PDF Archive search engine
Last database update: 17 May at 11:24 - Around 76000 files indexed.

Show results per page

Results for «fishes»:

Total: 1000 results - 0.025 seconds

2017 SHGFC Classic 98%



083934 Scan0002 98%



Winter Newsletter 2014 98%

Upcoming Events: 2014 Is Here!


WRCResearchNews8.5 96%

    Biologists Investigate Novel Way to Repopulate Brook  Trout Native to the Southern Appalachian Mountains      Each of these hatcheries have different water sources:  the Tennessee Aquarium Conservation Institute uses  recirculating water in their systems; the Tellico Trout  Hatchery uses stream water; and the Erwin Trout  Hatchery is spring­fed. As part of these efforts, fisheries  biologist Brad Cook and his team, including graduate  student T.J. Johnson, were called in to collect data on  which of these methods is the best.       (Cookeville, Tenn.)  The Tennessee Wildlife Resources  Agency (TWRA)  and the U.S. Forest Service are  interested in protecting a species of fish that, while not  endangered, is declining in numbers.  The brook trout  Salvelinus fontinalis​  is the only species native to the  southern Appalachian Mountains, and—thanks to  encroachment from other fish, acid deposition and  dropping pH levels—are now restricted to extreme  headwaters.     While techniques like electrofishing and angling have  been used to remove rainbow trout Oncorhynchs  mykiss, the fish that are competing for the brook trout’s  habitat, methods of restocking are helping supplement  those efforts and repopulate the brook trout in their  home.   One method of restocking involves  translocation, or moving fish from other areas to the  new stream.  But, genetically, that might not be the best  way.  The use of hatcheries to raise brook trout  populations seems to be the most effective way of  restocking.     In 1992, TWRA began raising southern Appalachian  brook trout at Tellico Trout Hatchery.  The Tennessee  Aquarium Conservation Institute, the Tellico Trout  Hatchery, and the Erwin Trout Hatchery are now raising  brook trout for this research project.  The research team collects brood fish each fall from  Sycamore Creek and from Left Pring Hampton Creek.  About 50 male and female adult fish, ranging from five  to ten inches long, are taken to the Tennessee  Aquarium Conservation Institute and the Tellico Trout  Hatchery where the researchers take milt from males  and eggs from females and then place the fertilized  eggs in incubation jars until they hatch.     “The colder the water temperature, the longer it takes  for hatching,” Cook said.     According to Johnson’s data, the spawnings in 2013  were the most productive at the Aquarium Hatchery,  with approximately 53% of the eggs surviving from the  eyed egg stage to the fingerling stage, in which the fish  can be transported back to the river.               “The fingerlings are packed in thick plastic bags and  transported by horse to the streams in September,”  Johnson said.  “There they are evenly distributed along  the streams.  If they live until March and survive the  winter, we consider the fish as having recruited to the  population.”    The researchers mark the fish with pliable plastic tags  to distinguish which hatchery they originated from.  They are careful to restock fish back into the stream  from which they originated, i.e., Left Prong Hampton  Creek fish back into Left Prong Hampton Creek and the  Sycamore Creek fish back into Sycamore.  The  researchers revisit the sites 30, 90 and 180 days after  stocking.     While mortality of stocked fish is possible through  predation and prolonged cold temperatures,  researchers are not sure to what extent this occurs  because flood events can also push them down stream,  in which case they may not be dead. Researchers know  that angling is not a major threat to brook trout because  their size and the difficulty in reaching their habitat  keeps them from being as desirable a catch as other  fishes to most anglers.    “This helps tell us that hatchery propagation and  stocking methods are suitable techniques to establish  these populations of fish,” Cook said.  “Eventually, we  hope that we won’t have to stock them, but we’re going  to gather another years’ worth of data before the project  will be complete.  “We’re finding that Sycamore Creek is in need of  restoration, but it’s becoming a good population of  brook trout whereas Left Prong Hampton Creek is  already a good population.     “This project is teaching us a lot about the brook trout’s  habitat and survival needs,” Cook said.  He and Johnson want to publish their work to make  future restocking and restoration efforts more effective.  Johnson has already presented his data at state  meetings.  He plans to graduate with a master’s degree  through the project in May 2016.             Follow our social media to stay current on all things  WRC:                 @TnTechWaterCenter  ​    ​


Recharte et al 2008 95%

The fishes and the forest, Explorations in Amazonian Natural History.


MIR - restricted investments 95%

For reference purposes only NOTICE:



ANABANTIDS (LABYRINTH FISHES) - GOURAMI / BETTA FIGHTING FISH M Koi Siamese Fighting Fish ‘Betta splendens’ £14.99 e M Plakat Fancy Male Siamese Fighting Fish ‘Betta splendens’ £14.99 e M Assorted Female Siamese Fighting Fish ‘Betta splendens’ £3.99 e L Assorted Male Siamese Fighting Fish ‘Betta splendens’ £6.99 e ML Gold Gourami 'Trichopodus trichopterus' £5.99 e 3 for £15.00 ML Pearl Gourami 'Trichopodus leerii' £5.99 e 3 for £15.00 M Red Robin Gourami 'Trichogaster chuna' £3.99 e 4 for £15.00 M Yellow Honey Gourami 'Trichogaster chuna' £3.99 e 4 for £15.00 M Wild Type Honey Gourami 'Trichogaster chuna' £2.99 e 4 for £10.00 MELANOTAENIIDAE (RAINBOW FISH) ML Striped Dwarf Rainbowfish ‘Melanotaenia maccullochi’ £6.99 e 3 for £18.00 M Banded Rainbow 'Melanotaenia trifasciata’ £3.99 e 4 for £15.00 M Boesemani Rainbowfish 'Melanotaenia boesemani' £6.99 e 3 for £18.00 SLIGHTLY MORE UNUSUAL SPECIES POECILIIDS - LIVEBEARERS L Assorted Guppy Male ‘Poecilia reticulata’ £2.49 e 5 for £10.00 L Assorted Guppy Female ‘Poecilia reticulata’ £2.49 e 5 for £10.00 M Endler Guppy 'Poecilia wingei' £3.49 e 3 for £9.00 L Dalmation Molly 'Poecilia latipinna' £2.99 e 4 for £10.00 L Gold Leopard Molly 'Poecilia latipinna' £2.99 e 4 for £10.00 L Silver Molly 'Poecilia latipinna' £2.99 e 4 for £10.00 ML Assorted Platy 'Xiphophorus maculatus' NEW TANKS BEING INSTALLED IN FISH HOUSE ML Assorted Swordtail 'Xiphophorus hellerii' NEW TANKS BEING INSTALLED IN FISH HOUSE INVERTEBRATES L Amano Shrimp 'Caridina multidentata' £2.99 e 4 for £10.00 POPULAR SHRIMP TO HELP WITH ALGAE XL Armoured Shrimp 'Atya gabonensis' £24.99 e 2 for £45.00 VERY LARGE SHRIMPS FROM GABOON M Cobalt Blue Lobster 'Cherax quadricarinatus' £14.99 e 2 for £28.00 NICE BLUE COLOUR - GROWS LARGE!!


ar hrs188 2015 94%

Endemic fishes are often the most abundant in their genera or families presumably because they have had ample opportunity to become fully adapted to the local environment.


WHI AQ Background Paper 2015 94%

Endemic fishes are often the most abundant in their genera or families presumably because they have had ample opportunity to become fully adapted to the local environment.