Aquaculture, Fish and Fisheries最新文献

{"title":"Impact of Lupin and Grass Pea Mixture Meal as Dietary Inclusion on Body Composition and Haematological Parameters of Nile Tilapia Fingerlings in a Recirculation Aquaculture System","authors":"Tsegay Fisseha,&nbsp;Akewake Geremew,&nbsp;Tadesse Fetahi,&nbsp;Kasim Abass","doi":"10.1002/aff2.70073","DOIUrl":"https://doi.org/10.1002/aff2.70073","url":null,"abstract":"<p>The study investigated the effects of fishmeal replacement with a mixture of lupin and grass pea meal (LGM) at inclusion levels of 0%, 25%, 50% and 75% as potential plant protein sources in the diets of Nile tilapia fingerlings on body composition and haematological parameters. Experimental diets were formulated to be iso-nitrogenous (36 g 100 g⁻¹), iso-lipidic (10 g 100 g⁻¹) and iso-energetic (18 kJ g⁻¹), fed at 6%–10% of their body weight per day. A total of 276 fingerlings with an average initial body weight of 1.37 ± 0.06 were stocked into four treatments, each in triplicate, using a completely randomized design for 12 weeks. Results showed no significant differences (<i>p</i> &lt; 0.05) in Hct, RBCs, WBCs and MCV across all LGM diet levels. However, an increasing trend of Hb, MCH and MCHC has been shown by fishes fed with LGM75. MCH and MCHC values decreased in groups fed LGM25 and LGM50 compared to the control and LGM75. MCV did not show significant differences with higher LGM protein levels. The differential WBC count of Nile tilapia fingerlings was dominated by lymphocytes (% mm⁻³), and lymphocytes, monocytes, neutrophils and eosinophils were identified, but basophils were not counted. Monocyte and eosinophil counts were not significantly different (<i>p</i> &lt; 0.05) from the control diet. Fish fed LGM75 and LGM50 had higher HSI than those on the control and LGM25, with an increasing trend observed at higher LGM protein levels. LGM proteins have positively influenced carcass composition, haematological parameters and growth, suggesting improved overall health, vitality and a cost-effective fishmeal alternative. Furthermore, successful uses of LGM proteins lead to healthier fish populations, improved resilience against diseases, survival rates and a more sustainable aquaculture. These feed ingredients can support fish farmers and contribute to affordable and accessible feed alternatives supporting a sustainable aquaculture industry. Overall, there are promising nutritional and haematological justifications for replacing fish meal with LGM protein sources in Nile tilapia diets.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"5 3","pages":""},"PeriodicalIF":1.1,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70073","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144091690","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Performance Comparisons for Artificially Propagated and Wild Pacific Lamprey Juveniles and Larvae","authors":"Kinsey Frick,&nbsp;Mary L. Moser,&nbsp;Theresa Liedtke,&nbsp;Lisa Weiland,&nbsp;Alexa N. Maine,&nbsp;Aaron D. Jackson","doi":"10.1002/aff2.70070","DOIUrl":"https://doi.org/10.1002/aff2.70070","url":null,"abstract":"<p>Artificially propagated Pacific lamprey (<i>Entosphenus tridentatus</i>) are produced for restoration and for use in dam passage studies to reduce the demand for wild fish. Such uses require that animals are representative of their wild counterparts. Previous work indicated that this is true for Pacific lamprey larvae and juveniles reared in the hatchery with respect to the length of sustained swimming. However, more subtle differences in behaviour and performance that lamprey need to survive have not been assessed. In this study, artificially propagated and wild fish were compared in laboratory tests under no-flow conditions to examine light avoidance, burrowing speed, burst swim speed, volitional routine swim speed and time to come to rest. Most larvae burrowed in less than a minute, and we found highly significant differences (<i>p</i> &lt; 0.001) between artificially propagated and wild larvae burrowing times, a critical escape behaviour. This could have implications for studies of larval entrainment at irrigation diversion canals or in turbine boils at dams. Interestingly, all of the wild juveniles tested came to rest quickly after introduction to the chamber (1.5 min), while artificially propagated lamprey swam robotically near the surface and 48% did not come to rest in the first 10 min (median time to rest = 9.5 min). In contrast, wild juveniles quickly (median = 1.47 min) sought areas near the tank bottom and attached strongly with their oral disc. Such behavioural differences could have important survival consequences for artificially propagated lamprey as they approach turbine intakes, bypass screens and irrigation diversion headgates. This study highlights the need to conduct behavioural assays that examine subtleties of fish behaviour that can be missed with traditional swim tunnel comparisons.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"5 3","pages":""},"PeriodicalIF":1.1,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70070","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144085198","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cyclical short-term fasting and refeeding effects on immunological alteration of the disk abalone, Haliotis discus discus","authors":"Dien Arista Anggorowati,&nbsp;Liqing Zang,&nbsp;Yutaka Tamaru,&nbsp;Takahiko Aoki,&nbsp;Fumiyoshi Okazaki","doi":"10.1002/aff2.70061","DOIUrl":"https://doi.org/10.1002/aff2.70061","url":null,"abstract":"<p>Starvation is a frequent challenge for many animals in their natural habitats. In aquatic ecosystems, certain fish and shellfish experience prolonged and short-term starvation stress, particularly during periods of extreme weather in the wild and inadequate feeding practices in aquaculture systems. Nutritional deficiencies caused by either short-term or prolonged starvation can lead to stress-induced health issues in fish and shellfish. Our study aimed to assess the impact of repeated short-term fasting and refeeding on immunological parameters and growth performance in the disk abalone, <i>Haliotis discus discus</i>. Abalones were randomly assigned to three distinct feeding patterns, with three replicates per group: Group I underwent continuous feeding for 35 days (CF), Group II experienced a repetitive cycle of 3-day fasting and 4-day refeeding for 35 days (PF) and Group III underwent no feeding for a 35-day period (NF). We measured survival and growth rate as well as analysed immunological parameters, such as total haemocyte count, phenoloxidase activity, respiratory burst activity, lysozyme activity and protein content across the groups. The results indicated that different feeding treatments impacted these immune responses differently across groups. Specifically, the group exposed to NF experienced a significant reduction in total haemocyte count (THC), respiratory burst activity and protein concentration, whereas phenoloxidase activity and lysozyme activity were highest in this group. The CF group showed no significant changes in respiratory burst activity, protein content, phenoloxidase activity and lysozyme activity. In contrast, the cycling short-term fasting and refeeding (PF) group exhibited higher lysozyme and phenoloxidase activities but had a lower THC. No differences were observed for respiratory burst activity and protein content in this group. This study demonstrated that the functionality of the innate immune system in abalone could be affected by nutritional status under starvation and refeeding.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"5 3","pages":""},"PeriodicalIF":1.1,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70061","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144074354","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Buffer Zone Degradation and Plankton Dynamics in Northern and Northeastern Parts of Lake Tana, Ethiopia: Implications for a Tropical Highland Lake Ecosystem","authors":"Degsera Aemro,&nbsp;Ayenew Masresha,&nbsp;Ayalew Wondie,&nbsp;Marishet Teshome,&nbsp;Dagnew Mequanent","doi":"10.1002/aff2.70072","DOIUrl":"https://doi.org/10.1002/aff2.70072","url":null,"abstract":"<p>Lake Tana, a UNESCO World Biosphere Reserve Lake. The lake contains 50% of Ethiopia's freshwater and fertile land, which favoured urbanization, agriculture and irrigation, impacting its ecosystem. Understanding the effects of buffer zone degradation on plankton and water quality was vital for sustainable resource utilization. Therefore, data collection was conducted from December 2020 to May 2021 in the buffered zone, two non-buffered zones, and the pelagic area of the northern and northeastern parts of Lake Tana twice a month. The study highlighted significant spatial variability in water quality and plankton composition, emphasizing the critical role of buffer zones for maintaining Lake Tana's health. Water temperature, dissolved oxygen (DO), Secchi depth, total dissolved solids (TDS) and nutrient concentrations varied significantly across sites, with degraded buffer zones (Seraba and Kirrigna) showing poorer conditions compared to buffered (Debresina) and pelagic areas. Phytoplankton communities were dominated by Chlorophyceae (46.15%), followed by Bacillariophyceae (30.77%), Cyanophyceae (19.23%) and Euglenophyceae (3.85%). <i>Microcystis</i> was the most abundant genus across all sites but was less prevalent in the buffer zone area. Zooplankton composition also varied significantly, with Rotifera dominating over Copepod and Cladocera. Chlorophyll-<i>a</i> (Chl-<i>a</i>) concentrations, an indicator of phytoplankton biomass, were highest in buffered and pelagic areas, showing positive correlations with DO and negative correlations with temperature and turbidity. Human activities significantly impacted water quality and plankton diversity, as evidenced by strong correlations with the human disruption assessment (HDA) score. Significant differences were observed between sites for most parameters, except temperature, oxygen content and zooplankton diversity. Mean Chl-<i>a</i> concentrations were higher in pelagic (2.64 µg/L) and Debresina (5.3 µg/L) compared to Seraba (2.34 µg/L) and Kirrigna (2.48 µg/L). These findings emphasize the urgent need for policymakers and stakeholders to protect and restore Lake Tana's buffer zones.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"5 3","pages":""},"PeriodicalIF":1.1,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70072","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143930296","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nature of Phytoplankton Communities in the Southern Hemisphere Shallow Lakes, With an Emphasis on the Presence of Submerged Aquatic Vegetation: A Review","authors":"Anton E. S. Patrick,&nbsp;Singarayer Florentine,&nbsp;Grant C. Palmer,&nbsp;Julie Mondon,&nbsp;Bradley D. Mitchell","doi":"10.1002/aff2.70068","DOIUrl":"https://doi.org/10.1002/aff2.70068","url":null,"abstract":"<p>Differences in the ecological stability of shallow lakes are reflected in the functional nature of the distinct phytoplankton communities in the Southern Hemisphere. Recent studies have highlighted growing uncertainties of the previous concepts regarding phytoplankton cosmopolitanism, suggesting these communities may be more regionally specialized. Consequently, the generalized applicability of traditional Northern Hemisphere-derived limnological principles can be challenged when applied to aquatic vegetation in the Southern Hemisphere. In this respect, informed comparisons among Southern Hemisphere phytoplanktonic community structures, trophic interactions and influence of submerged aquatic vegetation (SAV) on shallow lake are currently lacking. To redress this knowledge gap, a synthesis of available literature from inland water bodies of the Southern Hemisphere, including Antarctica, Australia, New Zealand, South Africa and South America, has been consolidated in this review to guide future research directions. Further, unique characteristics of Southern Hemisphere phytoplankton and SAVs, driven by global climate change and a multiplicity of anthropogenic stressors, require specific investigation to establish how such impacts have likely contributed to the observed endemic outcomes. The biogeographic framework and interactive—functional model to understand the complex interaction of factors contributing to alternative stable states in these freshwater systems has been represented.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"5 3","pages":""},"PeriodicalIF":1.1,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70068","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143919555","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spatial and Temporal Variation in the Life-History Traits of Yellow Perch (Perca flavescens) in the Canadian Waters of Lake Huron","authors":"Ryder J. Rutko,&nbsp;Richard G. Manzon,&nbsp;Joanna Y. Wilson,&nbsp;Christopher M. Somers","doi":"10.1002/aff2.70071","DOIUrl":"https://doi.org/10.1002/aff2.70071","url":null,"abstract":"<p>The yellow perch (<i>Perca flavescens</i>) is an economically important fish species in the Laurentian Great Lakes of North America. The largest commercial harvests occur in Lakes Erie and Huron. In the Canadian waters of Lake Huron, the yellow perch is managed based on 17 spatially distinct management units established decades ago. Despite being the basis for commercial harvest quotas, it is unknown if management units reflect current yellow perch population structure, or if yellow perch life-history traits changed following a major ecosystem shift associated with invasive mussels in the early 2000s. We calculated life-history trait parameter values (size at maturity, age at maturity, maximum size, lifespan and growth rate) for female yellow perch across the Canadian portion of Lake Huron in recent (2009–2018, 9264 fish) and historical (1990–1999, 3540 fish) timeframes. We spatially compared recent life-history trait values and found four discrete clusters of yellow perch driven by latitudinal variation in age at maturity and maximum size, and longitudinal variation in maximum size and lifespan. The depth of capture was an important influence on yellow perch growth rate. We compared recent and historical life-history trait values and found no temporal variation before and after dreissenid mussel invasion. Our findings demonstrate significant spatial variation in yellow perch life-history traits but, over spatial scales, much larger than the current management units. Correspondingly, life-history trait values alone are likely not sufficient for understanding population subdivision in the Canadian waters of Lake Huron.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"5 3","pages":""},"PeriodicalIF":1.1,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70071","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143919322","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Climate-Resilient Aquaculture: Recirculatory Aquaculture Systems–Based Seed Production for Heteropneustes fossilis in Bangladesh","authors":"Balaram Mahalder,&nbsp;Md. Naim Mahmud,&nbsp;Mst. Rabia Basori,&nbsp;Most. Israt Jahan Seba,&nbsp;Mst. Afrina Bintay Harun Shammi,&nbsp;Mohammad Abu Baker Siddique,&nbsp;A. K. Shakur Ahammad,&nbsp;Mohammad Mahfujul Haque","doi":"10.1002/aff2.70066","DOIUrl":"https://doi.org/10.1002/aff2.70066","url":null,"abstract":"<p>Aquaculture in Bangladesh heavily relies on hatchery-produced seeds but encounters climate change challenges. In an experimental study, two distinct recirculatory aquaculture systems (RAS) were employed: large-RAS (LRAS) and mini-RAS (MRAS). They were utilized for broodstock rearing, breeding, seed production and larval rearing of <i>Heteropneustes fossilis</i>, aiming to assess the overall suitability of RAS for seed production as an adaptation strategy in response to climate change. During the four-month rearing period in LRAS, both male and female fish showed significant increases in length, weight gain and specific growth rate, accompanied by higher survival rates, particularly in developing broodstock. Breeding of <i>H. fossilis</i> was characterized by high fertilization (95%) and hatching rate (98%). Following 27 days of rearing in MRAS and the aquarium, the larvae exhibited adult-like characteristics, showing an average length and weight of 2.6 ± 0.211 mm and 0.115 ± 0.088 g, respectively. By day 60 in LRAS, there was a notable increase in both the average length and weight of larvae to 6.55 ± 1.49 mm and 3.158 ± 0.64 g, accompanied by surface water air engulfment and heightened nocturnal activity. The relative condition factor (Kn) assesses the overall growth, health and well-being of fish by comparing the observed weight to the expected weight based on the length–weight relationship, with a Kn of 1.25 for larvae in LRAS, indicating favourable growth. Subsequent larvae rearing in MRAS jars, aquarium tank, and LRAS tank for 10, 20 and 30 days, respectively exhibited noticeable length and weight gain with higher specific growth rates. These findings highlight the effectiveness of RAS in optimizing broodstock development, enhancing seed production efficiency and ensuring the quality of <i>H. fossilis</i> seed under controlled conditions. Implementing RAS can significantly contribute to climate-resilient aquaculture, offering a sustainable solution for fish seed production in Bangladesh.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"5 3","pages":""},"PeriodicalIF":1.1,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70066","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143914523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Importance of Minerals and Their Bioavailability in Boosting Aquaculture: A Systematic Review","authors":"Francis Pius Mmanda","doi":"10.1002/aff2.70067","DOIUrl":"https://doi.org/10.1002/aff2.70067","url":null,"abstract":"<p>Fish like other terrestrial animals, have specific requirements for individual minerals that support the growth and maintenance of normal fish health and other biological functions among different cultured fish species. These minerals can be either macro or micro minerals that are supplied to the fish body through diets or absorbed from their surrounding environment via skins, gills or alimentary tract. However, the bioavailability of these minerals to the fish body is influenced by several factors, including the intake level of the nutrient, interactions with other minerals or nutrients and cultured fish species. To enhance effective bioavailability to the farmed fish, sustainable, healthy and well-mineral-balanced diets must be adopted to achieve better fish growth performance, and a high survival rate for high production and productivity while ensuring the resilience of the cultured environment. In this review, the quantitative mineral composition of different mineral sources was reviewed and reported. In addition, mineral requirements in several cultured fish both freshwater and marine water fish species for five macro minerals (calcium, phosphorus, sodium, potassium and magnesium) and seven micro minerals (zinc, iron, copper, manganese, iodine, chromium and selenium) were compiled and reported. Nile tilapia is dominating freshwater cultured species in Tanzania, followed by catfish and rainbow trout, while milkfish is dominating cultured marine species practiced along the coastline from the Northern Tanga region to the Southern Mtwara region. Moreover, this review also covers information on the relationship between minerals and farmed fish, the mechanism of mineral absorption in fish and implications associated with bioavailability of minerals in both aquatic animal body and their surrounding environment, as well as mineral research in future perspectives in the aquaculture industry development. Therefore, the review comprises all this information on the importance of minerals and their bioavailability in farmed fish for sustainable aquaculture production and productivity.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"5 3","pages":""},"PeriodicalIF":1.1,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70067","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143904888","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Future of Pathogen Detection in Aquaculture: Miniature Labs, Field-Compatible Assays, environmental DNA and RNA, CRISPR and Metatranscriptomics","authors":"Jessica Rieder,&nbsp;Anastasiia Berezenko,&nbsp;Alexandra Meziti,&nbsp;Irene Adrian-Kalchhauser","doi":"10.1002/aff2.70062","DOIUrl":"https://doi.org/10.1002/aff2.70062","url":null,"abstract":"<p>Inland recirculating aquaculture is a thriving food industry providing sustainable and locally sourced high-quality protein. However, its expansion is accompanied by emerging challenges regarding the spread of pathogens and diseases. Detection and management of pathogens in aquaculture remain underdeveloped compared to other animal farming sectors due to the vast diversity of species involved, the non-domesticated species and limited knowledge regarding pathogens, host responses and disease mechanisms. Furthermore, recirculating aquaculture systems are heavily dependent on beneficial bacterial communities for waste product removal and water quality maintenance, with opportunistic pathogens constituting an inherent component of these microbial communities. To enhance the potential of inland aquaculture as a sustainable source of protein, it is imperative to adopt advanced tools for pathogen detection and monitoring and for assessing the overall health of the microbial ecosystem.</p><p>This paper presents an overview of promising current molecular and technological advancements that offer solutions for pathogen detection and system monitoring in aquaculture. We focus on recently developed point-of-care and on-site detection methods using miniaturized laboratory equipment and robust workflows that operate independently of cold chain logistics. We explore current methodologies for monitoring pathogens in the environment rather than through fish health assessments. Lastly, we discuss techniques from other scientific disciplines in aquaculture, including CRISPR-Cas protocols for pathogen detection and the implementation of ‘omics’ approaches for the comprehensive characterization of microbial states.</p><p>These methods demonstrate considerable potential for pathogen surveillance and, subsequently, early responses in the dynamic aquaculture field. Through a better understanding of available options, aquaculture managers and molecular scientists can collaborate and optimize systems. This paper aims to facilitate communication between molecular scientists and aquaculture managers, equipping the aquaculture industry with knowledge to enhance pathogen management techniques in their facilities.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"5 3","pages":""},"PeriodicalIF":1.1,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70062","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of Spent Brewer's Yeast Inclusion as a Feed Additive on Nile Tilapia (Oreochromis niloticus) Production, Colour and Fillet Proximate Composition","authors":"Jonathan K Lee,&nbsp;Tammy Lee,&nbsp;Sharon Xin Ying Chuah,&nbsp;Rose Omidvar,&nbsp;Andrew Ropicki,&nbsp;Andrew J. MacIntosh,&nbsp;Razieh Farzad","doi":"10.1002/aff2.70065","DOIUrl":"https://doi.org/10.1002/aff2.70065","url":null,"abstract":"<p>While yeasts are often incorporated into aquafeed, research examining the impact of Spent brewer's yeast (SBY) often lacks consideration of associated hop acid constituents. Hop acids are important components of SBY, which differentiate it from other yeast derivatives and often limit their application due to bitter taste. The present study examined the relationship between SBY and its associated hop acid when incorporated into an aquafeed. The effect of SBY on the growth, lysozyme activity, colour and nutritional composition of Nile tilapia (<i>Oreochromis niloticus</i>) over a 10-week nutritional trial was assessed. Four treatment feeds were formulated: a control feed (CTRL) with no SBY or hop acids, a feed with 300 mg hop acids/kg (HA), a 12% SBY-supplemented feed (SBY) and a 12% SBY-supplemented feed with 300 mg hop acids/kg (SBY+HA). One hundred and forty-four fish were distributed into 12 tanks, with each tank randomly assigned one of the treatment diets. Key metrics such as weight gain, specific growth rate, feed conversion ratio, viscerosomatic index, hepatosomatic index, conditioning factor and fillet yield were assessed. Additionally, deboned fillets were evaluated for lightness, a and b(LAB) colour and proximate composition. The SBY-supplemented feed without hop acids (SBY) resulted in lower growth, compared to the control (CTRL). However, the HA feed showed improved growth, compared to the control. Small differences were noted in fillet colour, but no significant differences were found in proximate composition across treatments. This study suggests that SBY, enriched with hop acids, could be a valuable protein supplement in aquafeed, providing production benefits without affecting final fillet quality.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"5 2","pages":""},"PeriodicalIF":1.1,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70065","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143852721","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}