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    Estimates of Age, Growth, and Settlement from Otoliths of Young-of-the-Year Kelp Bass (Paralabrax clathratus)

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    Subject
    Kelp Bass; Paralabrax clathratus; Age; Growth; Settlement; Otoliths; Young-of-the-Year
    Author
    Cordes, Jan F.; Allen, Larry G.
    Journal Title
    Scas: Bulletin of the Southern California Academy of Sciences
    Volume
    96
    Issue
    scas/vol96/iss2; 2
    Metadata
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    URI
    https://scholar.oxy.edu/handle/20.500.12711/9322
    Abstract
    Settled young-of-the-year (YOY) and older juvenile kelp bass {Par- <br /><br />alabrax clathratus) were collected off the coast of southern California during the <br /><br />summers of 1989 and 1990. Daily rings on the sagittae of settled YOY kelp bass <br /><br />were used to determine age, estimate growth, and construct ring width profiles <br /><br />for each fish. Laboratory-reared larvae revealed that ring deposition began on the <br /><br />third day after hatching, and confirmed the daily periodicity of ring deposition. <br /><br />The combined 1989-90 growth curve could be described as a linear regression <br /><br />with the equation (length (mm)) = 14.67 + 1 .69(age(days)) (r = .96), resulting <br /><br />in an average daily growth of 0.59 mm/day for the first 90 days of life. Back- <br /><br />calculated spawn dates suggested a possible lunar periodicity around the full <br /><br />moon. Settlement checks and otolith ring widths were used to determine the time <br /><br />of settlement and explore the possibility of delayed settlement in this species. The <br /><br />average age-at-settlement was calculated to be 30 days, with a range of 25-36 <br /><br />days. Only a single case of delayed settlement was evident from the increment- <br /><br />width profiles of 22 fish.
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