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Refinement of acoustic-tagging protocol for twaite shad Alosa fallax (Lacépède), a species sensitive to handling and sedation

Bolland, Jonathan D.; Nunn, Andrew D.; Angelopoulos, Natalie V.; Dodd, Jamie R.; Davies, Peter; Gutmann Roberts, Catherine; Britton, J. Robert; Cowx, Ian G.


Natalie V. Angelopoulos

Peter Davies

Catherine Gutmann Roberts

J. Robert Britton

Ian G. Cowx


© 2018 Elsevier B.V. Telemetry investigations to gather essential information about fish migrations are reliant on the behaviour, condition and survival of the animals being unaltered by the tagging procedure. Twaite shad (Alosa fallax Lacépède; 'shad’) is a threatened clupeid fish for which there is a considerable knowledge gap on their anadromous movements. They are also reported to be sensitive to handling and anaesthesia, resulting in practical difficulties in tag implantation; previous investigations externally attached tags without sedation. The aim of this study was to incrementally refine the acoustic-tagging protocol for shad via application of a previously un-tried anaesthetic (i.e. tricaine methanesulphonate (MS-222)) and by surgical implantation of the tag in the peritoneal cavity. All captured shad (n = 25) survived handling, anaesthesia and tagging, and were detected moving upstream after release. Surgically implantation (n = 5) was significantly faster than externally mounting the tag (n = 20) and time to recover was similar. Total upstream movement, total movement, residence time in receiver array and speed of upstream movement were statistically similar for externally and internally tagged fish. Post-spawning, a large proportion (68%) of tagged fish returned to the estuary, downstream of the receiver array. Internal tagging under anaesthesia is recommended for studying anadromous movements of shad, given welfare benefits during surgery and once at liberty, thus increasing the likelihood of tagged fish performing natural behaviours. Further, implantation of tags programmed to last many years enables multiple spawning migrations by the same individuals to be studied, which would lead to substantial advances in ecological knowledge and potentially reduce the number of fish tagged.


Bolland, J. D., Nunn, A. D., Angelopoulos, N. V., Dodd, J. R., Davies, P., Gutmann Roberts, C., …Cowx, I. G. (2019). Refinement of acoustic-tagging protocol for twaite shad Alosa fallax (Lacépède), a species sensitive to handling and sedation. Fisheries research, 212, 183-187.

Journal Article Type Article
Acceptance Date Dec 9, 2018
Online Publication Date Jan 29, 2019
Publication Date 2019-04
Deposit Date Feb 7, 2019
Publicly Available Date Feb 8, 2019
Journal Fisheries Research
Print ISSN 0165-7836
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 212
Pages 183-187
Keywords Anadromous; Animal welfare; Iteroparous; Regulated procedure; Surgical implantation; Telemetry
Public URL
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