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Factors affecting buoyancy in the eggs of Bairdiella icistia (Pisces: Sciaenidae)

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Abstract

Several aspects of buoyancy were studied in the normally pelagic eggs of the sciaenid fish Bairdiella icistia (Jordan and Gilbert). Spawning fish acclimated to a low salinity (15‰) produced larger, more buoyant eggs which had a higher water content than eggs produced by fish living in ordinary sea water (33‰ S). Eggs fertilized in lower salinities were larger and more buoyant than eggs fertilized in higher salinities. The salinity of the medium during the first 5 to 7 min after fertilization had a lasting effect on egg buoyancy, but subsequent transfer to a different salinity also influenced buoyancy. Although egg buoyancy in this species can be influenced by the ambient salinity both before and after spawning, the capacity for adjusting buoyancy is limited, and eggs spawned in salinities lower than 30‰ would probably sink.

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Authors and Affiliations

  1. Hawaii Institute of Marine Biology, Kaneohe, Hawaii, USA

    R. C. May

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  1. R. C. May
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Communicated by O. Kinne, Hamburg

Based on a portion of a Ph.D. dissertation, University of California at San Diego, Scripps Institution of Oceanography.

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May, R.C. Factors affecting buoyancy in the eggs of Bairdiella icistia (Pisces: Sciaenidae). Marine Biology 28, 55–59 (1974). https://doi.org/10.1007/BF00389117

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  • DOI: https://doi.org/10.1007/BF00389117

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