James P. Clugston
K. J. Sulak
1998
<p><span id="_mce_caret" data-mce-bogus="1" data-mce-type="format-caret"><span>Egg sampling confirmed that </span><span class="single_highlight_class">Suwannee</span><span> </span><span class="single_highlight_class">River</span><span> </span><span class="single_highlight_class">Gulf</span><span> </span><span class="single_highlight_class">sturgeon</span><span> </span><i>Acipenser oxyrinchus desotoi</i><span>, a subspecies of Atlantic </span><span class="single_highlight_class">sturgeon</span><span> </span><i>A. o. oxyrinchus</i><span> use the same spawning site at </span><span class="single_highlight_class">river</span><span> kilometer (rkm) 215 from the mouth of the </span><span class="single_highlight_class">river</span><span> 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 </span><span class="single_highlight_class">Gulf</span><span> </span><span class="single_highlight_class">sturgeon</span><span>. Eggs were found only in the southern half of the </span><span class="single_highlight_class">river</span><span>, 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 diameter. Eggs were found predominantly in depths of 2–4 m at water temperatures of 17–21°C, conductivities of 50–100 μS, and dissolved oxygen levels exceeding 5.0 mg/L. The Cody Scarp, 15 rkm above the spawning ground, may mark the upstream limit of spawning areas in the </span><span class="single_highlight_class">river</span><span>. Three 2–4-month-old riverine juveniles (82–115 mm total length, TL) collected are the smallest yet captured from any </span><span class="single_highlight_class">river</span><span>. Data for 18 riverine age-0 juveniles (to 350 mm TL) suggest that this </span><span class="single_highlight_class">stage</span><span> lasts 6–10 months, terminating with migration of fish to the </span><span class="single_highlight_class">river</span><span> mouth in January–February. Less than 2% of 461 juveniles captured at the estuarine </span><span class="single_highlight_class">river</span><span> mouth (1990–1993) were under 350 mm TL. Riverine age-0 fish were collected over long shallow stretches (typically <4 m deep) of relatively barren sand (rkm 12–238).</span></span></p>
application/pdf
10.1577/1548-8659(1998)127<0758:ELHSOG>2.0.CO;2
en
Taylor & Francis
Early life history stages of Gulf sturgeon in the Suwannee River, Florida
article