scholarly journals A Contraction Based Solution for the Improvement of Fish Ladder Attraction Flow

2021 ◽  
Vol 7 (2) ◽  
pp. 57
Author(s):  
Kristian Angele ◽  
Patrik Andreasson ◽  
Ake Forssen ◽  
David Aldven ◽  
Gustav Hellstrom ◽  
...  
Keyword(s):  
Fish Ladder

scholarly journals Evaluation of fish passage through the Igarapé Dam fish ladder (rio Paraopeba, Brazil), using marking and recapture

2007 ◽  
Vol 5 (2) ◽  
pp. 233-236 ◽  
Author(s):  
Carlos Bernardo Mascarenhas Alves
Keyword(s):  
Power Plant ◽  
Retention Time ◽  
Fish Community ◽  
Thermal Power ◽  
Fish Passage ◽  
Home Ranges ◽  
Community Studies ◽  
Tag Retention ◽  
Fish Ladder ◽  
Pimelodus Maculatus

Rio Paraopeba, a tributary of rio São Francisco, has a six-meter high dam, built in 1978 to divert water to the Igarapé Thermal Power Plant. In 1994, a fish ladder was built at this dam. The results of a marking and recapture program carried out along rio Paraopeba between 1997 and 2001 are described, using information from fish community studies conducted at ten sampling stations between 1994 and 1997. These investigations showed the presence of at least 91 species in the river. During four rainy seasons between 1997 and 2000, fish were caught downstream of the dam, marked with external plastic tags, and immediately released at the same site. The objective was to evaluate fish passage through the ladder, based on recapture information from artisanal and sport fishermen. A total of 3,642 specimens were marked, adding up to a biomass of approximately 1.33 tons. Twenty-six species were used, representing 28.5% of the total recorded richness (91 species). Maximum recorded tag retention time was 10 months. Total recapture rate was 4.37% in four years, reaching 5.75% in the last period (2000-2001). Of all recaptured specimens, 14.0% were caught upstream of the dam, evidencing passage through the ladder. The specimens recaptured upstream of the dam belonged to three species: piau-verdadeiro (Leporinus obtusidens), mandi-amarelo (Pimelodus maculatus) and curimatá-pioa (Prochilodus costatus). These species showed linear home ranges of 15.4, 81.5 and 232.0 km, respectively. Most recaptures occurred immediately downstream of the dam, one of the most intensely fished stretches of rio Paraopeba.

scholarly journals Comparing on site human and video counts at Igarapava fish ladder, south eastern Brazil

2006 ◽  
Vol 4 (2) ◽  
pp. 291-294 ◽  
Author(s):  
Mark D. Bowen ◽  
Simone Marques ◽  
Luiz G. M. Silva ◽  
Volney Vono ◽  
Hugo P. Godinho
Keyword(s):  
Fish Species ◽  
Accurate Method ◽  
Fish Passage ◽  
Southeastern Brazil ◽  
Human Observer ◽  
Full Spectrum ◽  
Prochilodus Lineatus ◽  
Number Of Species ◽  
Fish Ladder ◽  
Number Of Individuals

On site human observations and video images were collected and compared at the window of the Igarapava Dam fish ladder (IDFL), rio Grande , Southeastern Brazil, between March 1st and June 30th, 2004. We conducted four experiments with two humans (Observer 1 and Observer 2) observing fish passage in the IDFL window while a Sony 3CCD video camera (Observer 3) recorded fish passage at the same time. Experiments, each one hour in length, were distributed throughout the diel cycle using full spectrum lights. We identified fish species, the number of individuals for each species, and the real time that they passed. Counts from each human observer were compared to the video counts. The fish species most commonly observed in the window were - curimba (Prochilodus lineatus), mandi-amarelo (Pimelodus maculatus), piau-três-pintas (Leporinus friderici) and ferreirinha (Leporinus octofasciatus). The number of species and individuals were indistinguishable for the three observers. But, the number of species and individuals were significantly different among experiments. Thus, the three observers register the same number of species and count the same number of individuals even when these two response variables differ significantly among experiments. Based on these results, we concluded that the video count was an accurate method to assess fish passage at the IDFL.

scholarly journals Anthropogenic impacts on Keshalia River, Eastern Nepal

2017 ◽  
Vol 7 (1) ◽  
pp. 105-111
Author(s):  
Jay Narayan Shrestha
Keyword(s):  
Anthropogenic Impact ◽  
Anthropogenic Impacts ◽  
Industrial Effluents ◽  
Fish Diversity ◽  
Dam Construction ◽  
Fish Ladder ◽  
Very High

The anthropogenic impact on Keshalia river, especially on fish diversity, is very high. Over fishing with unconventional fishing methods, disposal of domestic and industrial effluents, excess use of pesticides, dumping sites of municipalities, dam construction without fish ladder across the river and mining of sands and gravels are major anthropogenic impacts on the river.

scholarly journals [First occurrence of Sea Lamprey, Petromyzon marinus Linnaeus 1758 (Agnatha, Petromyzontiformes, Petromyzontidae) in the River Mignone (Northern Lazio).]

2021 ◽  
Vol 8 (1) ◽  
pp. 29-34
Author(s):  
Vincenzo Ferri ◽  
Paolo Crescia ◽  
Christiana Soccini ◽  
Alessio Olini ◽  
Stefano Celletti
Keyword(s):  
Endangered Species ◽  
Petromyzon Marinus ◽  
Sea Lamprey ◽  
Environmental Context ◽  
Upstream Migration ◽  
Rare And Endangered Species ◽  
Fish Ladder ◽  
First Occurrence ◽  
Rare And Endangered

[The spring presence of two individuals of the Sea lamprey, Petromyzon marinus, in the River Mignone near Tarquinia (Northern Lazio) could highlight a new Italian reproductive site of this rare and endangered species. This exceptional possibility could certainly be favored by the good quality of both the waters of the Mignone, and the environmental context of the record, but would require the urgent equipment of the barrier of Le Mole with a fish ladder in order to allow the sea lamprey’s upstream migration towards the areas of the upper course, even more suitable for their reproduction].   [Article in Italian]

Advances in Fisheries Bioengineering

2008 ◽  
Keyword(s):  
Swimming Speed ◽  
Critical Factor ◽  
Lake Sturgeon ◽  
Acipenser Fulvescens ◽  
Mean Velocity ◽  
Shovelnose Sturgeon ◽  
Pectoral Fins ◽  
Fish Ladder ◽  
Juvenile Sturgeon ◽  
Sturgeon Species

<em>Abstract</em>.—Fish ladder designs that pass adult sturgeons are poorly studied. This is partly due to difficulties associated with obtaining and testing large adults. To learn about behavior and swimming of sturgeons in fish ladder environments, we observed juvenile lake sturgeon <em>Acipenser fulvescens </em>to determine the type of ladder opening that fish passed best. We also constructed a short fish ladder (6% slope) using the best opening type and determined the general usefulness of the ladder design to pass juvenile lake sturgeon, pallid sturgeon <em>Scaphirhynchus albus </em>and shovelnose sturgeon <EM>S</EM>. <em>platorynchus</em>. Lake sturgeon swam upstream through orifice and vertical openings better than through surface weir or weir and orifice openings. Because 37% of the fish hit the orifice when swimming upstream, and also, sturgeon could be damaged passing downstream through an orifice, we focused on testing a ladder design with vertical openings. A side-baffle ladder design that created vertical openings that alternated from side to side showed promise at passing the three species of sturgeons. All lake sturgeons (<EM>N </EM>= 15), most pallid sturgeons (12 of 22 fish, 55%), and 1 of 3 shovelnose sturgeons ascended the side-baffle design. Also, all sturgeon species moved safely downstream in the side-baffle ladder by passively drifting tail-first. Mean velocity in side-baffle openings was 60–75 cm/s, so sturgeons could use prolonged swimming speed to swim upstream. Vertical openings were wide enough for fish to partially erect their pectoral fins, likely a critical factor for maintaining balance. Our observations suggest that a ladder for adults should have vertical openings, enable fish to swim continuously and not stop at cross-channel barriers, have resting areas, enable fish to safely drift downstream, and enable fish to swim upstream using prolonged swim speed. The study of juvenile sturgeon behavior and swimming ability can contribute to developing a fish ladder for adults. This approach to fish ladder development can be used for other species with large adults.

scholarly journals Escapement of Broodstock Chinook Salmon From Whitlock Bay Spawning Station, Lake Oahe, South Dakota

2020 ◽  
Vol 9 (1) ◽  
pp. 18
Author(s):  
Dylan A Gravenhof ◽  
Michael E Barnes ◽  
Robert Hanten
Keyword(s):  
South Dakota ◽  
Chinook Salmon ◽  
Oncorhynchus Tshawytscha ◽  
Tag Retention ◽  
Tag Loss ◽  
Fish Ladder

Feral spawning fall Chinook salmon (Oncorhynchus tshawytscha) in Lake Oahe, South Dakota, are captured using a fish ladder and catch raceway at Whitlock Bay Spawning Station. The number of salmon that escaped the catch raceway and descended the fish ladder prior to spawning was unknown. During October 2017, all salmon that ascended the fish ladder at the spawning station were tagged. Tagged males remained in the catch raceway. Tagged females were moved to other secure raceways and used to estimate tag retention. Of the 383 tagged males, 159 (41.5%) were initially designated as escaped from the catch raceway. Tag loss in the females was 3.9%. Thus, the estimated male salmon escapement rate from the catch raceway was 37.6%. Male salmon remained in the catch raceway for one-to-three days before escaping. The escapement rate decreased over the month-long spawn, with nearly 60% of the males going back down the fish ladder in the first week of October, compared to less than 20% escapement by the final week. Such high rates of escapement from the spawning station may be negatively impacting the spawning efficiencies. Possible solutions include re-engineering of the fish ladder or daily removal of the salmon in the catch raceway to other more secure locations at the spawning station.

scholarly journals Update on the ichthyofauna of the Piquiri River basin, Paraná, Brazil: a conservation priority area

2018 ◽  
Vol 18 (2) ◽  
Author(s):  
Daiane Cavalli ◽  
Augusto Frota ◽  
Angelica Dorigon Lira ◽  
Éder André Gubiani ◽  
Vladimir Pavan Margarido ◽  
...  
Keyword(s):  
River Basin ◽  
Fish Species ◽  
Native Species ◽  
Conservation Priority ◽  
Fish Resources ◽  
Fish Ladder ◽  
Abstract Knowledge ◽  
Vectors Of Introduction ◽  
Minimum Requirements ◽  
Fish Species Composition

Abstract: Knowledge of the fish species in river basins is among the minimum requirements for the management of water and fish resources. Therefore, the aim of this study was to update the fish species composition of the Piquiri River basin, upper Paraná River basin. Data were gathered from recent information published in specialized literature and records for ichthyology collections. This update reports the occurrence of 152 fish species distributed in 8 orders, 31 families, and 89 genera. Non-native species accounted for 20% of all species, and the construction of the Itaipu Power Plant and its fish ladder were the main vectors of introduction. Three percent of the species were endangered, and 11% were classified as migratory. The Piquiri River basin harbors a large number of species, some of which are rare, endangered, migratory, endemic, and even unknown by science. Because of this, maintaining the integrity of this river basin will support the persistence of regional biodiversity.

scholarly journals Reynolds shear-stress and velocity: positive biological response of neotropical fishes to hydraulic parameters in a vertical slot fishway

2012 ◽  
Vol 10 (4) ◽  
pp. 813-819 ◽  
Author(s):  
Bernardo Alan de Freitas Duarte ◽  
Isabella Cristina Resende Ramos ◽  
Hersília de Andrade e Santos
Keyword(s):  
Shear Stress ◽  
Fish Species ◽  
Velocity Fluctuation ◽  
Reynolds Shear Stress ◽  
Neotropical Fishes ◽  
Fish Ladder ◽  
Vertical Slot ◽  
Structure Of Flow ◽  
Vertical Slot Fishway ◽  
Pimelodus Maculatus

The barriers created by dams can cause negative impacts to aquatic communities, and migratory fish species are directly affected. Fishways have been developed to allow the upstream passage of fishes through dams. In Brazil, after the implementation of environmental laws, these structures have been built based on European and American fishway designs. Studies have shown selectivity for different neotropical fishes in some Brazilian fishways, and the main challenge has been to promote upstream passage of a large number of diverse fish species. The patterns of flow circulation within the fish ladder may explain fish selectivity although few studies detail the fish response to hydraulic characteristics of fish ladder flow. This paper presents a laboratory study, where a vertical slot fishway was built in a hydraulic flume and the behavior of two neotropical fish species (Leporinus reinhardti and Pimelodus maculatus) were analyzed. The structure of flow was expressed in terms of mean velocity, Reynolds shear-stress and velocity fluctuation fields. The individuals of Leporinus reinhardti had higher passage success than Pimelodus maculatus in the laboratory flume. Both species preferred areas of low to zero Reynolds shear-stress values. In addition, different preferences were observed for these species concerning the horizontal components of velocity fluctuation.

16.P9. Fish ladder selects biological traits in upstream migrating curimbata, Prochilodus lineatus

2007 ◽  
Vol 148 ◽  
pp. S71-S72
Author(s):  
G.L. Volpato ◽  
R.E. Barreto ◽  
A.L. Marcondes ◽  
P.S.A. Moreira ◽  
M.F.B. Ferreira
Keyword(s):  
Biological Traits ◽  
Prochilodus Lineatus ◽  
Fish Ladder
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