Culture-based fisheries in small reservoirs in northern Vietnam: effect of stocking densities and species combinations

Nguyen, Hai Son, Bui, Anh T., Nguyen, Dieu Q., Truong, Dung Q., Le, Luu Thanh, Abery, Nigel W. and De Silva, Sena 2005, Culture-based fisheries in small reservoirs in northern Vietnam: effect of stocking densities and species combinations, Aquaculture research, vol. 36, no. 11, pp. 1037-1048, doi: 10.1111/j.1365-2109.2005.01312.x.

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Title Culture-based fisheries in small reservoirs in northern Vietnam: effect of stocking densities and species combinations
Author(s) Nguyen, Hai Son
Bui, Anh T.
Nguyen, Dieu Q.
Truong, Dung Q.
Le, Luu Thanh
Abery, Nigel W.
De Silva, SenaORCID iD for De Silva, Sena
Journal name Aquaculture research
Volume number 36
Issue number 11
Start page 1037
End page 1048
Publisher Blackwell Publishing Ltd
Place of publication Chichester, England
Publication date 2005
ISSN 1355-557X
Keyword(s) cost-benefit
culture-based fisheries
species ratio
stocking efficiency
Summary This study was conducted in 20 reservoirs, ranging in size from 4 to 30 ha, in the mountainous, northern region of Vietnam, in ThaiNguyen and YenBai provinces, over two growth cycles in 2002/03 and 2003/04. The reservoirs are leased by farmers for fishery activities from the provincial administration, and the trials were managed by the lessee farmers. Three species combinations in ratios (by fingerling weight) of grass carp: silver carp: bighead carp: common carp: mrigal 1:2:1:1:3 (A), 1:3:1:1:2 (B) and 1:2:1:1:2 (C) were used as seed stock. The overall mean yield of stocked fish in 2002/03 and 2003/04 growth cycles in reservoirs in ThaiNguyen and YenBai provinces was 165 (±21) and 190 (39), and 287 (±22) and 325 (±24) kg ha−1 respectively. The yield in reservoirs in both provinces, in both growth cycles and irrespective of the species combinations, increased in relation to stocking density. In reservoirs in ThaiNguyen Province, the species combination B gave the lowest yield (both growth cycles and overall), and differed significantly (P<0.05) from combinations A and C. The stocking efficiency (ratio of the yield of stocked fish in kg ha−1 to the weight of the stocked fish in kg ha−1) in reservoirs in ThaiNguyen Province ranged from 2.9 to 5.1 over the two growth cycles and that in YenBai from 2.8 to 3.9. There was no discernible trend between growth cycles and/or between species combinations. The major cost incurred was for fingerling procurement. In all instances, a net profit was accrued. The mean (±standard error (SE)) net profit ha−1 (in 103VN dong; approximately 15 500 VND=1 US$) was 885 (±270) and 864 (±214), and 1322 (±176) and 1600 (±150) for the growth cycles 2002/03 and 2003/04 for reservoirs in ThaiNguyen and YenBai provinces respectively. Between the two growth cycles, the net profit increased in eight and three reservoirs from YenBai and ThaiNguyen, respectively, the maximum increase being recorded in Khuan Gio (165%) and Dong Man (39%) reservoirs.
Language eng
DOI 10.1111/j.1365-2109.2005.01312.x
Field of Research 070401 Aquaculture
Socio Economic Objective 970107 Expanding Knowledge in the Agricultural and Veterinary Sciences
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2005, Blackwell Publishing Ltd.
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