Defining high-resolution dredge fishing grounds with Automatic Identification System (AIS) data

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Table 1

Descriptive statistics for each fishing zone for great scallop dredging in the western Bay of Brest identified from AIS data.

Descriptive statistics		Zone 1	Zone 2	Zone 3	Zone 4	Zone 5	Zone 6	Zone 7	All zones
S_a (km²)		1.90	1.59	0.91	0.56	0.45	0.11	0.02	5.54
D_f (h)	Oct. 2011	1.72	26.93	4.37	0	0	0	0	33.02
	Nov. 2011	68.99	57.92	46.01	2.37	5.12	2.68	0	183.09
	Dec. 2011	71.19	31.37	25.52	22.22	32.35	0.83	0	183.48
	Jan. 2012	20.29	3.36	22.37	7.51	2.85	0.02	0	56.40
	Feb. 2012	20.44	58.64	0.84	3.15	1.24	1.43	0.79	86.53
	Mar. 2012	8.84	13.79	0.05	0.38	5.56	0.94	0.88	30.44
	Total	191.47	192.01	99.16	35.63	47.12	5.90	1.67	572.96
I_f (h km⁻²)		100.94	121.11	108.80	63.55	104.63	53.52	75.08	103.42

Surface area (S_a) in square kilometres (km²), fishing duration (D_f) in hours (h) and fishing intensity (I_f) in hours per square kilometre (h km⁻²).

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