Abstract
Fish ages are often estimated by assuming an annual frequency of the band-like, growth-zones recorded in the largest of their otoliths, the sagittae. The total number of growth-zones are normally determined either by counting external growth-zones (whole otolith technique) or by examining otolith cross-sections (otolith section technique). The two techniques do not always yield the same age, however, particularly in older specimens of certain fishes. To resolve this problem, otoliths of the splitnose rockfish Sebastes diploproa were examined morphologically and were assayed for their natural radionuclide concentrations. Four age groups of otoliths were identified based on growth-zone counting; in the first three, whole otolith and otolith section age estimates agreed, while in the fourth, the otolith section age substantially exceeded the whole otolith age. Radiometric analysis demonstrated that all otoliths were deficient in 210Pb activity relative to 226Ra activity with the deficiency decreasing with increasing number of growth-zones. The magnitude of the 210Pb/226Ra radioactive disequilibrium in each otolith group, when compared to the number of growth-zones and the otolith weight histories derived with the two techniques, identifies the growth-zones revealed by otolith sections as annual features. Thus when otolith section age exceeds whole otolith age (usually occurring after 20 to 25 yr of age for this species), the otolith section technique is the correct method of age determination. Estimates of longevity in the genus Sebastes near 80 yr are therefore confirmed.
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Literature Cited
Beamish, R. J.: New information on the longevity of Pacific ocean perch (Sebastes alutus). J. Fish. Res. Bd Can. 36, 1395–1400 (1979)
Boehlert, G. W.: Timing of the surface-to-benthic migration in juvenile rockfish, Sebastes diploproa, off southern California. Fish. Bull., U.S. 75, 887–890 (1977)
Boehlert, G. W.: Size composition, age composition, and growth of the canary rockfish (Sebastes pinniger) and the splitnose rockfish (S. diploproa) from the 1977 Rockfish Survey. Mar. Fish. Rev. 42, 55–60 (1980)
Boehlert, G. W. and R. F. Kapperman: Variation of grwoth with latitude in two species of rockfish (Sebastes pinniger and S. diploproa) from the northeast Pacific Ocean. Mar. Ecol. Prog. Ser. 3, 1–10 (1980)
Dodge, R. E. and J. Thomson: The natural radiochemical and growth records in contemporary hermatypic corals from the Atlantic and Caribbean. Earth Planet. Sci. Lett. 23, 313–322 (1974)
FAO: Yearbook of fishery statistics, Vol. 46. Catches and landings, 1978. Rome: United Nations Food and Agriculture Organization 1979
Gunderson, D. R. and T. Sample: Distribution and abundance of rockfish off Washington, Oregon, and California during 1977. Mar. Fish. Rev. 42, 2–16 (1980)
Kelly, G. F. and R. S. Wolf: Age and growth of the redfish (Sebastes marinus) in the Gulf of Maine. Fish. Bull., U.S. 60, 1–31 (1959)
Mathieu, G. G.: 222Rn-226Ra technique of analyses, pp 1–30. In: Lamont-Doherty Geological Observatory annual Tech. Rep. COO-1185-Oto-ERDA 1977
Pannella, G.: Growth patterns in fish sagittae. In: Skeletal growth of aquatic organisms; biological records of environmental change, pp 519–560. Ed. by D. C. Rhoads and R. A. Lutz. New York: Plenum Press 1980
Power, G.: Fish population structure in arctic lakes. J. Fish. Res. Bd Can. 35, 53–59 (1978)
Ricker, W. E.: Computation and interpretation of biological statistics of fish populations. Bull. Fish. Res. Bd Can. 191, 382 pp. (1975)
Sandeman, E. J.: A contribution to the problem of age determination and growth-rate in Sebastes. Rapp. P.-V. Reun. Cons. Perm. Int. Explor. Mer 150, 276–284 (1961)
Westrheim, S. J.: Age determination and growth of Pacific ocean perch (Sebastes alutus) in the northeast Pacific Ocean. J. Fish. Res. Bd Can. 30, 235–247 (1973)
Williams, R. and B. C. Bedford: The use of otoliths for age determination. In: The ageing of fish, pp 114–123. Ed. by T. Bagenal. London: Unwin Brothers Limited 1974
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Communicated by S. K. Pierce, College Park
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Bennett, J.T., Boehlert, G.W. & Turekian, K.K. Confirmation of longevity in Sebastes diploproa (Pisces: Scorpaenidae) from 210Pb/226Ra measurements in otoliths. Mar. Biol. 71, 209–215 (1982). https://doi.org/10.1007/BF00394632
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DOI: https://doi.org/10.1007/BF00394632