scholarly journals Integration of Constructed Floodplain Ponds into Nature-Like Fish Passes Supports Fish Diversity in a Heavily Modified Water Body

Water ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1018
Author(s):  
Joachim Pander ◽  
Christoffer Nagel ◽  
Juergen Geist
Keyword(s):  
Salmo Trutta ◽  
Fish Community ◽  
Habitat Characteristics ◽  
Fish Diversity ◽  
Target Species ◽  
Habitat Types ◽  
Cottus Gobio ◽  
Barbus Barbus ◽  
Main River ◽  
Important Habitat

Fish passes facilitate fish movement in fragmented river systems, yet they can also provide important habitat functions. This study investigated the fish community composition of different constructed habitat types (fluvial habitats, floodplain ponds) within fish passes in relation to habitat characteristics in order to deduce recommendations for fish-friendly designs of such structures. Fish community structures within passes differed significantly from those in the main river, comprising a high number of rheophilic species in fluvial habitats (Thymallus thymallus, Hucho hucho, Salmo trutta, Cottus gobio, Chondrostoma nasus, and Barbus barbus), and of stagnophilic species in floodplain ponds (Rhodeus amarus, Scardinius erythrophthalmus, Misgurnus bipartitus, and Tinca tinca). During summer, floodplain ponds also provided important juvenile habitats for the target species C. nasus and B. barbus. Differences between the two habitat types in fish abundance were mostly explained by differences in macrophyte coverage, gravel, boulders, temperature, and current speed. The findings of this study stress the important habitat functions of fish passes. They also suggest that integration of diverse habitat structures, especially of currently hardly considered constructed floodplain ponds into fish passes, can greatly enhance their fish communities and contribute to the restoration of several declining target species of conservation.

scholarly journals Ichthyofaunal Diversity and Physico-Chemical Factors of Melamchi River, Sindhupalchok, Nepal

2016 ◽  
Vol 21 (1) ◽  
pp. 10-18
Author(s):  
Abha R. Mishra ◽  
Chitra Bahadur Baniya
Keyword(s):  
Fish Species ◽  
Fish Community ◽  
Diversity Index ◽  
Chemical Properties ◽  
Habitat Characteristics ◽  
Fish Diversity ◽  
Physico Chemical ◽  
Chemical Factors ◽  
High Level

The fish community and physico-chemical properties at five sites of Melamchi River were studied monthly from January 2011 to December 2013.    Melamchi River is one of tributaries larger Indrawati River basin, originates from the high snowy Jugal Mountain (5,875 m asl). Eleven fish species within two orders and five families were recorded.   Cypriniformes  was  found  to  be  the  most  dominant  order  with  ten  fish  species. Schizothorax plagiostomus  was the most common fish species followed by  Neolissochilus hexagonolepis, and  Psilorhynchus pseudecheneis.  Shannon Wiener fish diversity index and species richness recorded were highest at site 2 and lowest at site 5, whereas, evenness index was highest at site 3. The cluster analysis revealed  that  similarity  between  fish  species  decreased  as  the  distance  between  the  sites  increased.  Fish species were found distributed among four groups with respect to the significant habitat characteristics in the redundancy analysis (RDA). River water was found well-oxygenated and alkaline at all sites. However, high level for turbidity (43.25/ NTU) was observed at site 5, which exceeded compliance levels of WHO indicating the influence of intensive agriculture and deforestation along river area. To improve fish diversity and water quality of this river proper monitoring and management are an urgent need.Journal of Institute of Science and TechnologyVolume 21, Issue 1, August 2016, Page: 10-18

scholarly journals Past, present and future of the fish community of Lake Orta (Italy), one of the world’s largest acidified lakes

2016 ◽  
Vol 75 (s2) ◽  
Author(s):  
Pietro Volta ◽  
Norman D. Yan ◽  
John M. Gunn
Keyword(s):  
Fish Species ◽  
Salmo Trutta ◽  
Fish Community ◽  
Cold Water ◽  
Salvelinus Alpinus ◽  
Arctic Charr ◽  
Anguilla Anguilla ◽  
Coregonus Lavaretus ◽  
Cottus Gobio ◽  
Sampling Campaign

<p>Since 1926, the fishes in Lake Orta, one of Italy’s deepest natural lakes, were heavily damaged by profundal hypoxia and acidification linked to oxidation of ammonia from industrial effluents and by industrial metal pollution. Of the original 28 fish species, only perch survived the lake’s contamination. Recently, the water quality of the lake has been largely restored by reductions in pollutant inputs, and a massive liming intervention. These interventions restored fish habitat, but it is unclear whether the recent fish reintroductions were successful, and the present status of the fish community is unknown.  Here we reviewed the history of the Lake Orta fish assemblage. Using an extensive 2014 sampling campaign, we compared the present fish community to both its pre-pollution composition and to the assemblages of nearby un-polluted, but otherwise similar lakes, Lake Mergozzo and Lake Maggiore. While nearshore fish density now appears normal in lake Orta, the open water community remains impoverished both in numbers and in species. Epilimnetic and hypolimnetic benthic nets were dominated by perch and roach in all the three lakes, but the catch of pelagic nets differed among lakes. Perch (<em>Perca fluviatilis)</em>, rudd (<em>Scardinius erythrophthalmus)</em> and brown trout (<em>Salmo trutta</em>) dominated in Lake Orta while shad (<em>Alosa fallax lacustris</em>) and coregonids (<em>Coregonus</em> spp.) were dominant in the open waters of the other two lakes, but missing from Lake Orta.  Many fully or partially migratory species, including marble trout (<em>Salmo trutta marmoratus)</em>, eel (<em>Anguilla Anguilla)</em> and barbel (<em>Barbus plebejus)</em> were also missing from Lake Orta, a consequence of their initial extirpation and blocked re-colonization routes along the River Strona. In comparison with both pre-pollution and contemporary reference data, the fish community of Lake Orta has not been rehabilitated. The recovery of the littoral community is complete, but cold water species such as burbot (<em>Lota lota), </em>Arctic charr (<em>Salvelinus alpinus)</em> and bullhead (<em>Cottus gobio)</em> are still lacking, as are the pelagic zooplanktivores European whitefish (<em>Coregonus lavaretus)</em> and shad, which dominate offshore communities in the reference lakes, as they did a century ago in Lake Orta.  To propose priorities for fish community rehabilitation in Lake Orta, we categorized the conservation, ecological and fishing values of each missing fish species in the lake, and evaluated the cost and probability of success of the needed intervention for each species. This analysis indicated that rehabilitation of shad and European whitefish should receive highest priority.</p>

scholarly journals The Contribution of Different Restored Habitats to Fish Diversity and Population Development in a Highly Modified River: A Case Study from the River Günz

Water ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 1202 ◽  
Author(s):  
Joachim Pander ◽  
Juergen Geist
Keyword(s):  
Habitat Restoration ◽  
Fish Diversity ◽  
Population Development ◽  
Target Species ◽  
Endangered Fish ◽  
Barbus Barbus ◽  
High Conservation ◽  
Chondrostoma Nasus ◽  
River Dynamic ◽  
Riverine Fish

Despite of structural deficits, highly modified water bodies (HMWB) contain remnant populations of endangered fish that have high conservation value. Restoration in HMWBs underlies different principles when compared to natural rivers because of impaired river dynamic processes. The objective herein was to assess the contribution of restored habitats of the River Günz, Germany to fish diversity and restoration success of target species. All habitat restoration types, including bank habitats, fast flowing habitats with gravel, structured shallow water zones, nature like fish passes, and a former river course below a spillway were assessed. None of them comprised the full set of 27 fish species or size classes, indicating that the diversity and interlinkage of the restored habitats is most crucial to sustainable fish populations and high biodiversity. When considering the rheophilic target species Chondrostoma nasus and Barbus barbus, only fish passes and the former river course with their high flow current contributed much to their population development, particularly to young specimens <20 cm. The results of this study indicate that measures inside the main channel are unlikely to mitigate deficiencies in HMWBs concerning specialized riverine fish. Instead, interlinkage of a diversity of restoration measures and investment of resources for restoration in HMWBs into nature-like fish passes or former river courses below spillways with dynamically managed discharges seem most useful.

Modelling habitat requirement of European fishes: do species have similar responses to local and regional environmental constraints?

2005 ◽  
Vol 62 (1) ◽  
pp. 163-173 ◽  
Author(s):  
D Pont ◽  
B Hugueny ◽  
T Oberdorff
Keyword(s):  
Salmo Trutta ◽  
Explanatory Power ◽  
Regional Scale ◽  
Drainage Area ◽  
Environmental Constraints ◽  
Data Set ◽  
Continuous Increase ◽  
Cottus Gobio ◽  
Species Response ◽  
Barbus Barbus

To test the hypothesis that different species have similar responses to local and regional environmental constraints, we modelled the occurrences of 13 species using a data set of 413 undisturbed river reaches. Three environmental descriptors were considered at the local scale (river slope, river width, and upstream drainage area) and three at the regional scale (mean annual and mean range air temperature and basin unit). Using multiple logistic regression modelling techniques, we correctly predicted the occurrence of 11 of the 13 retained species. The hierarchical partitioning analysis that we used allowed us to jointly consider all possible models in a multiple regression setting and to evaluate the independent explanatory power of each of our five environmental variables. We reject the hypothesis of a common species response to the environmental constraints. Species inhabiting upstream river reaches (bullhead (Cottus gobio), brown trout (Salmo trutta), minnow (Phoxinus phoxinus), and stone loach (Barbatula barbatula)) are more sensitive to basin unit. All species representative of downstream areas (barbel (Barbus barbus), dace (Leuciscus leuciscus), chub (Leuciscus cephalus), gudgeon (Gobio gobio), roach (Rutilus rutilus), bleak (Alburnus alburnus), and perch (Perca fluviatilis)) exhibit a positive continuous response to the drainage area, in agreement with the view of a continuous increase of local richness downstream. River slope is an important variable for all species. Main species habitat requirements are discussed for each species.

Colonization and establishment of Pomphorhynchus laevis (Acanthocephala) in an isolated English river

1996 ◽  
Vol 70 (1) ◽  
pp. 27-31 ◽  
Author(s):  
C.R. Kennedy
Keyword(s):  
Salmo Trutta ◽  
Anguilla Anguilla ◽  
Pomphorhynchus Laevis ◽  
Cottus Gobio ◽  
Barbus Barbus ◽  
New Localities ◽  
Present Distribution ◽  
Gravid Females ◽  
Successful Colonization ◽  
Preferred Hosts

AbstractThe successful colonization, establishment and spread of Pomphorhynchus laevis in a small, isolated, Devon river 128 km from the parasite's nearest focus in Dorset was followed over 11 years from 1985. The parasite was first detected in Anguilla anguilla and Platichthys flesus in 1988: by 1995 it had attained prevalence levels of 22.6% in A. anguilla and 43.6% in P. flesus and also occurred in 100% Salmo trutta, 50% Cottus gobio and Noemacheilus barbatulus. As judged by prevalence, abundance, proportion of females gravid and weight of gravid females, S. trutta was the preferred definitive host although C. gobio was a suitable host and may play a role in cycling the parasite: the other three species were unsuitable hosts. The intermediate host was the freshwater Gammarus pulex: the euryhaline G. zaddachi was not infected. On biological grounds, the P. laevis could be assigned to the English freshwater strain and was almost certainly introduced to the river by anthropochore stocking of S. trutta from a Dorset hatchery. The findings demonstrate conclusively that the English strain of P. laevis can colonize and establish in a new locality from which Leuciscus cephalus and Barbus barbus, its normal preferred hosts, are absent and use S. trutta instead. The results also confirm that P. laevis is a poor natural colonizer and appears always to be introduced to new localities by anthropochore transfers of fish. The implications of these conclusions for understanding the present distribution of P. laevis are discussed and it is considered that they provide direct evidence in support of the hypothesis that P. laevis was introduced to Ireland from England and subsequently adapted to use of S. trutta and G. duebeni there.

scholarly journals Fish Community Assemblages of Mining-Impacted Freshwaters at Prestea, Ghana

2018 ◽  
pp. 1-9
Author(s):  
Osei O. Antobre ◽  
Nat Owusu-Prempeh ◽  
Michael J. Twumasi-Ankrah
Keyword(s):  
Fish Community ◽  
Average Length ◽  
Mesh Size ◽  
Fish Diversity ◽  
Freshwater Ecosystem ◽  
Fish Community Structure ◽  
Average Width ◽  
H Index ◽  
Community Assemblage ◽  
Fish Samples

The study evaluated the fish community assemblage in the sections of the Subri river, the Ankobra river, and the “galamsey” pond within the Prestea community as impacted by alluvial mining activities. Gill nets of length 10 m and mesh size 1.27 cm were used to trap fish of average length 25.25 cm whilst cane baskets were used to trap fish of average width 10.40 cm using the catch and recapture method. All the 46 fish samples identified belong to 10 genera and 5 families. The Chichlidae was the dominant family, accounting for 60% of the total families observed. With an H’ index of 1.57 the Subri river had the most fish diversity in comparison with the Ankobra river and the “galamsey” pond, which had 1.21 and 0.71, respectively. Similarly, the Subri river had a more complex fish community structure than the Ankobra and “galamsey” pond. The dominant species, Oreochromis niloticus, has not yet been evaluated by the IUCN, but the least dominated Brienomyrus brachyistus could be regarded as “least concern”. Notwithstanding, these fish are essential for food by the local communities. There is a possibility that the alluvial mining might have influenced the complexities of fish species communities. Thus conservation efforts must be promoted to sustain fish communities and overall freshwater ecosystem health.

scholarly journals Die plantgemeenskappe van die Ba-landtipe in die Mooirivieropvanggebied, Transvaal

1991 ◽  
Vol 10 (2) ◽  
pp. 85-92 ◽  
Author(s):  
H. Bezuidenhout
Keyword(s):  
Nature Conservation ◽  
Plant Communities ◽  
Soil Type ◽  
Habitat Characteristics ◽  
Clear Distinction ◽  
Conservation Practices ◽  
Numerical Classification ◽  
Habitat Types ◽  
Land Type ◽  
Vegetation Gradients

The aim of this study was to identify, characterize and interpret ecologically, by using habitat characteristics, the major vege­tation units and their variations of the Ba land type. Six plant communities were successfully distinguished through applying a numerical classification (TWINSPAN) and Braun-Blanquet procedures. The plant communities could easily be correlated with specific habitat types. A clear distinction could be made between plant communities of the upland and lowland areas. Vegetation gradients and associated gradients in habitat were identified by using an ordination technique (DECORANA). The studv emphasized the importance of topography and soil type for the delimitation of management units for farming or nature conservation practices.

scholarly journals Plantegroeiklassifikasie van die A-landtipe van die Mooirivier - opvanggebied, Transvaal

1991 ◽  
Vol 10 (1) ◽  
pp. 4-10
Author(s):  
H. Bezuidenhout
Keyword(s):  
Nature Conservation ◽  
Plant Communities ◽  
Soil Type ◽  
Habitat Characteristics ◽  
Clear Distinction ◽  
Conservation Practices ◽  
Numerical Classification ◽  
Habitat Types ◽  
Land Type ◽  
Vegetation Gradients

The aim of this study was to identify, characterize and interpret ecologically, by using habitat characteristics, the major vege­tation units and their variations of the A land type. Five plant communities were successfully distinguished by applying a numerical classification and Braun-Blanquet procedures. The plant communities could easily be correlated with specific habitat types. A clear distinction could be made between plant communities of the upland and lowland areas. Vegetation gradients and associated gradients in habitat were identified by using an ordination technique. The study emphasized the importance of topography and soil type for the delimitation of management units for farming or nature conservation practices.

Movement and home range of brown trout, Salmo trutta Linnaeus, in the Aberfeldy River, Victoria

1980 ◽  
Vol 31 (6) ◽  
pp. 837 ◽  
Author(s):  
PD Jackson
Keyword(s):  
Home Range ◽  
Brown Trout ◽  
Age Structure ◽  
Salmo Trutta ◽  
Restricted Range ◽  
Main River ◽  
Brown Trout Salmo Trutta

Studies of the movement of marked brown trout in a section of the Aberfeldy River between 31 January 1972 and 6 February 1974 showed that the home range of 1 + and older trout was about 60 m of river; that of 0 + fish was about 370 m. Some fish strayed outside this restricted range. The age structure of trout populations in sections of the Aberfeldy River at different times of the year suggests that 0 + fish moved up-stream into small tributaries but did not spawn there. The trout probably spawned throughout the main river.

scholarly journals Fish diversity of floodplain lakes on the lower stretch of the Solimões River

2004 ◽  
Vol 64 (3a) ◽  
pp. 501-510 ◽  
Author(s):  
F. K. Siqueira-Souza ◽  
C. E. C. Freitas
Keyword(s):  
Species Richness ◽  
Fish Community ◽  
River Flow ◽  
Abundant Species ◽  
Floodplain Lakes ◽  
Fish Diversity ◽  
The Town ◽  
Solimões River

The fish community of the Solimões floodplain lakes was studied by bimonthly samples taken from May 2001 to April 2002. These were carried out at lakes Maracá (03º51'33"S, 62º35'08,6"W), Samaúma (03º50'42,1"S, 61º39'49,3"W), and Sumaúma and Sacambú (03º17'11,6"S and 60º04'31,4"W), located between the town of Coari and the confluence of the Solimões and Negro rivers. Collections were done with 15 gillnets of standardized dimensions with several mesh sizes. We collected 1,313 animals distributed in 77 species, belonging to 55 genera of 20 families and 5 orders. Characiformes was the most abundant Order, with a larger number of representatives in the Serrasalmidae and Curimatidae. The most abundant species in the samplings were Psectrogaster rutiloides (132 individuals), Pigocentrus nattereri (115 individuals), and Serrasalmus elongatus (109 individuals). Lakes Samaúma, Sacambú, and Sumaúma were adjusted to logarithmic and lognormal series. The diversity exhibited an inverse gradient to the river flow, showing the highest diversity at Lake Sumaúma, followed by Samaúma, Sacambú, and Maracá. Species richness estimated through the jackknife technique ranged from 78 to 107 species.

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