Biological Sampling within the Pontchartrain Basin with Emphasis on Bonnet Carre’ Spillway Opening
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Biological Sampling within the Pontchartrain Basin with Emphasis on Bonnet Carre’ Spillway Opening. Brian Lezina Louisiana Department of Wildlife and Fisheries. Louisiana Department of Wildlife and Fisheries Office of Fisheries - Marine Fisheries resource monitoring

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Biological Sampling within the Pontchartrain Basin with Emphasis on Bonnet Carre’ Spillway Opening

Brian Lezina

Louisiana Department of Wildlife and Fisheries


Louisiana Department of Wildlife and Fisheries Emphasis on Bonnet Carre’ Spillway Opening

Office of Fisheries

- Marine Fisheries

resource monitoring

- Inland Fisheries

resource monitoring, protected and invasive species

- University of New Orleans

resource monitoring


Ldwf marine uno fisheries independent
LDWF Marine / UNO Emphasis on Bonnet Carre’ Spillway OpeningFisheries Independent

  • Long-term data set

  • Fixed stations

  • Sampling frequency increased and new stations added for Bonnet Carre’

  • Trawls, finfish nets, oyster dredges

  • Weekly samples scheduled to last at least through June

  • Majority of the stations will remain weekly into July


Ldwf marine fisheries dependent
LDWF Marine Emphasis on Bonnet Carre’ Spillway OpeningFisheries Dependent

  • Recreational surveys

    • MRFSS Program

    • Shrimp surveys

  • On-water commercial surveys

    • Oyster fishery

    • Crab effort

  • Trip Ticket Program

    • Started 1999

    • Information such as landings, location, and effort


LDWF Marine Fisheries / UNO Nekton Emphasis on Bonnet Carre’ Spillway Opening


Ldwf inland fisheries
LDWF Inland Fisheries Emphasis on Bonnet Carre’ Spillway Opening

  • Routine sampling in basin rivers

  • Directed sampling within Bonnet Carre’

  • Assisting USACE with sturgeon translocation

  • Observation / outreach concerning invasives


What we have seen
What We Have Seen Emphasis on Bonnet Carre’ Spillway Opening

  • Sporadic shifts of larger saltwater species with fresh water (like spotted seatrout and crab)

  • Some movement of recreational anglers

  • Several species in sub-optimal habitats, esp. brown shrimp and oysters

  • No large scale changes in assemblages


What we are watching
What We Are Watching Emphasis on Bonnet Carre’ Spillway Opening

  • Finfish populations and fisheries

  • Oyster resources and fishery

  • Crustacean populations and fisheries

  • Dissolved Oxygen

  • Invasive species

  • Multiple sources of freshwater input

    • Bonnet Carre’

    • Mississippi River

    • Pearl River and Northshore rivers


Louisiana department of natural resources
Louisiana Department of Natural Resources Emphasis on Bonnet Carre’ Spillway Opening

  • Coast-wide Reference Monitoring System - Wetlands

    • emergent vegetation (marsh / forested wetlands)

    • Percent cover, dbh

    • sampled annually

  • Project Specific

    • emergent and submerged aquatics


Mississippi Department of Marine Resources Emphasis on Bonnet Carre’ Spillway Opening

  • Finfish and Invertebrate Monitoring

  • - 8 stations in western Mississippi Sound

  • initially weekly then monthly for several months after spillway closure (trawls)

  • abundance, distribution, species assemblage changes

  • Oyster Monitoring

  • - 7 stations in Mississippi Sound

  • - monthly sampling frequency

  • - oyster mortality, stress, and condition


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