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- W2102249968 abstract "The larvae of six species of Sciaenidae were collected in continental shelf waters off west Louisiana on five midmonthly ichthyoplankton cruises from December 1981 to April 1982. Ranked in order of abundance these species were sand seatrout, Cynoscion arenarius: Atlantic croaker, Micropogonias undulatus: spot. Leiostomus xanthurus; black drum, Pogonias cromis; southern kingfish, Menticir· rhus americanus;and banded drum. Larimusfasciatus. Total larva density was highest in April, and the high densities were associated with the coastal boundary layer, a horizontal density front caused by an intrusion offresher water onto the inner shelf that probably issued from the Atchafalaya River east of the study area. Spawning by sand seatrout began in January. two months earlier than previously reported, and first occurred offsbore of midshelf but moved shoreward as the season progressed. Analysis of length-frequency data suggest that spot probably began to spawn in Novem ber, one month earlier than once thought. Both sand seatrout and Atlantic croaker larvae were captured at higher rates at night than during the daytime. Sand seatrout larvae appear to be somewhat surface oriented while spot may undergo vertical migration. Interpretation ofthe sciaenid data support a previously developed transport hypothesis involving gulf menhaden larvae and west northwest alongshore advection within and just outside of a horizontally stratified coastal boundary layer. Members of the perciform family Sciaenidae are an important sport and commercial fishery re source along the United States coast ofthe Gulfof Mexico and are perhaps the most prominent group of northern Gulf inshore fishes. Sciaenids exceed all other families in numbers of species 1181 and in numbers of individuals or biomass; they are among the top four families with Mugili dae, Engraulidae, and Clupeidae (Gunter 1938, 1945; Moore et al. 1970; Franks et al. 1972; Hoese and Moore 19771. Of the six species of sciaenids captured during this study, only the banded drum, Larimus fasciatus. is not commonly sought by both sport and commercial fishermen. Many of Louisiana's sciaenids spawn in coastal or offshore waters. They have pelagic eggs and young which are then transported into estuaries (Johnson 1978 for reviewl. The seasonal impor tance ofLouisiana's estuaries as nursery grounds" @default.
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- W2102249968 date "1988-01-01" @default.
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- W2102249968 title "Distribution, abundance, and transport of larval sciaenids collected during winter and early spring from the continental shelf waters off west Louisiana" @default.
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