Monitoring Fishery Catch to Assist Scientific Stock Assessments in Scottish Inshore Fisheries
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1 Monitoring Fishery Catch to Assist Scientific Stock Assessments in Scottish Inshore Fisheries and Identifying Catch Composition to Improve Scottish Inshore Fisheries Management using Technology to Enable Self-Reporting SeaScope Fisheries Research Ltd. Project Manager Grant Course Acknowledgement: Prepared for: Seafish Industry Authority. Comment and review by: Marine Scotland. Funded by: European Fisheries Fund (EFF)
2 Project Aims Recruit and train inshore vessels to self-sample catches for Data Deficient Stocks on Scottish West Coast Brown Crab Lobster Velvet Crab Scallops Nephrops (not a data deficient stock) Verify with Electronic Monitoring (EM) equipment Carry out subprojects investigating novel approaches for monitoring using technology
3 Vessel geographic distribution Produced by Ali McKnight
4 Electronic monitoring AMR EM System with control box, cameras (3), GPS, winch rotation sensor, hydraulic pressure sensor, screen and keyboard
5 Archipelago Marine Research v4.5 and v5 units
6 Equipment setup examples
7 EM sensor data example All Haul Positions
8 Sensor Data Day View
9 Video example
10 Sampling Summary EM systems 11 vessels for 6 months 703 fishing trips undertaken 568 provided good quality self-sampled data 85% 6136 strings/tows were self-reported on the valid trips Over 180,000 creels were deployed 96% of trips provided EM data majority of losses due to human error Video review on 12% of valid trips 68 trips, 618 strings, 19,002 creels 36 At-Sea Observer trips completed Control and Biological Data (21 trips) collected over 7400 length and sex measurements Weight estimates for retained and discarded catch segments Data for the 4 Sub-projects (15 trips)
11 Data Comparisons in Report Video Review v Self-reported Retained count and weight Discarded count and weight Sex ratios count, weight, by eye estimate Fishing effort Catches per unit effort Video Review v At Sea Observer Pot by Pot Comparisons Retained and discarded counts Sex ratios
12 Example of Video Review data - Sex ratio and numbers able to be sexed during video review, for brown crab and velvet crab 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% % Brown Crab - Discarded Velvet Crab - Discarded Brown Crab - Retained Velvet Crab - Retained Male Female Percentage of viewed crabs sexed 32% 25% 76% 25%
13 Video Review v At-Sea Observer e.g. Pot by Pot Comparisons: 763 Creels (overall 1 crab difference in totals 578:579) Conclusion very similar results so EM video analysis is accurate and able to provide useful catch data.
14 Technology Subprojects RFID Tags System installed with 2 readers and horns, linked to EM system
15 RFID Plots GPS track data overlaid with RFID summary data Individual pot location plotted using RFID and GPS and summary table of soak time Next Steps (?) further develop the integrated system; improve ruggedness and reliability; roll out on larger scale
16 Data Logger Cefas datalogger temperature and depth
17 19/06/ /06/ /06/ /07/ /07/ /07/ /07/ /07/ /07/ /08/ /08/ /08/ /08/ /08/2015 Depth (m) DST depth profile Date Max Depth (m) Min Depth (m)
18 Modified Discard Chute Chute design 3 cameras, a shaded area to eliminate sun glare, and a small hopper (not shown) to allow more automated delivery
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21 Self Sampled Biological Data Aim to have fishermen gather verified length and sex data without undue burden Mitutoyo digital callipers fitted with Bluetooth adaptor Male/female buttons, vibration, length data sent to tablet/phone/laptop, Excel.
22 Crab calliper video
23 Project conclusions Self-Sampling Fishermen are capable of providing large quantities of good quality data (85% datasheet returns), which could easily be improved Self-sampling provides good retained catch estimates less reliable on discard estimates especially when large quantities good effort data for days at sea and strings number of creels are usually underestimated sex ratio data reliability varied depending on how data was collected soak time is unreliable as strings have varied times on same trip length data can be provided efficiently using Bluetooth callipers
24 Electronic Monitoring EM works on smaller inshore vessels and can verify self-reported catch data (96% success but most issues related to install errors not system errors <1%) EM sensors and video review provides Excellent counts of retained and discarded catches, weights are harder to obtain 100% of collected effort data at location days at sea/strings/tows deployed Excellent creel counts on reviewed trips only (RFID may automate all hauls) Soak time more difficult to obtain than expected (RFID/DST may resolve this) Sex ratios obtainable for crabs but not lobsters, discards harder to see and time consuming (modified chute may help) Length data obtainable from video review using modified chute (also counts and sex)
25 Thank you for listening SeaScope Fisheries Research Ltd. Acknowledgement: Prepared for: Seafish Industry Authority. Comment and review by: Marine Scotland. Funded by: European Fisheries Fund (EFF)
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