Fig. 1
From: Bringing data to the surface: recovering data loggers for large sample sizes from marine vertebrates
Data logger float package recovery system. ADL–VHF float packages were attached to the first dorsal fin of sharks (a) using a tether with a built-in galvanic timed release (red arrow). The shark depicted here is a 222-cm TL sandbar shark (C. plumbeus). The GTR corrodes after a set amount of time and the float package detaches from the fin, floating upright on the surface (b), so that it can be detected and tracked down using a VHF receiver (c) and recovered. See Whitmore et al. [28] for additional information on the data logger float package