scholarly journals Human impacts on global freshwater fish biodiversity

Science ◽  
2021 ◽  
Vol 371 (6531) ◽  
pp. 835-838
Author(s):  
Guohuan Su ◽  
Maxime Logez ◽  
Jun Xu ◽  
Shengli Tao ◽  
Sébastien Villéger ◽  
...  
Keyword(s):  
Freshwater Fish ◽  
Fish Species ◽  
Human Activities ◽  
Native Species ◽  
Human Impacts ◽  
Goods And Services ◽  
Cumulative Change ◽  
River Fragmentation ◽  
Biodiversity Changes ◽  
The Impact

Freshwater fish represent one-fourth of the world’s vertebrates and provide irreplaceable goods and services but are increasingly affected by human activities. A new index, Cumulative Change in Biodiversity Facets, revealed marked changes in biodiversity in >50% of the world’s rivers covering >40% of the world’s continental surface and >37% of the world’s river length, whereas <14% of the world’s surface and river length remain least impacted. Present-day rivers are more similar to each other and have more fish species with more diverse morphologies and longer evolutionary legacies. In temperate rivers, where the impact has been greatest, biodiversity changes were primarily due to river fragmentation and introduction of non-native species.

scholarly journals Biological aspects of two coexisting native and non-native fish species in the Aegean Sea: Pagellus erythrinus vs. Nemipterus randalli

2019 ◽  
Vol 20 (3) ◽  
pp. 594 ◽  
Author(s):  
SERCAN YAPICI ◽  
HALİT FİLİZ
Keyword(s):  
Fish Species ◽  
Native Species ◽  
Stomach Contents ◽  
Aegean Sea ◽  
Food Competition ◽  
Food Sources ◽  
Early Maturation ◽  
Pagellus Erythrinus ◽  
Lessepsian Species ◽  
The Impact

Nowadays, the Mediterranean is a hotspot of biodiversity, characterized by changes in fish communities due to invasions. These invasions, mainly occurring through the entrance of species through the Suez Canal, a process called Lessepsian migration, has been increasing in the last 40 years. It is reported that, in Turkish seas, where 512 fish species are found, are 75 Lessepsian species. However, knowledge about the impact of Lessepsian species on native species is insufficient. This study aims to determine the bio-ecological characteristics and food interactions of a native Pagellus erythrinus and non-native Nemipterus randalli distributed in the Gökova Bay.In the monthly sampling survey, carried out between January 2016 and December 2016, 1698 N. randalli and 945 P. erythrinus individuals were collected. Length, weight, age, sex distributions and ratios, length-age, weight-age, length-weight relationships, condition factors, stomach contents and reproduction periods were examined to determine the interaction between species. According to results, the life span of P. erythrinus is longer than N. randalli in the Gökova Bay. Nevertheless, N. randalli grows faster than P. erythrinus. Reproduction periods of both two species show similarities. Food competition between species is found to be significantly high. Results of condition factors exhibit that N. randalli shows an increased ability to exploit the available food sources. Pagellus erythrinus displays strategies such as: early maturation, short reproduction period, reproduction in the deeper waters and batch spawning, to compete with N. randalli. With the invasive characteristics of N. randalli established a successful population in the Gökova Bay.

scholarly journals Conflicts in the coastal zone: human impacts on commercially important fish species utilizing coastal habitat

2018 ◽  
Vol 75 (4) ◽  
pp. 1203-1213 ◽  
Author(s):  
Elliot J Brown ◽  
Rita P Vasconcelos ◽  
Håkan Wennhage ◽  
Ulf Bergström ◽  
Josianne G Støttrup ◽  
...  
Keyword(s):  
Fish Species ◽  
Human Activities ◽  
Human Impacts ◽  
Coastal Development ◽  
Life History Stage ◽  
Coastal Habitat ◽  
Anthropogenic Pressures ◽  
Coastal Habitats ◽  
Commercially Important ◽  
Fishing Impacts

Abstract Coastal ecosystems are ecologically, culturally, and economically important, and hence are under pressure from diverse human activities. We reviewed the literature for existing evidence of effects of human-induced habitat changes on exploited fish utilizing coastal habitats. We focused on fish species of the Northeast Atlantic for which fisheries advice is provided by International Council for the Exploration of the Sea (ICES) and which utilize coastal habitats for at least one life-history stage (LHS). We found that 92% of these species are impacted by human activity in at least one LHS while utilizing coastal habitat and 38% in multiple stages. Anthropogenic pressures most commonly shown to impact these fish species were toxicants and pollutants (75% of species). Eutrophication and anoxia, invasive species, and physical coastal development affected about half of the species (58, 54, and 42% of species, respectively), while indirect fishing impacts affected a minority (17% of species). Moreover, 71% of the ICES advice species that utilize coastal habitats face impacts from more than one pressure, implying cumulative effects. Given that three-fourths of the commercial landings come from fish species utilizing coastal habitats, there is an obvious need for a better understanding of the impacts that human activities cause in these habitats for the development of ecosystem-based fisheries management.

scholarly journals The extinction of the Catarina pupfish Megupsilon aporus and the implications for the conservation of freshwater fish in Mexico

Oryx ◽  
2018 ◽  
Vol 54 (2) ◽  
pp. 154-160 ◽  
Author(s):  
Arcadio Valdés González ◽  
Lourdes Martínez Estévez ◽  
Ma. Elena Ángeles Villeda ◽  
Gerardo Ceballos
Keyword(s):  
Freshwater Fish ◽  
Water Use ◽  
Ecosystem Management ◽  
Fish Species ◽  
Human Activities ◽  
National Strategy ◽  
Freshwater Fish Species ◽  
Ecological Implications ◽  
Conservation Effort ◽  
In Captivity

AbstractExtinctions are occurring at an unprecedented rate as a consequence of human activities. Vertebrates constitute the best-known group of animals, and thus the group for which there are more accurate estimates of extinctions. Among them, freshwater fishes are particularly threatened and many species are declining. Here we report the extinction of an endemic freshwater fish of Mexico, the Catarina pupfish Megupsilon aporus, the sole species of the genus Megupsilon. We present a synopsis of the discovery and description of the species, the threats to, and degradation of, its habitat, and the efforts to maintain the species in captivity before it became extinct in 2014. The loss of the Catarina pupfish has evolutionary and ecological implications, and highlights the crisis of freshwater fish extinctions. It is a warning of the likely fate of more than 200 freshwater fish species threatened with extinction in Mexico. To save these species, the country urgently needs a national strategy to articulate a bold conservation effort, with better policies on ecosystem management and water use.

scholarly journals Status of Endemic Freshwater Fish Fauna Inhabiting Major Lakes of Turkey under the Threats of Climate Change and Anthropogenic Disturbances: A Review

Water ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1534
Author(s):  
Daniela Giannetto ◽  
Deniz Innal
Keyword(s):  
Freshwater Fish ◽  
Fish Species ◽  
Native Species ◽  
Fish Assemblages ◽  
Fish Communities ◽  
Fish Fauna ◽  
Current Status ◽  
Global Issue ◽  
Freshwater Fish Fauna ◽  
Endemic Fish

Due to its peculiar geographical position and its environmental heterogeneity, Turkey represents an important biodiversity hotspot for freshwater fish fauna. Unfortunately, native fish communities of Turkey, mainly from lentic ecosystems, have been massively altered in the past decades. Furthermore, these species, especially the endemic species, are now threatened by several human activities in addition to the global issue of climatic changes. The aim of this paper is to provide an updated review on the current status of endemic fish species from main lakes of Turkey including major threats affecting fish assemblages. By gathering data from the literature and authors’ personal observations, 62 endemic fish species were reported to occur in the considered 37 Turkish Lakes. The presence of non-native species, agriculture activities, climatic drought, and decreasing water level were found to be the threats that most affect the fish communities of the considered Turkish Lakes.

scholarly journals Occurrence of Mycotoxins in Certain Freshwater Fish Species and the Impact on Human Health: A General Review

2021 ◽  
Author(s):  
Muralidharan Velappan ◽  
Deecaraman Munusamy
Keyword(s):  
Human Health ◽  
Freshwater Fish ◽  
Fish Species ◽  
Food Chain ◽  
Catla Catla ◽  
Freshwater Fish Species ◽  
Comprehensive Information ◽  
Contamination Levels ◽  
Wet Market ◽  
The Impact

Mycotoxins are toxic secondary metabolites produced by organisms of the fungus kingdom, which are capable of causing disease and death in humans and animals when present in food. Recent studies evinces fish consumption might become another way for mycotoxins to enter the human food chain. Although the increasing research publications related to the occurrence and prevention of mycotoxin contamination in fish feeds, there was limited studies on bioaccumulation of mycotoxins research in common freshwater fish species. Further this was assumed fish species of salmonid and cyprinids are very sensitive to feed-borne mycotoxins so far. Studies have demonstrated, fish may also carry mycotoxins residue along the food chain, thus compromising human health. This review describes mainly mycotoxin contaminations in certain freshwater fish species and the impact on human health due to their potential proven toxicity. This review also provided comprehensive information on mycotoxins contamination levels in muscle and liver tissue of some freshwater fish species such as Nile tilapia, Labeo rohita, and Catla catla during capturing in fresh water lakes and also fish sold at wet market and hypermarket in Chennai, Tamilnadu.

scholarly journals Alien pathogens and parasites impacting native freshwater fish of southern Australia: a scientific and historical review

2020 ◽  
Author(s):  
Simon Kaminskas
Keyword(s):  
Freshwater Fish ◽  
Fish Species ◽  
Fish Populations ◽  
Native Fish ◽  
Freshwater Species ◽  
Trade Offs ◽  
Murray Darling Basin ◽  
General Decline ◽  
Alien Fish ◽  
The Impact

ABSTRACT Native freshwater fish of Australia have a diverse but largely undescribed endemic pathogen and parasite fauna. However, due to long-shared evolutionary histories and virulence/transmissibility trade-offs, effects of these endemic pathogens and parasites appear to be subtle: significant impacts are rarely observed and epizootics have not been recorded. In contrast, a number of alien pathogens and parasites are now established across southern Australia, causing manifestly harmful effects to native fish species and known or suspected epizootics in native fish populations. Undetected and/or undescribed alien viral pathogens are also suspected of being present. Alien pathogens and parasites were introduced to Australia with imports of live alien fish or their fertilised eggs. A review of the scientific and historical evidence indicates that they have had, and continue to have, greater impacts on native fish species than previously realised—especially for freshwater species. This review also documents a previously unknown, Murray-Darling-Basin-wide epizootic of Murray cod Maccullochella peelii in 1929–30, which may have contributed to strong declines in the related eastern freshwater cod Maccullochella ikei. A serious Chilodonella epizootic of M. peelii in 1982 is also examined. In addition, a possible role for alien viruses of the family Iridoviridae (Ranavirus and Megalocytivirus) in the general decline of the critically endangered silver perch Bidyanus bidyanus, and the rapid collapse of two specific native fish populations—upper Murrumbidgee River B. bidyanus and Shoalhaven River Macquarie perch Macquaria australasica—is suggested. It is argued that the severity of the impact of the virulent alien oomycete Saprolegnia parasitica, both historical and present day, has been underestimated. Finally, action is recommended against emerging new pathogen and parasite threats, and the extreme risk current alien fish importations pose in introducing them. These will further threaten already stressed native fish populations in southern Australia, particularly across the Murray-Darling Basin.

scholarly journals Development potential of native fish in Batang Toru Watershed, North Sumatra, Indonesia: discussion on the impact of dam development and aquaculture efforts

2021 ◽  
Vol 322 ◽  
pp. 02003
Author(s):  
Dadang Shafrudin ◽  
Sulistiono ◽  
Charles P. H. Simanjuntak ◽  
M. Fadjar Rahardjo ◽  
Dudi M. Wildan ◽  
...  
Keyword(s):  
Data Analysis ◽  
Freshwater Fish ◽  
Fish Species ◽  
Native Fish ◽  
Potential Development ◽  
Cultured Fish ◽  
Riverine Fish ◽  
The Impact ◽  
North Sumatra ◽  
Aquaculture Development

As one of the sizable rivers in the Sumatra region, the Batang Toru River is a habitat for various fish species, some of which are potential to be developed as cultured fish. This study was carried out in April, July, and October 2019 in the Batang Toru River watershed of South Tapanuli Regency, North Sumatra, to evaluate a potential development of the riverine fish for aquaculture development. The methods used were fisheries surveys and discussions with various communities and related agencies in the South Tapanuli Regency. The data obtained were presented descriptively. Based on the result of data analysis collected in the field, there were several potential fish species to be cultured in this study, including mahseer (Tor tambroides, T. tambra, Neolissochilus soro), catfish (Hemibagrus spp.), and eel (Anguilla bicolor). Some people in the area have also developed the culture of several fish species, such as mahseer and catfish. However, there has been no eel rearing until now, although some locations around the Batang Toru River are suitable for freshwater fish aquaculture activities.

scholarly journals Developing the Ecological Footprint Assessment for a University Campus, the Component-Based Method

2021 ◽  
Vol 13 (17) ◽  
pp. 9928
Author(s):  
Salah Vaisi ◽  
Hooshmand Alizadeh ◽  
Werya Lotfi ◽  
Saleh Mohammadi
Keyword(s):  
Human Activities ◽  
Ecological Footprint ◽  
Assessment Tool ◽  
Human Impacts ◽  
Electricity Consumption ◽  
Resource Depletion ◽  
University Campus ◽  
University Campuses ◽  
Waste Production ◽  
The Impact

Global warming has become an increasing challenge due to the impact of human activities on the environment. In this regard, university campuses with various activities and departments have a great impact on the environment. Ecological Footprint Analysis (EFA) is a natural resource depletion assessment tool, with a high level of accuracy, that measures the impact of human activities on the environment. Considering the Ecological Footprint (EF) capabilities, this study developed a method to assess the environmental impacts of a university campus using component-based parameters. The goals of the study are to explore the effective components of EF and to propose some policy guidelines to diminish the human impacts on the environment on university campuses. Five components, including natural gas and electricity consumption, water and food usage, and waste production, were measured in a survey from 2013 to 2016 at the building scale. The mean EF of the campus was 16,484 global hectares (gha). Fossil fuel energy had the highest level of environmental impact with 70.73%, followed by waste production and food and water usage with 26.87%, 1.28%, and 1.12%, respectively. The results demonstrate that the EF Index (EFI) of the case study campus was −0.82, which reveals an unsustainable performance. The EF results were illustrated on an Ecological Footprint Map (EFM), which shows the east and west parts of the camps were more unsustainable.

Sign in / Sign up

Export Citation Format

Share Document