and sea lamprey in the Humber Estuary Claire Argent Marine Lead - - PowerPoint PPT Presentation

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Mar 07, 2024 360 likes •551 views

Our current understanding of river and sea lamprey in the Humber Estuary Claire Argent Marine Lead Adviser, Yorkshire & northern Lincolnshire www.gov.uk/natural-england What will be covered River and sea lamprey status: Current

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www.gov.uk/natural-england

Our current understanding of river and sea lamprey in the Humber Estuary

Claire Argent

Marine Lead Adviser, Yorkshire & northern Lincolnshire

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What will be covered

River and sea lamprey status:
Current understanding in the Humber
Issues affecting lamprey
Previous and current projects
Future work

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Humber lamprey populations

River and sea lamprey
SAC (Humber & Derwent)
SSSI (Humber & Derwent)
Ramsar (Humber)
Anadromous species
~7 year lifecycle

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Humber Estuary: Sea Lamprey

What we know….

Humber population
Estimate ~200
Feature condition in the Humber
2010: Unfavourable recovering

(at risk)

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Dissolved Oxygen (DO) sag
24,000ha Unfavourable SSSI units
#1 priority Humber IPENS SIP
Does the DO sag impact sea lamprey migration?
EA DO monitoring (2015-18)
NE sea lamprey tagging (2015, 2017)
EA spawning surveys (2011-16)

Sea lamprey status

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Sea lamprey tagging project

(Bubb, 2015)

20 Apollo II traps
March to July 2015
3 locations

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Project Outcomes: sea lamprey tagging 2015

45 sea lamprey captured and tagged
None recorded at spawning grounds
673 river lamprey

(Bubb, 2015)

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Project Outcomes: DO monitoring 2015

2 4 6 8 10 12 0.02 0.04 0.06 0.08 0.1 0.12 DO (mg/l) Sea Lamprey CPUE CPUE Blacktoft Boothferry Selby

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Future Projects

No tagging survey in 2016
Extended tagging project in 2017
Collaboration with Cefas in 2017
DO monitoring will continue in 2017
Spawning survey 2017

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Humber Estuary: River Lamprey

What we know….

Humber population
Widely used estimate ~300,000

(Masters et al 2004)

Feature condition in the Humber
Unfavourable recovering

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Impacts include
Barriers
Hydropower
Water quality
Commercial fishery

Gardiner, R (2003)

River lamprey impacts

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Current Issues

Current Key Questions….
Is the river lamprey commercial fishery sustainable?
What are the impacts of low head hydropower

schemes on rivers?

What are the impacts of barriers including weirs and

unsuitable fish passes?

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Current and future work

Ongoing discussions between NE, EA, local

experts

New methodology for commercial fishery
Trial for 2016 season
Working with netsmen
CPUE data

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Current and future work

Addressing barrier impacts
Fish pass improvement work
Addressing potential impacts from low-head

hydropower schemes

Durham University
Cefas studies

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Future projects

NE Lamprey mapping project 2016/2017
Full literature review
Spawning/ammocoete surveys
Mapping key areas
Lamprey strategy

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Positive outcomes

 Starting to know more about the Humber river and sea lamprey than ever before  Working towards improving the status of 24,000ha unfavourable Humber SSSI units and #1 priority of the Humber IPENS SIP  Partnership working to raise awareness and profile

f the species

(HNP, 2015)

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Thank you for listening!

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DO targets

Targets for DO:
DO should not fall below 2mg/l
DO should not fall below 5mg/l for more than 5

consecutive days

Following a period of DO of less than 5mg/l there

should be at least 2 consecutive days where DO remains above 5mg/l

(source: Hopkins, 2007)