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Topic: Fish pass

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Salmon

River Dee, Wales

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	DAMS, FISH AND FISHERIES- Opportunities, challenges and conflict resolution
		The critical point in upstream fish passage design is the location of the fish pass entrance and the attraction flow, which must take into account river discharge during the migration period and the behaviour of the target species in relation to the flow pattern at the base of the dam.
		Fish passing through hydraulic turbines are subject to various forms of stress likely to cause high mortality: probability of shocks from moving or stationary parts of the turbine (guide vanes, vanes or blades on the wheel), sudden acceleration or deceleration, very sudden variations in pressure and cavitation.
		Fish can be released upstream on the river in the spawning ground areas or transported to a hatchery, which is often the case for salmonids during the first stage of restoration programmes.
	www.fao.org /docrep/004/y2785e/y2785e03.htm (9079 words)

	Per Saxvik \| Bangladesh
		The requirement for fish pass facilities in aid of fish migration in the Northeast Region appears to be limited to the pre-monsoon period when adult fish need access from rivers to haors (in-migration) and from haors to rivers (out-migration).
		Fish passes or fishways are channels or series of pools installed to aid fish in overcoming natural or artificial obstacles to migration.
		Fish passes to be planned for at regulators and embankments between rivers and haors in the Northeast Region would be required to accommodate fluctuations in head water levels of up to 3-3.5 m during the pre-monsoon period.
	www.saxvik.ca /bangladesh/proposal.html (2897 words)

	Salmon Fish Counters in Ireland; Fish Passes
		Fish passes are often installed in rivers to aid migration past obstructions.
		Passes provide an excellent opportunity to count fish as they are guided through a narrow counting zone.
		Fish passage across the weir is facilitated by two passes, a Denil and a Pool Pass, built through the weir.
	www.fishcounter.com /fishpass.htm (348 words)

	icWales - Fish pass removes river's last obstacle to salmon migration (Site not responding. Last check: 2007-11-07)
		The fish pass, which will also allow brown trout and eels to make the journey above the weir, is only the second of its type in the UK and the first for Wales.
		It is known as a vertical slot pass, which slows the flow of water to a metre per second, well within the swimming abilities of the fish concerned.
		Water passes through a channel that is 36 metres in length and 2.5 metres in width, containing 11 pools, which are separated by a wall with a 30cm slot to allow fish to swim from one pool to another.
	icwales.icnetwork.co.uk /0100news/0200wales/content_objectid=13420675_method=full_siteid=50082_headline=-Fish-pass-removes-river-s-last-obstacle-to-salmon-migration-name_page.html (346 words)

	Fish gotta swim -- Wisconsin Natural Resources magazine
		Fish populations caught behind dams become isolated and fragmented, unable to tap the genetic diversity that contributes to a population's strength.
		Although unimpeded fish movement in rivers was recognized as important well over 150 years ago, technology developed to effectively pass fish around or through dams has been slow, with a lot of trial-and-error.
		Fish passage techniques may vary from changing a dam operation (for example, opening gates at critical periods) to a natural, sloped rock ramp, to a full-blown concrete structure.
	www.wnrmag.com /stories/2002/apr02/fishlad.htm (1845 words)

	Fish Friendly Dams
		Fish released at two other points showed similar survivals in both turbines, with 97 percent to 100 percent for fish at the hubs and 95 to 97 percent survival for smolts released at mid-blade.
		The greatest mortality was witnessed for fish released at the blade tip, with from 93.8 to 97.5 fish surviving through the MGR and from 90.8 to 95.6 percent surviving through the traditional turbine.
		Some fish are transported past the dams by barge and truck under the juvenile fish transportation program.River water circulates through the barges allowing the fish to imprint the chemicals and smells of the water during the trip downriver.
	www.saveourdams.com /fish_friendly_dams.htm (15485 words)

	Fish Passes help fish stocks (Site not responding. Last check: 2007-11-07)
		A revolutionary fish pass installed on the River Gaunless is reaping the rewards with the rejuvenation of sea trout and salmon stocks in this major tributary of the River Wear.
		The fish pass, which is built with local stone, is unusual because it is designed to look like a natural cascade over a series of small rock steps with intervening pools.
		The pass on the River Gaunless was installed in February 2002 and local fisheries officers are delighted at the results of the survey.
	www.ogmoreriver.com /news/fish-pass.php (433 words)

	Total-Fishing.com
		Fish delayed by the weir accumulated downstream where they were vulnerable to predation and seals were frequently seen taking salmon from below the weir.
		The fish pass is part of the Agency’s Fishing Wales Project, which is funded from the Welsh Assembly Government and the European Regional Development Fund (ERDF) through the Objective 1 Programme.
		In addition to the fish pass the Agency, in partnership with local anglers and the Pembrokeshire’s Rivers Trust are also delivering habitat improvements, which will benefit fisheries.
	www.total-fishing.com /News.asp?Action=View&ID=0B48BF02E74E4E8E8D25A14310BDD9DA (615 words)

	Environment Agency - Baffled Fish Pass (Site not responding. Last check: 2007-11-07)
		Most fish passes of this type use a rectangular channel with a series of precisely positioned and shaped plates or 'baffles'.
		These baffles redirect the water flowing down the fish pass channel thus reducing the average water velocity dramatically.
		These fish passes can operate at gradients of 20 or even 25% and are typically very efficient in terms of the amount of water required for efficient fish passage.
	www.environment-agency.gov.uk /commondata/103196/174014 (100 words)

	Salmon Leaping For Their Survival (Site not responding. Last check: 2007-11-07)
		Installed as part of a £33m flood protection scheme in a new weir in Kilkenny city, the new fish pass on the River Nore only appears to work when the river level is unusually high.
		The pass is like a channel in the weir, with a shallower slope and designed to slow the current to help the fish swim upstream.
		Fish can pass through when water levels are high - but this also means that repair works to add new rungs to the bottom of the pass cannot be done as it is too dangerous to work.
	www.flmnh.ufl.edu /fish/InNews/salmonleaping2005.html (728 words)

	Anglersnet Newsdesk
		Just 163 salmon and 1,104 sea trout managed to use the pass in 2001; thus we believe the public is being misled by the Environment Agency offering the widely varying "estimates" of 2,000 to 4,000 salmon and 11,000 to 15,000 sea trout entering the river.
		The other 90% of their "estimates" is derived from those fish said to be successfully progressing upstream via the boating-lock, the canoe-slalom, or by leaping the main gates.
		In fact based on the coarse fishing results the river is about to be classified as “A+”, a rating that places it as one of the finest fishing rivers in the country.
	www.anglersnet.co.uk /news/articles/117.html (971 words)

	Design and Modelling of Padiham Canoe and Fish Pass by BHR Group
		The pass was to allow the safe migration of fish upstream to spawn, together with the provision of a 'fish friendly' environment.
		The models were used to study the effect of the bifurcated channel on upstream and downstream river levels and to assess the hydraulic performance of the multi-use pass with respect to the migration of fish upstream together with the creation of white water conditions suitable for canoeists.
		A programme of model testing was determined to assess the final design of the multi-use pass and adjoining river channel under specific flow conditions, including 1 in 100 year flood flows.
	www.bhrgroup.co.uk /cases/water09.htm (388 words)

	BBC NEWS \| Wales \| South West Wales \| Fish 'by-pass' boost for anglers
		The new pass is bad news for seals as they can regularly be seen feasting on the fish while they wait to swim up the Western Cleddau.
		But anglers say the pass will be a boost to local tourism because when it is completed more fishermen will visit the area as there will be a better chance of getting a bite.
		The pass, which is being built by the Environment Agency Wales, will allow fish to travel upstream at any time of the day.
	news.bbc.co.uk /1/hi/wales/south_west/3126800.stm (338 words)

	Waterford News & Star: An Bord Pleanála Told Fish Pass Would Have Negative Impact On Mill Complex (Site not responding. Last check: 2007-11-07)
		According to Paddy Matthews, Planning Officer with the National Heritage Council, the existing fish pass, which is not in use, is along with the canal and three wheel-pits, graded as being of key significance in the Conservation Plan.
		Fish were currently unable to bypass the weir because the fish pass was not operating, he said.
		But the Heritage Council believed the proposed development to redirect the river, would permanently reduce the flow of water into the canal which formerly served the mill complex, effectively rendering the existing fish pass redundant, in addition to reducing the significance of the wheel pits and the canal.
	www.waterford-news.ie /news/story.asp?j=9153 (574 words)

	Science World: Do fish pass gas?(Questions and Answers)(Brief Article)@ HighBeam Research (Site not responding. Last check: 2007-11-07)
		Yes, in a sense some fish do pass gas, though not in the same way humans do.
		The bubble trail from the back end of a fish results more from swimming at different water depths than, say, eating a can of beans, explains Ted Pietsch, an ichthyologist (fish expert) at the University of Washington in Seattle.
		Most fish depend on their swim bladder (a balloon-like, elongated body sac) to stay neutrally buoyant, or afloat, at any given depth.
	www.highbeam.com /library/doc0.asp?DOCID=1G1:60590064&refid=ip_encyclopedia_hf (164 words)

	Hazel's RV Park - Gilchrist, TX (Site not responding. Last check: 2007-11-07)
		Rollover Pass, also known as "Fish Pass", is a strait 200 foot wide, five to twelve foot deep, and 1,600 foot long channel across the upper Bolivar Peninsula; which links Rollover Bay and Galveston East Bay with the Gulf of Mexico in extreme northeastern edge Galveston County (at 29°00' N, 94°30' W).
		The pass is named for the practice of ship captains from the days of Spanish rule through prohibition,qv who, to avoid the Galveston customs station, rolled barrels of import or export merchandise over that part of the peninsula.
		I fish the Pass a considerable amount of time throughout the year, and have met a lot of good people from as far away as Canada.
	www.fishingworld.com /eLodge/TX/Gilchrist/HAZELSRVPARK/Amenities.tmpl (1289 words)

	Rivertec Pass Units
		Denil Mark 2 Modular Fish Pass Units - Side baffles for higher flows from 715 to 1428l/s.
		These units may also be fabricated in white polypropylene for use in close proximity to fish counter electrodes.
		Denil Type 19 Fish Pass Plates - Fabricated in Aluminium or for saline water Grade 316 Stainless Steel.
	www.fishways.freeserve.co.uk /rivertec.htm (712 words)

	DD031599
		The State of Texas constructed a fish pass after obtaining a permit from the U.S. Army Corps of Engineers.
		Beachfront property owners near the fish pass brought suit in federal court claiming that the pass contributed to dramatic erosion problems on their property.
		The court cites no discussion of any argument that the fish pass was not an activity statutorily authorized to be conducted by the Texas state agency that built it.
	dirt.umkc.edu /dd99/Dd031599.htm (632 words)

	* Fish pass - (Fishing): Definition
		A vertical slot fish passage is similar to a pool and weir system except that each "dam" has a narrow slot in it near the channel wall.
		Acidification of southwestern Nova Scotia, poor land use practices, barriers to fish passage, overfishing and competition with others fish species is assumed to have impacted whitefish populations in Nova Scotia...
		These tarpon fish are hurried, and about as likely to stop as...
	en.mimi.hu /fishing/fish_pass.html (142 words)

	BHR Group's services in Fluid Systems
		Termed a multi-use pass, the construction is proposed by the Environment Agency, within the existing channel of the river immediately upstream of Padiham Weir.
		Two models, one at 1:25 and the other at 1:12 scale, were used to study the effect of the bifurcated channel on upstream and downstream river levels.
		They were also used to assess the hydraulic performance of the multi-use pass with respect to the migration of fish upstream, whilst simulating white water conditions suitable for canoeists.
	www.bhrgroup.co.uk /press/prw191001.htm (302 words)

	Toxic fish Please pass this on as usual (Site not responding. Last check: 2007-11-07)
		Please pass this on, and have anyone who you contact, get in touch with me...if they would like their name included my list.
		In the absence of complete information about the levels of methylmercury contamination of fish, we believe that the FDA should warn vulnerable populations not to eat swordfish, shark, and fresh tuna, since they have been previously shown to contain unsafe levels of methylmercury.
		When consumers purchase swordfish, shark, and fresh tuna that is either prepackaged or packaged at a fish counter, the package should bear a label that tells pregnant women, women who might become pregnant, nursing mothers, and young children not to eat it.
	implants.clic.net /tony/Corner4/107.html (880 words)

	UKAEA: Press Releases (Site not responding. Last check: 2007-11-07)
		A fish pass and dam associated with the reservoir developed in the 1950s to support the arrival of nuclear power at Dounreay has been upgraded as part of the site’s new mission to restore the environment.
		He said: "The original dam and fish pass at Loch Shurrery was developed by UKAEA in the 1950s as part of our need for a supply of large quantities of freshwater for the experimental reactor programme that was being built up at the time at Dounreay.
		Care was taken not to disrupt the migration of the fish during the installation period.
	www.ukaea.org.uk /press/2001/15oct2001.htm (581 words)

	EVOS-Restoration-Project Lists-Research Facilities197 (Site not responding. Last check: 2007-11-07)
		This project funded design, construction, and installation of a fish pass at the Alaska SeaLife Center in Seward.
		Without a fish pass, such studies could not be done efficiently and effectively at the SeaLife Center.
		The Trustee Council contribution to the fish pass was for the research components of the structure only.
	www.evostc.state.ak.us /restoration/projects_facilities197.html (99 words)

	Total-Fishing.com
		WORK has started to build a new fish pass in Pembrokeshire at Haverfordwest town weir on the Work Work has started to build a new fish pass in Pembrokeshire at Haverfordwest town weir on the Western Cleddau costing nearly a quarter of a million pounds.
		No longer will the fish have to jump from pool to pool but will be able to ascend easily simply swimming through the pass unimpeded.
		The pass design is known as a "super active bottom baffle" and will allow fish to ascend easily over a wide range of river flows.
	www.total-fishing.com /News.asp?Action=View&ID=8E4E4A17F9EA4C4AAF870EF277872EE0 (466 words)

	Products
		Fabricated in Aluminium or for saline water Grade 316 Stainless Steel.These units may also be fabricated in white polypropylene for use in close proximity to fish counter electrodes.
		A cost effective solution where both river control and fish facilities are required at the same location.
		All enquiries for the Rotary Screw Trap should be emailed to Martin O'Farrell of Fishtrack (mofarrel@indigo.ie) All other enquiries should be made to Dick Roberts on the phone number or email address below.
	www.fishway.freeserve.co.uk /products.htm (660 words)

	Rollover Fish Pass - Nationally Known Fishing Spot (Site not responding. Last check: 2007-11-07)
		As the name implies, it permits fish to swim from the gulf the the bay and vice-versa with the changing tides.
		The pass was constructed in 1956 for the purpose of improving fishing in the bay, and thousands of local and visiting anglers have found it highly succesful.
		Tourist courts and road side stands have sprung up on both sides of the pass to accomodate the many fishing and many beach cabin owners will rent their cabins by day or week.
	www.crystalbeach.com /rollover.htm (300 words)

	More Work Together (Site not responding. Last check: 2007-11-07)
		For years fish migrating to spawn in the upper reaches of the Twrch were faced with two serious obstructions.
		The work which was carried out in consultation with Environment Agency Fisheries staff has involved installing a series of low weirs to work as a fish pass on as part of the new A482 road bridge.
		The total cost of the whole project, including the fish pass was £1.7 million.
	www.carmarthenshire.org.uk /more_work_together.htm (581 words)

	Fish Counter Fishway Fish Pass - IchtyoS System, Dam fish ladder - Counter fish - Fishcounter - Fishcounting Envirotel
		The innovating side of the IchtyoS system is that the data require no post-treatment, which are compiled in a way so they can be used directly by the operator who can view the results simply by touching the screen.
		, but it also allows for a precise counting and classification of the fish, while eliminating specimen manipulation and posing no constraint to their free circulation.
		It eliminates the human factor from the spawning run statistics, reducing the risks of poaching or accidents being the outcome of manipulations or a temporary captivity.
	www.envirotel.ca /ichtyos/fishway.htm (215 words)

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