In:
Journal of the World Aquaculture Society, Wiley, Vol. 38, No. 3 ( 2007-09), p. 367-382
Abstract:
The effects of different densities of caged Nile tilapia, Oreochromis niloticus , on water quality, phytoplankton populations, prawn, and total pond production were evaluated in freshwater prawn, Macrobrachium rosenbergii , production ponds. The experiment consisted of three treatments with three 0.04‐ha replicates each. All ponds were stocked with graded, nursed juvenile prawn (0.9 ± 0.6 g) at 69,000/ha. Control (CTL) ponds contained only prawns. Low‐density polyculture (LDP) ponds also contained two cages (1 m 3 ; 100 fish/cage) of monosex male tilapia (115.6 ± 22 g), and high‐density polyculture (HDP) ponds had four cages. Total culture period was 106 d for tilapia and 114 d for prawn. Overall mean afternoon pH level was significantly lower ( P ≤ 0.05) in polyculture ponds than in CTL ponds but did not differ ( P 〉 0.05) between LDP and HDP. Phytoplankton biovolume was reduced in polyculture treatments. Tilapia in the LDP treatment had significantly higher ( P ≤ 0.05) harvest weights than in the HDP treatment. Prawn weights were higher ( P ≤ 0.05) in polyculture than prawn monoculture. These data indicate that a caged tilapia/freshwater prawn polyculture system may provide pH control while maximizing pond resources in temperate areas.
Type of Medium:
Online Resource
ISSN:
0893-8849
,
1749-7345
DOI:
10.1111/jwas.2007.38.issue-3
DOI:
10.1111/j.1749-7345.2007.00109.x
Language:
English
Publisher:
Wiley
Publication Date:
2007
detail.hit.zdb_id:
2233509-2
SSG:
21,3
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