Thames Anglers' Conservancy Members Forum
TAC Members-Only Forum
If you have arrived here and not yet signed up as a member, then please first join at http://forum.rivertac.org/register using your real name.

Forum Membership is with Real Names only.
Please create a Username that is your First Name and Surname eg. "Joe Bloggs"
(This will save our Admin team the need to contact you about changing it)

http://rivertac.org/membership


Thames Anglers' Conservancy Members Forum
 
HomeHome  TAC Home PageTAC Home Page  SearchSearch  FAQFAQ  RegisterRegister  Log in  
Navigation
Search
 
 

Display results as :
 
Rechercher Advanced Search
Latest topics
» Thames TideFest 10th September 2017
Sun Aug 20, 2017 11:51 pm by David Harvey

» Eel Trap Results 2017
Sun Aug 20, 2017 11:47 pm by David Harvey

» Do you recognise any of these men?
Sat Aug 19, 2017 8:44 pm by Ed Randall

» Roads closed everywhere ~ July 29th/30th ~ bike race
Wed Jul 26, 2017 9:17 am by Ed Randall

» Better access to free Thames fishing in Reading
Fri Jun 16, 2017 10:08 am by Ed Randall

» Eel screens on Water Works intakes
Tue May 23, 2017 10:26 pm by Julian Jones

» River Thames Conditions - Quick Dial Numbers
Sun May 21, 2017 10:00 am by Ed Randall

» Ap[ril showers? If only! Drought beckons...
Thu May 04, 2017 6:56 pm by Ed Randall

» Abbey river this Saturday (12/5/2012)
Thu Apr 27, 2017 4:41 pm by Ed Randall

» Molesey Eel Monitoring Training ~ 29th April 2017
Mon Apr 24, 2017 11:12 am by David Harvey

» Thames Water fined a record £20m for River Thames pollution
Fri Mar 24, 2017 1:54 pm by Stephen Bond

» Crane Riverfly Training ~ May 6th 2017
Thu Mar 16, 2017 9:08 am by Ed Randall

» TAC visit to Tideway Tunnel Exhibition in Parliament
Wed Mar 15, 2017 7:32 am by John LeSurf

» "Citizen Crane" project - sampling dates
Thu Mar 02, 2017 4:24 pm by Ed Randall

» Egham & Stains bankside enhancement followed by brewery trip
Sun Feb 19, 2017 6:27 pm by Ed Randall

» SE Rivers Trust needs help on Hogsmill
Tue Feb 14, 2017 2:23 pm by Ed Randall

» Crane volunteering opportunities
Fri Jan 27, 2017 5:38 pm by Ed Randall

» Seal (with enormous fish) in Thames near Richmond Lock
Wed Jan 25, 2017 8:34 am by Ed Randall

» [Petition] to eradicate size and catch limits for pike to be taken and culled
Wed Jan 25, 2017 8:27 am by Ed Randall

» *Thames Tunnel (Tideway Tunnel)*
Tue Jan 24, 2017 9:42 pm by Ed Randall

» reels for sale
Thu Jan 12, 2017 9:51 am by JeffHowe

» A new address for 2017 ~ forum.rivertac.org
Sun Jan 01, 2017 11:06 am by Admin

» New users - Registration issues
Thu Dec 29, 2016 11:47 am by Ed Randall

» Shepperton river death - Van removed near Dockett Eddy Lane
Thu Dec 22, 2016 9:54 am by Ed Randall

» EA Pollution incidents: 2015 evidence summary
Mon Nov 21, 2016 5:04 am by David Harvey

» Ham & Petersham cleanup Saturday 19th Nov
Sat Nov 12, 2016 6:01 pm by Ed Randall

» LIVE THAMES TEMPS AND CLARITY - TAC exclusive!
Thu Nov 10, 2016 9:51 pm by Stephen Bond

» Citizen Crane Forum at ZSL - Mon 14th Nov 2016
Thu Nov 10, 2016 8:36 am by Ed Randall

» fishing trolleys
Sun Oct 30, 2016 11:23 am by Harry Notley

» Draw off 2016
Sat Oct 29, 2016 2:24 pm by Ed Randall

Angling Data View
River Levels
UK Map

Thames Tides

Share | 
 

 Spawning Rafts

View previous topic View next topic Go down 
AuthorMessage
CassEdwards

avatar

Male Posts : 220
Join date : 2010-01-21
Location : SW London

PostSubject: Spawning Rafts   Sat Mar 06, 2010 12:22 pm

.


Last edited by CassEdwards on Thu Mar 17, 2011 7:42 pm; edited 1 time in total
Back to top Go down
CassEdwards

avatar

Male Posts : 220
Join date : 2010-01-21
Location : SW London

PostSubject: Re: Spawning Rafts   Sat Mar 06, 2010 12:52 pm

.


Last edited by CassEdwards on Thu Mar 17, 2011 7:42 pm; edited 1 time in total
Back to top Go down
Chris Daphne
Committee
Committee
avatar

Male Posts : 141
Join date : 2010-01-28
Location : Highlands of Scotland

PostSubject: Re: Spawning Rafts   Sat Mar 06, 2010 5:37 pm

Just a quick question

What species are the spawning mats/boards aimed at?
Back to top Go down
Chris Daphne
Committee
Committee
avatar

Male Posts : 141
Join date : 2010-01-28
Location : Highlands of Scotland

PostSubject: Re: Spawning Rafts   Sat Mar 06, 2010 5:56 pm

Here's a useful link for habitat improvements in general. To start with.
http://www.therrc.co.uk/
Back to top Go down
Chris Daphne
Committee
Committee
avatar

Male Posts : 141
Join date : 2010-01-28
Location : Highlands of Scotland

PostSubject: Re: Spawning Rafts   Sat Mar 06, 2010 6:53 pm

Species such as Roach will spawn on Fontinalis moss on vertical pilings, Elodea beds, Willow roots, they prefer a flow of >20cm/s. Bream may spawn on stones in lakes but in rivers prefers areas with very little flow and a macrophyte substrate. Tench, Rudd and Carp lay eggs on submerged plants only and a great variety can be used.
Recruitment in any population depends on the suitability of spawning substrate. Most Cyprinids are known to migrate considerable distances during the spawning season and it is vital that any major obstacles do not hinder the migration.

It is also important to note that suitable habitat is available for the subsequent progeny of any spawning fish. For example Roach fry hatch after 12-12 days at 12.9 degrees C, are 4.6 - 6.5 mm long. For the first few days will remain attached to vegetation. The ideal habitat for fry is 1.5m depth with 0.5 - 1cm sandy/silt and gravel substrate. At 8-13mm shoaling occurrs, sensitivity to current decreases and a habitat of woody debris and vegetation is preferred.

Bream hatch at an average of 7-8 days at a temp of 18 degrees C, are 4-6mm. They have a gland on the head attched to vegetation. They are free swimming when yolk sac is absorbed. Heavy predation by invertebrates and fish up to this stage.

Improvements to Spawning Habitat

Natural materials like tree branches or bundles of willow fronds are ideal, man made inert items can also be utilised, polythen/plastic materials such as mesh, nylon fibrous mats and vegetable bags have all been used succesfully. These artificial substrates can be submerged or floating depending on the target species. Aquatic marshland vegetation that grows on artificial or natural floating material may provide spawning substrate. These surfaces are especially succesful when natural surfaces are absent. - Cyprinids.

Shallow bays planted with reeds can be constructed alongside existing channels, these act as a refuge in strong flows for fry as well as creating a spawning area. A floating spaning habitat can be formed by planks with floats and a plastic mesh floor covered with vegetation. Dimension 2m square.
Another alternative can be formed by dry vegetation or cut branches tied between light poles and mounted on the stream/pond/river bed - 2mx3m.
A bankside spawning habitat can also be formed by light pole and wire fence filled with vegetation and cut branches - 2mx3m.


I will post more info as i find it, hope this helps
Back to top Go down
Chris Daphne
Committee
Committee
avatar

Male Posts : 141
Join date : 2010-01-28
Location : Highlands of Scotland

PostSubject: Re: Spawning Rafts   Sat Mar 06, 2010 7:06 pm

Artificial Reefs and Overhangs

Reefs are suitable for enhancing lakes and slow areas that lack underwater features. They create sanctuaries of cover and shelter, spawning sites and areas of improved fish food production. Brushwood reefs can be made by tying bushes together and weighting them so they sink. Old tyres can also be used and are readily available, they will not contaminate the water. Each tyre will require several 2cm holes drilled in the upper tread to allow air to escape and sufficient bricks wedged on the lower side to sink it. It is suggested that artificial reefs occupy no more that 0.5% of the total area of the lake and that they be split into several seperate units. Their position must be clearly marked and accurately recorded so to avoid any conflicts, By attaching them together a variety of structures can be built, stacked multiple tyres forming pyramids or double units/triple units. Eventually macrophyte growth will provide lots of habitat for not only fish but invertebrates etc.

Artificial overhangs can be used to protect the banks of lakes and slow flowing rivers whilst producing additional cover for fish. They are designed to provide the same function as overhanging banks, hedges or bankside vegetation. The device consists of platforms constructed above the water surface and held in position by piles driven into the river bed, floating overhanging platforms are an alternative solution.
Back to top Go down
Chris Daphne
Committee
Committee
avatar

Male Posts : 141
Join date : 2010-01-28
Location : Highlands of Scotland

PostSubject: Re: Spawning Rafts   Sat Mar 06, 2010 7:30 pm

This is really related to Aquaculture of Carp but might give you some ideas...

There are a variety of substrates used in Carp farming, mats made up of fibres are used in asia, Half to one metre long fibres made of indjuk ( Arenga spp.) are arranged to form a 40 -70cm mat, pressed longitudinally between two bamboo lathes. They are placed on bamboo poles held in place between two pairs of shorter poles driven into the bottom. The mat remains slightly submerged but floats with the bamboo pole and adjusts itself to changes in water level. Native water weeds kept in place within a bamboo frame are also used. Israeli farmers use branches of Pine.
Artificial spawning mats made of synthetic material can be used. The mat area needed for a substrate is about 10m square for every 2-3 Kg of females. Spawning mats are easy to handle.

Don't know if this is of use but i am sure all these ideas can be modified to suit.
Back to top Go down
CassEdwards

avatar

Male Posts : 220
Join date : 2010-01-21
Location : SW London

PostSubject: Re: Spawning Rafts   Sun Mar 07, 2010 11:08 am

.


Last edited by CassEdwards on Thu Mar 17, 2011 7:42 pm; edited 1 time in total
Back to top Go down
CassEdwards

avatar

Male Posts : 220
Join date : 2010-01-21
Location : SW London

PostSubject: Re: Spawning Rafts   Tue Mar 09, 2010 6:06 pm

.


Last edited by CassEdwards on Thu Mar 17, 2011 7:42 pm; edited 1 time in total
Back to top Go down
James Page



Posts : 2153
Join date : 2010-01-21

PostSubject: Re: Spawning Rafts   Tue Mar 09, 2010 7:10 pm

what the hickety heck chris, do you know youre onions or what, nice one cass, lets hope the manager is ameniable, top posts fellas
Back to top Go down
James Page



Posts : 2153
Join date : 2010-01-21

PostSubject: Re: Spawning Rafts   Tue Apr 20, 2010 8:04 am

have we any updates chaps, I know we have got the surrey butterfly club in there, concerning new habitat creation
Back to top Go down
Sponsored content




PostSubject: Re: Spawning Rafts   

Back to top Go down
 
Spawning Rafts
View previous topic View next topic Back to top 
Page 1 of 1
 Similar topics
-
» Signs of spawning?
» Are Pike still spawning in Scotland?????
» Pike Spawning
» Float tubing allowed at Lake Elsinore?
» Pike Spawning

Permissions in this forum:You cannot reply to topics in this forum
Thames Anglers' Conservancy Members Forum :: Open Section :: Conservation Issues-
Jump to: