Jonathan Bolland

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/1Y1pC3IW-wXz…

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.

@BarbieriSue Something I’ve wanted to get to grips with for quite sometime… spatial and temporal variability in sync tag detection rate, position rate and positioning error in VPS arrays. Got a few data sets to play with too

Sync tag detections in our vps array vary with receiver. We looked at # of sync tag detections divided by expected detections (receivers in range * ping rate). Large differences with receiver, no habitat obstruction and not due to tagged fish collections. Anyone else have this?

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.13…

@Calvia14 @UniOfHull @DrBlakeMorton @aBugBlog @HopkinsChar @BerndHaenfling @bedform Anyone want to do a PhD on Effective biodiversity monitoring of river rewilding projects using eDNA modelling with me and others @UniOfHull?? Check out advert 5 in this cluster

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 ...

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…

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.36…

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.

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

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

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/2021/04/20/the…

@racheldavies110 @MYeldham @Pete_Davies1 @AndyDNunn @IslanderDodd @charlescrundwe1 74. Monumental effort from all involved!!

@MYeldham @Pete_Davies1 @FishMigrationDr @AndyDNunn @IslanderDodd @charlescrundwe1 What was the total number tagged?

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

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

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

Downloading our barbel movement and temperature data, couldn't ask for better weather ☀

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

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/p09…

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/remo…

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