1. Demersal Longline Set & Haul Information and Catch Composition
Trinidad Photo: Tietze, U.; Thiele, W.; Lasch, R.; Thomsen, B; Rihan, D. Economic performance and fishing efficiency of marine capture fisheries. FAO Fisheries Technical Paper. No Rome, FAO p.
Trinidad longliner, 2005, FAO Fisheries Technical Paper. No. 482

2. Data collection priorities
Estimate effort for each gear deployment;
Identify every individual caught in subsample and estimate percent retained;
Collect biological information on target and other identified species as requested;
Record all sightings and interactions with marine mammals and sea turtles;
Record vessel and fishing gear characteristics.

3. Objectives
List 8 elements on the Set & Haul Information form and describe how each is collected
Define fishing effort
Describe the catch composition sampling process
List 3 pieces of equipment needed on deck
Demonstrate ability to select and describe one random sampling procedure
Demonstrate ability to complete the Set & Haul Information (incl. calculation of Total Catch) and Catch Composition forms

4. Set & Haul Information Form
1 per set
Fishing effort – time & amount of gear fished
Catch per unit effort (CPUE)

5. Set & Haul Information Form1
LJA
ABC

6. Set & Haul Information Form

7. Set & Haul Information Form

8. Set & Haul Information Form

9. Set & Haul Information Form

10. Set & Haul Information Form

11. Set & Haul Information Form

12. Set & Haul Information Form

13. Set & Haul Information Form

14. Set & Haul Information Form

15. Total Catch Estimation
Total catch must be estimated for every set.  
Weigh entire catch (method 1)
Captain / vessel estimate (method 5)
Catch / effort ratio (method 6) - unsampled
Catch / effort ratio (method 7) – tally sample
Σ Sample weights from similar sets
Σ Tallied hooks from similar sets
X Total hooks in unsampled set
Sample weight (kg)
Hooks in sample
X Total hooks in set

16. Set & Haul Information Form
Questions on Set & Haul information?
Practice exercise
Groups of 2

17. Z SLE CVX (?)
N W O
N W V X 1 60 50
3000
1200
1.0
1 100

18. Total catch = (1395.67/1800) *3000 = 3494.175 kg ≈ 3.49 MT
CTL
300
Total catch = ( /1800) *3000 = kg ≈ 3.49 MT
Hooks/section = 597/10 = 59.7 ≈60
Ave gangion length: / 30 =

19. Catch Composition Multiple sets/day – how to choose? Observer logbook
Sets/day Random sample table (RST) None – Sample all sets RST#1
5+ RST#2

20. Catch Composition Tally sample (ST=4)
Count all individual species as they come out of water
Separate tally for discard/dropped
How much to sample? 1/3 to ½ of hooks deployed

21. Catch Composition Selecting gear for tally sample
Systematic spatial with random start
Random spatial
Systematic temporal
Random temporal
Catch along bottom can be highly variable
*Preferred

22. Catch Composition Form

23. Catch Composition Form

24. Catch Composition Form

25. Catch Composition Form
Weights
Actual
Average weight * total count
Estimate

26. Catch Composition Form

27. Catch Composition Form

28. Activity
Questions on catch composition sampling / random sampling or the form?
Activity #2
Groups of 2
Assigned a sample type
Design how you will sample a set with 12 gear units of 50 hooks
Tally sample & complete Catch Comp form

29. Tally Sampling Activity
Key to “symbols”
Shark
Purple body
Stingray
Redfish
Flatfish
Octopus
Empty hook
Snail
Flying fish
Starfish

30. Tally Sampling Activity
Key to “symbols”
Dropped

31. Gear unit #1 8 9 2 7 3 4 6 5 1 10

32. Gear unit #2 2 10 5 3 4 6 7 8 9 1

33. Gear unit #3 8 3 1 10 6 2 7 5 9 4

34. Gear unit #4 2 3 6 10 9 1 5 4 8 7

35. Gear unit #5 1 8 6 10 3 5 2 7 4 9

36. Gear unit #6 1 2 8 3 6 9 5 4 10 7

37. Gear unit #7 7 9 3 4 6 5 10 1 8 2

38. Gear unit #8 6 3 5 8 9 4 1 2 10 7

39. Gear unit #9 2 1 10 6 3 5 9 7 8 4

40. Gear unit #10 8 4 3 2 9 10 6 7 5 1

41. Gear unit #11 10 3 5 8 7 4 2 1 9

42. Gear unit #12 8 6 3 1 4 7 5 9 10 2

43. Activity Did you have any trouble keeping up with the tally?
Take minutes to complete the catch composition form & make a total catch estimate.
What were your total catch estimates?
How does it compare to actual total weight of kg?
Why do you think there are differences?

44. Summary
List the elements on the Set and Haul Information form and describe how each is collected
How is fishing effort defined?
What are four ways to collect a random sample?
Describe the catch composition sampling process for demersal longlining
What gear is needed on deck for catch composition sampling

45. Random sample table
Choose one table per trip
Complete for each haul