Notes for use of this data.  

These data represent a snapshot of the fish distribution along a river at the time of survey. Surveys capitalise on the natural distribution of fish during the hours of darkness.

Fish density.

The value shown for fish density represents the number of fish per 1000 m³ of water sampled. The colour of the circle denotes the fish density as described in the map legend. The volume of water sampled by the acoustic beam broadly depends on the channel profile and boat speed If the total volume sampled is less than 1000 m³ then the calculated fish density does not represent the actual fish density. Consequently within the data set a value of 0.0 would indicate insufficient sample volume.  Conversely a fish density value of 0.1 or higher indicates that sample volume is sufficient. In most cases insufficient sample volume is a consequence of channel width, depth and / or extensive weed growth.  

Fish size research shows that the strength of a return echo relates to the size of the object producing the return.
The equipment used during surveys is capable of recording return echoes from objects less than 3 mm in size. Objects providing return echoes of this size could include reed stems, weed fronds, fish fry and suspended debris. To avoid erroneous fish counts and density value, return echoes are filtered during post processing. Fish density value reflects this filtering and the return echo strength chosen ensures that the minimum theoretical fish size counted is 100 mm.

Click the ‘download attachment’ link below to download this report as a PDF 

Jeff Compton Bsc Msc

Environment Monitoring officer (A&R) Fish

East Anglia
Environment Agency,
Dragonfly House, 2 Gilders Way, Norwich, NR3 1JB

Please find attached the 2017 Great Ouse Relief Channel hydro acoustic map for circulation.

Click the ‘download attachment’ link below to download this report as a PDF

Justin Mould

Fisheries Officer - A&R

Cambridgeshire and Bedfordshire Area

Environment Agency, Bromholme Lane, Brampton, Huntingdon, Cambs, PE2 84NE

External Telephone: 02030251870

justin.mould@environment-agency.gov.uk

Please find attached the 2017 Survey report for the Counter Drain Mepal to Salters Lode, produced by Justin Mould and team Brampton. 

Click the ‘download attachment’ link below to download this report as a PDF

Justin Mould

Fisheries Officer - A&R

East Anglia Area (Cambridgeshire & Bedfordshire and Essex, Norfolk & Suffolk)

Environment Agency, Bromholme Lane, Brampton, Huntingdon, Cambs, PE2 84NE

External Telephone: 02030251870, Internal Telephone: 51870

justin.mould@environment-agency.gov.uk

This report provides a summary of results from recent fish population surveys on the River Chelmer between Great Dunmow and Chelmsford. The surveys were carried out to assess the health of the river and enable successful management of our principal fisheries.

Click the ‘download attachment’ link below to download this report as a PDF

Jon Diss

Environmental Monitoring Officer (Analysis & Reporting)

Environment Agency

Kelvedon Office

Rivers House

Threshelfords Business Park

Inworth Road

Kelvedon

CO5 9SE

( Int. 46006

(Ext. 0208 474 6006

This report provides a summary of results from recent fish population surveys on the River Gipping between Stowmarket and Ipswich. The surveys were carried out to assess the health of the river and enable successful management of our principal fisheries.

Click the ‘download attachment’ link below to download this report as a PDF

Jon Diss

Environmental Monitoring Officer (Analysis & Reporting)

Environment Agency

Kelvedon Office

Rivers House

Threshelfords Business Park

Inworth Road

Kelvedon

CO5 9SE

( Int. 46006

(Ext. 0208 474 6006

This report provides a summary of results from recent fish population surveys on the River Stour between Sudbury and Higham. The surveys were carried out to assess the health of the river and enable successful management of our principal fisheries

Click the ‘download attachment’ link below to download this report as a PDF

Jon Diss

Environmental Monitoring Officer (Analysis & Reporting)

Environment Agency

Kelvedon Office

Rivers House

Threshelfords Business Park

Inworth Road

Kelvedon

CO5 9SE

( Int. 46006

(Ext. 0208 474 6006

This report provides a summary of the 2015 fish survey results in the lower River Stour and an insight to the current fish population status of the river

Click the ‘download attachment’ link below to download this report as a PDF

Jon Diss

Environmental Monitoring Officer (Analysis & Reporting)

Environment Agency

Kelvedon Office

Rivers House

Threshelfords Business Park

Inworth Road

Kelvedon

CO5 9SE

( Int. 46006

(Ext. 0208 474 6006

This report provides a summary of results from recent fish population surveys on the Chelmer & Blackwater Navigation between Chelmsford and Langford. The surveys were carried out to assess the health of the river and enable successful management of our principal fisheries.  

Click the ‘download attachment’ link below to download this report as a PDF

Jon Diss

Environmental Monitoring Officer (Analysis & Reporting)

Environment Agency

Kelvedon Office

Rivers House

Threshelfords Business Park

Inworth Road

Kelvedon

CO5 9SE

( Int. 46006

(Ext. 0208 474 6006

 This report provides a summary of the 2015 fish survey results in the River Stour (Upper) and an insight to the current fish population status of the river.

 Click the ‘download attachment’ link below to download this report as a PDF

Jon Diss

Environmental Monitoring Officer (Analysis & Reporting)

Environment Agency

Kelvedon Office

Rivers House

Threshelfords Business Park

Inworth Road

Kelvedon

CO5 9SE

( Int. 46006

(Ext. 0208 474 6006

This report provides a summary of the 2014 fish survey results in the River Colne and an insight to the current fish population status of the river.

Click the ‘download attachment’ link below to download this report as a PDF

Jon Diss

Environmental Monitoring Officer (Analysis & Reporting)

Environment Agency

Kelvedon Office

Rivers House

Threshelfords Business Park

Inworth Road

Kelvedon

CO5 9SE

( Int. 46006

(Ext. 0208 474 6006