Scottish Marine and Freshwater Science Vol 6 No 8: Effects of AC Magnetic Fields (MFs) on Swimming Activity in European Eels Anguilla anguilla

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Figure 1 Schematic, side, and plan views of the annular tank in which the experiment took place. The tank was filled to a point just below the top of the mesh-covered framework (to the level marked "W") to ensure fish had to swim through one of the four MF coils in order to move around the tank.

( a)

( b)

Figure 2 ( a) Schematic top view of the shape of the MF generated by a single pair of coils. Numbers in squares show the MF strength measured in each 10 x 10 cm grid square relative to the positions of the MF generator coils (black vertical bars). Measurements were made in air and are given in µT using an AC input of 2 V (0.2 A) for calibration purposes at the time of installation. Measurements in ( a) were made in the plane represented by the dashed lines in ( b). Note that the MF extended in front of and behind the coils, and that MF strength diminished to approximately 50 % of the maximum when 30 cm in front of or behind the coils.

Figure 3 The number of passes made by "swimmers" ( n = 10) through coils during the 4-hour period between 12:00 and 16:00 hours according to status of the coils (active â- ; inactive â-¡).

Figure 4 Scatterplot to show the relationship between the total number of passes through coils during the 4-hour period between 12:00 and 16:00 hours and eel size, expressed as total length ( LT, cm).

Table 1 Details of eels used in the experiment.

						Coils A and B		Coils C and D
Experiment phase	Nominal fish number	Trial date	First coils activated	LT (cm)	Swimming status	Passes when active	Passes when inactive	Passes when active	Passes when inactive
1	1	19/01/2012	A and B	85	Swimmer	7	0	0	7
1	2	24/01/2012	C and D	58	Non-swimmer	0	0	0	0
1	3	25/01/2012	A and B	85	Swimmer	1	1	1	0
1	4	26/01/2012	C and D	42	Non-swimmer	0	0	0	0
1	5	27/01/2012	A and B	84	Swimmer	19	0	0	24
1	6	30/01/2012	C and D	36	Swimmer	1	0	0	0
1	7	31/01/2012	A and B	34	Non-swimmer	0	0	0	0
1	8	01/02/2012	C and D	31	Non-swimmer	0	0	0	0
1	9	02/02/2012	C and D	38	Non-swimmer	0	0	0	0
1	10	06/02/2012	C and D	35	Non-swimmer	0	0	0	0
1	11	07/02/2012	A and B	35	Non-swimmer	0	0	0	0
1	12	09/02/2012	C and D	35	Non-swimmer	0	0	0	0
2	13	21/08/2012	A and B	31	Non-swimmer	0	0	0	0
2	14	23/08/2012	C and D	34	Non-swimmer	0	0	0	0
2	15	28/08/2012	A and B	96	Swimmer	5	2	5	4
2	16	30/08/2012	C and D	84	Swimmer	0	3	2	0
2	17	04/09/2012	A and B	65	Swimmer	0	0	3	2
2	18	06/09/2012	C and D	85	Swimmer	0	8	9	0
2	19	13/09/2012	A and B	88	Non-swimmer	0	0	0	0
2	20	20/09/2012	C and D	32	Swimmer	0	3	0	0
2	21	26/09/2012	A and B	35	Non-swimmer	0	0	0	0
2	22	27/09/2012	C and D	34	Non-swimmer	0	0	0	0
2	23	02/10/2012	A and B	34	Non-swimmer	0	0	0	0
2	24	04/10/2012	C and D	35	Non-swimmer	0	0	0	0
2	25	08/10/2012	A and B	34	Non-swimmer	0	0	0	0
2	26	09/10/2012	C and D	32	Non-swimmer	0	0	0	0
2	27	10/10/2012	A and B	31	Swimmer	2	0	0	0
2	28	16/10/2012	C and D	33	Non-swimmer	0	0	0	0