Institut für Seefischerei
Palmaille 9, 22767 Hamburg Telefon 040 38905-108 Telefax 040 38905-263 02.09.2008 Az.: Pa../v.S./2683
„SOLEA“
Cruise 593 REPORT 14.08. - 28.08.2008
Personnel
Name Institution
Kay Panten SF
Karl-Heinz Becker SF
Jörg Berkenhagen SF
Thomas Kehlert SF
Christine Petersen-Frey SF
Melanie Reckord SF
Birger Kreutz Multimar
Objectives
1. To participate in the ICES co-ordinated “International Beam Trawl Survey” in the North Sea 2. Biological monitoring of the fish fauna in proposed FFH protected areas in the German Bight 3. Distribution of temperature and salinity in the area of investigation
Narrative (Fig. 1)
The port of Cuxhaven was left on 14.8., steaming over night with strong west wind to the area scheduled for the Beam Trawl Survey west of Jutland, north of the Danish border (ca. 55°N). On the second day of the survey priority was given to monitoring the FFH area “Dogger Tail End”. The following days the offshore stations were sampled from south to north, while the inshore stations were investigated from north to south. On August 23 the BTS-part was finished, and the FFH monitoring was continued at “Sylter Außenriff”. A call to Esbjerg Harbour served for a staff exchange and the unloading of the aquarium stock. The last station in the FFH area “Borkum Riffgrund” was finished on 27.8 and the cruise ended in Cuxhaven on 28.8.
Results (Fig. 2 – 10)
A total of 44 half an hour and valid hauls ware made using the 7m beam trawl. Additional 32 15min hauls were carried out in the FFH areas. At 52 stations salinity and temperature were measured.
The species composition distribution showed the usual geographic pattern with dab as the most frequent fish, followed by plaice.
Toward the north and the west soon the importance of long rough dab and starry ray in the biomass increases. Still, in the survey area some larger (up to 50 cm) plaice can be found, although quite sporadically.
Also in the FFH areas, nothing unusual was caught. In the Sylt area the common starfish (Asterias rubens) dominates with 80% in the catch composition.
Dipl.-Biol. K. Panten
2°E 3°E 4°E 5°E 6°E 7°E 8°E 9°E 53°N
53.5°N 54°N 54.5°N 55°N 55.5°N 56°N 56.5°N 57°N 57.5°N
58°N F2 F3 F4 F5 F6 F7 F8
44
43
42
41
40
39
38
37
36
35
Dogger Tail End
Sylter Aussenriff
Borkum Riffgrund
Fig. 1: “Solea“, Cruise no. 593 , Haul positions and area of investigation
Catch composition and length distribution during Beam Trawl Survey
LIMANDA LIMANDA 20.3%
PLEURONECTES PLATESSA
9.7%
ASTROPECTEN IRREGULARIS
23.6%
MICRASTERINA 11.1%
BUCCINUM UNDATUM 5.8%
PAGURIDAE 3.2%
ASTERIAS RUBENS 2.7%
Other Invertebrates 6.6%
Invertebrates 52%
RAJA RADIATA 7.2%
EUTRIGLA GURNARDUS 3.1%
HIPPOGLOSSOIDES PLATESSOIDES
3.5%
Other Fish 3.0%
PLEURONECTES PLATESSA
25.2%
ASTROPECTEN IRREGULARIS
13.0%
ASTERIAS RUBENS 12.2%
MICRASTERINA 10.3%
ECHINIDAE 4.3%
PORTUNIDAE 4.2%
other invertebrates 4.5%
Invertebrates 48%
CALLIONYMUS LYRA 0.8%
BUGLOSSIDIUM LUTEUM
0.8%
EUTRIGLA GURNARDUS 1.7%
LIMANDA LIMANDA 18.9%
other fish 4.2%
Fig. 2: Catch composition in 40-43F4&5 Fig. 3: Catch composition in 40-43F6&7 (offshore) (inshore)
0 20 40 60 80 100 120 140 160 180 200
0 5 10 15 20 25 30 35 40
Length class [cm]
rel. Frequency [‰]
0 20 40 60 80 100 120 140 160 180 200
0 5 10 15 20 25 30 35 40
Length class [cm]
rel. Frequency [‰]
Fig. 4: Length distribution of Dab in 40-43F4&5 Fig. 5: Length distribution of Dab in 40-43F6&7
0 20 40 60 80 100 120 140 160 180 200
0 5 10 15 20 25 30 35 40 45 50 55 60
Length class [cm]
rel. Frequency [‰]
0 20 40 60 80 100 120 140 160 180 200
0 5 10 15 20 25 30 35 40 45 50 55 60
Length class [cm]
rel. Frequency [‰]
Fig. 6: Length distribution of Plaice in 40-43F4&5 Fig. 7: Length distribution of Plaice in 40-43 F6&7
Catch composition and length distribution during FFH Monitoring
BUGLOSSIDIUM LUTEUM
2.0%
PLEURONECTES PLATESSA
1.8%
CALLIONYMUS LYRA 1.7%
ARNOGLOSSUS LATERNA
0.4%
LIMANDA LIMANDA 0.4%
ASTERIAS RUBENS 79.4%
PORTUNIDAE 7.4%
Other Invertebrates 5.7%
Other Fish 1.2%
Invertebrates 92.5%
Fig. 8: Catch composition in FFH-Area „Sylter Aussenriff“
LIMANDA LIMANDA 31.2%
PLEURONECTES PLATESSA
18.0%
MICROSTOMUS KITT 4.1%
BUGLOSSIDIUM LUTEUM
3.3%
ASTROPECTEN IRREGULARIS
12.4%
PAGURIDAE 11.6%
ASTERIAS RUBENS 5.8%
BUCCINUM UNDATUM 3.3%
PORTUNIDAE 1.6%
Other Invertebrates 2.0%
Invertebrates 37%
Other Fish 6.6%
Fig. 9: Catch composition in FFH-Area „Dogger Tail End“
PLEURONECTES PLATESSA
16.6%
LIMANDA LIMANDA 11.5%
BUGLOSSIDIUM LUTEUM
7.5%
CALLIONYMUS LYRA 3.6%
ARNOGLOSSUS LATERNA
2.8%
ASTERIAS RUBENS 38.3%
ASTROPECTEN IRREGULARIS
6.6%
PORTUNIDAE 3.2%
Other Invertebrates 4.9%
Invertebrates 53%
Other Fish 5.2%
Fig. 10: Catch composition in FFH-Area „Borkum Riffgrund“
