scholarly journals The Species Composition and Distribution Patterns of Non-Native Fishes in the Main Rivers of South China

2020 ◽  
Vol 12 (11) ◽  
pp. 4566
Author(s):  
Dang En Gu ◽  
Fan Dong Yu ◽  
Yin Chang Hu ◽  
Jian Wei Wang ◽  
Meng Xu ◽  
...  
Keyword(s):  
Species Composition ◽  
Fish Species ◽  
South China ◽  
Management Practices ◽  
Distribution Patterns ◽  
Freshwater Ecosystems ◽  
Native Fish ◽  
Species Number ◽  
Feeding Strategies ◽  
Native Fishes

Non-native fish invasions are among the greatest threats to the sustainability of freshwater ecosystems worldwide. Tilapia and catfish are regularly cultured in South China which is similar to their climate in native areas and may also support their invasive potential. We systematically collected fish from eight main rivers of South China, from 2016 to 2018, to investigate and analyse species’ composition and the distribution of non-native fishes. The data reveal that non-native fishes are widespread and abundant in the sampled rivers: of the 98,887 fish collected, 11,832 individuals representing 20 species were not native, which were distributed in the 96% sampled sites. Of the non-native fish species, 17 are used in aquaculture and 19 are native to the tropics; 13 are omnivores while the other seven are predators. Based on dissimilarity of the non-native fish species distributions across the eight rivers, the different rivers could be divided into four assemblages. Geographical isolation and temperature were identified as affecting the distribution patterns of non-native fishes, thereby influencing fish species composition, species number, dominant species, and distribution variations in the South China rivers. Species composition of the non-native fishes in these rivers are related to their introduction vector, compatibility with their native habitat, and feeding strategies. Their distribution was mainly influenced by geographical location and temperature. To mitigate the impacts of non-native fish, a series of stricter management practices, systematic monitoring, and more research are needed.

scholarly journals Regional and Seasonal Differences in Species Composition and Trophic Groups for Tidepool Fishes of a Western Pacific Island – Taiwan

2018 ◽  
Vol 23 (1) ◽  
pp. 1 ◽  
Author(s):  
Colin K. C. Wen ◽  
Li-Shu Chen ◽  
Kwang-Tsao Shao
Keyword(s):  
Species Composition ◽  
Fish Species ◽  
Fish Assemblages ◽  
Coastal Development ◽  
Species Number ◽  
Pacific Region ◽  
Trophic Groups ◽  
Species Numbers ◽  
Intertidal Fish ◽  
Intertidal Fishes

Spatial and temporal variations in the species composition of assemblages are common in many marine organisms, including fishes. Variations in the fish species composition of subtidal coral reefs have been well documented, however much less is known about such differences for intertidal fish assemblages. This is surprising, given that intertidal fishes are more vulnerable to terrestrial human disturbances. It is critical to evaluate the ecology and biology of intertidal fishes before they are severely impacted by coastal development, especially in developing countries such as those in the tropical western Pacific region where coastal development is rapidly increasing. In this study, we investigated the species composition, abundance, biomass and species number (richness) for intertidal fish assemblages in subtropical (northern) and tropical (southern) Taiwan across four seasons by collecting fishes from tidepools using clove oil. We also examined the gut contents of collected fishes to identify their trophic functional groups in order to investigate regional and seasonal variations for different trophic groups. We found significant differences in the species composition of tidepool fish assemblages between subtropical and tropical Taiwan. Bathygobius fuscus, Abudefduf vaigiensis and Istiblennius dussumieri were dominant species in subtropical Taiwan, whereas Bathygobius coalitus, Abudefduf septemfasciatus and Istiblennius lineatus were dominant in tropical Taiwan. Other species such as Bathygobius cocosensis, Abudefduf sordidus and Istiblennius edentulus were common in both regions. For trophic groups, omnivores and detritivores had or showed trends towards higher species numbers and abundances in the subtropical region, whereas herbivores, planktivores and general carnivores had or showed trends towards higher species numbers and biomass in the tropical region. Overall, many intertidal fish species and trophic groups showed differences in abundance, biomass and species number between subtropical and tropical Taiwan. Further studies on large scale geographical gradients in trophic groups and species compositions in the Indo-west Pacific region are encouraged to assist with ecosystem monitoring and assessment. Keywords: Intertidal fishes, spatio-temporal pattern, feeding guild, diet

scholarly journals The first unified inventory of non-native fishes of the South Caucasian countries, Armenia, Azerbaijan, and Georgia

2021 ◽  
pp. 32
Author(s):  
Tatia Kuljanishvili ◽  
Levan Mumladze ◽  
Bella Japoshvili ◽  
Namig Mustafayev ◽  
Shaig Ibrahimov ◽  
...  
Keyword(s):  
Black Sea ◽  
Fish Species ◽  
Caspian Sea ◽  
Native Species ◽  
Biological Diversity ◽  
Native Fish ◽  
The Black Sea ◽  
The South ◽  
In The Wild ◽  
Native Fishes

The South Caucasus (SC) region is recognized for its high biological diversity and various endemic animal taxa. The area has experienced many fish introductions over the years, but the overall information about non-native fishes in the three SC countries, Armenia, Azerbaijan, and Georgia did not exist. Although these three countries belong to the Kura River drainage, Caspian Sea basin (only the western half of Georgia drains into the Black Sea), the legislative framework for each country regarding introduction of non-native fish species and their treatment is different and poorly developed. The goal of the present study was to make an initial inventory of non-native fish species in the three SC countries, and summarize the existing knowledge as a basis for future risk assessment models and formulation of regional management policies. Here, we present a unified list of 27 non-native species recorded in the wild in Armenia, Azerbaijan, and Georgia. Among these 27 species, eight were translocated from the Black Sea basin to the Caspian Sea basin. Out of these 27 non-native fishes, 15 species have become established (three of them being considered invasive) and six fish species could not survive in the wild.

scholarly journals Distribution and Trophic Pattern of Non-Native Fish Species Across the Liao River Basin in China

Water ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 1217
Author(s):  
Kangshun Zhao ◽  
Chao Li ◽  
Tao Wang ◽  
Bowen Hu ◽  
Min Zhang ◽  
...  
Keyword(s):  
River Basin ◽  
Fish Species ◽  
Socioeconomic Development ◽  
Anthropogenic Activities ◽  
Trophic Levels ◽  
Native Fish ◽  
Southeastern Part ◽  
Basin Scale ◽  
Different Types ◽  
Native Fishes

Controlling the invasion of non-native fish species necessitates a complete understanding of the distribution of these species and the key factors that influence such distribution. In order to research the situation of non-native fish and the relevant influencing factors in the Liao River Basin, we investigated and analyzed the characteristics of the distribution and the trophic levels of non-native fish species, as well their response to different types of factors in the basin. Nine non-native fish species were found during the investigation, and the trophic levels of these species ranged between 2.00 and 3.84. The results of generalized linear models indicate that the distribution of non-native fish species in the basin is mainly related to anthropogenic activities, socioeconomic development, and climate. The southeastern part of the Liao River Basin is conducive to the distribution of non-native fish species. Furthermore, on a spatial scale, we also found that the mean trophic level of non-native fish species was not correlated with anthropogenic activities and socioeconomic development in the Liao River Basin. By providing evidence for the links between non-native fishes and different types of factors, our study contributes to increasing the relevant references for and experiences in the early detection and management of non-native fishes on a basin scale.

scholarly journals Species composition and invasion risks of alien ornamental freshwater fishes from pet stores in Klang Valley, Malaysia

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Abdulwakil Olawale Saba ◽  
Ahmad Ismail ◽  
Syaizwan Zahmir Zulkifli ◽  
Muhammad Rasul Abdullah Halim ◽  
Noor Azrizal Abdul Wahid ◽  
...  
Keyword(s):  
Species Composition ◽  
Fish Species ◽  
Threshold Value ◽  
Freshwater Ecosystems ◽  
Ornamental Fish ◽  
Operating Characteristics ◽  
Fish Introduction ◽  
Non Invasive ◽  
Invasive Fishes ◽  
Klang Valley

Abstract The ornamental fish trade has been considered as one of the most important routes of invasive alien fish introduction into native freshwater ecosystems. Therefore, the species composition and invasion risks of fish species from 60 freshwater fish pet stores in Klang Valley, Malaysia were studied. A checklist of taxa belonging to 18 orders, 53 families, and 251 species of alien fishes was documented. Fish Invasiveness Screening Test (FIST) showed that seven (30.43%), eight (34.78%) and eight (34.78%) species were considered to be high, medium and low invasion risks, respectively. After the calibration of the Fish Invasiveness Screening Kit (FISK) v2 using the Receiver Operating Characteristics, a threshold value of 17 for distinguishing between invasive and non-invasive fishes was identified. As a result, nine species (39.13%) were of high invasion risk. In this study, we found that non-native fishes dominated (85.66%) the freshwater ornamental trade in Klang Valley, while FISK is a more robust tool in assessing the risk of invasion, and for the most part, its outcome was commensurate with FIST. This study, for the first time, revealed the number of high-risk ornamental fish species that give an awareness of possible future invasion if unmonitored in Klang Valley, Malaysia.

scholarly journals The Natural History of the Satellite Lakes of Lake Malawi

2019 ◽  
Author(s):  
George Turner ◽  
Benjamin P Ngatunga ◽  
Martin J Genner
Keyword(s):  
Fish Species ◽  
Adaptive Radiation ◽  
Management Practices ◽  
Fish Fauna ◽  
Lake Malawi ◽  
Model Systems ◽  
Native Fish ◽  
Fish Diversity ◽  
Crater Lakes ◽  
Cichlid Fishes

Large, long-lived lakes, such as Lake Baikal and the African Great Lakes are known for their diverse endemic faunas. Nearby smaller isolated lakes have long been hypothesised to facilitate allopatric speciation, such as Lake Nabugabo at the edge of Lake Victoria, helping seed the radiation in the large lakes. Furthermore, crater lakes, formed by volcanic activity are often deep, long-lived and relatively isolated, and often host a number of closely-related endemics, becoming model systems for testing theories of sympatric speciation and adaptive radiation, such as Lakes Barombi Mbo in Cameroon, and Apoyo in Nicaragua. Here we report on studies of 9 crater lakes in southern Tanzania: Lakes Ikapu, Ilamba, Itamba, Itende, Kingiri, Kyungululu, Masoko (=Kisiba), Ndwati and Ngozi, plus the shallow satellite lakes Chikukutu and Chilingali in central Malawi. Additional notes are presented about fish species present in nearby river systems. The lakes differ considerably in surface area, depth and water chemistry. No permanently aquatic animals were observed in Lake Ngozi, the largest of the lakes, nor in Lake Ndwati. All of the other 7 craters lakes were found to contain cichlid fishes, comprising a total of 29 populations of which 24 are considered likely to be native, many meriting recognition as distinct species. At least one lake (Masoko) contains a diverging pair of cichlid ecomorphs likely to be undergoing sympatric ecological speciation. Another case might be the dwarf and large ecomorphs of Rhamphochromis in Lake Kingiri. In addition, 4 crater lakes are reported to contain members of other fish families: Clariidae, Cyprinidae, Danionidae and Procatopodidae. The lakes also hosted a variety of macro-invertebrates, including crabs, bivalves and gastropods. There is evidence of repeated attempts to stock all of these lakes with non-native fish species, in at least one case leading to the establishment of breeding populations of two species. This represents a major threat to these unique ecosystems. In Malawi, Lakes Chilingali and Chikukutu were recently joined as a result of damming of the outflow of the former. This ‘large Chilingali’ hosted a diverse fish fauna, including two apparently endemic haplochromine cichlid fishes of the genera Lethrinops and Rhamphochromis. The lake was heavily fished and attempts had been made to stock cages for tilapia culture using non-native populations of species already present in the lake. However, the dam was allowed to erode and it finally collapsed in 2011-13, resulting in the restoration of the previous condition of two inter-connected lakes. Little is known of the pre-impoundment lakes, but post-collapse, the lakes became shallow and swampy, with apparently greatly reduced fish diversity. Neither endemic species could be found when the lakes were sampled in 2016. Our work has indicated that the satellite lakes of Lake Malawi are important reservoirs of biodiversity that can play a major role in our understanding of speciation and adaptive radiation, but they are fragile systems currently threatened by poor management practices including intentional stocking of non-native fish.

scholarly journals Increasing Establishment of Non-native Fish Species in the Seine River Basin: Insights From Medium- and Long-Term Approaches

2021 ◽  
Vol 9 ◽  
Author(s):  
Jérôme Belliard ◽  
Sarah Beslagic ◽  
Julien Boucault ◽  
Amandine Zahm
Keyword(s):  
River Basin ◽  
Fish Species ◽  
Native Species ◽  
Fish Communities ◽  
Freshwater Ecosystems ◽  
Native Fish ◽  
13Th Century ◽  
Seine River ◽  
Basin Scale ◽  
Seine River Basin

The spread of non-native species is nowadays recognized as a major threat to the biodiversity of freshwater ecosystems. However, for a very long time the introduction and acclimatization of new species has been perceived mainly as a source of wealth for human societies. Here, we examined the establishment of non-native fish species in the Seine River basin from a historical perspective by adopting a twofold approach. In a first step, at the whole basin scale, considering various written and archeological sources, we traced the chronology, over the last millennium, of the establishments of non-native species. In a second step, by analyzing fish monitoring from several hundred sites covering the diversity of rivers and streams, we examined the changes in numbers and abundance of non-native species in local fish communities over the last three decades. The first documented species introduction dates back to the 13th century but it is from the middle of the 19th century that the introduction attempts accelerated. Today, these introductions have reached an unprecedented level and 46% of the species recorded in the basin are non-native. During the last three decades, non-native species have continued to increase within fish communities both in terms of number of species and abundance of individuals. The most pronounced increases are noted on large rivers and sites where anthropic pressures are strong. Waterways connecting European basins, globalization of trade, and ongoing climate change provide a general background suggesting that the increase in the proportion of non-native species in the fish communities of the Seine River basin is likely to continue for several decades.

Fish species composition and community pattern in the continental shelf of northwestern South China Sea

2013 ◽  
Vol 33 (7) ◽  
pp. 2225-2235
Author(s):  
王雪辉 WANG Xuehui ◽  
林昭进 LIN Zhaojin ◽  
杜飞雁 DU Feiyan ◽  
邱永松 QIU Yongsong ◽  
孙典荣 SUN Dianrong ◽  
...  
Keyword(s):  
South China Sea ◽  
Species Composition ◽  
Continental Shelf ◽  
Fish Species ◽  
South China ◽  
Community Pattern ◽  
China Sea ◽  
Fish Species Composition

scholarly journals Baseline micronuclei and nuclear abnormalities frequencies in native fishes from the Paraná River (Argentina)

2014 ◽  
Vol 74 (1) ◽  
pp. 217-221 ◽  
Author(s):  
GNA Furnus ◽  
JD Caffetti ◽  
EM García ◽  
MF Benítez ◽  
MC Pastori ◽  
...  
Keyword(s):  
Fish Species ◽  
Peripheral Blood ◽  
Micronucleus Test ◽  
Paraná River ◽  
The Other ◽  
Native Fish ◽  
Nuclear Abnormalities ◽  
Parana River ◽  
Native Fishes

This work aims to establish baseline frequencies of micronuclei (MN) and nuclear abnormalities (NA) in native fish species collected in situ from the Paraná River. For this purpose, the micronucleus test was applied in peripheral blood erythrocytes from specimens obtained from samplings collected at two localities (Posadas and Candelaria, Misiones, Argentina) during the period 2007-2010. The results were statistically analyzed using the Kruskal Wallis test. Data from nine fish species were obtained, among which Steindachnerina brevipinna(Characiformes) revealed the highest baseline frequency of MN and NA, showing statistically significant differences with regard to the other analyzed species. These results are the first report of baseline MN and NA frequencies for native fish species studied and could be useful for future comparisons with data of fishes belonging to other environments.

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