R1/3

Not to be cited without prior reference to the FRS Marine Laboratory, Aberdeen

FRV Clupea

Cruise 0407c

REPORT

15 - 30 March 2007

PORTS

Loading: 14 March, Fraserburgh Unloading: 31 March, Fraserburgh

Personnel

N Brown A4 (In-charge) P Gibson A4

Fishing Gear: Scallop Dredges

Cost to project: 16 days, M01T

Objectives

1. To carry out a survey of scallop stocks around .

2. To collect information on by-catches of other commercial fish and shellfish species.

3. To collect biological data on scallop growth rates.

Narrative

The scientific staff joined FRV Clupea at 0930 hours on 15 March, but due to bad weather, did not sail from Fraserburgh until 0600 on 20 March. Sampling began NE of Sumburgh at 0700 on 21 March and continued around Shetland until the survey was completed at 1400 on 29 March. Due to lost days at the start of the trip not all sampling positions were sampled on the first two days ,the original sampling program was reverted to once we received an additional two days at the end of the trip and the majority of the missed hauls were picked up. On completion Clupea set sail for Fraserburgh arriving back in Fraserburgh at 1000 on 30 March. All equipment and samples returned to the laboratory on 31 March.

Results

During the trip 82 dredge hauls were made and a total of 5542 scallops were caught. The position of each haul is shown on the map in Figure 1. Catch rates varied from a minimum of 1/hr to a maximum of 138.5/hr. The aggregate catch rates for each area, expressed in numbers per hour per metre width age, are shown in Figure 2. The individual graph headings in Figure 2 show the overall catch rate for each area. The length frequencies in numbers caught per half centimetre length category are shown in Figure 3. The numbers of each by-catch species caught is given in Table 1.

S Davis 18 July 2008 1 Shetland Scallop Survey 2007

61.00

60.50

60.00

-2.00 -1.50 -1.00 -0.50

2 Figure 2. Shetland Scallop Survey 2007

Catch Rate by Age in Area

Mousa - Sumburgh (cr 40.1) - (cr 30.2)

12.0

12.0 10.0 10.0 8.0 8.0 6.0 6.0 4.0

4.0 Nos.m.hour

Nos.m.hour 2.0 2.0 0.0 0.0 012345678910 012345678910 Age Age

Whalsay - Bressay (cr 49.1) (cr 24.0)

12.0 12.0 10.0 10.0 8.0 8.0 6.0 6.0 4.0 4.0 Nos.m.hour Nos.m.hour 2.0 2.0 0.0 0.0 012345678910 012345678910 Age Age

South Yell (cr 26.3) (cr 28.3)

12.0 12.0 10.0 10.0 8.0 8.0 6.0 6.0 4.0 4.0 Nos.m.hour Nos.m.hour 2.0 2.0 0.0 0.0 012345678910 012345678910 Age Age

Unst (cr 20.1) (cr 34.5)

5.0 10.0

4.0 8.0

3.0 6.0

2.0 4.0

Nos.m.hour 1.0 Nos.m.hour 2.0

0.0 0.0 012345678910 012345678910 Age Age

St Magnus Bay (cr 22.0) (cr 22.4)

6.0 6.0

4.0 4.0

2.0 2.0 Nos.m.hour Nos.m.hour 0.0 0.0 012345678910 012345678910 Age Age

48E8 (cr 40.1) 49E8 (cr 28.4)

8.0 6.0 5.0 6.0 4.0 4.0 3.0 2.0 2.0

Nos.m.hour Nos.m.hour 1.0 0.0 0.0 012345678910 012345678910 Age Age

49E9 (cr 22.4) 50E8 (cr 33.6)

5.0 10.0 4.0 8.0 3.0 6.0 2.0 4.0

Nos.m.hour 1.0 Nos.m.hour 2.0 0.0 0.0 012345678910 012345678910 Age Age

50E9 (cr 24.3)

5.0 4.0 3.0 2.0

Nos.m.hour 1.0 0.0 012345678910 Age

3 Figure 3. Shetland Scallop Survey 2007 Numbers at Size in Area

Mousa - Sumburgh (10% <100mm) Bressay - Mousa (20% <100mm) 200 200 150 150 100 100 50 50 0 0 3 4 5 6 7 8 9 10111213141516171819 345678910111213141516171819

Whalsay - Bressay (11% <100mm) Whalsay (10% <100mm) 200 200 150 150 100 100 50 50 0 0 3 4 5 6 7 8 9 10111213141516171819 345678910111213141516171819

South Yell (17% <100mm) Fetlar (18% <100mm) 200 200 150 150 100 100 50 50 0 0 3 4 5 6 7 8 9 10111213141516171819 345678910111213141516171819

Unst (cr 20.1) Yell Sound (cr 34.5) 200 200 150 150 100 100 50 50 0 0 3 4 5 6 7 8 9 10111213141516171819 3 4 5 6 7 8 9 10111213141516171819

St Magnus Bay (cr 22.0) Scalloway (cr 22.4) 200 200 150 150 100 100 50

Numbers Numbers 50 0 0 345678910111213141516171819 345678910111213141516171819 Length Length

48E8 (cr 40.1) 49E8 (cr 28.4) 400 400 300 300 200 200 100

Numbers 100 Numbers 0 0 345678910111213141516171819 345678910111213141516171819 Length Length

49E9 (cr 22.4) 50E8 (cr 33.6) 400 400 300 300 200 200 100

Numbers 100 Numbers 0 0 345678910111213141516171819 345678910111213141516171819 Length Length

50E9 (cr 24.3) 400 300 200 100 Numbers 0 345678910111213141516171819 Length

Table 1: Total number of each by-catch species

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SPECIES NUMBER CAUGHT Aequipecten opercularis 439 Aritica Islanica 19 buccinum undatum 85 Cancer pagurus M 98 Cancer pagurus F 44 Cancer pagurus B 1 Limanda limanda 2 hippoglossoides paeltssoides 1 Scyliorhinus canicula 2 Lophius piscatorius 61 Cyclopterus lumpus 2 Microstumus kitt 11 nephrops norvegicus 1 Necora puber M 1 Necora puber F 1 Neptunea antiqua 290 Pleuronectes platessa 12 Raja clavata M 1 Raja naevus M 14 Raja naevus F 12 Raja montagui M 4 lepidorhombus whiffiagonis 3 myoxocephalus scorpius 4 phrynorhombus norvegicus 1 glyptocephalus cynoglossus 1 TOTAL 1110

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