I research eel, shad, salmonid & lamprey migration in regulated rivers (pump, hydro, weir & res) @UniOfHull Int’l Fisheries Inst (HIFI). Director @LincsRivers🐟
Joined February 2013
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Our new paper with Conte lab comparing #airlift and #siphon #bypasses for #downstream #passage of silver American #eel. 50 days free access too! Thanks @AquaticSciences!!
#fishmigration #fishpassage #hydropower #anguilla #catadromous #PITtelemetry #video
authors.elsevier.com/c/1Y1pC…
Jonathan Bolland retweeted
Delighted to spend yesterday with @EnvAgencyMids & @UniOfHull at #SevernHam tagging #TwaiteShad as part of @SevernUnlocked.
Great to see the tangible benefit the project brings first hand as these beauties make their way upstream to spawn.
ALT Chris & Laura from the EA national and local teams in the Severn waiting for the Shad to come up the weir. They collect them in the net and pass them to the tagging team.
ALT Jamie fro Uni of Hull measuring this Shad so they can assess the growth if it is caught in future years of tagging.
ALT A quick photo op whilst we’re checking this one’s is ready for the next stage of moving the Shad from this anaesthesia to the tagging station.
ALT Chris from the national EA team checking the anaesthesia has worn off and the fish is ready to be released.
Jonathan Bolland retweeted
Faced with barriers to migration, how do animals respond? We found that some sea lamprey stay put downstream of weirs, and others wander substantial distances.
In our new paper we examine the patterns, causes and consequences of this variation
doi.org/10.1111/fwb.13869
Jonathan Bolland retweeted
Interested in a PhD in #REWILDING? We have 6 fully-funded PhD projects available at the REWILD research cluster at the @UniOfHull on #eDNA, public perceptions, environmental impacts etc. with @DrBlakeMorton @aBugBlog @HopkinsChar @BerndHaenfling @bedform ...
Jonathan Bolland retweeted
A project ~5y in development but on site <6h to remove 1.3m high & 9m wide weir and >100y of river fragmentation. Opened ~11km to free #fishpassage & #geomorphology
#WeirTodayGoneTomorrow
#damremovaleurope #UAP
Upper Aire Project
@PeteTurnerEA
wildtrout.org/wttblog/newfie…
On the #WTTBlog our @ProfJGrey walks us through the removal of Newfield Bridge weir on the Aire: wildtrout.org/wttblog/newfie…
Response time of the #trout was impressive!
#fishpassage #geomorphology #LetItFlow #damremoval
ALT Newfield Bridge weir in situ, 1.3m high and 9m wide
ALT Post removal of the weir, the formerly impounded reach upstream has been reinvigorated and a more sinuous course is forming
ALT Looking downstream to the weir (whilst still in situ) over the impounded reach
ALT Post weir removal, the channel has returned to more natural proportions and beginning to restore a more natural gradient
Jonathan Bolland retweeted
Tagged sea lamprey struggling to pass weirs in the Severn during their upstream spawning migration. A typical fate for migratory fish in our fragmented river systems, often occurring out of sight (+out of mind?). Read the full story in our new paper here doi.org/10.1002/aqc.3625
Jonathan Bolland retweeted
Well this is exciting, my very first article has been published! Check it out if you’re interested in tagging effects and how size of smolts influence outmigration estimates. Thank you for a great collaboration @kwvollset @FisheriesRobert @ErlendMHanssen and more.
We consistently find that tagged salmon migrate earlier than untagged (see onlinelibrary.wiley.com/doi/…). @MagnusHulbak figured out why! doi.org/10.1111/fme.12495. Larger fish migrates earlier - so if you have size limit of how small salmon you tag you get a biased outmigration date.
Jonathan Bolland retweeted
Via the NEW Diglis fish pass, twaite shad can now swim past #Worcester on their #SevernShadRun for the first time in nearly 180yrs! 🎉🐟🎉
Please watch & share our video! #FollowTheShad #FishMigration @CanalRiverTrust @severnrivers @EnvAgencyMids @HeritageFundM_E @LIFEprogramme
Jonathan Bolland retweeted
Lovely to see the first run of Twaite shad last week on the Severn. These are a rare freshwater herring which really struggle with barriers to migration.
@SevernUnlocked @severnrivers @ninaconstable @BBCSpringwatch
Jonathan Bolland retweeted
On #MayDay let's celebrate the amazing #MayFish migration!
This year's #SevernShadRun is even more special - shimmering #TwaiteShad can swim past Victorian weirs in Worcester for the 1st time in nearly 180 years!
#FollowTheShad #RiverSevern @severnrivers unlockingthesevern.co.uk/202…
Jonathan Bolland retweeted
I leave @severnrivers in a couple of months, I am asking on those who live, work or play on the Severn to kindly help raise funds for to help this mighty river and its wildlife. Please spread the word
gofund.me/fd6e0865
@IoloWilliams2 @DaveThroupEA @JackPerksPhoto
Jonathan Bolland retweeted
A little video update from the river bank at the end of a very busy first week of the #RiverSevern shad run!
We'd love to hear any of your #ShadSpotting updates over the bank holiday weekend! Don't forget to tag us and use #SevernShadRun 🐟🐟🐟
#FollowTheShad
Jonathan Bolland retweeted
Had a great week tagging twaite shad on the Severn, and am excited to find out where they go and what they get up to across the next three years! #ShadSevern #SevernShadRun
Jonathan Bolland retweeted
Downloading our barbel movement and temperature data, couldn't ask for better weather ☀
Jonathan Bolland retweeted
It's a beautiful day next to the #RiverSevern. @MYeldham and @FishMigrationDr are out placing acoustic receivers along the river ready for the #SevernShadRun #FollowTheShad @CRTWalesandSW @severnrivers @EnvAgency @BU_Research – at Tewkesbury, England
Jonathan Bolland retweeted
Check out this preview clip about @MarineSwansea sea trout acoustic telemetry research with @LizzieDalyWild - BBC1 Wales/IPlayer 9 April at 1935h UTC bbc.co.uk/programmes/p098p9v…
Jonathan Bolland retweeted
Salmon are very capable jumpers & swimmers but they also have major problems passing Annacotty weir. This ornamental weir delays their migration. They can suffer injuries & all waste valuable energy. Many do not make it upstream.
Please sign the petition: my.uplift.ie/petitions/remov…
Jonathan Bolland retweeted
BIG NEWS for river dolphins: scientists show that endangered Indus & Ganges river dolphins are 2 separate species
wwf.panda.org/discover/our_f…
@GillBraulik @univofstandrews @_SMRU_ @NOAA @WWFRiverDolphin @WWFPak @WWFINDIA @WWFLeadWildlife @Stuart_Orr
Jonathan Bolland retweeted
Explore the movement of five fish (incl. barbel) that were tracked with @vemcoteam tags across five years! Data collected across three PhDs; mine, @emmatnolan s and @Pete_Davies1. With @FishMigrationDr and R Britton in collab w. @SevernUnlocked
🐟🎣
unlockingthesevern.co.uk/fis…
Jonathan Bolland retweeted
Freshwater fish move within the river to use different habitats for feeding, breeding and as refuge. @Pete_Davies1 @CatieGR and will be sharing insights on the freshwater journeys of #TwaiteShad, #Barbel & #SeaLamprey Free Talk TMORO Thurs 18th - book now👇unlockingthesevern.co.uk/cal…
Jonathan Bolland retweeted
new paper out today on fishway efficiency. What makes a fishway efficient? More importantly, can we all agree on the best methods to answer that question? #fishsci #fishways #fishpassage onlinelibrary.wiley.com/doi/…