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Marine Ecology Progress Series

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MEPS 598:261-272 (2018)  -  DOI:

Statoliths of the whelk Buccinum undatum: a novel age determination tool

P. R. Hollyman1,*, M. J. Leng2, S. R. N. Chenery3, V. V. Laptikhovsky4, C. A. Richardson1

1School of Ocean Sciences, College of Natural Sciences, Bangor University, Menai Bridge, Anglesey LL59 5AB, UK
2NERC Isotope Geosciences Facilities, British Geological Survey, Nottingham NG12 5GG, UK
3Centre for Environmental Geochemistry, British Geological Survey, Nottingham NG12 5GG, UK
4Centre for Environment, Fisheries and Aquaculture Science (CEFAS), Pakefield Road, Lowestoft, Suffolk NR33 0HT, UK
*Corresponding author:
Advance View was available online April 24, 2017

ABSTRACT: Sustainability within the fisheries of the commercially important European whelk Buccinum undatum has become a major concern because of over-exploitation and increased landings in many European coastal shelf seas due to the expansion of export markets to East Asian countries. Current management of B. undatum populations is difficult to achieve as several life history traits are problematic to accurately monitor. The current method of age determination for stock assessment has a low success rate and focuses on the use of putative annual rings on the surface of the organic operculum. Here, we validate an annual periodicity of growth ring formation in B. undatum statoliths that provides an alternative, reliable and accurate method for determining a whelk’s age. Laboratory-reared juvenile B. undatum of known provenance and age deposited a hatching ring at the time of emergence from their egg capsule and a clearly defined growth ring during February of their first and second years. Stable oxygen isotope profiles from the shells of 2 adult whelks confirmed annual growth ring deposition by demonstrating seasonal cycles of δ18O in the shell that matched the relative position and number of visible growth rings in the statolith. Validation of annually resolved statolith growth rings will, for the first time, provide fisheries scientists with a tool to determine the age structure of B. undatum populations and allow analytical stock assessments that will enable informed decisions for future management practices of whelk fisheries.

KEY WORDS: Buccinum undatum · Statoliths · Age determination · Fisheries monitoring · Oxygen isotope · Raman spectroscopy · Sclerochronology

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Cite this article as: Hollyman PR, Leng MJ, Chenery SRN, Laptikhovsky VV, Richardson CA (2018) Statoliths of the whelk Buccinum undatum: a novel age determination tool. Mar Ecol Prog Ser 598:261-272.

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