Theses and Dissertations


Title: INFLUENCE OF NURSERY AND FEED MANAGEMENT ON POND PRODUCTION OF Litopenaeus vannamei

Name: Garza de Yta, Antonio

Degree: MS

Chair: Rouse, D.

Resides: SFAA

University: Auburn University

Location: Gulf Shores, Alabama

Date: 2001

Pages: 59

Keywords: feeding, nursery management, ponds, pacific white shrimp, vannamei, production

Abstract:

Between June 2000 and October 2000, a study was performed to determine the effects of
nursery and feed management on the growth, survival, and food conversion ratio of
Litopenaeus vannamei in culture ponds. Experiments were conducted in sixteen 0.1 05-ha
experimental ponds at the Claude Peteet Mariculture Center in Gulf Shores, Alabama.
All experimental ponds were lined with a high-density polymer and contained- a layer of
native soil.
Shrimp were received from a commercial hatchery in Texas. After acclimation, three
ponds were stocked with PL10, while the remaining PL's were placed in six 4.3-m3
fiberglass nursery tanks. Postlarvae were kept in the nursery for 1 0 and 20 days before
being transferred into production ponds. Ten ponds were stocked with PL20, and three
were stocked with PL3o. Although only five of the ponds stocked with PL20 were used to
determine the effects of nurseries on growth and survival, an additional five ponds were
needed to evaluate the effects of feed management on growth and food conversion ratio.
These five ponds were fed according to commercial feeding tables with adjustments
made from feeding tray data. All other ponds were fed using a fixed feed conversion
ratio (FCR) of 1.6. Average growth and survival from the previous two weeks was used
to predict future growth. Shrimp were fed twice daily with a 35% protein shrimp feed.
All ponds were stocked at a density of 35 PLs/m2. Aeration was used when needed to
maintain adequate dissolved oxygen.
Results for the nursery study indicate that survival during the growout period was higher
for shrimp that were nursed for 10 or 20 days, although the overall survivals were lower
when the mortalities at the nursery stage were included. Average growth, survival, yields
and FCR were similar between treatments. During the feed management study, survival
and yield were significantly higher in ponds that used standard feed tables and feed trays
(P<0.05). Growth and FCR had no difference in this study. Although the results of this
experiment are not conclusive, further research should explore additional methods to
improve survival growth and FCR of cultured marine shrimp.

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