The Danish research vessels Dana and Havfisken are used for the Danish participation in the Baltic International Trawl Survey (BITS), which, since 1982, has had the purpose of annually monitoring cod and other species.

Internationally, each nation surveys part of the area, with some overlap in coverage and depth stratification, in a coordinated sampling design. After agreement between countries a common standard trawl gear and standard sampling procedures were implemented in 2000, resulting in the consistent coverage of the western and central Baltic Sea.

The BITS is conducted twice a year in the first and fourth quarters as a depth-stratified survey. The strata are based on sub-divisions and depth layers. Each year the necessary stations are randomly selected before the beginning of the international trawl surveys, from a list of clear haul data. These stations are a stratified randomly selected sub-sample of the possible trawl tracks.

The standard haul is a 30-minutes haul with a towing speed of 3 knots. Trawling only takes place during daylight, defined as the time between 15 minutes past sunrise and 15 minutes before sunset.

Period

Quarter 1

Activity

Here is shown a map with the survey activity for both vessls. The map shows both valid and invalid stations, a station can be deemed invalid if the haoul could not be conducted within the guilines of the survey manual

Trawl Stations

Each trawl stations consists a haul of 30 minutes where all the catch documented, including litter. Biological samples to determine e.g. stock, age matuity are taken from individual fish.

Bongo Stations

Each bongo stationsions in conducted with a set of three bongonets, with net sizes 150, 300 and 500 micrometers. These are used for the registartion of fishlarvey, plankton abundance and jelly fish.

CTD Stations

CTD (Conductivity - Temperature - Depth), are measured trough the water column, and used to calculate e.g. the oxygen and salinity content, key environmental variables for life in the ocean.

CTD Results

Here is shown a map the results of the CTD measurments at the bottom. The heatmap is made with linear interpolation between measurments, and can be seen as the general trend in the monment of the survey. If any CTD stations are not plotted data has not yet been precessed

Bottom oxygen

Bottom temperature

Bottom salinity

Catch Overview

Below is a table with the total catche and catches for selected species, in wiegth and numbers. The numbers are in some instances calculated based on representative subsampling of some abundant species. The maps illustrates for biodiveity the number of different species cougt on each station, and for CPUE (catch per unit effort) the catch in numbers standadized to a unit effort of one hour of hauling.


	Weight (kg)	Number	Min. Length (mm)	Max. Length (mm)
Total Catch	60751.5	3580683
Sprat	29693.2	3033824	55	170
Herring	12836.0	410969	75	305
Cod	6728.3	18049	70	1060
Plaice	1627.4	12684	90	480
Sole	12.8	75	110	410

CPUE

CPUE (catch per unit effort) shown as the catch in Numbers rasied to to pr hour of hauling

CPUE for Selected Species

CPUE (catch per unit effort) shown as the catch in Numbers rasied to to pr hour of hauling. The dots indicates the stations, and red dots indicates that a species where not found at all in that station. The scale is different between plots

Cod

Plaice

Sole

Sprat

Herring

Biodiversity

Shown is the Number of species cought by station

Length Distributions

Here is shown the length distribution For the 10 most abundant comercieal species cought during the survey, allocated to each ship. The black line represents the average length distribution of the 5 years previus surveys.

Sprat

Herring

Common dab

Flounder

Cod

Whiting

Plaice

Hake

Mackerel

Grey gurnard

All Species Caught

The table below is an overview of all the different species cought in the survey, devided into the different ices areas covered by the surve.

Area 20


Latin name	English name	Weight (kg)	Number	Min. Length (mm)	Max. Length (mm)
Anarhichas lupus	Catfish	0.2	1	320	320
Arnoglossus laterna	Scaldfish	0.1	5	130	150
Callionymus lyra	Common dragonet	0.4	18	130	200
Chelidonichthys lucerna	Tub gurnard	0.0	2	80	120
Clupea harengus	Herring	555.6	24327	95	200
Eutrigla gurnardus	Grey gurnard	0.2	2	80	290
Gadus morhua	Cod	3.8	4	160	620
Hippoglossoides platessoides	American plaice	3.7	136	100	220
Hippoglossus hippoglossus	Atlantic halibut	0.2	1	290	290
Limanda limanda	Common dab	15.7	185	110	300
Lumpenus lampretaeformis	Snake blenny	0.1	4	210	240
Merlangius merlangus	Whiting	39.9	2039	90	230
Merluccius merluccius	Hake	0.2	3	190	260
Microstomus kitt	Lemon sole	0.1	2	150	190
Nephrops norvegicus	Norway lobster	1.0	16
Platichthys flesus	Flounder	0.3	2	230	230
Pleuronectes platessa	Plaice	3.4	37	110	390

Area 21


Latin name	English name	Weight (kg)	Number	Min. Length (mm)	Max. Length (mm)
Aequipecten opercularis	Queen scallop	0.4	8
Agonus cataphractus	Pogge	0.2	6	130	170
Amblyraja radiata	Starry ray	1.2	2	440	450
Ammodytes marinus	Lesser sandeel	0.1	7	165	195
Ammodytes tobianus	Sandeel	0.1	4	165	180
Arnoglossus laterna	Scaldfish	0.4	28	80	150
Buglossidium luteum	Solenette	0.0	2	70	70
Callionymus lyra	Common dragonet	2.7	212	80	230
Callionymus maculatus	Spotted dragonet	1.8	180	80	160
Cancer pagurus	Edible crab	4.2	6	152	192
Carcinus maenas	Common shore crab	0.2	1	60	60
Cephalopoda	Squids and octopusses	0.9	3
Clupea harengus	Herring	1691.3	77035	75	245
Crangon crangon	Common shrimp	0.0	2
Cyclopterus lumpus	Lumpfish	6.4	3	320	430
Enchelyopus cimbrius	Four-bearded rockling	0.1	2	150	220
Engraulis encrasicolus	Anchovy	0.4	36	80	150
Entelurus aequoreus	Snake pipefish	0.0	2	410	500
Eutrigla gurnardus	Grey gurnard	13.9	176	80	340
Gadus morhua	Cod	63.0	61	140	1060
Glyptocephalus cynoglossus	Witch	2.0	11	200	380
Hippoglossoides platessoides	American plaice	74.6	2822	60	320
Hyperoplus lanceolatus	Greater sandeel	1.0	46	180	230
Limanda limanda	Common dab	908.8	17689	70	350
Lithodes maja	Norway king crab	0.4	1	104	104
Lumpenus lampretaeformis	Snake blenny	0.9	62	160	290
Melanogrammus aeglefinus	Haddock	4.2	10	150	500
Merlangius merlangus	Whiting	586.4	9848	60	360
Merluccius merluccius	Hake	9.4	317	100	400
Microstomus kitt	Lemon sole	4.9	44	150	310
Mullus surmuletus	Striped red mullet	0.2	9	100	140
Myoxocephalus scorpius	Sculpin	5.7	40	110	300
Nephrops norvegicus	Norway lobster	26.5	437
Pandalus borealis	Northern pink shrimp	2.0	1
Petromyzon marinus	Sea lamprey	0.0	2	210	210
Platichthys flesus	Flounder	184.5	717	140	410
Pleuronectes platessa	Plaice	404.4	3220	100	450
Pollachius virens	Saithe	0.4	2	270	290
Pomatoschistus spp.	Sand gobies	0.0	2	60	90
Sardina pilchardus	Pilchard	2.8	189	110	150
Scomber scombrus	Mackerel	0.1	2	180	190
Scophthalmus maximus	Turbot	6.0	8	160	460
Scophthalmus rhombus	Brill	15.7	54	140	440
Solea solea	Sole	6.2	25	110	410
Sprattus sprattus	Sprat	1040.7	100778	70	170
Taurulus bubalis	Sea scorpion	4.6	43	80	260
Trachinus draco	Greater weever fish	4.4	30	180	410
Trachurus trachurus	Horse mackerel	0.5	33	110	160
Trisopterus esmarkii	Norway pout	1.3	99	80	150
Trisopterus minutus	Poor-cod	0.2	6	100	190
Zoarces viviparus	Eelpout	0.0	1	150	150

Area 22


Latin name	English name	Weight (kg)	Number	Min. Length (mm)	Max. Length (mm)
Agonus cataphractus	Pogge	1.4	54	110	180
Amblyraja radiata	Starry ray	15.5	20	420	460
Ammodytes marinus	Lesser sandeel	0.0	2	170	190
Ammodytes tobianus	Sandeel	0.0	3	175	200
Arnoglossus laterna	Scaldfish	0.5	25	110	160
Callionymus lyra	Common dragonet	0.5	35	80	210
Callionymus maculatus	Spotted dragonet	0.1	6	90	160
Carcinus maenas	Common shore crab	1.2	7	37	70
Cephalopoda	Squids and octopusses	0.0	6
Clupea harengus	Herring	542.2	33535	75	270
Crangon crangon	Common shrimp	0.0	11
Cyclopterus lumpus	Lumpfish	1.8	1	360	360
Eutrigla gurnardus	Grey gurnard	0.9	16	140	270
Gadus morhua	Cod	44.4	41	100	850
Gaidropsarua macrohthalmus	Big-eye rockling	0.2	1	67	67
Gasterosteus aculeatus	Three-spined stickleback	0.3	134	40	70
Gobiidae	True gobies	0.5	47	50	160
Gobius niger	Black goby	0.1	3	110	120
Hippoglossoides platessoides	American plaice	30.8	438	60	310
Hyperoplus lanceolatus	Greater sandeel	0.1	5	170	215
Limanda limanda	Common dab	1371.5	31526	60	340
Lumpenus lampretaeformis	Snake blenny	0.1	7	160	240
Merlangius merlangus	Whiting	135.6	3650	60	390
Merluccius merluccius	Hake	0.4	7	170	310
Microstomus kitt	Lemon sole	9.3	35	180	300
Myoxocephalus scorpius	Sculpin	24.6	232	80	320
Mytilus edulis	Blue mussel	108.0	0
Pholis gunnellus	Butter fish	0.0	2	130	140
Platichthys flesus	Flounder	193.5	668	100	450
Pleuronectes platessa	Plaice	693.0	6270	90	460
Pomatoschistus spp.	Sand gobies	0.0	16	50	100
Scophthalmus maximus	Turbot	6.7	10	140	430
Scophthalmus rhombus	Brill	1.4	11	160	330
Solea solea	Sole	5.9	48	120	340
Sprattus sprattus	Sprat	2213.3	182960	55	150
Symphodus melops	Corkwing	0.0	1	140	140
Syngnathidae	Pipefishes and seahorses	0.0	1	130	130
Taurulus bubalis	Sea scorpion	29.5	277	80	270
Trachurus trachurus	Horse mackerel	0.3	20	110	140
Trisopterus esmarkii	Norway pout	0.0	1	80	80
Trisopterus minutus	Poor-cod	0.0	2	70	90
Zoarces viviparus	Eelpout	1.2	35	100	270

Area 23


Latin name	English name	Weight (kg)	Number	Min. Length (mm)	Max. Length (mm)
Aequipecten opercularis	Queen scallop	0.1	2
Arnoglossus laterna	Scaldfish	0.0	1	160	160
Callionymus lyra	Common dragonet	0.0	1	160	160
Clupea harengus	Herring	182.5	10612	85	305
Cyclopterus lumpus	Lumpfish	5.6	3	310	420
Gadus morhua	Cod	3013.1	4650	260	820
Hippoglossoides platessoides	American plaice	0.7	8	150	300
Limanda limanda	Common dab	196.7	1453	130	330
Melanogrammus aeglefinus	Haddock	0.8	1	480	480
Merlangius merlangus	Whiting	91.5	401	150	430
Merluccius merluccius	Hake	0.2	1	320	320
Microstomus kitt	Lemon sole	1.1	3	260	370
Petromyzon marinus	Sea lamprey	0.0	1	180	180
Platichthys flesus	Flounder	72.6	259	150	400
Pleuronectes platessa	Plaice	337.2	1393	170	470
Pollachius virens	Saithe	1.4	4	330	350
Scophthalmus maximus	Turbot	3.0	4	230	410
Scophthalmus rhombus	Brill	1.5	3	230	450
Solea solea	Sole	0.7	2	320	330
Sprattus sprattus	Sprat	178.3	11475	65	160
Trachurus trachurus	Horse mackerel	0.0	2	120	130

Area 24


Latin name	English name	Weight (kg)	Number	Min. Length (mm)	Max. Length (mm)
Gadus morhua	Cod	41.0	94	260	530
Hyperoplus lanceolatus	Greater sandeel	0.0	1	205	205
Limanda limanda	Common dab	3.1	21	150	270
Merlangius merlangus	Whiting	0.0	2	130	140
Myoxocephalus scorpius	Sculpin	0.4	1	280	280
Platichthys flesus	Flounder	13.7	71	120	380
Pleuronectes platessa	Plaice	3.8	19	180	350
Scophthalmus maximus	Turbot	2.8	4	240	400
Sprattus sprattus	Sprat	0.0	2	95	100

Area 25


Latin name	English name	Weight (kg)	Number	Min. Length (mm)	Max. Length (mm)
Alosa fallax	Twaite shad	0.1	2	190	220
Clupea harengus	Herring	9864.4	265460	80	295
Cyclopterus lumpus	Lumpfish	2.3	8	150	240
Enchelyopus cimbrius	Four-bearded rockling	3.6	49	70	340
Engraulis encrasicolus	Anchovy	0.2	20	130	150
Eutrigla gurnardus	Grey gurnard	0.0	1	140	140
Gadus morhua	Cod	3563.0	13199	70	680
Gasterosteus aculeatus	Three-spined stickleback	1.5	958	30	70
Hyperoplus lanceolatus	Greater sandeel	0.4	27	150	200
Limanda limanda	Common dab	0.8	6	200	250
Merlangius merlangus	Whiting	101.0	1062	130	440
Myoxocephalus scorpius	Sculpin	81.0	319	140	300
Mytilus edulis	Blue mussel	32.3	0
Osmerus eperlanus	European smelt	0.1	1	230	230
Platichthys flesus	Flounder	5285.2	27129	140	410
Pleuronectes platessa	Plaice	185.6	1745	130	480
Pollachius virens	Saithe	0.2	1	230	230
Pomatoschistus spp.	Sand gobies	0.0	1	50	50
Saduria entomon	Saduria	0.1	31
Scomber scombrus	Mackerel	65.8	197	210	460
Scophthalmus maximus	Turbot	3.3	11	210	290
Sprattus sprattus	Sprat	26260.9	2738608	65	165
Trachurus trachurus	Horse mackerel	1.4	76	110	170
Trisopterus esmarkii	Norway pout	0.0	1	110	110
Trisopterus minutus	Poor-cod	0.1	1	290	290
Zoarces viviparus	Eelpout	0.0	1	200	200

Quarter 4

Activity

Trawl Stations

Each trawl stations consists a haul of 30 minutes where all the catch documented, including litter. Biological samples to determine e.g. stock, age matuity are taken from individual fish.

Bongo Stations

Each bongo stationsions in conducted with a set of three bongonets, with net sizes 150, 300 and 500 micrometers. These are used for the registartion of fishlarvey, plankton abundance and jelly fish.

CTD Stations

CTD (Conductivity - Temperature - Depth), are measured trough the water column, and used to calculate e.g. the oxygen and salinity content, key environmental variables for life in the ocean.

CTD Results

Bottom oxygen

Bottom temperature

Bottom salinity

Catch Overview


	Weight (kg)	Number	Min. Length (mm)	Max. Length (mm)
Total Catch	25334.8	1033349
Sprat	7079.3	582516	10	170
Herring	6794.2	215706	45	310
Cod	2610.1	12134	30	990
Plaice	844.5	5647	70	470
Sole	45.2	271	110	390

CPUE

CPUE (catch per unit effort) shown as the catch in Numbers rasied to to pr hour of hauling

CPUE for Selected Species

Cod

Plaice

Sole

Sprat

Herring

Biodiversity

Shown is the Number of species cought by station

Length Distributions

Sprat

Herring

Whiting

Common dab

Horse mackerel

Cod

Plaice

Norway pout

Flounder

Grey gurnard

All Species Caught

The table below is an overview of all the different species cought in the survey, devided into the different ices areas covered by the surve.

Area 20


Latin name	English name	Weight (kg)	Number	Min. Length (mm)	Max. Length (mm)
Arnoglossus laterna	Scaldfish	0.2	14	90	150
Callionymidae	Dragonets	6.2	233	80	220
Cephalopoda	Squids and octopusses	0.1	0
Clupea harengus	Herring	5.1	550	75	195
Enchelyopus cimbrius	Four-bearded rockling	0.1	1	250	250
Eutrigla gurnardus	Grey gurnard	0.5	12	110	230
Gadus morhua	Cod	13.3	803	80	360
Glyptocephalus cynoglossus	Witch	0.1	1	260	260
Hippoglossoides platessoides	American plaice	4.2	48	130	270
Limanda limanda	Common dab	61.0	502	120	300
Lumpenus lampretaeformis	Snake blenny	0.1	4	170	250
Melanogrammus aeglefinus	Haddock	0.0	1	160	160
Merlangius merlangus	Whiting	164.1	7451	70	250
Merluccius merluccius	Hake	7.1	30	180	350
Microstomus kitt	Lemon sole	0.3	4	120	220
Nephrops norvegicus	Norway lobster	0.3	6
Platichthys flesus	Flounder	0.2	1	270	270
Pleuronectes platessa	Plaice	6.8	57	150	280
Scomber scombrus	Mackerel	8.2	47	220	370
Sprattus sprattus	Sprat	60.5	5293	95	130
Squalus acanthias	Spurdog	1.4	8	330	380
Trachinus draco	Greater weever fish	0.1	1	260	260
Trachurus trachurus	Horse mackerel	0.0	7	60	90
Trisopterus esmarkii	Norway pout	0.0	2	110	110
Trisopterus minutus	Poor-cod	0.0	1	140	140

Area 21


Latin name	English name	Weight (kg)	Number	Min. Length (mm)	Max. Length (mm)
Agonus cataphractus	Pogge	0.1	4	140	180
Alosa fallax	Twaite shad	0.7	1	420	420
Amblyraja radiata	Starry ray	0.3	1	370	370
Ammodytes marinus	Lesser sandeel	4.5	309	145	200
Anguilla anguilla	Eel	0.7	1	700	700
Arnoglossus laterna	Scaldfish	1.2	128	50	150
Buglossidium luteum	Solenette	0.1	10	80	110
Callionymidae	Dragonets	28.8	3320	60	210
Callionymus lyra	Common dragonet	2.0	69	80	240
Callionymus maculatus	Spotted dragonet	0.2	33	80	120
Cancer pagurus	Edible crab	19.3	31	130	180
Cephalopoda	Squids and octopusses	11.6	1948	80	80
Chelidonichthys lucerna	Tub gurnard	1.7	6	230	330
Chelon labrosus	Thick lipped mullet	0.0	1	150	150
Clupea harengus	Herring	343.5	15490	70	300
Crangon crangon	Common shrimp	0.5	210
Enchelyopus cimbrius	Four-bearded rockling	5.2	152	110	300
Engraulis encrasicolus	Anchovy	9.0	615	100	190
Eutrigla gurnardus	Grey gurnard	24.9	659	70	360
Gadus morhua	Cod	24.7	971	70	680
Glyptocephalus cynoglossus	Witch	4.0	28	120	400
Gobius niger	Black goby	0.0	4	90	110
Hippoglossoides platessoides	American plaice	130.2	5922	50	280
Hyperoplus lanceolatus	Greater sandeel	0.9	45	165	250
Labrus bergylta	Ballan wrasse	0.1	3	110	140
Limanda limanda	Common dab	1414.5	27994	80	290
Lithodes maja	Norway king crab	1.0	2
Lumpenus lampretaeformis	Snake blenny	0.9	85	130	270
Melanogrammus aeglefinus	Haddock	18.6	571	110	200
Merlangius merlangus	Whiting	787.2	43512	60	310
Merluccius merluccius	Hake	54.8	391	70	380
Microstomus kitt	Lemon sole	18.2	181	110	300
Molva molva	Ling	0.5	8	120	330
Myoxocephalus scorpius	Sculpin	6.6	53	110	260
Myxine glutinosa	Hagfish	0.0	1	260	260
Nephrops norvegicus	Norway lobster	74.9	1742
Pandalus borealis	Northern pink shrimp	7.4	162
Pholis gunnellus	Butter fish	0.2	8	180	180
Platichthys flesus	Flounder	53.0	278	120	410
Pleuronectes platessa	Plaice	198.1	1382	110	430
Pomatoschistus spp.	Sand gobies	0.2	41	60	100
Raja clavata	Thornback ray	3.0	1	740	740
Scomber scombrus	Mackerel	34.4	159	130	420
Scophthalmus maximus	Turbot	3.3	5	270	390
Scophthalmus rhombus	Brill	33.4	93	200	510
Scyliorhinus canicula	Lesser-spotted dogfish	0.0	1	200	200
Solea solea	Sole	11.2	80	160	330
Sprattus sprattus	Sprat	284.1	21922	60	155
Squalus acanthias	Spurdog	12.4	8	250	820
Symphodus melops	Corkwing	0.1	8	60	110
Trachinus draco	Greater weever fish	267.1	3026	90	360
Trachurus trachurus	Horse mackerel	36.4	4319	60	380
Trisopterus esmarkii	Norway pout	57.3	5442	70	130
Trisopterus luscus	Bib	0.0	1	160	160
Trisopterus minutus	Poor-cod	0.7	25	100	180
Zeugopterus punctatus	Topknot	0.1	7	90	90
Zoarces viviparus	Eelpout	0.1	1	250	250

Area 22


Latin name	English name	Weight (kg)	Number	Min. Length (mm)	Max. Length (mm)
Agonus cataphractus	Pogge	0.7	31	110	180
Amblyraja radiata	Starry ray	0.6	1	420	420
Arctica islandica	Ocean quahaug	99.4	0
Arnoglossus laterna	Scaldfish	0.7	49	70	170
Buglossidium luteum	Solenette	0.0	1	80	80
Callionymus lyra	Common dragonet	2.3	67	80	220
Callionymus maculatus	Spotted dragonet	0.4	44	80	180
Cancer pagurus	Edible crab	1.2	2	140	160
Cephalopoda	Squids and octopusses	0.1	50
Chelidonichthys lucerna	Tub gurnard	1.1	7	220	260
Chelon labrosus	Thick lipped mullet	0.1	3	150	160
Clupea harengus	Herring	258.9	11909	90	240
Ctenolabrus rupestris	Goldsinny	0.0	1	90	90
Enchelyopus cimbrius	Four-bearded rockling	0.1	2	160	230
Engraulis encrasicolus	Anchovy	0.4	36	80	170
Eutrigla gurnardus	Grey gurnard	12.2	221	120	280
Gadus morhua	Cod	26.6	1111	70	790
Gasterosteus aculeatus	Three-spined stickleback	0.1	82	40	70
Glyptocephalus cynoglossus	Witch	0.0	1	160	160
Gobius niger	Black goby	0.5	19	80	150
Hippoglossoides platessoides	American plaice	27.2	554	70	290
Hyperoplus lanceolatus	Greater sandeel	0.1	4	175	220
Labrus bergylta	Ballan wrasse	0.2	3	130	150
Limanda limanda	Common dab	1401.0	38445	50	300
Lumpenus lampretaeformis	Snake blenny	0.4	29	150	280
Lycodes gracilis	Vahls eelpout	0.0	3	120	170
Melanogrammus aeglefinus	Haddock	0.3	5	180	200
Merlangius merlangus	Whiting	797.5	32171	70	270
Merluccius merluccius	Hake	1.3	6	270	360
Microstomus kitt	Lemon sole	1.3	8	220	290
Mullus surmuletus	Striped red mullet	0.4	27	90	140
Myoxocephalus scorpius	Sculpin	16.2	205	80	250
Pholis gunnellus	Butter fish	0.1	4	170	170
Platichthys flesus	Flounder	69.5	472	100	420
Pleuronectes platessa	Plaice	185.0	1987	70	440
Pomatoschistus spp.	Sand gobies	7.5	633	30	140
Scomber scombrus	Mackerel	1.2	8	150	390
Scophthalmus maximus	Turbot	12.2	24	190	420
Scophthalmus rhombus	Brill	10.4	37	130	450
Solea solea	Sole	29.1	173	110	390
Sprattus sprattus	Sprat	1500.1	122440	60	165
Symphodus melops	Corkwing	0.2	9	60	140
Trachinus draco	Greater weever fish	2.8	48	90	320
Trachurus trachurus	Horse mackerel	103.6	12219	60	140
Trisopterus esmarkii	Norway pout	1.0	59	50	170
Zoarces viviparus	Eelpout	2.5	94	100	300

Area 23


Latin name	English name	Weight (kg)	Number	Min. Length (mm)	Max. Length (mm)
Ammodytes marinus	Lesser sandeel	0.2	14	150	185
Arnoglossus laterna	Scaldfish	0.2	9	80	150
Callionymidae	Dragonets	0.0	2	100	150
Callionymus maculatus	Spotted dragonet	0.0	3	100	100
Cephalopoda	Squids and octopusses	0.4	270
Clupea harengus	Herring	36.6	1505	100	275
Eutrigla gurnardus	Grey gurnard	1.2	8	140	360
Gadus morhua	Cod	530.0	365	80	990
Gobius niger	Black goby	0.0	3	70	90
Hippoglossoides platessoides	American plaice	3.5	55	110	290
Hyperoplus lanceolatus	Greater sandeel	0.6	29	160	245
Limanda limanda	Common dab	138.8	1633	60	330
Melanogrammus aeglefinus	Haddock	2.0	1	630	630
Merlangius merlangus	Whiting	71.4	1515	80	330
Merluccius merluccius	Hake	0.6	5	210	320
Microstomus kitt	Lemon sole	0.4	1	330	330
Myoxocephalus scorpius	Sculpin	0.3	2	170	230
Mytilus edulis	Blue mussel	395.5	0
Nephrops norvegicus	Norway lobster	0.1	1
Platichthys flesus	Flounder	29.4	119	140	370
Pleuronectes platessa	Plaice	109.8	313	180	470
Pollachius virens	Saithe	0.7	1	420	420
Scophthalmus maximus	Turbot	1.4	2	270	360
Scophthalmus rhombus	Brill	6.3	10	190	480
Solea solea	Sole	4.8	17	220	380
Sprattus sprattus	Sprat	63.7	5536	70	165
Syngnathidae	Pipefishes and seahorses	0.0	1	380	380
Trachinus draco	Greater weever fish	0.1	2	180	190
Trachurus trachurus	Horse mackerel	21.1	3134	60	110

Area 24


Latin name	English name	Weight (kg)	Number	Min. Length (mm)	Max. Length (mm)
Ammodytes marinus	Lesser sandeel	0.0	4	160	170
Clupea harengus	Herring	379.6	15017	85	270
Enchelyopus cimbrius	Four-bearded rockling	0.0	1	170	170
Engraulis encrasicolus	Anchovy	0.1	11	80	140
Gadus morhua	Cod	146.7	1053	80	670
Hyperoplus lanceolatus	Greater sandeel	4.3	256	165	200
Limanda limanda	Common dab	111.1	1086	60	330
Merlangius merlangus	Whiting	73.4	2329	80	390
Myoxocephalus scorpius	Sculpin	4.2	29	140	260
Mytilus edulis	Blue mussel	223.4	0
Platichthys flesus	Flounder	218.3	812	60	370
Pleuronectes platessa	Plaice	124.4	583	80	420
Pomatoschistus spp.	Sand gobies	0.1	18	50	160
Scomber scombrus	Mackerel	0.2	4	170	190
Scophthalmus maximus	Turbot	17.2	46	180	390
Scophthalmus rhombus	Brill	5.2	11	260	430
Scyphozoa	Scyphozoans	0.7	0
Solea solea	Sole	0.2	1	250	250
Sprattus sprattus	Sprat	210.3	15096	70	155
Trachurus trachurus	Horse mackerel	3.4	430	60	120
Zoarces viviparus	Eelpout	0.3	4	170	320

Area 25


Latin name	English name	Weight (kg)	Number	Min. Length (mm)	Max. Length (mm)
Agonus cataphractus	Pogge	0.1	8	50	180
Clupea harengus	Herring	5770.4	171235	45	310
Cyclopterus lumpus	Lumpfish	2.5	6	180	220
Enchelyopus cimbrius	Four-bearded rockling	0.9	20	90	330
Engraulis encrasicolus	Anchovy	0.1	5	120	150
Gadus morhua	Cod	1868.8	7831	30	560
Gasterosteus aculeatus	Three-spined stickleback	14.8	6524	30	70
Hyperoplus lanceolatus	Greater sandeel	0.3	7	160	340
Limanda limanda	Common dab	0.2	2	160	250
Merlangius merlangus	Whiting	177.2	1124	90	420
Myoxocephalus scorpius	Sculpin	43.6	298	140	290
Mytilus edulis	Blue mussel	124.6	0
Platichthys flesus	Flounder	248.7	1149	150	420
Pleuronectes platessa	Plaice	220.4	1324	160	370
Pomatoschistus spp.	Sand gobies	0.1	145	50	50
Saduria entomon	Saduria	0.5	234
Scomber scombrus	Mackerel	0.3	1	320	320
Scophthalmus maximus	Turbot	2.8	7	220	320
Scophthalmus rhombus	Brill	0.5	1	320	320
Scyphozoa	Scyphozoans	44.3	0
Sprattus sprattus	Sprat	4960.7	412228	10	170
Trachurus trachurus	Horse mackerel	0.0	4	60	70
Zoarces viviparus	Eelpout	0.0	1	220	220

Danish Baltic International Trawl Survey

Period

Quarter 1

Activity

Trawl Stations

Bongo Stations

CTD Stations

CTD Results

Bottom oxygen

Bottom temperature

Bottom salinity

Catch Overview

CPUE

CPUE for Selected Species

Cod

Plaice

Sole

Sprat

Herring

Biodiversity

Length Distributions

Sprat

Herring

Common dab

Flounder

Cod

Whiting

Plaice

Hake

Mackerel

Grey gurnard

All Species Caught

Area 20

Area 21

Area 22

Area 23

Area 24

Area 25

Quarter 4

Activity

Trawl Stations

Bongo Stations

CTD Stations

CTD Results

Bottom oxygen

Bottom temperature

Bottom salinity

Catch Overview

CPUE

CPUE for Selected Species

Cod

Plaice

Sole

Sprat

Herring

Biodiversity

Length Distributions

Sprat

Herring

Whiting

Common dab

Horse mackerel

Cod

Plaice

Norway pout

Flounder

Grey gurnard

All Species Caught

Area 20

Area 21

Area 22

Area 23

Area 24

Area 25