Mississippi River sustenance of brown shrimp (Farfantepenaeus aztecus) in Louisiana coastal waters

Fry, Brian (2011) Mississippi River sustenance of brown shrimp (Farfantepenaeus aztecus) in Louisiana coastal waters. Fishery Bulletin, 109(2), pp. 147-161.

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Abstract

Brown shrimp (Farfantepenaeus aztecus) are abundant along the Louisiana coast, a coastline that is heavily influenced by one of the world’s largest rivers, the Mississippi River. Stable carbon, nitrogen, and sulfur (CNS) isotopes of shrimp and their proventriculus (stomach) contents were assayed to trace riverine support of estuarine-dependent brown shrimp. Extensive inshore and of fshore collections were made in the Louisiana coastal zone during 1999–2006 to document shrimp movement patterns across the bay and shelf region. Results showed an unexpectedly strong role for nursery areas in the river delta in supporting the offshore fishery, with about 46% of immigrants to offshore regions arriving from riverine marshes. Strong river influences also were evident offshore, where cluster analysis of combined CNS isotope data showed three regional station groups related to river inputs. Two nearer-river mid-shelf station groups showed isotope values indicating river fertilization and productivity responses in the benthic shrimp food web, and a deeper offshore station group to the south and west showed much less river inf luence. At several mid-shelf stations where hypoxia is common, shrimp were anomalously 15N depleted versus their diets, and this d15N difference or mismatch may be useful in monitoring shrimp movement responses to hypoxia.

Item Type: Article
Title: Mississippi River sustenance of brown shrimp (Farfantepenaeus aztecus) in Louisiana coastal waters
Personal Creator/Author:
CreatorsEmail
Fry, Brian
Refereed: Yes
Journal or Publication Title: Fishery Bulletin
Volume: 109
Number: 2
Page Range: pp. 147-161
Date: 2011
ISSN: 0090-0656
Issuing Agency: United States National Marine Fisheries Service
Subjects: Biology
Ecology
Fisheries
Item ID: 8713
Depositing User: Patti M. Marraro
Date Deposited: 07 Jun 2012 14:53
Last Modified: 07 Jun 2012 14:53
URI: http://aquaticcommons.org/id/eprint/8713

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