation and limited cellular penetration, emphasising the need for effective delivery mechanisms. The review presents an in‐depth exploration of nanoparticles for the encapsulation and delivery of dsRNA, including virus‐like particles (VLPs), and non‐viral based nanoparticles such as liposomes, chitosan, and beta‐glucan. VLPs, derived from non‐infectious shrimp virus structures, exhibit biocompatibility and natural functionality, making them suitable carriers for dsRNA. The application of chitosan and its derivatives are explored for their efficacy in reducing viral infections in shrimp. Beta‐glucan particles are examined for their immunostimulant properties in shrimp aquaculture. The text emphasises the use of yeast‐based glucan particles for encapsulating dsRNA, showcasing their potential in preventing viral diseases in shrimp. The review introduces cautionary considerations for nanoparticle formulation, highlighting factors such as pH, organic solvents, metal ions, and environmental ribonuclease that can impact dsRNA stability during synthesis. In conclusion, the text discusses the potential economic worthiness and environmental risk assessment of dsRNA technology in shrimp aquaculture. While acknowledging successful applications in other environments, it underscores the need for regulatory approval and risk assessment for dsRNA‐based products in the aquaculture industry. The evaluation of dsRNA in real‐world shrimp farms is deemed necessary for commercial utilisation, taking into account income, expenses, safety, and environmental considerations.

Production tests of a sorption feed additive for rainbow trout

Against the backdrop of intensification of aquaculture technologies, the severity of deterrent factors is increasing; among the most relevant in this issue, the quality of feed should be noted, the low level of which creates the risks of feed poisoning, metabolic disorders and the initiation of disease development. In the conditions of fish farms, research was carried out to study the safety and effectiveness of using a sorptionmetabolic feed additive for fish, developed by employees of the Federal State Budgetary Educational Institution of Higher Education of St. Petersburg State University of Internal Affairs and EcoGroup LLC (Russia). The object of the study was rainbow trout, which during the growing period for 60 days received feed with the specified additive. Statistical processing of the results obtained using the Statistica 8.0 program included the calculation of the arithmetic mean and its standard error (M±m), and the intergroup difference (p) was assessed using the student’s t test. The results of the study showed that the developed feed additive does not have a negative effect on the fish body, and its use eliminates the occurrence of metabolic disorders and the development of liver and kidney pathologies, the risk of which increases with the intensification of aquaculture technology. Against the backdrop of giving a new feed additive, not only does the weight and body size of the fish increase, but its growth potential during periods of further cultivation increases. Thus, the developed sorption-metabolic feed additive is harmless to fish, has a positive effect on their growth and development, and reduces the risks of metabolic disorders and the development of pathologies. All this provides grounds for the use of this feed additive in aquaculture.

Biofloc technology in aquaculture: Advantages and disadvantages from social and applicability perspectives – a review

Abstract The world aquaculture industry seeks sustainable production strategies to respond to the needs of the growing world population for valuable food. Biofloc technology (BFT) is accepted as a novel sustainable method that reduces the pollution load on receiving water resources with its zero-water-discharge approach, eliminates extra water treatment costs with its biological cycles, and supports the growth performance of reared animals and thereby reduces feed costs. However, each BFT system has its own set of difficulties and obstacles. This review focuses on the advantages and disadvantages of BFT systems in terms of economy, sociability and applicability. The BFT shows more effective results in the conversion of toxic nitrogenous compounds to nontoxic compounds compared with the technologies based on nitrification processes. In addition, the growth performance and health of the cultured animals are generally better in BFT systems than those in conventional rearing systems (continuous water flow). The risk of common diseases occurrence due to pathogenic microorganisms appears to be lower in BFT systems compared to conventional aquaculture. It is also noteworthy that the immune system, biochemical stress indicators and antioxidant activities of organisms held in BFT systems are positively affected. In BFT systems based on microbial activity, the high water temperature demanded by bacteria is a limiter for the system. Moreover, a higher aeration/energy requirement is the case in BFT to meet the oxygen demand of all organisms including fish, shrimp, heterotrophic bacteria, nematodes, rotifers and others inside. There is also another concern about the acceptability potential of the cultured organism in BFT systems for consumption. Finally, since the high temperature demand of the system will create high energy costs, it should be considered as another restriction that forces the application. Considering the advantages and disadvantages of BFT systems as sustainable aquaculture, this review provides a guide for future studies and full-scale implementations.

Вплив згодовування пробіотика «Субалін» на показники продуктивності гібрида осетрових (Acipenseridae) бестера першого року вирощування з використанням теплої скидної води енергетичної установки

Purpose. To assess the effect of supplementing the feeds with the probiotic “Subalin” on the productive parameters of bester on the first year of cultivation using waste water from an energy installation (power plant) under conditions of elevated water temperature. Methodology. The study was conducted in 2023 in the conditions of an industrial-type farm “Biosila” created on the basis of warm waste water of a thermal power plant. Growing of age-0+ bester was carried out for 65 days in plastic tanks. They were fed with compound feeds manufactured by a well-known European manufacturer with a crude protein content of 54% and crude fat content of 15%. In addition to the main diet of the fish, a probiotic based on Bacillus subtilis “Subalin” was introduced at the rate (% of the weight of the feed): 0.02 (variant 1); 0.03 (variant 2); 0.04 (variant 3); 0.05 (variant 4). In the control variant of the experiments, the fish received the same compound feed without the probiotic. The stocking density of fish with an initial average weight of 22.8 g in all variants of experiments and control was 100 individuals in each tank (about 56 ind./m2). Determination of productive parameters and study of physico-chemical factors of the environment were carried out according to generally accepted methods. Findings. During the cultivation period of bester, water temperature fluctuated between 23.8–32.5°C. For 39 days, water temperature exceeded 30°C, which is uncharacteristic for sturgeon aquaculture. The content of dissolved oxygen varied from 4.0 to 5.7 mg O2/dm3. Other hydrochemical parameters met the requirements for growing sturgeons. As a result of intensive breeding, bester juveniles in various experimental variants reached an average weight of 166.8 to 195.4 g. In the control, it was 145.4 g, which was 12.8–25.6% less than in the experimental groups of fish. In all variants of the experiments and control, fish survival rate was 100%. The fish productivity of tanks was in the range of 6838.9–9588.9 g/m2. The highest productive parameters of bester were obtained in the variant where their main feed was supplemented with “Subalin” at the amount of 0.04% of the weight of the compound feed. Originality. The results of the use of probiotic “Subalin” as a supplement of the main feed of bester juveniles in the conditions of an industrial-type farm with the use of heated waste water from a power plant were studied. Practical value. The results are of interest for the development of sturgeon aquaculture technologies in the conditions of industrial-type farms, primarily with the use of secondary energy resources in thermal power generation. Keywords: sturgeon, bester of the first year of cultivation, industrial fish farming, feed, probiotic “Subalin”, productivity parameters.

Gluconeogenesis in the extraembryonic yolk syncytial layer of the zebrafish embryo.

Yolk-consuming (lecithotrophic) embryos of oviparous animals, such as those of fish, need to make do with the maternally derived yolk. However, in many cases, yolk possesses little carbohydrates and sugars, including glucose, the essential monosaccharide. Interestingly, increases in the glucose content were found in embryos of some teleost fishes; however, the origin of this glucose has been unknown. Unveiling new metabolic strategies in fish embryos has a potential for better aquaculture technologies. In the present study, using zebrafish, we assessed how these embryos obtain the glucose. We employed stable isotope (13C)-labeled substrates and injected them to the zebrafish embryos. Our liquid chromatography-mass spectrometry-based isotope tracking revealed that among all tested substrate, glutamate was most actively metabolized to produce glucose in the zebrafish embryos. Expression analysis for gluconeogenic genes found that many of these were expressed in the yolk syncytial layer (YSL), an extraembryonic tissue found in teleost fishes. Generation 0 (G0) knockout of pck2, a gene encoding the key enzyme for gluconeogenesis from Krebs cycle intermediates, reduced gluconeogenesis from glutamate, suggesting that this gene is responsible for gluconeogenesis from glutamate in the zebrafish embryos. These results showed that teleost YSL undergoes gluconeogenesis, likely contributing to the glucose supplementation to the embryos with limited glucose source. Since many other animal lineages lack YSL, further comparative analysis will be interesting.

Chemical recovery of a fish farm in Jinju Bay of South Korea after cessation of long-term fish farming

The development of aquaculture technology has led to significant increases in aquaculture production, which has deteriorated the coastal environment. This study is the first to conduct sedimentary environment recovery monitoring of an aquaculture environment using chemical indicators in a fallow fish farm in South Korea. The total organic carbon concentration in the surface sediments (≤2 cm) decreased to the control level within 1 year; the acid volatile sulfide concentration was not recovered for 3 years and 10 months. Nutrient and sulfide concentrations were high in deep sediments (≤15 cm) because of continuous fish farming for over 20 years and accumulation of organic matter beneath the cages. Complete chemical recovery of this study area may take a longer time than previously anticipated. Overall, this study provides significant insights for implementing coastal management plans and estimating adequate fallowing periods during long-term fish farming.

ASSESSMENT OF PHYSICOCHEMICAL PARAMETERS OF WATER IN AN INDUSTRIAL SCALE IN POND RACEWAY SYSTEM

The In-pond raceway system is a highly sophisticated innovative aquaculture technology. Many research has been done on the physicochemical characteristics of water. The present study was conducted to measure the physicochemical parameters of water in an In-Pond Raceway System (IPRS). The study employed standard and instrumental methods to investigate a range of physicochemical parameters, including water temperature, pH, DO, TDS, conductivity, ammonia, nitrite, and phosphate. One-way Analysis of Variance was conducted to calculate the variation of physicochemical parameters among the study sites. Statistical analysis showed there was no significant variation of physicochemical parameters (p>0.05) among the experimental sites except DO and ammonia (p<0.05). The experimental study showed that, all the key physicochemical parameters water in IPRS production zone were within the optimum ranges when compared with standard water quality parameters which is the prerequisite to introduce maximum survivability of fish production in IPRS system.

Artificial Intelligence-Based Aquaculture System for Optimizing the Quality of Water: A Systematic Analysis

The world population is expected to grow to around 9 billion by 2050. The growing need for foods with high protein levels makes aquaculture one of the fastest-growing food industries in the world. Some challenges of fishing production are related to obsolete aquaculture techniques, overexploitation of marine species, and lack of water quality control. This research systematically analyzes aquaculture technologies, such as sensors, artificial intelligence (AI), and image processing. Through the systematic PRISMA process, 753 investigations published from 2012 to 2023 were analyzed based on a search in Scopus and Web of Science. It revealed a significant 70.5% increase in the number of articles published compared to the previous year, indicating a growing interest in this field. The results indicate that current aquaculture technologies are water monitoring sensors, AI methodologies such as K-means, and contour segmentation for computer vision. Also, it is reported that K means technologies offer an efficiency from 95% to 98%. These methods allow decisions based on data patterns and aquaculture insights. Improving aquaculture methodologies will allow adequate management of economic and environmental resources to promote fishing and satisfy nutritional needs.

Modeling the Adoption of Aquaculture Technologies among the Members of 4-H Club Youth

Aquaculture farming in the country Philippines has played a vital role concerning employment and food security for every Filipino. This article aimed to look into a piece of information that explicate the factors of aquaculture technology adoption among the 4-H club youth members. The study uses primary data gathered from selected members of 4-H club youth in Southern Leyte, Philippines. Standard descriptive measures were calculated to characterize and describe the collected information and a statistical model were engaged to capture the significant predictors of the adoption of aquaculture technologies among youth. Results revealed that there are only a few (10.17%) of the youth members are adopting aquaculture technology. The members are neutral on their perception of aquaculture technology concerning complexity, economically viable, and environmentally safe. In addition, they disagree on the compatibility and minimal risk of the said technology. The regression model reveals that older adults (p-value<0.1), males (p-value<0.1), and higher income (p-value<0.05) are more likely to adopt the technology. The inverse effect from 4-H coordinator influence (p-value<0.05) and environmental safety characteristics (p-value<0.1) was found in the model regarding adopting the technology. Moreover, youth members are likely to adopt the technology if it is economically viable (p-value<0.05) to them. Hence, it is concluded that if the technology is affordable and understood by the farmers, there is a strong likelihood that they will adopt it in their respective places. The study suggests that the local government must support and implement more training and workshop for aquaculture technology to encourage and educate more youth.

The Influencing Factors Analysis of Aquaculture Mechanization Development in Liaoning, China

Promoting the mechanization of aquaculture is one of the most important supporting measures to ensure the high-quality development of the aquaculture industry in China. In order to solve the problems of predominantly manual work and to decrease the costs of aquaculture, the influencing factors of China’s aquaculture mechanization were systematically analyzed. The triple bottom theory was selected, and three aspects were identified, including environmental, economic, and social aspects. Through the literature review, the Delphi method, and the analytic hierarchy process, the comprehensive evaluation indicator system, including 18 influencing factors, was proposed. Moreover, the fuzzy comprehensive evaluation method was combined with the model to solve the evaluation results. A case study in Liaoning Province was offered and, according to the analysis results, the economic aspect at the first level was the most critical factor; the financial subsidy for the purchase of aquaculture machinery, the energy consumption of the machinery and equipment, and the promotion and use of aquaculture technology were the most important factors and had the greatest impact on the development of aquaculture mechanization in China. The effective implementation paths and countermeasures were proposed, such as the promotion of mechanized equipment and the enhancement of the machinery purchase subsidies, in order to provide an important decision-making basis for the improvement of the level of aquaculture mechanization.

Rapid Detection of the Aeromonas sp. group using Conventional PCR at the Aquaculture Technology Development Center, Cangkringan, Sleman, Special Region of Yogyakarta

The catfish is a freshwater cultivated fish that can be found all over Indonesia. However, the problems that occur in general are usually attacks by pathogens from the Aeromonas sp group. This research aims to optimize the rapid detection of the Aeromonas sp group using PCR at the Aquaculture Technology Development Center, Cangkringan, Sleman, special region of Yogyakarta. The research was conducted by survey with purposive sampling. Isolation was carried out using two growth media, namely Tryptone Soy Agar (TSA) and Glutamate Starch Phenile (GSP). Colonies that had characteristics of the Aeromonas sp group were subjected to PCR amplification using specific primers for the Aeromonas sp group. The results of the amplification resulted in DNA that matched the target, namely 953bp, which showed that the sample belonged to the Aeromonas sp group. Based on this technique, the level of accuracy in detecting pathogens is higher than conventional methods.

Shrimp industry in China: overview of the trends in the production, imports and exports during the last two decades, challenges, and outlook

China’s shrimp farming industry has experienced significant growth in recent years. With such a development, some major constraints linked to the industry’s sustainable development have emerged. This paper aims to present an overview of China’s shrimp industry over the last two decades, with special attention to farm-raised shrimp both in marine and inland waters. Documentary research on its recent evolution was carried out based on data collected from China Fishery Statistics Yearbooks 2003 to 2022 coupled with data from FAO. Findings indicated that there has been an upward trend in China’s total shrimp production over the last 20 years, with a growth rate of 120%, representing an average annual growth rate of 4.3%. The observed higher shrimp production was driven by expanded shrimp aquaculture production, with major species dominated by the Pacific whiteleg shrimp (litopenaeus vannamei), the black tiger shrimp (Penaeus monodon), the Chinese shrimp (Penaeus chinensis), and the Japanese prawn (Penaeus japonicus). Challenges associated with the intensification of the production and the driven environmental deterioration need to be properly addressed. First, the shrimp farming industry should be practiced while considering both environment and ecosystem protection. Applying such an organic farming principle presupposes some practices for addressing the existing issues threatening the sustainable growth of the industry. To that end, there is a need for innovative techniques that should be strengthened. Second, possible solutions to shrimp disease problems, namely prevention, early diagnosis, and various control techniques, should also be developed and improved, with an emphasis on the former. In addition, encouraging the use of good-quality feed in appropriate quantity and form is also of paramount importance. It is thus worth noting that further policies need to focus on promoting a large range of ecological shrimp aquaculture technologies that should be encouraged among farmers.

Performance of juvenile vaname shrimp (Litopenaeus vannamei) hemocyte cells number and differentiation in different cultivation technologies

The Performance from The Number and Differentiation of Haemocyte Cell of udang vaname (Litopenaeus vannamaei) . Juvenile on Reared with Different Aquaculture Technology. This study aims to assess the performance of the number of hemocytes and cell differentiation of juvenile Udang vannamei (Litopenaeus vannamei) on reared with different levels of technology. The research was conducted by sampling directly to the location of intensive pond and traditional pond. The sampling frequency is 2 times at intervals of 15 days during the juvenile Litopenaeus vannamaei ± 2 months old. Hemolimfe parameters measured were the number of hemocytes, whereas the percentage of hemocytes differentiation by type of cell. The results showed that an increase in the number of juvenile litopenaeus vannamaei hemocytes on monitoring at 16:30, respectively rose from 30×106 cells/ml in traditional pond, and 34.8×106 cells/ml in intensive pond. at 12:00 monitoring, became 68.7×106 cells/ml traditional pond and 64.8×106 cells/ml in intensive pond. Furthermore, cell hyalin is higher percentage (54-61%) on traditional pond than globular cells (33-35%) and cell semiglobular (7-14%), but in intensive pond, globular cells is higher between hyaline cells and globular cells at each monitoring for 24 hours. This fact shows that the condition of vitality juvenile litopenaeus vannamaei reared on traditional pond more vibrant than litopenaeus vannamaei juveniles reared in intensive pond allegedly prone to stress, especially at dawn (4:30 a.m).

A Novel Lightweight Underwater Fish Individual Recognition Method Based on Local Feature Guidance Training for Precision Aquaculture

Highlights This article proposed a novel lightweight underwater fish individual recognition method. The proposed method can fully learn the characteristic information of fish. This method can guide training through local features. During prediction, only the global branch is utilized, resulting in a small number of parameters. Abstract. Individual recognition of fish within aquaculture fish groups is crucial for monitoring the growth status of each fish and is a key technology for precision and green aquaculture. However, accurately recognizing fish faces challenges due to the significant variations in fish postures and the influence of complex environments. This article aims to present a highly accurate method for underwater fish individual recognition, offering technical support for intelligent fish farming. To achieve this goal, a novel lightweight underwater fish individual recognition method based on local feature guidance training was proposed for precision aquaculture in this study. The method designs a multi-scale network based on deep learning and utilizes SE_ResNext for feature extraction. This network consists of a branch representing the global feature and a branch representing the local feature. During training, the full image of the fish individual is inputted as a coarse scale to the global branch (G-branch) to learn the global feature and calculate the ID loss. The image of each part formed after segmenting the fish individual is inputted as a fine-scale input to the partial branch (P-branch) to learn the local feature. Subsequently, the global feature and local feature are combined to form the fusion feature, and the Triplet loss and ID loss are calculated on the fusion feature. Finally, the loss calculated in the global feature and the loss calculated in the fusion feature are weighted and summed to obtain the total loss. Through the design of the loss function, the global feature is consistently influenced by the local feature, and the local feature serves to guide the global feature. During prediction, the global feature, having learned the information from the local feature, allows for the sole utilization of the G-branch to recognize fish individuals. This approach significantly reduces the number of parameters and computational requirements, resulting in a lightweight network. The method achieves high accuracy, with both Rank-1 and Rank-5 accuracy rates surpassing 95%. Remarkably, even with low image resolution and slight obscuration of the fish body, the Rank-1 accuracy remains above 90%. Keywords: Deep learning, Multi-scale network, Object detection, Recognition of fish individual.

Three-dimensional ecological breeding mode and key technology of fish-frog symbiosis

This paper introduces the mode and key technology of fish-frog symbiosis. Pond fish-frog aquaculture technology is on the basis of conventional pond fish, through the pond, the implementation of bullfrog without land farming, pond fish-frog symbiotic system, realize the pond fish-frog stereo culture, the method has covers an area of less, low cost, enemy, breeding density, bullfrog, fast growth, easy to manage, high comprehensive benefit advantages.

Результати отримання ікри від вперше дозрілих плідників осетра (Acipenser baerii Brandt, 1869), вирощених в індустріальних умовах

Purpose. To determine and evaluate productive parameters in the process of artificially obtaining ovulated eggs in different seasons from brood Siberian sturgeon Acipenser baerii Brandt, 1869 at first maturity grown in conditions of floating cage systems with a natural water temperature of the forest-steppe of Ukraine. Methodology. The material for the study were 65 individuals of age-8+ to 10+ sturgeon females with a body weight of 6.02‒8.64 kg firstly used in breeding works, which were grown using intensive technology in floating cages installed in a water body with a natural temperature regime of the forest-steppe zone. Experiments on obtaining mature eggs were conducted in non-traditional breeding periods — in winter (February) and at the end of spring (the last decade of May). In the winter, a recirculation aquaculture system was used with the use of special methods of preparing brood fish in the process of obtaining mature eggs. Collection of ovulated eggs was carried out with the preservation of life of brood fish after hormonal stimulation of gonad maturation using a carp pituitary preparation. Determination of productive parameters and study of physicochemical factors of the environment were carried out according to generally accepted methods. Findings. In different seasons of the year at a water temperature of 14–21°C, high efficiency of gonad maturation was registered in both groups of brood fish. The average weight of mature eggs obtained in separate groups of sturgeon females was 1.02–1.15 kg with an average gonadosomatic index of 13.92–15.42%. 94–97% of fish responded to pituitary stimulation in different groups of brood fish. The duration of brood fish maturation after the second (decisive) injection with a total dose of a gonadotropic substance of 3.5–4.0 mg/kg of fish weight varied within 14–25 hours. The survival rate of brood fish after egg collection was close to 94%. Originality. The results of obtaining mature eggs from Siberian sturgeon (Acipenser baerii) females at first maturity using the industrial fish farming technology, which is not common for aquaculture in Ukraine, were determined and analyzed. Practical value. The study results are of interest for the development of modern sturgeon aquaculture technologies in the conditions of industrial-type farms, primarily for the organization of caviar production. Keywords: brood sturgeon (Acipenser baerii), industrial fish farming, oocyte ovulation, productive parameters, caviar production.

Vulnerability assessment of the fishery system in China’s coastal provinces since 2000

Coastal fishery systems are vital for both the environment and the economy, and at present, they face heightened vulnerability due to global climate change and natural disasters. A clearer understanding of the challenges that the system presents can be obtained by examining the vulnerabilities of fishery systems. This study employed a vulnerability scoping diagram framework and a multi-indicator approach combined with the entropy weight method for assigning weights to systematically evaluate the vulnerabilities of fishery systems in China’s coastal provinces. The spatiotemporal variation characteristics of vulnerability were analyzed and characterized, and the primary obstacles that affect vulnerability are discussed. The findings suggest that China’s coastal provinces’ fishery systems display vulnerability in terms of both time and space. From a temporal perspective, Liaoning, Hebei, and Shandong provinces exhibited an increasing trend in vulnerability, while Tianjin, Jiangsu, Zhejiang, Shanghai, Fujian, Guangdong, Guangxi, and Hainan showed decreasing trends. From a spatial perspective, Hainan and Liaoning’s fishery systems exhibited extremely high vulnerability in most years. In contrast, Tianjin consistently experienced extremely low vulnerability in most years. From the perspective of obstacles, the main factor was the funding for the extension of aquaculture technology, and this remained the primary obstacle factor across all years. The findings are significant for enhancing our understanding of vulnerability in fishery systems and for strengthening disaster prevention and mitigation measures. The results provide robust support for the improvement of management and the protection of fishery systems.