Fish-Tales (English)

'Onder water in Leiden' translates as Under water in Leiden.

  • Under water in Leiden is a unique project for the Netherlands, started by locals in 2011. They became interested in the life under the surface after the city-canals got cleaner and clearer.
  • This clarity (and growing abundance in wildlife) was mainly due to well-planned maintenance of the waterways within the city and surrounding areas.
  • The project 'Monitoring of Fish', encompasses the checking and counting of wildlife in the canals and is since 2013 an official biodiversity project.

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onderwaterinleiden monitoring onderwater zeelten
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Support from local and nationwide institutions

  • Under water in Leiden is supported by the Leiden council, various institutions who work with and on the waterways and of course widely appreciated and cared for by the locals.
  • Almost 50% of the monitoring is done snorkelling in the canals, with a special permit, since swimming in te canals in Leiden is otherwise prohibited.
  • Do you wish to join Diving Club Calypso in a snorkelling trip and monitor the fish with the specialists? Send an e-mail to Calypso. Please note: You must be a well-abled snorkeller or diver! There is a disclaimerpage.

Main goals of our project:

  • Two neighbours spotting a pike

    To get a better insight in the abundance of all species of flora and fauna that inhabit the waters of Leiden (30 mins from Amsterdam).
  • Special interest is in how exactly the animals use the canals (for breeding, feeding etc). And we try and uncover what measures are necessary to keep them (or invite even more of them) here.
  • Another goal is to get the people of Leiden involved in taking care of their environment 'in front of their door'.
  • They can do that by taking out debris with small fishing nets, or by helping with the big cleanup-jobs we organize with i.e. the diveteam from the fire-department and the council.
  • But also by spotting, counting and registering the fish they see, 'protecting their pike' (each canal has its own individual, territorial pike!) and so forth.

Does this inspire other cities?

  • Aaf's independent bureau of advisory work on aquatic species in the canalsAs projectleader of the succesful fishmonitoring group in the Havenwijk, Ms Aaf Verkade has been asked by the council to extend her activities to new communities in Leiden in 2016 and 2017
  • If possible, we would like our project to be copied by enthousiastic locals in other cities as well! It worked very well with our 'Feline Lifeline' programme, see below.
  • Aaf enjoys stimulating the locals to clean up the waterways in their communities and care for their 'neigbours under water' - you can hire her to give an inspirational speech (in 5 languages)!
  • See her professionalwebsite stadsgrachten.nl for more information about her work as an independent City Canal advisor (in Dutch only).

Flashlightfishing, just one of 10 methods we use to count fish

Flashlightfishing, just one of 10 methods we use to count fish

Their first American crayfish! (exotic species, though)

Their first American crayfish! (exotic species, though)

Would you believe this photo was taken in a canal?

Would you believe this photo was taken in a canal?

Our canals are full of (young) fish; at least 19 species!

Our canals are full of (young) fish; at least 19 species!

Handpicked media are invited to interview our team

Handpicked media are invited to interview our team

Missisippi slider turtles, at home in Leiden too

Missisippi slider turtles, at home in Leiden too

A bullhead (rivierdonderpad) saved by Nick

A bullhead (rivierdonderpad) saved by Nick

Trashurehunting in the canals, with unbelievable finds!

Trashurehunting in the canals, with unbelievable finds!

Protected species and amazing discoveries

  • The exotic tubenosed goby, now also found in LeidenThe protected species found until now are: eel, spined loach and bullhead.
  • Exotic species, like Chinese lobsters and American crabs have also been discovered, as well as Mississippi slider turtles, which are seen abundantly and counted for research.
  • An exotic goby was discovered in 2015 (the tube-nosed goby) and its invasion of the Leiden canals is being investigated with a 'goby-grant': Aaf won a special grant from Stichting RAVON.
  • Aaf also discovered a 'flat fish' in the research area Havenwijk-Zuid in 2015, called the flounder, which is a species that uses both salt and sweet water to live go through all of its life-cycles.

Facebook of big fish

  • Indeed, big fish have (just like dolphins and whales) nicks, scratches and parts of fins missing, which makes them individually distiguishable. They are catalogued in their own 'Facebook' (Smoelenboek) on this website.

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onderwaterinleiden smoelenboek rivierdonderpad
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onderwaterinleiden smoelenboek zeelt-
Naamloos-WareKleuren-
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Cleaning up the clutter under water

  • The bikes and other debris on the bottom are regularly taken out of te water with help of the fire department, locals, other volunteers and the council. Click here for a link.

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onderwaterinleiden winnaar-fotowedstrijd floorhendriks groot
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onderwaterinleiden grofvuilvissen fiets
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Cleaning up the (floating) debris

  • We started a Taskforce with the council, a tourboat company (Stichting de Leidse Rederij), a back-to-work rehab programme and locals  with the main goal to regularly clean up the plastic garbage floating in the city. This works a treat! Click here for the Dutch page.

The KNNV dept. of Leiden and surrounding areas, click to visit their websiteProject of the KNNV, Leiden dept.

  • Since january 2013, the project 'Monitoring of fish in Havenwijk-Zuid' is one of many projects overseen by the KNNV, Leiden dept.
  • This organization of inspired and enthousiastic (amateur) biologists make sure all data is gathered professionally and processed in such a way, that institutions like the council, Angler's Union Leiden and Water-control department (Hoogheemraadschap van Rijnland) can use the data to adjust their strategies and plans regarding water-treatment and fishing-regulations, if necessary. 

Feline Lifelines

  • Feline Lifelines is a hugely successful 'save your cat from drowning in the canals' programme.
  • It was started by the locals, with support from the council, in 2009 in the same neighbourhood.
  • More information (in English) can be found here.
  • Because of its immense success in Leiden (more than 70 cats saved from drowning) it has expanded to at least 20 more cities in the Netherlands!

onderwaterinleiden reddingsnestje meerkoetenfamilie
onderwaterinleiden aaf kattenklimtouw-inspectie
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onderwaterinleiden katuitdegracht reddingsnestje
onderwaterinleiden katuitdegracht kattenklimtouwen meerkoetjes
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Twitter @owinleiden

owinleiden Bijzondere 'kat in boom' in de @HortusLeiden - en ook 'kat uit de boom kijken!' https://t.co/h8BEJYG5XH
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owinleiden RT @WaterpanelNoord: Ongeveer 50 % van de straatputten is niet meer aangesloten op de zuiveringsinstallatie maar op een buffer of een beek.…
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Contact

"Onder water in Leiden" is onderdeel van "Aaf Verkade Adviseur Stadsgrachten"

Kijfgracht 12
2312 RZ Leiden
info@onderwaterinleiden.nl

KvK 64674487
BTW nummer NL163735694B01

Disclaimer - Algemene voorwaarden

Kleurplaat

onderwaterinleiden kleurplaat 1mb

Illustrator: Lisa Poot