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Now showing items 21-30 of 33
Bacterial microbiota of eggs from cage-reared and tank-reared grouper, Epinephelus coioides
(European Association of Fish Pathologists, 2004)
At SEAFDEC AQD, opaque spawned grouper eggs are observed during collection in cage-reared brood stock; while opaque and multi-colored eggs are often observed in tank-reared fishes. This study aimed to investigate the ...
Effect of iodine disinfection on the bacterial flora and hatching rate of grouper, Epinephelus coioides eggs at the cleavage and eyed stages
(European Association of Fish Pathologists, 2001)
In this study, the effect of iodine disinfection on the bacterial flora and hatching rate of grouper egg at two different stages of development were investigated. The eggs (at cleavage and eyed stages) were soaked for 10 ...
Level and percentage recovery of resistance to oxytetracycline and oxolinic acid of bacteria from shrimp ponds
(Elsevier, 2002)
The bacterial level of the water, sediment and cultured shrimp (Penaeus monodon) from different ponds were determined using a general medium, a presumptive Vibrio medium and a presumptive Pseudomonas–Aeromonas medium. ...
Bamboo back disease in tiger shrimp, Penaeus monodon
(European Association of Fish Pathologists, 2002)
This report describes bamboo back disease affecting Penaeus monodon in the Philippines. Affected and normal shrimps were processed for bacterial isolation and histopathology. Morphological changes in the external anatomy ...
Effects of Gusathion A on the survival and shell quality of juvenile Penaeus monodon
(Elsevier, 1991)
Juvenile Penaeus monodon (body weight=10–20 g) were exposed to a commonly used organophosphate pesticide, Gusathion A, in ponds for 96 h. Prawns exposed to 1.5–150 ppb Gusathion A had 27–53% shell softening, with a 96 h ...
Vibrio harveyi isolated from cage-cultured seabass Lates calcarifer Bloch in the Philippines
(Blackwell Publishing, 2002)
WSSV risk factors related to water physico-chemical properties and microflora in semi-intensive Penaeus monodon culture ponds in the Philippines
(Elsevier, 2010)
Whitespot syndrome virus, WSSV, is the most important among the shrimp diseases. One of the suggested WSSV risk factors is the occurrence of stress since stressors could compromise the shrimp defence system thus increasing ...
The first report of Vibrio harveyi infection in the sea horse Hippocampus kuda Bleekers 1852 in the Philippines
(Blackwell Publishing, 2004)
Accumulation and depletion of oxytetracycline (OTC) and oxolinic acid (OXA) in Pompano, Trachinotus blochii
(European Association of Fish Pathologists, 2022-09-03)
Accumulation and depletion including withdrawal period for oxytetracycline (OTC) and oxolinic acid (OXA) in pompano (<i>Trachinotus blochii</i>) were determined following oral administration. Pompano were cultured in 250-L ...
Lime application to condition soil to pH 11 controls growth of harmful vibrios and WSSV
(European Association of Fish Pathologists, 2023-05-26)
Shrimp farming has been devastated by several diseases. Disease outbreaks can be prevented by optimising environmental conditions or by eliminating risks factors including carrier organisms. These can be achieved through proper pond preparation. One important step in pond preparation is the application of hydrated lime.
This paper describes the effect of hydrated lime application to condition pond soil to pH 11 on the pond ecosystem, more specifically on soil pH and biota. The experiment was done using three 600 m<sup>2</sup> brackish water ponds. After hydrated lime application, the wet soil pH on the 1<sup>st</sup>-8<sup>th</sup> day was significantly higher (P<0.05) compared to the pH before liming to pH 11, and flushing after flooding for 24 h. Soil pH of 11 was observed 24-48h after lime application. Moreover, unwanted species like crabs and fish were found dead. Liming to pH 11 negatively affects the counts of green vibrio colonies thereby decreasing the percentage of green vibrios (PGV). In another experiment, three 750m<sup>2</sup> earthen ponds were used. The pond soils were previously positive for the Whitespot Syndrome Virus (WSSV), hydrated lime were applied to bring the pond soil pH to 11. After lime application, WSSV was not detected in the pond soils.
Results showed that increasing the soil pH to ≥11 positively affects the pond ecosystem. Liming encourages the proliferation of yellow vibrios and the eradication of carrier species (i.e. crabs) as well as predators (i.e. fish) in the ponds. Furthermore, liming to pH 11 may also eradicate White spot virus from the pond sediment. To implement a 1-unit increase in wet pH, hydrated lime should be applied at 2T/ha....