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the population biology of the thornback ray, raja clavata in caernarfon bay, north wales

Published online by Cambridge University Press:  06 October 2005

j.m. whittamore
Affiliation:
school of ocean sciences, university of wales—bangor, menai bridge, anglesey, ll59 5ab, uk school of biosciences, hatherly laboratories, university of exeter, exeter, ex4 4ps, uk
i.d. mccarthy
Affiliation:
school of ocean sciences, university of wales—bangor, menai bridge, anglesey, ll59 5ab, uk

Abstract

amid concern about the status of skates and rays in welsh waters the present work set out to provide up-to-date information on the population biology of raja clavata in caernarfon bay. the von bertalanffy growth parameters were l=100.9 cm, k=0.18 y−1 and t0=−0.95 y for males; and l=117.6 cm, k=0.16 y−1 and t0=−0.7 y for females. male r. clavata reached 50% maturity at 58.8 cm and 3.9 y, which was smaller and younger than females (l50 and a50 were 70.5 cm and 5.3 y, respectively). although previously over-exploited, the present estimate of total mortality (z) was 0.48–0.49 y−1 which, in terms of replacement mortality (calculated as 0.7 y−1), suggests no immediate prospect of recruitment failure for r. clavata in caernarfon bay. the potential for the recovery of a depleted population is discussed in relation to the allee effect.

Type
research article
Copyright
© 2005 marine biological association of the united kingdom

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