The effect of spawning salinity on eggs of spotted seatrout (Cynoscion nebulosus, Cuvier) from two bays with historically different salinity regimes

dc.acquisition-srcDownloaded from-Web of Scienceen_US
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dc.contributor.authorKucera CJen_US
dc.contributor.authorFaulk CKen_US
dc.contributor.authorHolt GJen_US
dc.contributor.otherJournal of Experimental Marine Biology and Ecologyen_US
dc.date.accessioned2010-02-15T17:17:02Z
dc.date.available2010-02-15T17:17:02Z
dc.date.issued2002 Jun 24en_US
dc.degreeen_US
dc.description147-158en_US
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dc.description.abstractSpotted seatrout are capable of spawning in a wide range of salinities. Along the Texas Gulf Coast, bay salinities increase from an average of 14 ppt in Galveston Bay to an average of 40 ppt in Lower Laguna Madre due to the negative gradient of freshwater inflow from north to south. Tagging studies have shown that the majority of spotted seatrout do not migrate between adjacent bay systems. Spawning salinity has been shown to affect many properties of eggs including the diameter and salinity of neutral buoyancy. Spotted seatrout from two historically different salinity regimes (Matagorda Bay (MB) and Upper Laguna Madre (ULM)) were kept in the laboratory and induced to spawn in three salinities: 20, 30, and 40 ppt, The purpose of this study was to evaluate eggs at each of the three salinities and between the two bay systems. Two-way ANOVA showed a significant effect on the egg diameter of bay and spawning salinity, and a significant interaction between bays and spawning salinity. No significant difference in size at hatch was found between spawning salinities or between bays. Hatch rates in spawning salinity were > 90% in all cases. Regression of wet weight on spawning salinity was highly significant for both bays. Eggs spawned in 20 ppt have the largest wet weight and eggs spawned in 40 ppt have the smallest wet weight, irrespective of parental bay origin. Percentage of water varied between 92% for 20 ppt spawned eggs and 86% in 40 ppt spawned eggs. Neutral Buoyancy Salinity (NBS) of eggs increased with increasing spawning salinity. Eggs spawned by the Upper Laguna Madre fish held at 20 ppt were not positively buoyant at 20 ppt. The results of this study suggest that spotted seatrout are locally adapted to the prevailing salinity regime within an estuary. (C) 2002 Elsevier Science B.V All rights reserveden_US
dc.description.urihttp://gbic.tamug.edu/request.htmen_US
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dc.identifier.urihttp://hdl.handle.net/1969.3/23435
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dc.notesTimes Cited: 1ArticleEnglishHolt, G. JUniv Texas, Inst Marine Sci, Fisheries & Mariculture Lab, 750 Channelview Dr, Port Aransas, TX 78373 USACited References Count: 30566GLPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSAMSTERDAMen_US
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dc.relation.ispartofseries51081.00en_US
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dc.subjectCynoscion nebulosusen_US
dc.subjectegg diameteren_US
dc.subjectLaguna Madreen_US
dc.subjectneutral buoyancyen_US
dc.subjectwet weighten_US
dc.subjectCOD GADUS-MORHUAen_US
dc.subjectred drumen_US
dc.subjectBUOYANCYen_US
dc.subjectSEAen_US
dc.subjectLARVAEen_US
dc.subjectWATERen_US
dc.subjectTEXASen_US
dc.titleThe effect of spawning salinity on eggs of spotted seatrout (Cynoscion nebulosus, Cuvier) from two bays with historically different salinity regimesen_US
dc.typeJournalen_US
dc.universityen_US
dc.vol-issue272(2)en_US
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