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Daily otolith increments and recruitment in two coral-reef wrasses, Thalassoma bifasciatum and Halichoeres bivittatus

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Abstract

Increments on the otoliths of two common coral reef fishes, the bluehead wrasse Thalassoma bifasciatum and the slippery dick Halichoeres bivittatus, were demonstrated by mark-recapture experiments to be daily. Otoliths were marked in two ways; by depriving fish of light, food, and temperature cycles and also by supplemental feeding in the field. Both experiments were performed in late 1980 in the San Blas Islands of Panamá. A mark corresponding to settlement of the planktonic larva onto the reef was found on the otoliths of the bluehead wrasse. This settlement mark was used to calculate the dates of settlement of a collection of juveniles of this species taken from a patch reef in the San Blas Islands of Panamá in 1981. Settlement occurred in short and irregular bursts. The number of daily increments before the settlement mark indicates a planktonic larval life of 40 to 72 d.

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Authors and Affiliations

  1. Department of Biological Sciences, University of California at Santa Barbara, 93106, Santa Barbara, California, USA

    B. C. Victor

  2. Marine Science Institute, University of California at Santa Barbara, 93106, Santa Barbara, California, USA

    B. C. Victor

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  1. B. C. Victor
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Communicated by N. D. Holland, La Jolla

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Victor, B.C. Daily otolith increments and recruitment in two coral-reef wrasses, Thalassoma bifasciatum and Halichoeres bivittatus . Mar. Biol. 71, 203–208 (1982). https://doi.org/10.1007/BF00394631

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