Citation:

j.seares.2013.06.004

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Abstract:

Groundfish survey data from the German Bight from 1902-08, 1919-23, and 1930-1932 and ICES International Bottom Trawl Survey (IBTS) quarter 3 data from 1991 to 2009 were analysed with respect to species frequencies, maximum length, trends in catch-per-unit-effort, species richness parameters (SNR) and presence of large fish (Phi40), the latter defined as average presence of species per haul with specimens larger than 40 cm given. Four different periods are distinguished: (a) before 1914 with medium commercial CPUE and low landings, Phi40 approx. 2, high abundance in elasmobranchs and SNR conditions indicating highly diverse assemblages, (b) conditions immediately after 1918 with higher commercial CPUE, recovering landings, Phi40 at > 4 in 1919, and SNR conditions indicating highly diverse assemblages, (c) conditions from 1920 to the early 1930's with decreasing commercial CPUE, increased landings, decreasing Phi40, SNR conditions similar to later years indicating less diverse assemblages, and a decrease in elasmobranchs. In the IBTS series (d), Phi40 remains low indicating an increased rarity of large specimens, and SNR characteristics are similar to the third period. Dab, whiting and grey gurnard have increased considerably in the IBTS series as compared to the historic data. Phi40 is suggested an alternative indicator reflecting community functional diversity when weight based indicators cannot be applied.

Coverage:

Latitude: 54.380000 * Longitude: 7.620000

Date/Time Start: 1902-08-01T00:00:00 * Date/Time End: 2009-08-01T00:00:00

Event(s):

German_Bight * Latitude: 54.380000 * Longitude: 7.620000 * Location: German Bight, North Sea * Method/Device: Multiple investigations (MULT)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Comment
1	DATE/TIME	Date/Time			Geocode
2	Comment	Comment		Fock, Heino O	Time series
3	Eutrigla gurnardus, catch per unit effort	E. gurnardus CPUE	kg/30 min	Fock, Heino O
4	Gadus morhua, catch per unit effort	G. morhua CPUE	kg/30 min	Fock, Heino O
5	Limanda limanda, catch per unit effort	L. limanda CPUE	kg/30 min	Fock, Heino O
6	Melanogrammus aeglefinus, catch per unit effort	M. aeglefinus CPUE	kg/30 min	Fock, Heino O
7	Merluccius merluccius, catch per unit effort	M. merluccius CPUE	kg/30 min	Fock, Heino O
8	Pleuronectes platessa, catch per unit effort	P. platessa CPUE	kg/30 min	Fock, Heino O
9	Raja clavata, catch per unit effort	R. clavata CPUE	kg/30 min	Fock, Heino O
10	Squalus acanthias, catch per unit effort	S. acanthias CPUE	kg/30 min	Fock, Heino O
11	Solea vulgaris, catch per unit effort	S. vulgaris CPUE	kg/30 min	Fock, Heino O
12	Conversion factor	Conv fac		Fock, Heino O	Roundfish
13	Conversion factor	Conv fac		Fock, Heino O	Flatfish
14	Eutrigla gurnardus, catch per unit effort	E. gurnardus CPUE	kg/30 min	Fock, Heino O	corrected
15	Gadus morhua, catch per unit effort	G. morhua CPUE	kg/30 min	Fock, Heino O	corrected
16	Limanda limanda, catch per unit effort	L. limanda CPUE	kg/30 min	Fock, Heino O	corrected
17	Melanogrammus aeglefinus, catch per unit effort	M. aeglefinus CPUE	kg/30 min	Fock, Heino O	corrected
18	Merluccius merluccius, catch per unit effort	M. merluccius CPUE	kg/30 min	Fock, Heino O	corrected
19	Pleuronectes platessa, catch per unit effort	P. platessa CPUE	kg/30 min	Fock, Heino O	corrected
20	Raja clavata, catch per unit effort	R. clavata CPUE	kg/30 min	Fock, Heino O	corrected
21	Squalus acanthias, catch per unit effort	S. acanthias CPUE	kg/30 min	Fock, Heino O	corrected
22	Solea vulgaris, catch per unit effort	S. vulgaris CPUE	kg/30 min	Fock, Heino O	corrected

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

693 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 Date/Time	2 Comment (Time series)	3 E. gurnardus CPUE [kg/30 min]	4 G. morhua CPUE [kg/30 min]	5 L. limanda CPUE [kg/30 min]	6 M. aeglefinus CPUE [kg/30 min]	7 M. merluccius CPUE [kg/30 min]	8 P. platessa CPUE [kg/30 min]	9 R. clavata CPUE [kg/30 min]	10 S. acanthias CPUE [kg/30 min]	11 S. vulgaris CPUE [kg/30 min]	12 Conv fac (Roundfish)	13 Conv fac (Flatfish)	14 E. gurnardus CPUE [kg/30 min] (corrected)	15 G. morhua CPUE [kg/30 min] (corrected)	16 L. limanda CPUE [kg/30 min] (corrected)	17 M. aeglefinus CPUE [kg/30 min] (corrected)	18 M. merluccius CPUE [kg/30 min] (corrected)	19 P. platessa CPUE [kg/30 min] (corrected)	20 R. clavata CPUE [kg/30 min] (corrected)	21 S. acanthias CPUE [kg/30 min] (corrected)	22 S. vulgaris CPUE [kg/30 min] (corrected)
1902	Historical	0.2945	4.2780	0.1107	24.0049	1.7786	8.3591	0.3589	3.3679	0.0544	3.60	2.5	1.0602	15.4008	0.2768	86.4176	6.4030	20.8978	0.8973	8.4198	0.1360
1903	Historical	2.0570	0.9340	3.1153	2.6312	0.1578	16.1085	1.0796	2.1454	0.3165	3.60	2.5	7.4052	3.3624	7.7883	9.4723	0.5681	40.2713	2.6990	5.3635	0.7913
1904	Historical	3.9075	0.9690	9.0777	3.7355	0.0810	23.9519	1.2493	0.0725	0.6941	3.60	2.5	14.0670	3.4884	22.6943	13.4478	0.2916	59.8798	3.1233	0.1813	1.7353
1905	Historical	1.2090	1.0350	4.9575	15.2834	0.0000	25.0669	0.5008	0.0000	0.4346	3.60	2.5	4.3524	3.7260	12.3938	55.0202	0.0000	62.6673	1.2520	0.0000	1.0865
1906	Historical	1.0980	1.7614	3.3532	18.0667	0.0000	3.1519	0.0439	0.1374	0.0664	3.25	2.1	3.5685	5.7246	7.0417	58.7168	0.0000	6.6190	0.0922	0.4466	0.1394
1907	Historical	0.3925	1.0995	6.4223	2.6497	0.1126	16.4409	0.9528	0.1957	0.1866	3.25	2.1	1.2756	3.5734	13.4868	8.6115	0.3660	34.5259	2.0009	0.6360	0.3919
1908	Historical	1.2337	5.1660	4.7419	9.1511	0.6741	13.7070	0.0375	0.2403	0.0903	3.25	2.1	4.0094	16.7895	9.9580	29.7411	2.1908	28.7847	0.0788	0.7810	0.1896
1919	Historical	0.0728	15.4670	3.0570	0.6385	0.0000	37.3479	2.5458	1.0000	1.1351	3.25	2.1	0.2364	50.2678	6.4197	2.0751	0.0000	78.4306	5.3462	3.2500	2.3837
1920	Historical	0.1338	2.2603	1.6889	8.5495	0.0000	25.4743	1.2282	0.0693	0.6243	3.25	2.1	0.4347	7.3458	3.5467	27.7859	0.0000	53.4960	2.5792	0.2252	1.3110
1921	Historical	1.4370	8.2200	3.5418	8.7131	0.4166	31.8835	0.7399	0.1849	0.7659	3.25	2.1	4.6703	26.7150	7.4378	28.3176	1.3540	66.9554	1.5538	0.6009	1.6084
1923	Historical	0.5925	0.4915	4.1672	0.8417	0.0000	39.3362	2.4524	0.3377	0.7112	3.60	2.5	2.1330	1.7694	10.4180	3.0301	0.0000	98.3405	6.1310	1.2157	1.7780
1930	Historical	1.0085	4.4025	2.1234	8.1495	0.1810	38.3745	0.3826	0.0171	0.6269	3.60	2.5	3.6306	15.8490	5.3085	29.3382	0.6516	95.9363	0.9565	0.0616	1.5673
1931	Historical	0.0877	1.7570	0.8771	1.6848	0.0000	45.1853	0.3454	0.0894	0.6651	3.25	2.1	0.2849	5.7103	1.8419	5.4756	0.0000	94.8891	0.7253	0.2906	1.3967
1932	Historical	0.1920	1.3130	7.2790	0.5169	0.0000	45.5587	0.2584	0.0000	0.5190	3.25	2.1	0.6240	4.2673	15.2859	1.6799	0.0000	95.6733	0.5426	0.0000	1.0899
1991	IBTS	2.8294	1.7241	44.1998	0.1828	0.5179	15.9387	0.0000	0.0440	0.1513	1.00	1.0	2.8294	1.7241	44.1998	0.1828	0.5179	15.9387	0.0000	0.0440	0.1513
1992	IBTS	3.2726	10.8263	38.9628	0.8859	0.4877	6.0408	0.0000	0.0000	0.0605	1.00	1.0	3.2726	10.8263	38.9628	0.8859	0.4877	6.0408	0.0000	0.0000	0.0605
1993	IBTS	1.9761	5.2020	31.7964	0.6765	0.3719	8.2807	0.0000	0.0940	0.0329	1.00	1.0	1.9761	5.2020	31.7964	0.6765	0.3719	8.2807	0.0000	0.0940	0.0329
1994	IBTS	4.6437	5.1048	28.1537	0.0457	0.4134	3.8142	0.0000	0.0531	0.0944	1.00	1.0	4.6437	5.1048	28.1537	0.0457	0.4134	3.8142	0.0000	0.0531	0.0944
1995	IBTS	3.7150	9.2243	14.1983	4.9601	0.7526	2.0533	0.0000	0.0000	0.0535	1.00	1.0	3.7150	9.2243	14.1983	4.9601	0.7526	2.0533	0.0000	0.0000	0.0535
1996	IBTS	4.7679	1.3635	28.5314	0.0284	0.4072	2.8232	0.0000	0.0689	0.0174	1.00	1.0	4.7679	1.3635	28.5314	0.0284	0.4072	2.8232	0.0000	0.0689	0.0174
1997	IBTS	4.7435	5.4147	58.0994	1.2334	0.1487	5.8361	0.0000	0.3963	0.0293	1.00	1.0	4.7435	5.4147	58.0994	1.2334	0.1487	5.8361	0.0000	0.3963	0.0293
1998	IBTS	5.0830	2.0083	49.5433	0.3225	0.1413	12.7699	0.0000	0.0000	0.0744	1.00	1.0	5.0830	2.0083	49.5433	0.3225	0.1413	12.7699	0.0000	0.0000	0.0744
1999	IBTS	7.0329	2.4708	47.1788	0.2775	0.4473	10.6434	0.0000	0.0000	0.0300	1.00	1.0	7.0329	2.4708	47.1788	0.2775	0.4473	10.6434	0.0000	0.0000	0.0300
2000	IBTS	5.5591	2.3981	28.3750	4.7742	0.4036	4.3649	0.0000	0.0000	0.0114	1.00	1.0	5.5591	2.3981	28.3750	4.7742	0.4036	4.3649	0.0000	0.0000	0.0114
2001	IBTS	11.4770	4.4800	69.2699	3.1275	0.2559	5.3534	0.0007	0.0000	0.0096	1.00	1.0	11.4770	4.4800	69.2699	3.1275	0.2559	5.3534	0.0007	0.0000	0.0096
2002	IBTS	6.6662	1.6399	67.1405	1.4463	0.1709	4.7791	0.0000	0.0000	0.0076	1.00	1.0	6.6662	1.6399	67.1405	1.4463	0.1709	4.7791	0.0000	0.0000	0.0076
2003	IBTS	7.1110	0.5476	55.0917	0.0053	0.3383	7.4367	0.0000	0.0000	0.0103	1.00	1.0	7.1110	0.5476	55.0917	0.0053	0.3383	7.4367	0.0000	0.0000	0.0103
2004	IBTS	3.2833	0.1481	36.1943	0.0464	0.3859	4.2451	0.0000	0.0000	0.0077	1.00	1.0	3.2833	0.1481	36.1943	0.0464	0.3859	4.2451	0.0000	0.0000	0.0077
2005	IBTS	7.2189	0.6795	43.6044	0.1877	0.8391	7.8626	0.0000	0.0000	0.0090	1.00	1.0	7.2189	0.6795	43.6044	0.1877	0.8391	7.8626	0.0000	0.0000	0.0090
2006	IBTS	6.5905	2.9376	24.5609	1.2027	0.6911	5.5467	0.0000	0.0000	0.0022	1.00	1.0	6.5905	2.9376	24.5609	1.2027	0.6911	5.5467	0.0000	0.0000	0.0022
2007	IBTS	6.7071	0.2978	44.5192	0.0122	0.1060	11.4353	0.0000	0.0000	0.0218	1.00	1.0	6.7071	0.2978	44.5192	0.0122	0.1060	11.4353	0.0000	0.0000	0.0218
2008	IBTS	3.8062	1.8053	50.7809	0.2609	0.9666	14.2345	0.0000	0.0000	0.0418	1.00	1.0	3.8062	1.8053	50.7809	0.2609	0.9666	14.2345	0.0000	0.0000	0.0418
2009	IBTS	6.4963	1.4390	30.2681	0.3201	0.2537	9.7251	0.0758	0.0000	0.0056	1.00	1.0	6.4963	1.4390	30.2681	0.3201	0.2537	9.7251	0.0758	0.0000	0.0056