Fisheries Biodiversity Research Articles

Identification of Two Species of the Family Sparidae for eDNA Sequences using a Representative 16SrRNA Reference Library for Omani Fish

Identification of fish species accurately is required to support efforts for conserving fishery biodiversity assessment and sustainable management. Recently, environmental DNA (eDNA) was suggested for regular monitoring of species for effective management of biodiversity. In Oman, molecular reference library representing fish species from the Omani coastline can support such potential approaches. In this communication, we used a local mtDNA-16SrRNA reference library representing Sparidae fish species from the Omani coastlines to identify two Sparidae eDNA sequences (zotu24 and zotu85, from Muscat and Dhofar, respectively) from Acanthopagrus and Diplodus genera reported by a recent eDNA study from Oman. The two species are found to be Acanthopagrus berda and Diplodus cervinus and their sampling sites matches the locations range of the reference specimens. The results indicate the utility and importance for DNA markers’ reference library representing fish species from the Omani coastline to effectively sustain the marine resources using emerging technologies. Keywords: Sparidae, eDNA; 16SrRNA; Acanthopagrus berda; Diplodus cervinus; Oman.

Community-Managed Fish Sanctuaries for Freshwater Fishery Biodiversity Conservation and Productivity in Malawi

Key fish breeding and other biodiverse areas in Malawian lakes are under threat from illegal fishing, the siltation of key breeding areas (due to deforestation-induced soil erosion), and the clearing of shoreline aquatic vegetation. Freshwater protected areas, also called sanctuaries, have the potential to support the restoration of degraded aquatic environments and protect fisheries’ biodiversity. In Malawi, community-managed fish sanctuaries have been established by beach village committees (BVCs) throughout Lake Malawi, Lake Malombe, Lake Chilwa and Lake Chiuta. The sanctuaries were established to conserve exploited stocks, preserve biodiversity, and enhance fisheries’ yield. The BVCs are aligned with local decentralized village development committees linked to District Councils. Together, they constitute a defragmented decentralized ecosystem-based management of fishery resources. A monitoring study was conducted in sanctuaries in the four lakes during the wet and dry season over three years (2016–2019). The monitoring was carried out to evaluate the sanctuaries’ biological performance. The results showed that community-managed sanctuaries contributed to a 24% increase in the total number of observed species. The Shannon Diversity Index increased from an average 1.21 to 1.52. Small and mid-size (<50 ha) sanctuaries showed a higher performance improvement than large (>50 ha) sanctuaries. This is likely due to multiple factors, including a higher level of fish movement and the greater ability of communities to surveil and enforce smaller sanctuaries. The participation of communities in monitoring enhanced the demonstration effects of sanctuaries. This, in turn, encouraged communities to expand the number and size of the sanctuaries. The biological performance results indicate that community-managed freshwater sanctuaries can be used to protect and restore fish biodiversity in freshwater lakes in Africa. Linking the BVCs to defragmented decentralized structures ensures that the interconnectedness between ecosystem uses, including forestry, agriculture, and tourism, which impinge on fish productivity, are addressed holistically.

Delineation of estuarine ecological corridors using the MaxEnt model to protect marine fishery biodiversity

Ecological corridors (ECs) are important management tools to protect biodiversity by linking fragile habitats, especially for highly mobile organisms. ECs in terrestrial landscapes work as passages on land or in water. However, the significance of ECs to migratory species in estuaries has not been well elucidated. Based on annual fishery investigation in the Yangtze estuary and their dominance index rank, three of the top five species, including Larimochthys polyactis, Coilia mystus, and Gobiidae, exhibited absolute dominance in spring during the past 5 years. The temporal and spatial density variance of C. mystus supported its short-distance migration pattern. Redundancy analysis and the MaxEnt model predicted optimum habitats for C. mystus. C. mystus larvae survival was significantly related to salinity, total nitrogen, pH, reactive silicate, dissolved oxygen, surface water temperature, and chlorophyll-a in May and to salinity, surface water temperature, permanganate index, suspended particles, total nitrogen, and total phosphorus in August. The MaxEnt model predicted a broader longitudinal distribution range from offshore to the upstream freshwater area but narrower latitudinal distribution in the southern branch in May than in August. Finally, we delineated migratory corridors connecting optimum habitats for C. mystus using the least-cost route method. Optimum habitats close to the coastlines in the south branch might play a significant role in maintaining population or community connectivity in the Yangtze estuary. Our findings provide a perspective and method to quantify and facilitate the harmonious development of socioeconomy and fishery biodiversity conservation.

Status of the Fishermen Living at the Tangon River Bank- A Case Study from the North-west of Bangladesh

This study intended to provide information on the fishermen engaged in fishing in the Tangon River, Thakurgaon. To assess their existing status, some essential socio-economic information e.g. literacy, religion, health hazards, sanitation and medical facilities, family structure, income level, types of fishermen, fishing, and constraints were taken into account. Results indicated that the majority of the fishermen (77%) belonged to the age class >35-50 years and were dominated by Muslims (89%). Three educational categories were recorded where illiteracy was main (52%), 24% had a primary level of education, and 24% could only sign. This survey revealed that the fishermen near Tangon River are leading measurable life due to great financial hardship. Therefore, proper conservation and management measures must be taken to enhance the fisheries biodiversity in the river so that the fishermen can harvest sufficient fish on a sustainable basis. The government, as well as non-government organizations (NGOs), should take appropriate initiatives to enhance their living standard and to improve such techniques/alternatives that can benefit the underprivileged fishermen to hold present fishing profession in the Tangon River.
 Environ. Sci. & Natural Resources, 13(1&2): 70-75, 2020

Biodiversity underpins fisheries resilience to exploitation in the Amazon river basin.

Inland fisheries feed greater than 150 million people globally, yet their status is rarely assessed due to their socio-ecological complexity and pervasive lack of data. Here, we leverage an unprecedented landings time series from the Amazon, Earth's largest river basin, together with theoretical food web models to examine (i) taxonomic and trait-based signatures of exploitation in inland fish landings and (ii) implications of changing biodiversity for fisheries resilience. In both landings time series and theory, we find that multi-species exploitation of diverse inland fisheries results in a hump-shaped landings evenness curve. Along this trajectory, abundant and large species are sequentially replaced with faster growing and smaller species. Further theoretical analysis indicates that harvests can be maintained for a period of time but that continued biodiversity depletion reduces the pool of compensating species and consequently diminishes fisheries resilience. Critically, higher fisheries biodiversity can delay fishery collapse. Although existing landings data provide an incomplete snapshot of long-term dynamics, our results suggest that multi-species exploitation is affecting freshwater biodiversity and eroding fisheries resilience in the Amazon. More broadly, we conclude that trends in landings evenness could characterize multi-species fisheries development and aid in assessing their sustainability.

Genetic diversity study of three Indian major carps from four riverine ecosystems

Abstract The wild stock of Indian major carps is declining in major rivers of India due to pollution, overexploitation, and inbreeding depression. In the present study, the comparative population structure, genetic diversity, and historical demographics of IMCs, Labeo rohita, Labeo catla, and Cirrhinus mrigala were characterized by analyzing partial 307bp sequences of Cytochrome b gene of 357 individuals collected from seven geographically isolated sites from Indian river basins and two culture zones. The DNA sequences alignment among three species revealed comparative divergence and evolution in these heterogeneous species in terms of over transition to transversion ratio of 6.25. The study implicated the occurrence of 35 haplotypes with haplotype diversity of 0.7333 in L. rohita at Brahmaputra basin showing allelic richness, while no nucleotide diversity (π) 0.000 was observed in L. catla of two geographically isolated locations of Rivers Ganga and Narmada. The analysis of molecular variance (AMOVA) revealed the genetic diversity of IMCs is to be very low (9.40%) within the species, as compared to among the three species (80.76%). The Fst scores ranged between 0.000 and 0.996, indicating low to high genetic structure of IMCs. The Haplotype-1, Haplotype-13, and Haplotype-19 in L. rohita, L. catla, and C. mrigala were considered as ancestral haplotypes, respectively. The expansion factor was found to be 0.45000 and 0.90000 for L. rohita stocks at Farakka-Ganga and Allahabad-Ganga, respectively. The present study provides the first report on genealogical biogeography, evolutionary divergence, and expansion of three IMCs, which could help to formulate the strategies for conservation of fisheries biodiversity in the Indian riverine ecosystems.

Dwindling Coastal Fisheries Biodiversity of Bangladesh: The Causes and Effects

Being a sub-tropical nation in the Ganges-Brahmaputra-Meghna (GBM) Delta with long shoreline along the Bay of Bengal, the coast of Bangladesh is blessed with rich living resources. The country has a coastline of about 710 km and an Exclusive Economic Zone of 121,110 km2. Bangladesh’s coastline extends from St. Martin’s living coral island in the south-east to the Sundarbans-world’s largest adjoining mangrove-in the south-west. The coast holds diverse habitats- coral, sandy, muddy and rocky beaches, salt marshes, grass beds and mangroves - with uniquely diversified faunal configurations. So far, 730 fishes, 150 crustaceans and 336 mollusks have been recorded from the coastal waters of Bangladesh, apart from a number of cephalopods, sea turtles, reptiles, and mammals. Increasing population, destruction of mangroves, pollution, overfishing, and illegal/destructive fishing using set bag nets and monofilament gillnets and an extensive collection of shrimp larvae are the root causes of biodiversity loss in the coast. Already, the near-shore fish stocks are overexploited and catch per unit fishing effort is falling and many shrimp and fish stocks are in the decline. The percentage contribution of marine segment in the fisheries sector of the country is decreasing every year. About 28% of the coastal fishes assessed by IUCN (International Union of Conservation of Nature) are now placed under IUCN Red List of ‘threatened species’. To ensure sustainable fisheries management, a number of laws have been put in place, but the implementation of these laws and regulations is constrained due to conflicts and non-compliance by the stakeholders. Hence, Bangladesh needs a robust legal and policy framework for conservation and sustainable utilization of the coastal resources. Establishment of sanctuaries and marine protected areas following a co-management approach can achieve notable success in protecting coastal biodiversity. Strict enforcement of legal measures aimed at protection of mangroves, development of eco-coastal tourism and social safeguards for resource conservation and management, is needed for long-term and sustainable management of coastal biodiversity of Bangladesh.

Fish Biodiversity, Threat Status and Conservation Significance of the Jamuna River, Bangladesh

Abstract The present survey aimed to explore the fish fauna diversity, abundance and conservation status in the Jamuna River, a tributary of the River Brahmaputra, Bangladesh. During the study period from November 2018 to October 2019, a total of 55 species of fish were recorded, belonging to 6 orders, 20 families and 41 genera from the five selected stations near the river. Orders Cypriniformes and Siluriformes were recorded as the dominant group in the fish fauna community that comprises 34.55% and 30.91% of total species, respectively. Various types of Small Indigenous Species (SIS) and a total of 26 International Union for Conservation of Nature (IUCN) red-listed species were recorded. Population indices, viz. Shannon–Weaver index (H), Simpson’s dominance index (D), Simpson’s index of diversity (1-D), Margalef’s index (d) and Evenness (E), were applied to demonstrate the species diversity, richness and evenness of fish, and their overall values were 1.28-1.48, 0.26-0.33, 0.67-0.74, 1.22-1.46 and 0.77-0.86, respectively. To sustain the prospect of fisheries biodiversity in the Jamuna River of Bangladesh, different fish management and conservation plan of action specifically establishing and maintaining fish sanctuaries, banning indiscriminate fishing and the use of destructive fishing gears for the protection of the breeding and nursery grounds of fish should be taken into consideration with utmost priority.

Review: DNA metabarcoding approach for fisheries management

Increased publications on meta-barcoding promote interests in studies associated with fisheries biodiversity, diet, and biomonitoring. These studies primarily concentrated on an ecosystem that has implications for fisheries management with complex interpretation. Various theories have arisen to describe the interactions among aquatic species and eventually contribute to the roles they play in ecology. Identifying organisms is also a prerequisite for answering questions in the field of ecology, which shows that reliable and accurate knowledge is important and desirable. Therefore, as a modern molecular technique, metabarcoding provides a realistic approach that lets ecologists analyze organisms in complex environmental samples and rapidly solve the problem associated with the food web in the coral reef ecosystem. This research explores the use of metabarcoding in fisheries management research and highlights the drawback and value of the future process.

Ecosystem Integrity of the Upper Victoria Nile in East Africa based on Habitat and Fish Species Biotic Indices

Riverine ecosystems are continuously been compromised by human activities resulting in threatening their integrity. In this study, integrity of Upper Victoria Nile River was assessed using habitat quality and fish biotic indices. Experimental gillnetting was done bi-annually in 9 stations along the river from 2008 to 2018. Nine habitat metrics were used to estimate habitat quality index at every sampling station. Fish sampled, were sorted, identified to species level, and weighed. Counts of introduced and indigenous as well as tolerant and intolerant species were recorded to generate species richness. A total of 10.642 fish, 65 species belonging to nine families were recorded. Dominant species were Lates niloticus 62.79%, Oreochromis niloticus 23.51%, Mormyrus kannume 13.64%; other species were ≤0.06%. Tolerance and trophic guild showed carnivores (61.5%), omnivores (21.5%) and detrivores (16.9%).Mean habitat quality index, total fish catch and fish-based index of biotic integrity varied among stations with highest record of 26.6±6.9, 289.2±51.8 and 30.6±7.9 at sampling station (ST4) respectively. The lowest was 19.4±7.3, 93.1±13.2 and 26.7±6.8 at sampling station (ST2) respectively. On a spatial basis, indices recorded significant differences among stations (p < 0.05). Results indicated a fair fisheries biodiversity that need better conservation management of habitat type of the upper Nile.

Fish biodiversity and livelihood status of fishermen living around the Titas river of Bangladesh.

Fisheries biodiversity is important especially for the rural poor who often rely on fishing to earn their livelihoods. This study was carried out to examine the fish species diversity and livelihood status of fishermen around the Titas River falls under the villages of Radhanagar and Uzanchar at Bancharampur upazila of Brahmanbaria district. Data were collected from randomly selected 80 fishermen and analyzed using descriptive statistical tools, viz. frequency and percentage. A total of 55 fisheries species under 10 orders and 20 families were recorded from the Titas River. Cypriniformes was the most dominant order comprising 19 species followed by Siluriformes (12 species), Perciformes (8 species), Synbranchiformes (4 species), Channidiformes (3 species), Beloniformes (1 species), Osteoglossiformes (2 species), Clupeiformes (2 species) and Tetraodontiformes (2 species). Results also revealed that 60.0% of fishermen were belonged to the age group 31–50 years and 75.0% of them had no individual water body of their own. All of the fishermen were male, of whom 83.7% were married living in kutcha house (55.0%) and 52.5% of their families were nuclear type consisting of husband wife and their children. The illiteracy rate among fishermen was 26.0%, while 41.3% of them could sign only. Many fishermen (68.8%) were able to sell their catch at local market and 60.0% had an annual income ranging BDT 71,000–100,000 (= USD 844.887–1189.92). Overall, fish biodiversity in the Titas River is declining as compared to abundance observed from previous findings. Moreover, the fishermen of that place are leading a poor life having lower income than that of the government minimum wage, a basic pay of BDT 8,250 per month.
 J. bio-sci. 27: 59-67, 2019

Status and impacts of non‐native freshwater fish on fisheries biodiversity and biogeography in Kenya: A management perspective

AbstractThe introduction and spread of non‐native fish species in Kenyan inland freshwater systems are affecting the integrity of Kenya's aquatic biodiversity and ecosystems. The present study investigated the existing knowledge of non‐native fishes in Kenyan inland freshwater systems and their consequential implications regarding fisheries management. A total of 29 non‐native fish species have been introduced to Kenyan inland freshwater systems, with 20 of these being alien fish species and nine extralimital. These introductions have increased the fish faunal compositional similarity of inland drainage systems by 4.1% to a current similarity of 26.9%, compared to a historical similarity of 22.8%. Documented impacts of this situation include displacements, predation, competition, hybridization, habitat modification and disease transmission, all of which have had negative impacts on the status and management of Kenyan freshwater fisheries. The present study addresses the taxonomic bias created by existing studies on non‐native fishes focusing on individual species, by providing more information on the status of other non‐native species about which information is limited and whose status is uncertain. The present study presents information that can be used in management efforts to control invasions and mitigate their negative impacts.

DNA barcoding: A potential tool for fishery biodiversity conservation

PDF HTML阅读 XML下载 导出引用 引用提醒 DNA条形码在渔业生物多样性保护中的应用 DOI: 作者: 作者单位: 1. 中国水产科学研究院黄海水产研究所, 山东 青岛 266071;2. 青岛海洋科学与技术国家实验室, 海洋渔业科学与食物产出过程功能实验室, 山东 青岛 266200;3. 中国水产科学研究院, 北京 100141 作者简介: 柳淑芳,研究员,从事渔业生物学研究.E-mail:liusf@ysfri.ac.cn 通讯作者: 中图分类号: S917 基金项目: 科技部科技基础性工作专项（2013FY110700）；中央级公益性科研院所基本科研业务费专项（2014A11）；山东省泰山学者建设工程专项. DNA barcoding: A potential tool for fishery biodiversity conservation Author: Affiliation: 1. Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China;2. Function Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266200, China;3. Chinese Academy of Fishery Sciences, Qingdao 100141, China Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:生物多样性与人类存亡休戚相关，保护生物多样性是实现人类社会可持续发展的基础。本文立足我国渔业生物多样性现状，针对我国渔业生物过度开发和保护不足等难题，提出了通过开展渔业生物DNA条形码研究来推动我国渔业生物多样性学科发展的思路，详细阐述了DNA条形码在渔业生物资源可持续开发、物种分类鉴定、生物多样性监测、外来物种评价、水产品市场监管、渔业信息化等多个领域的应用现状，进一步展望了DNA条形码可以成为渔业生物区系研究、水域生态研究、电子分类技术以及宏DNA条形码新技术等多个方面的研究热点，呼吁扎实推进我国渔业生物DNA条形码数据库和信息化平台的建设和共享。 Abstract:The Earth's biodiversity are closely altered by a variety of human activities at all scale from local to global. These changes have a strong potential effect to biological communities, ecosystem properties, social affairs and economic development they provide. China fishery is characterized by high biodiversity which cover 10 percent of the total earth species because its role geographical position that occupies the eastern part of the Eurasian continent adjacent to the western Pacific Ocean. In recent years, it is a very realistic and important scientific problem to protect and rationally utilize the biodiversity of fisheries globally. However, insufficient protection and hard utilization of fishery isn't a single case in China. To promote the development of fishery biological diversity in China, this paper puts forward the idea of DNA bar code methods for performing in fishery biology activities. It reviewed how DNA barcode expounds the sustainable development in the fishery biological resources, species identification and classification, fishery biodiversity monitoring, foreign species evaluation, market and supervision, fishery information and so on. Besides that, it further discussed the recent prospects for the DNA barcode in the biologic study of fishery organisms, water ecological research, electronic classification technology and the new technology of meta DNA barcoding. This research had appealed the continuous researches on construction of a fishery DNA barcode database and information platform of China which need to be constructed and shared nationally and globally. 参考文献 相似文献 引证文献

Fisheries biodiversity conservation and sustainable tourism in Mauritius

This paper addresses the sustainability of the tourism sector from the perspective of a Small Island Developing State (SIDS), Mauritius. In this respect, the relationship between tourist earnings and fisheries biodiversity is examined. We begin, in the first place, by tracking and analyzing the evolution of fisheries biodiversity, a catalyst of the island's tourism, through the computation of Shannon's entropy index applied to 20 categories of fish experimented over a period of 25 years. In the second stage, this index is introduced, along with other control variables, in a regression equation to ascertain its potential impact on the value added of the tourism sector. Our empirical findings based on 25 years of observations undeniably reveal that fisheries biodiversity does play a major role in enhancing the revenue generated by the tourism sector. Hence, it is vital to promote biodiversity conservation, at least within the fisheries sector, to sustain economic progress; more so, given that tourism constitutes a major pillar of the economy of Mauritius and which is expected to grow even further.

Biodiversity, Science and Development: Towards and New Partnership.

Opening addresses and messages biodiversity, development and unity of life through biological diversity ecological functions of biodiversity global inventorying and monitoring of biodiversity conservation of biodiversity biodiversity and agriculture, grazing and forestry biodiversity - aquaculture and fisheries biodiversity and industry biodiversity in urban and peri-urban environments biodiversity - culture, values and ethics.