Federal Research Institute for Rural Areas, Forestry and Fisheries

Thünen-Institute of Sea Fisheries

Palmaille 9, 22767 Hamburg Telephone +4940 38905-108 Telefax +4940 38905-263 16.09.2016 Az.: Pa./vS/4100

„SOLEA“ Cruise 724 REPORT 16.08. – 01.09.2016

Personnel

Name Institution

Kay Panten SF Jeremy Hübner SF Thomas Kehlert SF Birger Kreutz Multimar Karin Krüger SF Yannick Ruhbaum SF Juliane Schuster SF

Objectives

1. Participation in the ICES co-ordinated “International Beam Trawl Survey” in the North Sea 2. Determination of temperature and salinity in the area of investigation

Narrative (Fig. 1)

FRV “Solea” left the port of Cuxhaven on 17th August. Working started the next day by sampling the ICES statistical rectangle 39F6 to 39F4 followed by the offshore stations from South to North. On the late afternoon of 24th August the survey was interrupted in the Danish harbor of Hanstholm where the representative of Multimar has left the ship with the living aquarium stock. On the morning of the 26th FRV “Solea” disembarked the port and the research was continued in the rectangles 42F7 and 42F6. Under good weather conditions the coastal stations were sampled thereafter from North to South. At noon on the 30st August the final haul of the survey was conducted. Work in the FFH area “Sylter

2

Aussenriff” were started in the afternoon and finish the next day. The cruise ended on the 1st September at noon in Cuxhaven and the scientific staff returned to Hamburg.

Results (Fig. 2 – 8)

A total of 73 valid hauls with a standard duration of 30 minutes were conducted with the 7m beam trawl. At 65 stations salinity and temperature were measured. The distribution of composition shows the usual geographic pattern with dab as the most frequent fish species, followed by plaice, grey gurnard and lemon sole. Towards the North of the investigation area the importance of dab in the biomass decreases. Here, plaice is only occurring sporadically with some larger (up to 50 cm) individuals.

Dipl.-Biol. K. Panten

3

F3 F4 F5 F6 F7 F8 F9 58°N

44

57.5°N 37 3538 36

21 43 39 23 20 33 22 34 24 26 28 29 27 30 32 57°N 25 31 40 19 41

42 18 42 17 44 16 45 43 56.5°N 46

51 15 13 49 47 50 41 52 14 12 48

56°N 53 9 54 10 11 58 56 55 8 57 59 40

55.5°N 7 3 60 6 61 4 39 62 5 2 63 55°N 1 64 6968 716570 67 73 7266 38

54.5°N

37

54°N

36

53.5°N

35

53°N 3°E 4°E 5°E 6°E 7°E 8°E 9°E

10°E

Fig. 1: “Solea“, Cruise no. 724 , Haul positions and area of investigation

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Catch composition in kg and length distribution during Beam Trawl Survey

Asterias rubens; Eutrigla gurnardus; 47.0 508.4 Lophius piscatorius; Porifera; 221.5 22.6 Lophius piscatorius; Astropecten Solea solea; 48.2 38.7 irregularis; 380.4 Hippoglossoides other Fish; 59.3 Pagurus bernhardus; platessoides; 45.0 182.4 Buglossidium luteum; Pagurus bernhardus; other Fish; 122.2 Amblyraja radiata; Neptunea antiqua; 122.2 211.6 65.3 177.6 Astropecten ; Microstomus kitt; Pleuronectes irregularis; 157.7 151.6 82.7 platessa; 1265.2 Buccinum undatum; Liocarcinus holsatus; Limanda limanda; Wirbellose; 119.1 102.9 267.1 1506.1 Wirbellose; Asterias rubens; Liocarcinus 1815.1 118.1 depurator; 78.8 Luidia sarsii; 109.9 Strongylocentrotus Modiolus modiolus; Pleuronectes droebachiensis; 68.5 104.3 platessa; 437.2 Buccinum undatum; Spatangus 53.6 purpureus; 56.6 Arctica islandica; 45.7 Aphrodita aculeata; Limanda limanda; 40.9 1273.6 Luidia sarsii; 37.4 other Invertebrates; 218.0 other Invertebrates; 176.2

Fig. 2: Catch composition in 39-43F4&5 Fig. 3: Catch composition in 39-43F6&7, 43F8&9 (offshore) (inshore)

120 120

100 100

80 80

60 60 rel. Frequency [‰] rel. Frequency [‰]

40 40

20 20

0 0 5 10152025303540 5 10152025303540 Length class [cm] Length class [cm]

Fig. 4: Length distribution of Dab in 39-43F4&5 Fig. 5: Length distribution of Dab in 39-43F6&7, 43F8&9

100 100

90 90

80 80

70 70

60 60

50 50

40 40 rel. Frequency [‰] rel. Frequency [‰]

30 30

20 20

10 10

0 0 5 101520253035404550556065 5 101520253035404550556065 Length class [cm] Length class [cm]

Fig. 6: Length distribution of Plaice in 39-43F4&5 Fig. 7: Length distribution of Plaice in 39-43 F6&7, 43F8&9

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Catch composition and length distribution during FFH Monitoring

Asterias rubens; 458.9

Callionymus Liocarcinus holsatus; lyra; 2.8 68.3 other Fish; 5.3 Arnoglossus Pagurus bernhardus; laterna; 2.8 54.4

Astropecten Agonus irregularis; 11.8 cataphractus; 8.1

Buglossidium Liocarcinus luteum; 8.9 depurator; 10.9 Wirbellose; Pleuronectes 642.0 Cancer pagurus; 9.2 platessa; 40.1 Spisula solida; 6.7

Ensis; 3.5

Lutraria ; 3.0 Limanda limanda; 70.3 Carcinus maenas; 3.0

other Invertebrates; 12.2

Fig. 8: Catch composition in FFH-Area „Sylter Aussenriff“