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The ability of an algicidal bacterium Marinobacter salsuginis strain BS2, isolated from shrimp pond water, to reduce shrimp mortality was investigated under laboratory conditions. When
two species of shrimp (Penaeus monodon and Litopenaeus vannamei) (body length 1.5–1.8 cm) were cultured together with the dinoflagellate Noctiluca scintillans, nearly 80 % of the shrimps died within 7 days. However, when bacterial strain BS2 was also added to the culture, N. scintillans was killed within 48 h, and shrimp survival rates on the 7th day improved from 23 to 87 % for both P. monodon and L. vannamei. The bacterium BS2 alone had no effect on shrimp condition. Under conditions of increased dissolved oxygen, the effect of
using BS2 was greater, and shrimp survival rates improved even more dramatically, from 26 to 98 %. These studies provide the
first evidence that the use of killing bacteria, isolated from shrimp culture water, can suppress harmful algal blooms (HABs)
and thus restore the efficiency of shrimp production. The control of HABs in this way in shrimp culture farms would be a major
benefit for shrimp production. 相似文献
2.
Keawtawee Teeyaporn Fukami Kimio Songsangjinda Putth Muangyao Pensri 《Fisheries Science》2011,77(4):657-664
To control harmful algal blooms (HABs), in particular dinoflagellate Noctiluca scintillans, which causes damage to shrimp production, algicidal bacteria were isolated from shrimp pond water and screened for their
killing effect against N. scintillans under laboratory condition. Among 260 bacterial isolates, 10 showed killing effects on N. scintillans. Out of 5 strains showing relatively stronger killing activity, 4 strains belonged to the Gammaproteobacteria group. Among
these, strain BS2 (identified as Marinobacteria salsuginis) showed the strongest Noctiluca-killing activity. In the present study, we also investigated bacterial effects against growth of other phytoplankton species.
Strain BS2 killed only N. scintillans but not any other phytoplankton (Heterosigma akashiwo NIES-6, Chatonella antique NIES-1, Chaetoceros ceratosporum, Prorocentrum lima, and Dunaliella sp.). Results of the present study lead us to expect prevention of damage by HABs, in particular dinoflagellate N. scintillans, in shrimp farming and mitigation for shrimp production in ponds using Noctiluca-killing bacteria. 相似文献
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Dirk Erler Putth Songsangjinda Teeyaporn Keawtawee Kanit Chaiyakam 《Aquaculture International》2007,15(1):55-66
Rural shrimp farmers in Thailand are being encouraged to adopt practices that will reduce the quantity and improve the quality
of their effluent. A simple and cheap option for small-scale shrimp farmers is to use settlement ponds to store and remediate
discharge water before being re-used. We undertook a detailed study of the settlement ponds in a small-scale commercial black
tiger shrimp farm typical of rural Thailand. We found that over a 9-week period, following the harvest of one of the two farm
production ponds, total nitrogen (TN) concentrations in the water column were reduced by 30%, with the greatest removal (56%)
occurring during the fifth week. There was a 10% increase in dissolved organic nitrogen (DON) concentrations during the trial.
Sediments were a source of total ammonia nitrogen (TAN), and the re-mineralisation rate was the highest in the first two settlement
ponds. Coconut fronds added to two of the four settlement ponds to increase the surface area available for microbial activity
were found to provide a site for microbial re-mineralisation of TAN, the photosynthetic uptake of TAN and oxidised nitrogen
(NO
x
) and nitrification. The water column was a net assimilator of TAN through autotrophic uptake. This study has shown that settlement
ponds are capable of reducing water column N concentrations; however, sediment must be managed to reduce re-mineralisation
during successive cropping cycles. In addition, coconut fronds were shown to improve N removal, although they should be periodically
removed to maintain efficiency. 相似文献
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