Lakes and Reservoirs: Research and Management最新文献

{"title":"Allometric Growth and Condition Factors Throughout an Annual Life History of Landlocked Ayu Plecoglossus altivelis altivelis in Haidzuka Dam Reservoir","authors":"Dalia Khatun,&nbsp;Tomomi Tanaka,&nbsp;Masahiro Horinouchi,&nbsp;Hidekazu Yoshioka,&nbsp;Futoshi Aranishi","doi":"10.1111/lre.70011","DOIUrl":"https://doi.org/10.1111/lre.70011","url":null,"abstract":"<p>Ayu <i>Plecoglossus altivelis altivelis</i> is a commercially and recreationally important freshwater fish in Japan. This species is categorised into two ecological forms: amphidromous migrating between rivers and sea and landlocked migrating between rivers and lakes or dam reservoirs. Despite its ecological and economical values, growth analysis has been developed limitedly in the early life history of particularly the amphidromous form, and the growth potential of the landlocked form throughout an annual life history remains almost unknown. This study investigated the allometric growth and condition factors along with their variation among months and life stages of artificial landlocked ayu in Haidzuka Dam reservoir and its connected Tabusa River. A total of 281 individuals were collected monthly from October 2017 to September 2018, and their total length (TL) and body weight (BW) ranged from 1.11 to 14.98 cm and 0.001 to 32.148 g, respectively. Although the allometric coefficient (<i>b</i>) of the length–weight relationship varied from 2.71 to 3.44 among months, it indicated overall positive allometric growth (<i>b</i> = 3.83) calculated from the equation BW = 0.0013TL^3.83. The growth pattern altered significantly among life stages from positive allometric for larvae, juveniles, and youngs to negative allometric for adults. The calculated asymptotic length and growth coefficient of the logistic growth model were 17.71 cm and 3.91 year⁻¹, respectively. Significant differences were found in allometric (<i>K</i>_A) and Fulton's (<i>K</i>_F) condition factors among months, while there was no difference in relative condition factor and relative weight (<i>W</i>_R). Life stage-specific analysis also revealed that the adult stage was nutritionally healthier compared to other life stages based on <i>K</i>_A and <i>K</i>_F. Only <i>K</i>_F showed significant correlations with both TL and BW, making it an ideal condition factor to predict the wellbeing of ayu in this reservoir. Moreover, the Wilcoxon signed-rank test for <i>W</i>_R showed no significant divergence from 100, suggesting a balanced habitat in this reservoir for ayu. These findings will be crucial for further studies and to develop appropriate strategies for the sustainable management of artificial landlocked ayu in dam reservoirs.</p>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/lre.70011","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144300118","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":"Distribution and Pollution Assessment of Critical Nutrients and Heavy Metals in the Sediments of Loktak Lake, a Ramsar Site in the Indo-Myanmar Hotspot Region of Manipur Valley (India)","authors":"Ranu Jajo Laishram,&nbsp;Gyanendra Yumnam,&nbsp;Tensubam Basanta Singh,&nbsp;Wazir Alam","doi":"10.1111/lre.70010","DOIUrl":"https://doi.org/10.1111/lre.70010","url":null,"abstract":"<div>\u0000 \u0000 <p>The assessment of nutrient and heavy metal accumulation in lake sediments is essential for understanding their role in the ecohydrological dynamics of lake ecosystems, as sediments can function both as a sink and source of nutrients, metals and various contaminants aquatic ecosystem. The main objective of this study was to evaluate the concentrations of nutrients and heavy metals and their accumulation in the sediments across different sampling locations of Loktak Lake and to compare them against geochemical background values and sediment quality guidelines. The key findings of the study revealed substantial nutrient accumulation in sediments from the Keibul Lamjao National Park site, which can be attributed to the decomposition of organic matter from dense floating vegetative masses called ‘<i>Phumdis</i>’. Iron concentrations in sediments were significantly high, ranging from 909.83 to 1004 mg/kg and its enrichment is likely due to diffused surface runoff from the iron-rich soils from the surrounding catchment entering the lake through feeder rivers and other anthropogenic influences. The average metal concentrations were in the order of Fe &gt; Mn &gt; Zn &gt; Cu, and all values were below the average shale concentrations and the Interim freshwater Sediment Quality Guidelines (ISQG) set by the Canadian Council of Ministers of the Environment (CCME). The evaluation of the heavy metal pollution status of the lake sediments based on various pollution indices such as the contamination factor, degree of contamination, modified degree of contamination, geoaccumulation index, pollution load index and potential ecological risk index, suggested an overall low level of metal pollution in the sediments of Loktak Lake. The findings of this study provide a crucial baseline for understanding on the sediment-associated nutrient and metals dynamics in Loktak Lake which can aid in the formulation of long-term lake management strategies for preserving the ecological integrity and health of this precious lake ecosystem of the region.</p>\u0000 </div>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144244150","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on the Macroinvertebrates Community, A Bio-Indicator of Water Quality in Deepor Beel (Ramsar Site), Assam","authors":"Arnab Mandal,&nbsp;Rakesh Basumatary,&nbsp;Anil C. Ranveer,&nbsp;M. K. Choudhury","doi":"10.1111/lre.70009","DOIUrl":"https://doi.org/10.1111/lre.70009","url":null,"abstract":"<div>\u0000 \u0000 <p>Given the limited and geographically narrow research on macroinvertebrate distribution in subtropical wetlands, this study aims to provide a comprehensive assessment of species assemblages and ecological health across multiple sites in Deepor Beel, a well-known wetland and Ramsar Site in north-eastern India. The current study examines the complex impact of anthropogenic pressures on benthic macroinvertebrates. During the post-monsoon and winter seasons of 2023–2024, samples were collected systematically from three important locations, including touristic destinations (Station-1), garbage dump sites and densely inhabited areas (Station-2), and flow-out points (Station-3). The recorded dataset includes 467 members from 14 families spread throughout 8 orders and 3 separated phyla. The phylum Mollusca appeared as the major taxonomic group (53.74%), controlling the gathered samples, with Arthropoda (45.18%) and Annelida following in hierarchy. Within this taxonomic framework, significant information was discovered, identifying Viviparidae, Lymnaeidae, and Planorbidae as the most abundant families, accounting for 16.27%, 15.84%, and 15.84% of total individuals, respectively. Furthermore, an in-depth examination of richness (Margalef richness) and diversity (Shannon-Wiener Index) indices demonstrated a deteriorating tendency from areas less affected by human interventions to those bordered by a trash dump and residential agglomeration. Macroinvertebrate saprobic scores show that Station-3 near the flow-out point to the river Brahmaputra (5.5) is in good environmental condition, whereas Stations-1 and 2 (4.9 and 4.66) are moderately polluted and impacted by anthropogenic activity. Redundancy analysis highlights the association between moderate pollution indicator taxa Gerridae (Hemiptera), Hydrophilidae (Coleoptera), and Hirudidae (Hirudinea) and increasing organic loads (BOD, COD) at Station-1 and 2. The combination of macroinvertebrate family data and water quality parameters underlines the need for a comprehensive approach to assess the health and sustainability of lake ecosystems. The study's findings have implications for developing educated conservation and management policies in the face of growing anthropogenic threats.</p>\u0000 </div>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144125898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microplastic Pollution in Waters and Sediments in a Lentic System: A Case Study in a Tropical Wet Urban Lake of Samarinda, Indonesia","authors":"Hamdhani Hamdhani,&nbsp;Rima Maleni,&nbsp;Drew E. Eppehimer,&nbsp;Abdunnur Abdunnur,&nbsp;Samsul Rizal,&nbsp;Ardianor Ardianor","doi":"10.1111/lre.70008","DOIUrl":"https://doi.org/10.1111/lre.70008","url":null,"abstract":"<div>\u0000 \u0000 <p>The widespread use of plastic materials globally has sparked concerns regarding microplastic (MP) pollution, which is prevalent in water bodies worldwide and poses threats to aquatic life. Despite this, there remain uncertainties regarding the quantity, types and chemical makeup of MP, particularly in tropical urban lakes. This study aimed to examine the presence, distribution, types and chemical composition of MP in both the surface water and sediment of Air Hitam Lake, located in Samarinda City, East Kalimantan, Indonesia. Field sampling was conducted in February 2023 at 10 sites within the lake. The average concentration of MP in water was measured at 0.91 particles per litre, while sediment concentrations reached 375 particles per kilogram of dried sediment. Higher concentrations were observed near the lake inlet. Fibres were the most commonly observed type of MP in both surface water (79%) and sediment (76%) samples, followed by fragments and films. There was no significant correlation between MP concentrations in water and sediment. Fourier Transform Infrared (FTIR) analysis revealed the presence of polyester, polypropylene, nylon fibres, polyethylene, polystyrene polyvinylchloride in the samples, with polyethylene being the predominant compound, accounting for 46% of all surface water and sediment samples. The presence of MP derived from the degradation of larger plastic debris originating from visitors and the local community who dispose of plastic trash improperly highlights the importance of implementing effective plastic waste management strategies in communities surrounding the lake. This is crucial for preserving the ecosystem benefits provided by the lake. This study contributes to addressing knowledge gaps regarding MP pollution in tropical urban lakes and lays the groundwork for further research into inland freshwater environments.</p>\u0000 </div>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143883889","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Population Parameters and Exploitation Rate of Porogobius schlegelii (Perciformes: Gobiidae) in Lake Ahémé (Benin, West Africa)","authors":"Djiman Lederoun,&nbsp;Pierre Vandewalle,&nbsp;Boniface D. Houndekounnou,&nbsp;Imaculé S. Baglo,&nbsp;Philippe A. Lalèyè","doi":"10.1111/lre.70006","DOIUrl":"https://doi.org/10.1111/lre.70006","url":null,"abstract":"<div>\u0000 \u0000 <p>Lake Ahémé is one of the main fishing areas in the Couffo basin. <i>Porogobius schlegelii</i> (Gunther, 1861) is one of the fish most exploited by artisanal fishing after the cichlid species. Sustainable management of the species requires reliable data on the current pressure of traditional fishing in order to find measures to adjust fishing activities to the recruitment capacity of the species. Therefore, from January to December 2020, data on total length, total weight and sex were collected monthly on a total of 3447 specimens of <i>P. schlegelii</i> caught by local fishermen. The size at first maturity (<i>L</i>₅₀) determined with the statistical package sizeMat was estimated at 6.5 and 6.2 cm for males and females, respectively. The asymptotic length obtained with the TropFishR statistical package was 14.8 cm for both sexes. The growth coefficient and growth performance index were 0.87 year⁻¹ and 2.28, respectively, with a normalised adjustment value of 0.21. Estimates of total, natural and fishing mortality were 3.55, 1.53 and 2.02 year⁻¹, respectively. The current exploitation rate was 0.57 and as such remained above the exploitation rate at 50% of its unexploited biomass (<i>E</i>_0,5 = 0.37). Therefore, a reduction in the current exploitation rate is required by at least 35.1% to maintain sufficient biomass. The estimated size at first capture of 5.9 cm is smaller than <i>L</i>₅₀ for both sexes. These parameters clearly reflect a current trend of overexploitation. Monitoring of fishing efforts and sensitisation of fishermen to catch fish measuring at least 9.3 cm (optimal length) are among the management measures recommended to sustain the <i>P. schlegelii</i> fishing in Benin.</p>\u0000 </div>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143497051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Length-Weight and Length-Length Relationships of Three Small Indigenous Ornamental Fishes Collected From Jorasar River of Sonitpur District, Assam, India","authors":"Gitartha Kaushik,&nbsp;Sonamainao Swargiary,&nbsp;Borsha Gogoi,&nbsp;Saurav Baglari,&nbsp;Surashmi Bhattacharyya,&nbsp;Sabitry Bordoloi","doi":"10.1111/lre.70007","DOIUrl":"https://doi.org/10.1111/lre.70007","url":null,"abstract":"<div>\u0000 \u0000 <p>The present study describes the length-weight relationships (LWRs) and length-length relationships (LLRs) for three species: <i>Parambassis baculis</i> (Hamilton 1822), <i>Gagata cenia</i> (Hamilton 1822) and <i>Mystus tengara</i> (Hamilton 1822) from the Jorasar river in Sonitpur district of Assam, India. The study shows positive allometric growth (3.133) for <i>M. tengara</i>, isometric growth (2.916) for <i>G. cenia</i>, and negative allometric growth (2.295) for <i>P. baculis</i>, with regression coefficients (<i>r</i>^<i>2</i>) 0.953, 0.969, and 0.955, respectively. The Parameter <i>a</i> was recorded as 0.007 for <i>M. tengara</i>, 0.013 for <i>G. cenia</i>, and 0.030 for <i>P. baculis</i>. The current study will contribute to the conservation of these ichthyofaunas while enhancing fish stock analysis for appropriate management.</p>\u0000 </div>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143497052","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Morphometric Analysis and Prioritisation of the Punarbhaba-Atrai-Jamuna River Basins in the Northwest Bangladesh for Soil Conservation","authors":"Baig Abdullah Al Shoumik,&nbsp;Md. Sanaul Islam,&nbsp;Muhammad Yousuf Jat Baloch","doi":"10.1111/lre.70005","DOIUrl":"https://doi.org/10.1111/lre.70005","url":null,"abstract":"<p>Morphometric analysis plays a key role in understanding the geological and hydrological behaviour of watersheds and their prioritisation for soil conservation. The Punarbhaba-Atrai-Jamuna river system of northwest Bangladesh is agriculturally important, but the watersheds are frequently affected by droughts in summer and river erosion during the monsoon season. The morphological studies on this river systems are very limited, and hence, the aim of this study was to investigate the morphological characteristics of their largest basins and prioritise the studied watersheds based on erosion vulnerability using two approaches. The remote sensing tools were used to delineate and analyse the linear, areal and relief aspects of the morphometric indices of the six largest river basins of Dinajpur district as the conventional methods of determining the morphological characteristics of a basin are expensive and time-consuming. The studied basins included the following regions—Dinajpur Sadar-Birganj (DS-B), Dinajpur Sadar-Khansama (DS-K), Chirirbandar-Khansama (C-K), Nawabganj-Chirirbandar (N-C), Birampur-Parbatipur (B-P) and Hakimpur-Parbatipur (H-P). The results of the bifurcation ratio, length of overland flow, drainage density, drainage texture and constant channel maintenance indicated that the watersheds were well-dissected and had less flood and erosion risk. The values of form factor, elongation ratio, circularity ratio and compactness coefficient dictated an elongated shape of all the basins with a mature geological adjustment. The multi-criteria prioritisation, combining morphometric analysis with land use factors, offers a holistic understanding of watershed vulnerability signifying DS-B and N-C the most vulnerable watersheds, which require a sustainable development decision making framework for their management. This research also provides the brief morphological features of the three complex river system to design management practices for conservation and open a dimension for future research on the application of soil erosion models to estimate soil loss.</p>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/lre.70005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143120295","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":"Intraspecific Morphological Discrimination Between the Stocks of Schizothorax curvifrons (Sattar Gad), Inhabiting the Water Bodies of Cold Indian Himalayan Region, Using Truss Network System","authors":"Gulshan Akhter,&nbsp;Imtiaz Ahmed,&nbsp;Syed Mudasir Ahmad","doi":"10.1111/lre.70002","DOIUrl":"https://doi.org/10.1111/lre.70002","url":null,"abstract":"<div>\u0000 \u0000 <p>Identification of <i>Schizothorax curvifrons</i> (Sattar gad) stocks in Kashmir water bodies is crucial for the conservation of species that are losing ground daily. Because of substantial overfishing and pollution in the fish's natural environment, the wild population of these fishes is drastically dropping, which is a troubling situation that justifies a high priority for conservation. Fish populations can acquire morphometric variations as a result of prolonged isolation and interbreeding. The goal of this study was to use the truss network approach to delineate the stock structure of <i>S. curvifrons</i> based on morphological attributes. A total of 167 fish specimens were gathered from the three sampling stations of Kashmir waters, viz. Telbal Nallah, Dal Lake and Anchar Lake. A total of 37 truss distance measurements were established by joining 15 morphometric landmark points on the fish body. For the fish species currently targeted, MANCOVA demonstrated significant (<i>p</i> &lt; 0.001) morphological heterogeneity among sampling locations. Univariate ANOVA test showed statistically significant differences in 21 out of the total 37 studied morphometric variables among the three sampling sites for <i>S. curvifrons.</i> Based on principal component analysis, the first component (PC1) explained the maximum amount of variation in samples, which is 26.9%. The second component (PC2) contributes 16.5%, and the third (PC3) 10.3% of the total variance. Wilk's lambda test found substantial (<i>p</i> &lt; 0.001) differences in the morphometric measures of the fish across all sampling sites. The discriminant function analysis identified two morphological indices that explained 58.8% and 42.2% of the differences between the groups. Discriminant function analysis further revealed 84.6% correctly classified individuals into their respective populations. The findings from this investigation can be used to develop stock-specific management and conservation strategies for the long-term protection of <i>S. curvifrons</i> in Kashmir water bodies.</p>\u0000 </div>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143115572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Morphology and Reproductive Biology of Blue Perch Badis assamensis Ahl 1937 Recorded From a Hill Stream in Assam, India","authors":"Jafrin Farha Hussain,&nbsp;Sabitry Bordoloi","doi":"10.1111/lre.70000","DOIUrl":"https://doi.org/10.1111/lre.70000","url":null,"abstract":"<div>\u0000 \u0000 <p>A badid, <i>Badis assamensis</i> Ahl, 1937, was recorded for the first time from the intermediate zone of a semi-torrential stream called Basistha in Assam, which is a small tributary of the river Brahmaputra. The fish species <i>Badis assamensis</i> is currently listed in the data deficient (DD) category of IUCN. The species has previously been reported in swampy wetlands in the upper reaches of the Brahmaputra valley in Assam; with no detail description on its biology however. The current work redescribes morphology and presents detail reproductive biology of this species based on fresh collection of 377 individuals from the Basistha. length-weight relationships (LWR) analysed in this species indicated an isometric growth; and condition factor (<i>K</i>) indicated a suitable habitat for this species. <i>Badis assamensis</i> exhibits a non-seasonal breeding behaviour twice a year, as analysed from the Gonado-somatic and ovarian indices. During certain period of the year, local people use unscientific ways of fish collection thereby resulting in a steep decline in fish population. The study is believed to lay an insight into this species' geographical range from a swampy wetland habitat in upper reaches of the Brahmaputra basin; to a semi-torrential hill stream habitat in the lower Brahmaputra sub-basin; thereby providing baseline information on this DD species. Analysis of morphometric and reproductive parameters of this species not reported earlier is the major highlight of the present study.</p>\u0000 </div>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143114749","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Estimating Fisheries Reference Points for Five Data-Limited Fish Stocks in Kaptai Reservoir, Bangladesh","authors":"Mst Halima Khatun,&nbsp;Md. Mahiuddin Zahangir,&nbsp;Bably Akhter,&nbsp;Azmaien Naziat,&nbsp;Qun Liu","doi":"10.1111/lre.70004","DOIUrl":"https://doi.org/10.1111/lre.70004","url":null,"abstract":"<div>\u0000 \u0000 <p>The Kaptai reservoir is one of the important fisheries hubs in Bangladesh for its significant role in the national economy and socio-economic sector. However, easy accessibility to the reservoir along with other human-driven disturbances are pushing the stocks at risk. The sustainable fishery management depends on estimating a stock's total allowable catch (TAC), therefore, a recently developed Monte Carlo method (CMSY) was used for five data-limited stocks (catfish, <i>Sperata aor</i>; snakehead, <i>Channa marulius</i>; carp, <i>Labeo rohita</i>; cichlids, <i>Oreochromis mossambicus</i> and featherback, <i>Notopterus notopterus</i>) to estimate their fishery reference points using their catch, resilience and exploitation record at the first and last catch of the year. A Bayesian state-space implementation of the Schaefer surplus production model (BSM) was also used to compare and justify the output of the CMSY. CMSY estimated the maximum sustainable yield (MSY) to be 378, 110, 74.5, 432 and 99 mt for <i>S. aor</i>, <i>C. marulius</i>, <i>L. rohita</i>, <i>O</i>. <i>mossambicus</i> and <i>N. notopterus</i>, respectively. The result suggests that <i>C. marulius</i>, <i>L. rohita</i> and <i>O. mossambicus</i> fisheries were rebuilding naturally and at underfishing and underfished state according to the values of <i>F</i>/<i>F</i>_MSY and <i>B</i>/<i>B</i>_MSY as per BSM (value &lt; 1). Value of <i>B</i>_MSY greater than present biomass estimated by BSM for <i>L. rohita</i> and <i>O. mossambicus</i> predicts that the stock's overexploitation state seeking serious attention. Although the <i>S. aor</i> fishery seemed to be sustainable and had the potential to produce more, <i>F</i>/<i>F</i>_MSY and <i>B</i>/<i>B</i>_MSY values close to 1 recommend strict management actions for further sustainability. However, <i>F</i>/<i>F</i>_MSY 1.31 for <i>N. notopterus</i> reveals that the stock depleted remarkably making this fishery unsustainable. The study reveals that Kaptai reservoir fisheries require intensive care to maintain sustainable resources. Strict implication of allowable catch limit, mesh size regulation, maintaining water quality, and protection of breeding and nursery ground is highly recommended.</p>\u0000 </div>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143114750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}