Aquaculture, Fish and Fisheries最新文献

{"title":"Health Monitoring of Invasive Pink Salmon Oncorhynchus gorbuscha in Norway in 2023","authors":"Åse Helen Garseth,&nbsp;Lisa Furnesvik,&nbsp;Kristoffer Vale Nielsen,&nbsp;Anne Berit Olsen,&nbsp;Julie Christine Svendsen,&nbsp;Torfinn Moldal","doi":"10.1002/aff2.70020","DOIUrl":"https://doi.org/10.1002/aff2.70020","url":null,"abstract":"<p>Since 2019, the Norwegian Veterinary Institute (NVI) has conducted health monitoring of pink salmon in Norway. The primary purpose of health monitoring has been to examine the presence of selected notifiable infections in pink salmon, but also to gain general knowledge regarding the health of pink salmon to inform assessments of risks to wild and farmed native salmonids. In 2023, post-mortem examinations were performed on 184 pink salmon captured in rivers Lakselv, Tana, Neiden, Komagelva, Kongsfjordelva and Karpelv in the County of Finnmark, Norway. Tissue samples from 161 of these were analysed with specific PCR assays aimed at detecting infectious salmon anaemia virus (ISAV), viral haemorrhagic septicaemia virus (VHSV), infectious hematopoietic necrosis virus (IHNV), piscine orthoreovirus genotype 1 (PRV-1) and <i>Renibacterium salmoninarum</i>. In addition, cultivation methods were applied to detect the presence of cultivable virus and bacteria. ISAV, VHSV, IHNV PRV-1 and <i>R. salmoninarum</i> were not detected by PCR. Furthermore, <i>R. salmoninarum, Aeromonas salmonicida</i> subsp. <i>salmonicida</i> and cultivable virus were not detected by cultivation. With the exception of the absence of PRV-1, the results correspond to previous years' health-monitoring projects.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"4 6","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70020","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142861844","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 Effect of Prey Size and Prey Density on Paralarval Feeding Success of the Common Sydney Octopus, Octopus tetricus","authors":"Jeffrey Good,&nbsp;Andrew Jeffs,&nbsp;Stefan Spreitzenbarth","doi":"10.1002/aff2.70028","DOIUrl":"https://doi.org/10.1002/aff2.70028","url":null,"abstract":"<p>Global demand for octopus seafood has been increasing over the past 30 years. This demand is projected to increase further as coastal communities and seafood consumers seek alternative sources of protein as finfish stocks decline. The establishment of a sustainable octopus aquaculture would have the potential to alleviate fishing pressures from wild populations. Commercial-scale octopus aquaculture, however, has not been achieved due to the difficulty of successfully rearing octopus paralarvae on an efficacious diet. This study investigated the prey size and density preferences of <i>Octopus tetricus</i> paralarvae to understand the characteristics that improve food acquisition during rearing. Groups of octopus paralarvae from multiple broods were observed for a range of feeding behaviour including positioning, attack, capture loss, successful capture and handling time when given different treatments of <i>Artemia</i> prey. Prey size experiments used treatments of <i>Artemia</i> with total lengths of &lt; 0.5, 0.9–1.0 and 1.4–1.6 mm, while prey density experiments used 0.2, 0.6, 1.0, 1.4, 1.8 and 2.2 <i>Artemia</i> mL⁻¹. Increased numbers of successful feeding behaviours (e.g., positionings, attacks and successful captures) were directly observed with increasing prey size. Octopus paralarvae performed 52% more positionings, 100% more attacks and 175% more successful captures when given large <i>Artemia</i> (1.4–1.6 mm) than when given small <i>Artemia</i> (&lt; 0.5 mm). Likewise, the number of observed successful feeding behaviours tended to increase with increasing <i>Artemia</i> density but sharply decreased at the highest density treatment (2.2 <i>Artemia</i> mL⁻¹). Paralarvae performed up to 109% more positionings, 307% more attacks and 300% more successful captures when given prey densities of 1.0–1.8 <i>Artemia</i> mL⁻¹ than when given lower prey density treatments and 2.2 <i>Artemia</i> mL⁻¹. The results from this study indicate that prey size and density are crucial for the successful feeding of octopus paralarvae. Based on the greatest numbers of successful feeding behaviours, <i>O. tetricus</i> paralarvae prefer prey between 1.4 and 1.6 mm in length and at densities between 1.0 and 1.8 prey mL⁻¹. The use of these optimal prey characteristics can be used to promote efficient paralarval octopus prey capture and feeding to greatly increase food intake in octopus paralarvae when reared in aquaculture.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"4 6","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70028","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142861846","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":"Unlocking Potential Benefits on Applications of Probiotics in Inland Aquaculture Industry: A Review","authors":"Kelvin E. Vulla,&nbsp;Francis P. Mmanda,&nbsp;Baraka P. Nyangoko,&nbsp;Edna E. Makule","doi":"10.1002/aff2.70027","DOIUrl":"https://doi.org/10.1002/aff2.70027","url":null,"abstract":"<p>Inland aquaculture operations are practised all over the world, contributing about 62.6% of all farmed aquatic animals. This venture is increasing worldwide and outpacing the global market demand for fish and fishery products driven by competition with other animals, over-population and over-exploitation of wild capture fisheries. These operations expand globally, associated with the degradation of the culture environment due to poor aquaculture management practices and algal blooms due to nutrient influxes as well as high demand of quality fish feeds of affordable price. To overcome these challenges, sustainable, healthy and environmentally friendly alternatives including probiotics application must be adopted to achieve better production, profitability and productivity as well as a resilient culture environment. In this review, information on potential applications of probiotics in aquaculture (inland aquaculture) focused on sources, safety, approved probiotics for aquaculture, characteristics of probiotics, mode of applications and its potential use on pathogenic microbes control, fish haematological parameters, growth performance and stress responses, water quality parameter, anti-nutritional factors and feed digestibility, limitation of using probiotics in aquaculture and lastly future perspectives on the probiotics application in aquaculture industry were reviewed and compiled for future sustainable aquaculture production and productivity and environmentally friendly. The review has also highlighted all probiotics application and their approved authority for use in farmed freshwater fish (Nile tilapia <i>Oreochromis niloticus</i>, Catfish <i>Clarias gariepinus</i>, rainbow trout <i>Oncorhynchus mykiss</i> and common carp <i>Cyprinus carpio</i>) and their cultured environment worldwide. Therefore, the review has comprised all information on the potential benefits application of probiotics in an inland aquaculture for public documentation and also identifies gaps in the aquaculture industry that require further research and assessment.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"4 6","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70027","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142861455","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":"Growth Performance of Asian Seabass (Lates calcarifer, Bloch) in Relation to Stocking Density: Initial Results From Seabass Culture in Open Sea Floating Net Cages in the Cox's Bazar Coast, Bay of Bengal, Bangladesh","authors":"Md. Golam Mostofa,&nbsp;Saima Sultana Sonia,&nbsp;Shafiqur Rahman,&nbsp;Mritunjoy Paul,&nbsp;Mohammad Khairul Alam Sobuj,&nbsp;Shanur Jahedul Hasan,&nbsp;Md. Zulfikar Ali,&nbsp;Anuradha Bhadra","doi":"10.1002/aff2.70025","DOIUrl":"https://doi.org/10.1002/aff2.70025","url":null,"abstract":"<p>The study aimed to assess the impact of stocking density on the growth performance, survival rate and production of seabass (<i>Lates calcarifer</i>) fingerlings in floating net cages conducted at the Maheshkhali Channel, Cox's Bazar, Bangladesh. A triplicate group of seabass, with an average initial weight of 86.82 ± 1.9 g, was randomly stocked in floating net cages at densities of 15, 12, 10 and 8 fish m⁻³, referred to as <i>T</i>₁₅, <i>T</i>₁₂, <i>T</i>₁₀ and <i>T</i>₈, respectively. The fish fingerlings were supplied with freshly chopped sardine (<i>Sardinella fimbriata</i>) at 10% of their body weight for 4 months and 5% for 2 months, administered twice daily. The water quality metrics were measured fortnightly. The initial and the final proximate composition of seabass was not significantly different (<i>p &gt;</i> 0.05). Upon completion of the experiment on the 180th day, the growth performance and additional measures, including final body weight, weight gain (WG), percent weight gain (PWG), specific growth rate (SGR), feed conversion ratio (FCR), feed efficiency ratio (FER), survival rate and total production, were assessed. Comparisons of growth and yield demonstrated that fish stocking density significantly (<i>p</i> &lt; 0.05) influenced growth and productivity. Fish cultivated at maximum density (<i>T</i>₁₅) exhibited lower mean weights than those raised at lower densities. This study demonstrated that <i>T</i>₁₀ had better results for all growth and other metrics examined, indicating the appropriateness of this density. Therefore, it may be inferred that seabass exhibits optimal growth at a stocking density of 10 fish m⁻³ along the coast of Cox's Bazar, Bangladesh.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"4 6","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70025","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142861194","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":"Liver Structure and Function in Yellowtail Kingfish, Seriola lalandi, in Response to Reduced Fish Meal Diets","authors":"Benjamin H. Crowe,&nbsp;James O. Harris,&nbsp;Todd J. McWhorter,&nbsp;Matthew S. Bansemer,&nbsp;David A. J. Stone","doi":"10.1002/aff2.70026","DOIUrl":"https://doi.org/10.1002/aff2.70026","url":null,"abstract":"<p>Alterations to lipid storage, and the consequent effects on liver structure, need to be considered when replacing wild-derived fish meal (wd-FM) with alternative ingredients in formulated diets for commercially aquacultured species. The replacement of wd-FM is likely to alter the available level of precursors for bile acid production, potentially impacting the absorption of dietary lipids and fat-soluble vitamins. In this 252-day study, Yellowtail Kingfish, <i>Seriola lalandi</i> (2.52 ± 0.25 kg; 546 ± 20 mm [fork length; mean ± standard deviation]) were fed five different diets. A 30% wd-FM diet served as a control. Dietary wd-FM inclusions were reduced to 20% and 10%, replaced with FM by-product meal. In addition, dietary wd-FM levels were reduced to 20% and replaced with poultry meal (PM) or soy protein concentrate (SPC) in two other separate diets. Fat deposition in the liver was similar amongst all treatment groups with bile duct proliferation and periductular fibrosis observed in the livers of fish fed diets with wd-FM replacement with 10% PM or 10% SPC. Fish fed FM by-product meal at 10% and 20% replacement displayed similar liver structures to control fish. Yellowtail Kingfish fed a 30% wd-FM diet may have the FM replaced by up to 66.67% FM by-product, 33.3% PM or 33.3% SPC without any significant impact on total bile acid synthesis, storage and excretion and liver lipid storage. This research expands our ability to deliver cost-effective nutritional solutions in support of Yellowtail Kingfish culture.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"4 6","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70026","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142860555","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":"Proteolytic Enzyme Activity and mRNA Expressions of Amino Acid and Peptide Transporter Genes in Tissues of Nile tilapia (Oreochromis niloticus) Exposed to Different Salinities","authors":"Emmanuel O. Kombat,&nbsp;Godwin Abakari,&nbsp;Abdul-Razak Salifu,&nbsp;Elliot H. Alhassan,&nbsp;Jin-Liang Zhao","doi":"10.1002/aff2.70024","DOIUrl":"https://doi.org/10.1002/aff2.70024","url":null,"abstract":"<p>This study examined the effects of different salinity levels and exposure time on the activity of proteolytic enzymes and the mRNA expression of amino acid (AA) and peptide transporter genes in various fish tissues of Nile tilapia (<i>Oreochromis niloticus</i>). <i>O. niloticus</i> juveniles, weighing 25.30 ± 4.82 g, were subjected to salt concentrations of 0, 6, 12, 18 and 24 g/L for 30 days. After being exposed to salt for 3 h (acute exposure) and 30 days (chronic exposure), fish tissues (liver, gills and intestines) were sampled. Real-time quantitative PCR (RT-qPCR) was used to determine the mRNA expressions of peptide and AA transporter genes, while the activities of proteolytic enzymes were assessed using enzyme-linked immunosorbent assay (ELISA) test kits. Salinity and exposure time had no significant impact (<i>p</i> &gt; 0.05) on the proteolytic enzyme activity in both intestine and liver tissues of <i>O. niloticus</i>, except for elastase and protease at 24 g/L salinity. PepT1a mRNA gene expression in the fish gut was observed to be considerably elevated (<i>p</i> &lt; 0.05) at both exposure times with increasing salinities. PepT1b did not exhibit any appreciable alterations (<i>p</i> &lt; 0.05) in the gills or intestines at the various salinities. In the intestine, the expression of PepT2 was significantly upregulated (<i>p</i> &lt; 0.05) with rising salinity for chronic exposure but remained unchanged for acute exposure. In contrast, the expression of PepT2 rose substantially (<i>p</i> &lt; 0.05) in the gills with rising salinity for acute exposure and downregulated for chronic exposure. Both exposure time and salinity significantly impacted (<i>p</i> &lt; 0.05) the expression of slc3a1 in the gut. There were significant variations (<i>p</i> &lt; 0.05) in slc3a9 expression in the gut and gill at all salinities for both acute and chronic exposures. In contrast, substantial variations in slc3a19 expression were seen in the intestine at various salinities for acute exposure but not for chronic exposure. The gills displayed significant differences at all salinities for both exposure times.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"4 6","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70024","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142860554","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":"Off-Flavour Removal With Advanced Oxidation Process and Hydrogen Peroxide Treatments in Recirculating Aquaculture Systems","authors":"Samu Pettersson,&nbsp;Petra C. Lindholm-Lehto,&nbsp;Jani T. Pulkkinen,&nbsp;Tuula Tuhkanen","doi":"10.1002/aff2.70023","DOIUrl":"https://doi.org/10.1002/aff2.70023","url":null,"abstract":"<p>Aquaculture is becoming increasingly important for the world's food production. Recirculating aquaculture system (RAS) has a reduced water requirement and better possibilities for waste handling. Unfortunately, off-flavours can be formed in RAS and concentrate on fish flesh. Off-flavour compounds cause earthy, musty or other unwanted flavours to fish flesh that consumers find objectionable. Typically, off-flavours are removed by depurating the fish in clean water, but it often takes from days to weeks to fully remove these unwanted flavours that causes additional costs to fish producers. Therefore, reliable methods to reduce the need for depuration are needed. In this study, two methods were investigated for the removal of off-flavours in RAS rearing rainbow trout <i>Oncorhynchus mykiss</i>: an advanced oxidation process (AOP) using a combination of ozone (O₃) and hydrogen peroxide (H₂O₂), and a treatment with H₂O₂ alone. Two treatments (AOP and H₂O₂) and a control without oxidants were applied across nine identical experimental RASs for 8 h day⁻¹ over 10 days, and selected off-flavour compounds in water and fish were analysed. In fish, the concentrations of GSM and MIB were on average 776 and 962 ng kg⁻¹ (AOP) and 688 and 919 ng kg⁻¹ (H₂O₂) compared to 1071 and 1205 ng kg⁻¹ in the controls. The results showed that intensive oxidant treatments reduced the off-flavour concentrations in the recirculating water and in fish, which can potentially lead to reduced depuration time and production costs. Further optimization of the treatment is needed to improve off-flavour removal efficiencies.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"4 6","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70023","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142763964","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":"Abundance, Sex and Size Distribution of European Green Crabs, Carcinus maenas (Linnaeus, 1785), at Natural and Aquacultured Oyster Areas in Great Bay Estuary, NH","authors":"Kelsey Meyer-Rust,&nbsp;Bo-Young Lee,&nbsp;Remington J. Moll,&nbsp;Alyssa Strickland,&nbsp;Gabriela Bradt,&nbsp;Jason S. Goldstein,&nbsp;Bonnie L. Brown","doi":"10.1002/aff2.70009","DOIUrl":"https://doi.org/10.1002/aff2.70009","url":null,"abstract":"<p>Great Bay Estuary (GBE) is a complex estuarine system at the convergence of seven rivers, ocean and land. The GBE ecosystem supports typical estuarine species but, like many estuaries, has been a target of both invasive and range-expanding species. The goal of this study was to compare abundance, sex and size distribution of green crabs between oyster farm sites and non-farmed sites within GBE in 2021 and 2022. Overall catch was higher in 2021 compared to 2022. The highest population of green crabs was estimated to be in the farm area around Cedar Point, and natural/restoration area near Moody Point had the smallest European green crab population. In both years, the majority of green crabs captured (98%) were adult males, and few were juveniles captured. At the last sampling date of 2021 and 2022, most crabs were large (68 ± 0.5 mm and 63 ± 2 mm carapace width, respectively). Shellfish growers, restoration and management teams could use these data in mitigation strategies to sustain industries and enhance GBE health. This information is important for oyster restoration initiatives and oyster growers as they may want to: consider putting traps around their restoration reefs and farms to help reduce green crab infestation/predation in their growing areas; make decisions regarding best management practices and optimal growing locations when applying for permits; and work with management teams with gear improvement, such as floating gear, to reduce green crab intrusion into cages. High-priority locations for trapping should be areas such as oyster farms, oyster reefs and restoration sites.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"4 6","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70009","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142763955","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":"A Review of Studies on the Breeding, Reproduction and Fry Rearing of Largemouth Bass (Micropterus nigricans) in China","authors":"Shoubing Wang,&nbsp;Zijie Song,&nbsp;Xingguo Liu,&nbsp;Sihan Xu,&nbsp;Zhaojun Gu","doi":"10.1002/aff2.70019","DOIUrl":"https://doi.org/10.1002/aff2.70019","url":null,"abstract":"<p>Many countries and regions around the world have been adversely affected by the invasive spread of the largemouth bass (<i>Micropterus nigricans</i>). The breeding practices developed in China can serve as a reference for these regions to manage this species scientifically while providing high-quality protein for human consumption. As its introduction from Taiwan in 1983, the largemouth bass has become one of the most significant high-quality freshwater farmed fish in mainland China. The country has developed new varieties that exhibit faster growth rates and enhanced adaptability to artificial compound feed, leading to widespread aquaculture across the nation. This article systematically reviews the technological advancements in the introduction, breeding, reproduction and rearing of fry and fingerlings of largemouth bass in China over the last 40 years. After summarizing the progress in general breeding as well as fry and fingerling rearing technologies, we analyse three successful early breeding and out-of-season breeding modes developed in China. The advancement of innovative and practical breeding and seedling technologies has addressed the challenges of natural breeding in regions with relatively low temperatures, where it is not feasible to raise local fry to a marketable size for consumption within the same year. This progress significantly enhances largemouth bass aquaculture in China.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"4 6","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70019","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142763956","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":"Gonadal Maturation and Reproductive Timing in Batch Spawning Tropical Cypriniform Fishes Lobocheilos ovalis, Rasbora argyrotaenia and Tor tambra","authors":"Rafhiah Kahar,&nbsp;Norhayati Ahmad,&nbsp;Takaomi Arai","doi":"10.1002/aff2.70007","DOIUrl":"https://doi.org/10.1002/aff2.70007","url":null,"abstract":"<p>This study is the first to investigate the reproductive traits of <i>Lobocheilos ovalis</i> (<i>n</i> = 621), <i>Rasbora argyrotaenia</i> (<i>n</i> = 507) and <i>Tor tambra</i> (<i>n</i> = 138) through detailed gonad histology. We collected <i>L. ovalis</i> and <i>R. argyrotaenia</i> specimens from September 2017 to August 2019 and <i>T. tambra</i> from July 2018 to August 2019 from tropical rainforest streams in Ulu Temburong National Park Brunei Darussalam. In all three species, females were larger and attained sexual maturation at larger sizes than males. Gonad histology categorized five reproductive phases in the ovarian and testicular maturation cycle comprising the immature, developing, spawning capable, regressing and regenerating phases. Ovarian histological markers of the reproductive phases included increasing oocyte diameters and gradual changes in cytoplasmic and nuclear features. In testes, decreasing nuclear diameters, darkening nuclear stains and germinal epithelium continuity were significant histological markers. Monthly frequencies of reproductive phases showed that <i>L. ovalis</i> and <i>R. argyrotaenia</i> were reproductively active throughout the year, whereas <i>T. tambra</i> exhibited protracted spawning over several months. Gonad histology also revealed asynchronous ovarian development and batch spawning, facilitating these species’ year-round and protracted spawning. This reproductive strategy may be an adaptation for these species to increase the survival of offspring in hillstream habitats where flash floods are common. The present study significantly fills existing knowledge gaps in Southeast Asian cypriniform fishes, providing a reference point for gonad histology to elucidate the reproductive traits and ecology, particularly for the <i>Lobocheilos</i>, <i>Rasbora</i> and <i>Tor</i> genera. Importantly, it provides practical insights for the conservation and management of the wild populations of these species.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"4 6","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70007","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142724201","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}