Early Life History Stages of Gulf Sturgeon in the Suwannee River, Florida
| Autor: | Kenneth J. Sulak, James P. Clugston |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
geography
geography.geographical_feature_category biology Ecology Gulf sturgeon Range (biology) Bedrock Aquatic Science Seasonality biology.organism_classification medicine.disease Fecundity Substrate (marine biology) Fishery medicine Acipenser Ecology Evolution Behavior and Systematics Geology Atlantic sturgeon |
| Zdroj: | Transactions of the American Fisheries Society. 127:758-771 |
| ISSN: | 1548-8659 0002-8487 |
| Popis: | Egg sampling confirmed that Suwannee River Gulf sturgeon Acipenser oxyrinchus desotoi, a subspecies of Atlantic sturgeon A. o. oxyrinchus use the same spawning site at river kilometer (rkm) 215 from the mouth of the river each year. Forty-nine eggs were recorded in 1995, and 368 were recorded in 1996. Spawning began 4–7 d after the March new moon in both years and lasted 10–11 d; in 1996, a second 10-d spawning round began on the April new moon. Developmental synchrony among eggs recovered suggested several discrete spawning events in both years. Total eggs deposited for three 1996 sampling days was estimated as 405,600–711,000/d, approximating the fecundity range of a large female Gulf sturgeon. Eggs were found only in the southern half of the river, an area with surface currents of 0.5–1.5 m/s and numerous eddies producing reverse bottom currents of 0.1–0.5 m/s. Egg substrate consisted of bedrock limestone thinly overlain by fine sand and densely distributed elliptical gravel 2–10 cm in diamete... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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