Lakes and Reservoirs: Research and Management最新文献

{"title":"Length–Weight Relationship, Condition Factor and Maturity Characteristics of an Invasive Oreochromis niloticus (Cichlidae) in an Alkaline-Saline Lake Nakuru, Kenya","authors":"Alice Mutie,&nbsp;George N. Morara,&nbsp;Edna Waithaka,&nbsp;Beatrice Obegi,&nbsp;Patrick Loki","doi":"10.1111/lre.12462","DOIUrl":"https://doi.org/10.1111/lre.12462","url":null,"abstract":"<div>\u0000 \u0000 <p>Studies on the length–weight relationship (LWR), condition factor (<i>K</i>) and size at first maturity status are important aspects of fish biology and fisheries management. Although many studies have reported about growth parameters of <i>Oreochromis niloticus</i> under various fishery waters and aquaculture systems, a recent invasion of the species in Lake Nakuru (Kenya) is a new case study. Therefore, this paper provides baseline data on LWR, K and Lm₅₀ of <i>O</i>. <i>niloticus</i> in relation to limnological conditions in the lake. Water quality parameters (pH, temperature, conductivity, dissolved oxygen, salinity and total suspended solids) and indicators of eutrophication status (phosphates, nitrates and chlorophyll<i>-a</i>.) were analysed in November 2020 and November 2021. Fish samples were collected using experimental gillnets with assorted mesh sizes from 2 to 4 in., and their morphometric data was analysed. Results show significant spatial variations (ANOVA; <i>p</i> &lt; 0.05) in all the water quality parameters. These parameters, except the temperature, also significantly differed between the study periods (<i>t</i>-test; <i>p</i> &lt; 0.05). <i>O. niloticus</i> was the most dominant species, comprising 75.3% and 90.8%, in 2020 and 2021, respectively. Mean total length (19.80 cm) and weight (169 g) of the fish in 2021 were greater than 19.20 cm and 153 g in 2020. Nile tilapia exhibited an isometric LWR (<i>b</i> = 3), better well-being (<i>K</i>&gt;1), but it matured at smaller sizes (&lt;25 cm) in both sexes. Further monitoring of water quality changes in Lake Nakuru and their future impact on the population of <i>O</i>. <i>niloticus</i> is recommended.</p>\u0000 </div>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141967656","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":"Quantitative Assessment of Ailia coila (Hamilton, 1822) Fish Population in Kaptai Lake: A Length-Based Approach","authors":"Abdur Rahim Mia,&nbsp;Mitu Ranjan Sarker,&nbsp;Mohammed Shahidul Alam","doi":"10.1111/lre.12460","DOIUrl":"https://doi.org/10.1111/lre.12460","url":null,"abstract":"<div>\u0000 \u0000 <p>The <i>Ailia coila</i>, a small indigenous freshwater fish species in Kaptai Lake, plays a crucial role in providing employment, food, and financial security for the local people. With a high market demand, the average production of this species over the last 5 years reached about 112.27 metric tons. However, there has been a notable decline in <i>Ailia coila</i> fish production in Kaptai Lake in recent years. Therefore, to understand the current stock status of this species, this study employed a length-based stock assessment method the “length-based spawning potential ratio (LB-SPR)”. Between August 2022 and March 2023, a total of 1219 individuals were collected through fortnightly sampling from two fish landing centers (BFDC fishery ghat and Kaptai boat ghat) and two local markets (Banarupa Bazar and Reserve Bazar). The maximum length of <i>Ailia coila</i> was recorded at 15.7 cm in total length, with an average length of 11.1 (±4) cm. The length-weight relationship was estimated as <i>W</i> = 0.01084 <i>L</i>^2.599 (<i>R</i>² = 0.75). The value of shape parameter ‘<i>b</i>’ is smaller than three which indicate a negative allometric growth pattern. The estimated asymptotic length (<i>L</i>_<i>∞</i><i>)</i> and length at first maturity (<i>L</i>_50%) were found to be 16.84 and 10.54 cm, respectively. The LB-SPR revealed that the fishery is currently experiencing overfishing, with the spawning biomass (SPR = 32%) below the target reference point. The mean estimate of fishing mortality relative to natural mortality (F/M) was 3.07, more than three times the threshold F/M = 1, indicating extreme fishing mortality in this fishery. The estimated length at first capture (SL_50%) was significantly higher than the length at first maturity (<i>L</i>_50%), suggesting that the fishing is predominantly targeting mature fishes. To enhance the spawning biomass and ensure the sustainability of the fishery, it is imperative to reduce the current fishing pressure and implement appropriate management measures.</p>\u0000 </div>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141968071","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":"Morphological Variability of Four Anabas testudineus (Bloch 1792) Varieties, Cultured in Pond Aquaculture Systems in Bangladesh","authors":"Ashif Mahmud,&nbsp;Md. Anwar Hossain Mondal,&nbsp;Md. Abu Hanif,&nbsp;Shaharior Hossen,&nbsp;Zahid Parvez Sukhan","doi":"10.1111/lre.12459","DOIUrl":"https://doi.org/10.1111/lre.12459","url":null,"abstract":"<div>\u0000 \u0000 <p>Due to having high market demand and consumer preference, four varieties of <i>Anabas testudineus</i> (indigenous, Thai, Thai-Vietnam, and Vietnamese) have been extensively cultured in Bangladesh over the last few decades. But high similarities in their morphometric traits make population differentiation difficult. The present study used phenotypic markers for their discrimination based on traditional morphometry and truss network measurement. We conducted a study of morphometric variability through the traditional morphometry and truss network systems based on 120 specimens of four varieties of <i>A</i>. <i>testudineus</i> cultured in a coastal region of Bangladesh. Significant (<i>p &lt;</i> 0.05) variation was observed in the analysis of variance (ANOVA) for all the measured traits. In each of the truss network and morphometric measurements, three discriminant functions (DF) were found with 100% variability, which accounted for 89.7% and 65.7% for DF1; 9.7% and 25.7% for DF2 and 0.6% and 8.7% for DF3, respectively. In principal component analysis (PCA), four PCs were observed for traditional morphometry with a total variance of 97.44%, while in the truss network system, the total variance was 98.53% in five PCs. Overall, the investigation found four distinct stocks for indigenous, Thai, Thai × Vietnamese and Vietnamese varieties. The outcomes of this study might be useful for differentiating these four varieties of climbing perch population, genetic study, management and conservation of this fishery at home and abroad.</p>\u0000 </div>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141730274","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":"An Assessment of Local People's Knowledge and Management Practices of Freshwater Macrophytes in Three Kenyan Lakes","authors":"Rebeccah Kwamboka Onwong'a,&nbsp;Ayub M. O. Oduor,&nbsp;Lewis Sitoki,&nbsp;Collins Handa","doi":"10.1111/lre.12461","DOIUrl":"https://doi.org/10.1111/lre.12461","url":null,"abstract":"<div>\u0000 \u0000 <p>It is increasingly being recognised that local people's knowledge can contribute to the ecological and socioeconomic goals of natural resource management programmes. Yet, few studies have examined local people's knowledge concerning freshwater macrophyte diversity. Consequently, the extent to which local people's knowledge can contribute to mitigating freshwater macrophyte degradation and supporting their management remains largely unknown. To contribute towards filling this knowledge gap, we investigated local people's knowledge, perceptions and management practices of freshwater macrophyte species. Data collection involved conducting face-to-face in-depth interviews and focus group discussions among local people who lived in areas adjacent to Lake Baringo, Nyanza Gulf of Lake Victoria and the Kenyan side of Lake Jipe. The sociodemographic characteristics of the respondents were summarised using descriptive statistics. Then, generalised linear mixed-effect models were used to test whether the respondent's sociodemographic characteristics were associated with their macrophyte species recognition skills, benefits and problems associated with macrophytes and management practices. Our respondents named a total of 35 macrophyte species, with each respondent naming an average of six species. Our results showed that respondents who were not involved in fishing and fish-related activities identified more macrophytes than those who participated in such activities. Additionally, individuals who frequently visited the lake named more macrophyte species compared to those who visited either daily or occasionally. While our respondents acknowledged various benefits and problems associated with macrophytes, there was a higher recognition rate for those that directly impacted humans. Regarding local management practices, it was observed that macrophytes were not conserved, with management efforts focusing solely on problematic species. Overall, macrophyte naming skills, knowledge on provisioning and supporting ecosystem services, direct adverse macrophyte impacts and management methods increased with age. We identified knowledge gaps regarding alien species and the indirect impacts of macrophytes. Addressing these gaps is crucial.</p>\u0000 </div>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141730273","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":"Demography and Management of Invasive Common Carp (Cyprinus carpio) From Manasbal Lake Kashmir, India","authors":"Saima Andrabi,&nbsp;Yahya Bakhtiyar,&nbsp;Mohammad Yasir Arafat,&nbsp;Abrar Ahmad Bhat,&nbsp;Muni Parveen","doi":"10.1111/lre.12458","DOIUrl":"https://doi.org/10.1111/lre.12458","url":null,"abstract":"<div>\u0000 \u0000 <p>The present work was carried out to study the demographic aspects of <i>Cyprinus carpio</i>, an invasive species and an ecological pest capable of universal existence. Data on length–frequency was obtained from the two varieties of <i>C. carpio</i> from the deepest freshwater lake of India, Manasbal Lake, over a time period of 1 year (March 2019–February 2020) and analysed using the FiSAT-II software. The mean total length was reported to be 18.58 cm for <i>C. carpio</i> var. <i>communis</i> and 19.18 cm for <i>C. carpio</i> var. <i>specularis</i>, with the dominant length groups being 20–21 and 19–20 cm, respectively. The length–weight relationship parameters yielded the equation logTW = (2.56) logTL − 1.30, <i>r</i> = 0.94, for <i>C. carpio</i> var. <i>communis</i>, with a condition factor (<i>K</i>) value of 1.42 ± 0.25, and logTW = (2.53) logTL − 1.26, <i>r</i> = 0.93 for <i>C. carpio</i> var. <i>specularis</i>, with a condition factor (<i>K</i>) value of 1.38 ± 0.20. Different parameters obtained from the von Bertalanffy growth equation included <i>L</i>_∞ = 38.85 cm; <i>K</i> = 0.170/year; ø′ = 2.409 and <i>t</i>₀ = −0.93 for <i>C. carpio</i> var. <i>communis</i>, and <i>L</i>_∞ = 30.45 cm; <i>K</i> = 0.210/year; ø′ = 2.289 and <i>t</i>₀ = −0.80 for <i>C. carpio</i> var. <i>specularis</i>. The mortality parameters, including total, natural and fishing mortality, were also estimated for <i>C. carpio</i> var. <i>communis</i> to be <i>Z</i> = 0.08, <i>M</i> = 0.40 and <i>F</i> = −0.32, and for <i>C. carpio</i> var. <i>specularis</i>, to be <i>Z</i> = 0.22, <i>M</i> = 0.49 and <i>F</i> = −0.27, respectively. The exploitation rate (<i>E</i>) estimated for both varieties revealed its very less exploitation, suggesting more efficient methods to explore Manasbal Lake to its full capacity and to determine proper measures needed to be taken to conserve the native fauna.</p>\u0000 </div>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141488929","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":"Growth and population structure of Odaxothrissa mento and Brycinus leuciscus from the lower reaches of the White Volta in Ghana","authors":"Evelyn Nhyiraba Quarshie,&nbsp;Elliot Haruna Alhassan,&nbsp;Seth Mensah Abobi","doi":"10.1111/lre.12457","DOIUrl":"https://doi.org/10.1111/lre.12457","url":null,"abstract":"<p>The growth and population structure of two small pelagics: <i>Odaxothrissa mento</i> and <i>Brycinus leuciscus</i> were studied based on 1-year data collected from the White Volta at Yapei in northern Ghana. The species were assessed using an R package TropFishR. The von Bertalanffy growth parameters were estimated with an asymptotic length (<i>L</i>_∞) of 13.65 cm TL (CI_95%: 11.29–17.29), growth curvature of .32/year (CI: .14–.63) for <i>Odaxothrissa mento</i> and <i>L</i>_∞ of 8.85 cm TL (CI_95%: 8.17–11.02) and growth curvature of 1.57/year (CI_95%: .64–1.57) for <i>Brycinus leuciscus</i>. The computed total mortality (<i>Z</i>) was 2.25/year, the natural mortality (<i>M</i>) was .91/year and fishing mortality (<i>F</i>) was 1.34/year for <i>Odaxothrissa mento</i> while <i>Z</i> = 4.5/year, <i>M</i> = 2.8/year and <i>F</i> = 1.7/year were estimated for <i>Brycinus leuciscus.</i> Results indicate that the stock of <i>Odaxothrissa mento</i> is slightly overexploited with a current exploitation rate (<i>E</i>) of .60/year which is above the optimum exploitation rate (<i>E</i>_opt) of .5. However, the stock of <i>Brycinus leuciscus w</i>as found to be underexploited with a current exploitation rate (<i>E</i>) of .38 year⁻¹. The estimated age at 50% capture for <i>Odaxothrissa mento</i> and <i>Brycinus leuciscus</i> were 3.4 years and .65 years, respectively, with their corresponding lengths at 50% capture of 9.14 cm and 5.67 cm, which are close to the mean lengths of the population in the present study. Mean length at first sexual maturity (<i>L</i>_m) for <i>Odaxothrissa mento</i> is estimated as 5.2 and 4.2 cm TL for females and males while <i>L</i>_m of 3.5 cm and 4.5 cm were estimated for females and males of <i>Brycinus leuciscus</i>, respectively. The estimated longevity (<i>t</i>_max) of <i>Odaxothrissa mento</i> and <i>Brycinus leuciscus</i> was 9.7 years and 1.7 years, respectively, indicating that <i>Odaxothrissa mento</i> is a long-lived species while <i>Brycinus leuciscus</i> is a short-lived species. This conforms to the exploitation pattern of the species and thus requires species-specific management interventions.</p>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141286815","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":"Demographics and exploitation of threatened cyprinid, Hypselobarbus kolus from a small-scale reservoir fishery in the Western Ghats hot spot, India","authors":"Chelapurath Radhakrishnan Renjithkumar,&nbsp;Kuttanelloor Roshni","doi":"10.1111/lre.12456","DOIUrl":"https://doi.org/10.1111/lre.12456","url":null,"abstract":"<p>The Western Ghats region (part of Western Ghats-Sril Lanka biodiversity hotspot) in India, is known not only for its rich ichthyodiversity and endemism but also as a region that continues to face various human pressure on its freshwater ecosystem through over-exploitation, habitat destruction and alien fish invasion. Insufficient data regarding the demographics and exploitation pattern of threatened freshwater fishes in the Western Ghats (WG) region serves as a barrier to effectively managing and conserving these species in a sustainable manner. In this study, growth, mortality and exploitation level of an endemic and threatened cyprinid, <i>Hypselobarbus kolus</i> were investigated based on the specimen collected by tribal fishers through small-scale fishery in Poringalkuthu Reservoir, Chalakudy River, WG, India. The asymptotic length (<i>L∞</i>) and growth rate (<i>K</i>) (growth parameters) of <i>H. kolus</i> were estimated as 341.25 mm and 0.64 year⁻¹ respectively. The potential longevity (<i>t</i>_<i>max</i>) and length at first capture (<i>L</i>_<i>c</i><i>)</i> were found to be 4.69 years and 249.34 mm respectively. The fishing mortality (<i>F</i> = 1.20 year⁻¹) of <i>H. kolus</i> was higher than the natural mortality (<i>M</i> =.65 year⁻¹) suggesting an unsustainable level of exploitation for the species within the present study area. Current exploitation rate is greater than <i>E</i>_<i>50</i> and 68% of the predicted maximum exploitation (<i>E</i>_<i>max</i><i>)</i> points out the possibility of uncertain future of the stock under current exploitation rate. An integrative conservation approach, including fishing closure during spawning seasons, mesh size regulation, quotas system for local tribes and fishermen will ensure to sustainable harvesting for the species in the WG hotspot.</p>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141187618","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":"Are fishers captive labourers in reservoir fisheries? Examining governance models and economics in Madhya Pradesh and Rajasthan, India","authors":"Khemraj Bunkar,&nbsp;Ananthan Pachampalayam Shanmugam,&nbsp;Neha Wajahat Qureshi,&nbsp;Sundaramoorthy Chandrasekaran,&nbsp;Laxmi Lal Sharma","doi":"10.1111/lre.12446","DOIUrl":"https://doi.org/10.1111/lre.12446","url":null,"abstract":"<p>Inland fisheries are a source of fish as well as livelihoods for as many as 82% of the total 28 million engaged in the Indian fisheries sector. Reservoir fisheries are a significant component but remain largely untapped, both as a potential resource for development as well as a site of academic interest. The importance of institutional arrangements in governing natural resources is fairly recognized. However, empirical examination of how governance regimes interact with and impact the economic benefits from natural resource extraction for its principal actors is less explored, at least in the Indian context. Through case studies of two uniquely located and differently governed fisheries of Gandhi Sagar (GS, Madhya Pradesh) and Rana Pratap Sagar (RPS, Rajasthan) reservoirs in the Chambal River valley, it investigates the (in)equity in benefit sharing among labour (fishers), capital (fishing contractor), and the management (custodian-state). Neither a purely <i>revenue model</i> of reservoir fisheries governance in RPS nor a seemingly <i>revenue</i> cum <i>welfare model</i> in GS has enhanced the income of nearly 2590 small-scale fishers above their subsistence levels, though the latter provides welfare benefits to its 2209 dependent fishers through cooperatives. Of the gross annual income of INR 13,874/ha in GS and INR 16,126/ha in RPS, the <i>fishers</i> have only one-third share in both cases, while the <i>fishing contractors</i> have 22% (GS) and 34% (RPS), and the <i>resource managers</i> have 29% (GS) and 15% (RPS) share, with the remaining 15% (GS) and 18% (RPS) accounted for by other costs, making the benefit sharing arrangement inequitable for fishers. Two key reforms, immediate market-linked upward revision of sale-price at which fish caught by fishers are collected by the contractors (from INR 33/kg to INR 65/kg), and long-term organization of fisher cooperatives as empowered collectives able to exercise their agency and co-manage the resource, are essential to ensure the fishers do not become captive labourers.</p>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140537810","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":"Fish diversity indices of Hail Haor, a subtropical wetland in the north-east region of Bangladesh: Diversity influencing factors and recommendations","authors":"Md. Mehedi Hasan Pramanik,&nbsp;Md. Monjurul Hasan,&nbsp;Md. Mozzammel Hoque,&nbsp;Md. Moniruzzaman,&nbsp;Rumana Yasmin,&nbsp;Ehsanul Karim,&nbsp;Md. Amirul Islam,&nbsp;Md. Anisur Rahman,&nbsp;Yahia Mahmud","doi":"10.1111/lre.12453","DOIUrl":"https://doi.org/10.1111/lre.12453","url":null,"abstract":"<p>One of the largest wetlands in Bangladesh's north-east, Hail Haor supports a variety of aquatic habitats and has a diversified ecosystem. To ascertain the fish diversity indices of Hail Haor, this study was carried out month by month from December 2020 to June 2021. For this study, three sampling sites in the Moulvi Bazar district—Chiruadobi Beel, Gopla River and Balla Beel were chosen from which fish samples were collected. Twenty-five different fish species were identified and 12,076 fish (individual numbers) were counted and categorized. The Shannon diversity index varied from 1.33 to 1.65. Hail Haor's species diversity index is moderate by the index standard. The Shannon evenness index (E) varied from .41 to .51. The Depressed Community is present in the Hail Haor species diversity index, as per the index standard. The Simpson dominance index fluctuated from .56 to .72. The species diversity index of Hail Haor contains moderate dominance, as per the index standard. With the help of local retailers, fishers, and other relevant stakeholders, the FGD identified factors that have an impact on the diversity index. The current study on diversity indices will be highly beneficial for formulating strategy and managing Hail Haor by strictly adhering to the recommendations.</p>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140297194","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":"Characterizing anthropogenic litter pollutants in African freshwater ecosystems: A case study of Dunga Beach in Lake Victoria, Kenya","authors":"Erick O. Ogello,&nbsp;Mwaruwa M. Mbodze,&nbsp;Nicholas O. Outa,&nbsp;Migeni Z. Ajode,&nbsp;Wycliffe Ojwando","doi":"10.1111/lre.12454","DOIUrl":"https://doi.org/10.1111/lre.12454","url":null,"abstract":"<p>Anthropogenic litter (AL) in world's aquatic ecosystems presents critical ecological threats to environmental quality, aquatic biodiversity and human welfare. However, most studies on AL have been conducted in marine ecosystems with very little focus being given to freshwater systems like Lake Victoria. This study characterized AL pollutants in Dunga beach in Lake Victoria, Kenya, where sampling was done in the beach, riparian and benthic zones along a 100 m reach for 6 days. Across the sampled reaches, the AL associated with packaging, consumer products, building and construction, transport, electronic wastes, textile, fishery and medical materials were collected, counted, sun-dried and weighed. AL were more abundant in the beach and riparian zone than in the benthic reaches with plastics being the dominant litter in all reaches. Based on Kruskal–Wallis rank sum test the density of AL associated with packaging and consumer products was significantly higher than other AL in all the reaches. Plastics, polystyrene and glass wastes dominated the beach zone at 31.19%, 12.14% and 11.14%, respectively. In the benthic area, the dominant wastes were plastics, fishery and polystyrene items at 22.14%, 16.34% and 12.14%, respectively. The top 10 AL pollutants in Dunga beach were as follows: bags/food wrappers, bottle caps, diapers, plastic and glass beverage bottles, plastic plates, forks, knives, spoons, straws and e-wastes. Based on data from literature, several clear patterns emerged when comparing relative AL abundance across other aquatic habitats. In the Lake Michigan Beach, the AL were dominated by plastics (41.2%) followed by cigarettes at 29.3%. In contrast, Chicago River Beach contained more glass wastes (42.1%) while Chicago River Riparian had more plastics (57.8%). At the South Sea of Korea, fishing gear wastes were the majority AL (61.1%). AL consisting of fishing items was restricted to benthic and riparian settings, in which the benthic zone had the most items recorded. It is therefore evident that a large amount of AL waste accumulates at Dunga, Hippo point and other beaches in the world, thus justifying the need for beach cleaning and maintenance strategies. This study presents baseline data that is useful to environmental ecologists, aquatic scientists and management authorities to formulate policies, evaluate guidelines and recommend beach management strategies to conserve aquatic biodiversity, human health and aesthetic value of the freshwater habitats.</p>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140161464","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}