Fig. 1

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Floating biologging package made from Balsa wood (45 × 20 × 16 mm; 14 g in air) that was attached to Northern pike. Post-release behaviour data (i.e., locomotor activity, depth, and temperature selection) was recorded with a Axy-5 XS biologger (A), while the biologging package was recovered using a radio transmitter (B). The biologging package was fastened to Northern Pike with two self-locking straps that were a tied together with 5–0 catgut suture and attached to the biologging package with the locking-heads (C).
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