Recruitment of oysters in Mobile Bay Sean Powers, Kyeong Park, C-K Kim, Jason Herrmann, and Ben LaCour UNIVERSITY OF SOUTH ALABAMA DAUPHIN ISLAND SEA LAB.

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Presentation transcript:

Recruitment of oysters in Mobile Bay Sean Powers, Kyeong Park, C-K Kim, Jason Herrmann, and Ben LaCour UNIVERSITY OF SOUTH ALABAMA DAUPHIN ISLAND SEA LAB Fisheries Habitat Program

Alabama Oyster Fishery Frederic (3) Opal (3)& Erin (2) Camille (5) Ethel (3) Elena (3) 50 yr average 0 200, , , ,000 1,000,000 1,200, Landings (kg meat) Fisheries Habitat Program

Habitat Availability: Alabama Oyster Habitat (1972) Live oyster reefBuried oyster shell deposits Fisheries Habitat Program

Habitat Assessment

Addressing Restoration Challenges Dissolved Oxygen Larval supply # spat m -2 d -1 (Hoese et al. 1972) Predation Fisheries Habitat Program

Oyster Recruitment: Survey 18 sites throughout Mobile Bay every three weeks for oyster settlement. Survey 18 sites throughout Mobile Bay every three weeks for oyster settlement. Jan 2006 – Dec 2007 Jan 2006 – Dec 2007 Synoptic measurements of larval supply via plankton pump samples. Synoptic measurements of larval supply via plankton pump samples. Discrete mark & recapture experiments for post- settlement mortality Discrete mark & recapture experiments for post- settlement mortality Validation of a 3-D biophysical transport model. Validation of a 3-D biophysical transport model. Fisheries Habitat Program

Spat Recruitment Methods Fisheries Habitat Program

Predation: Oyster Drills Fisheries Habitat Program

Comparison to Hoese et al sites, same locations in Concrete tile, same as Horizontal plate orientation 2-3 week deployments April-November Salinity and temperature ranges were similar Plates moored using fixed pilings

Hoese et al. 1972: Spatial Pattern # spat m -2 d -1 (Hoese et al. 1972)

Spat/m2/day CR11CR12CR13 Larvae/1000L μ Larvae/1000L μ

CR15CR16 Spat/m2/day Larvae/1000L μ Larvae/1000 l μ CR14

Transport Transport Model

Post-settlement Mortality Mark & recapture experiments with newly settled larvae 7-11 mm SH set on concrete tiles by the Auburn Hatchery. Experiments conducted for 5- 7 days. Miss. Sound Middle Bay Bon Secour Cedar Pt. Dauphin Island

Average by region Summer 2007 ab b a b b Bon SecourCedar PointDauphin IslandMiddle BayMississippi Sound Portion of Spat Mortality/Day

Implications for Restoration Further support for high success of reefs in western portion of the study area. Fisheries enhancement should focus attention in these areas. Possibility for spawning sanctuaries in Bon Secour Bay. High retention possible Low post-settlement mortality

Sanctuary positioning Results of the Park and Kim biophysical transport model indicating concentrations of dye released at Shellbank (upper panel) after 6 days and Fish River Reef after 10 days. Release location is indicated by the red star.

Acknowledgements Tech Support, boat time, fishing volunteers and graduate students