Theses and Dissertations


Title: Effects of Water Recycling on Water Quality and Bottom Soil in Shrimp Ponds

Name: Zelaya, Oscar

Degree: MS

Chair: Claud E. Boyd

Resides:

University: Auburn University

Location: Auburn, Alabama

Date: 2001

Pages: 43

Keywords: pond management,water quality,shrimp culture,water exchange

Abstract:

This study evaluated changes in chemical characteristics of production pond water, soils and shrimp yields in response to water recycling through an oxidation pond. Nine 0.1-ha ponds were stocked with Litopenaeus vannamei post larvae. Three ponds were stocked with a high density of shrimp (50/m2), three were stocked with a low density of shrimp (25/m2), and three others were stocked with a high density of shrimp and pond water was- recycled through an adjacent pond of equal volume not stocked with shrimp. The density of shrimp in low density and high density with recycling treatments was equal when based on the total water area of production and recycling ponds. Mean shrimp yields for low density (LD), high density (HD) and high density recycling ponds (HDR) were 1,706 kg/ha, 4,648 kg/ha and 4,534 kg/ha respectively. There was no significance difference (P > 0.05) in yields between HD and HDR treatments or between LD and HDR treatments when based on total water surface area. Mean harvest weights of individual shrimp ranged from 22 to 25 g and were not different (P > 0.05) among treatments.Recycling water from HDR ponds through an oxidation pond resulted in significant reductions in the mean mass weight of total nitrogen (TN) and total ammonia nitrogen (TAN) compared with HD ponds because HDR ponds used twice the water volume. The sum of the mean mass weight (kg) for water quality variables found in HDR ponds and oxidation ponds were significantly greater than the mean mass weight in HD ponds, except for nitrate-nitrogen (NO3-N), nitrite-nitrogen (NO2-N) and TAN. No differences were noted for water quality in HDR and LD ponds. No differences were observed among treatments for soil pH, concentrations of carbon, sulfur, nitrogen, soil respiration and phosphorus absorption capacity. We concluded that recycling of water from a production pond through an oxidation pond of equal volume had minimum to no effect on water quality and shrimp yields. The major operational disadvantages of recycling water were that pond space was put into non productive use as oxidation ponds, and 3.3 times more energy was used for aeration and water circulation. It would be better to stock two ponds at half the rate instead of doubling the volume of water per pond by recycling through an oxidation pond.

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