Slipper Limpet Management and Utilisation - Fal Case Study
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1 Slipper Limpet Management and Utilisation - Fal Case Study Andy FitzGerald FITZGERALD, A. (2007). SLIPPER LIMPET UTILISATION AND MANAGEMENT. PORT OF TRURO OYSTER MANAGEMENT GROUP
2 Slipper Limpet Impact - Ecosystem Habitat transformer Ultimate loss of biodiversity (inc. native oyster and maerl both protected in UK BAP) Blanchard, M. and Hamon D 2006 Bilan du suivi de l exploitation industrielle de la crepidule en Bretagne Nord (baies de Saint Brieuc et du Mon Saint-Michel), IFREMER report DYNECO/EB/06-01
3 Slipper Limpet Impact - Fisheries Competition for food and space Increased sorting time Handling difficulties Movement restrictions Implications for escape response and compromised survival? Slipper limpet biogenic reef -Salcombe Estuary Photo: Nigel Mortimer Slipper limpet infestation of scallops -Salcombe Estuary Photo: Kevin Oakman
4 Slipper Limpet A Successful Invader How can it out-compete broadcast spawners? Disadvantages Slow initial establishment (need to establish chains ) A chain of slipper limpets Advantages Reproduction more efficient More spawnings/yr Effective feeding strategy Few predators Wide environmental tolerance Effective dispersal
5 Slipper Limpet Historical Catch Rate First arrived in Fal / Helford after WWII at time of major spread though to be associated with the movement and breaking of ships. Cole, H.A The American slipper limpet (Crepidula fornicata L.) on Cornish oyster beds. Ministry of Agriculture Fisheries and Food. Fisheries Investigation Series 2 17 (7), Chains/haul 1970 s-1980 s s-1990 s Could increase be explained by improved water quality (heavy metals & TBT) or could this be temperature (climate change) related? What is happening elsewhere?
6 Slipper Limpet Case Studies French Context Slipper Limpet Case Study St Brieuc Bay (Slipper-limpet distribution in Bay of Saint-Brieuc, in 1994) 1994: 250,000t Now: 450,000t
7 Slipper Limpet Case Studies French Context Slipper Limpet Case Study Mont St Michel Bay (Distribution de la crépidule en baie du Mont Saint-Michel (Blanchard et Ehrhold, 1999).) 1997: 100,000t : 43,000t removed 2004: 150,000t
8 Slipper Limpet Case Studies French Context Slipper Limpet Case Study Bay of Brest (Ref. CREOCEAN) Note: ,500t to ,000t
9 Slipper Limpet and Oyster Monitoring CEFAS, Oyster and Slipper Limpet Survey, 7-9 March DEFRA/MFA Reference: FEP 736 Slipper Limpet Density (2006) Parameter Mean Maximum No. chains/100m No. ind. /m Potential ind. /m2 No Slipper Limpet Stock Biomass Year CEFAS Survey Potential (16% dredge efficiency) t 420t t (84.5t) 1025t (528t) t 669t
10 Management Utilisation Trial Objective: to try utilise material with a minimum of cost and keep pace with growth Best Case: 10t/yr (CEFAS survey with 10% biomass growth rate/yr) Worst Case: ~200t/yr (Potential at ~16% dredge efficiency and 30% biomass growth rate/yr) Target: Trial First Year 25t/yr
11 Trial Season A Partnership A) Oystermen removal Oysterman collection 12.5t over Oct-Mar 0.5t/week assuming 50kg/boat and x10 boat days/wk B) Harbour Authority removal + collection Harbour Authority collection 12.5t over Apr-June 1.0t/week assuming 250kg/boat and x4 boat days/wk C) Local scallop processor shucking D) Local sports fishing bait supplier packing freezing for aquarium/bait markets E) Potting bait production F) Garden centres and specialist technical products shell related products
12 Management Monitoring Population biomass Hotspot identification Treatment Options Removal by suction dredge Killing by smothering Crushing Fishermen Removal Develop new techniques (e.g. pheromone traps?) Related Management Issues (for Fal oyster fishery) Chain harrowing Weed clearing Laying of cultch
13 % Mortality % Mortality Management Possibilities - Brine Rinsing SYVRET, M. & FITZGERALD, A., SLIPPER LIMPET MORTALITY TRIALS, SEED MUSSEL PROJECT. SEAFISH INNOVATION PRIMER RESEARCH AWARD 100% 90% 80% Mussel Slipper Limpet Slipper Limpet (<30mm) 70% Ambient Conditions Mortality After 3 Days 60% 50% 40% 30% 20% 10% 0% 100% Air Exposure Brine Rinse Repeat Brine Rinse 1hr soak Test Condition 90% 80% 70% Mussel Slipper Limpet Slipper Limpet (<30mm) Chiller Conditions Mortality After 3 Days 60% 50% 40% 30% 20% 10% 0% Air Exposure Brine Rinse Repeat Brine Rinse 1hr soak Test Condition
14 Utilisation Possibilities- Shell FITZGERALD, A. (2007). SHELL AGGREGATES REPORT - UK WASTE PRODUCTION. SEAFISH INNOVATION PRIMER RESEARCH AWARD Shell Wholesale aggregates Bagged aggregates Specialist aggregates Cultch Oyster Settlement of slipper limpet shell Photo: Antony Jensen Shell in Waste Water Treatment Resin Bound Aggregates From: Shell Rendering
15 Utilisation Possibilities- Flesh Flesh Animal consumption Human consumption Aquarium/bait Whelk/Crab bait Smoked slipper limpets! Bait Sticks Scallop in binder & whelk and crab in mussel sock FITZGERALD, A. (2008). SHELLFISH FLESH WASTE IN BAIT REPORT. SEAFISH INNOVATION PRIMER RESEARCH AWARD
16 The Future?
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