Determinate Versus Indeterminate Fecundity in American Shad, an Anadromous Clupeid

Autor: John E. Olney, A. Reid Hyle, Richard S. McBride
Rok vydání: 2014
Předmět:
Zdroj: Transactions of the American Fisheries Society. 143:618-633
ISSN: 1548-8659
0002-8487
DOI: 10.1080/00028487.2013.862178
Popis: Historical fecundity estimates of American Shad Alosa sapidissima used a determinate method that estimated annual fecundity as the standing stock of oocytes at a single point of time prior to spawning. Such fecundity estimates have been (1) reported for populations from the Canadian Maritimes to Florida, (2) applied to hypothesis tests of life history evolution, and (3) used in demographic models to advise management policy. However, American Shad have asynchronous development of yolked oocyte clutches, which suggests that new oocytes could arise after spawning commences, biasing the results of a determinate fecundity method downward. If so, annual fecundity should be a product of batch size and the number of batches—an indeterminate fecundity method. We investigated oocyte recruitment, atresia, and spawning intervals using gonad histology of females from the Mattaponi River, Virginia. Batch size (i.e., the number of hydrated oocytes prior to a spawning event) was estimated using a gravimetric met...
Databáze: OpenAIRE
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