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The effect of different periods of aestivation on recovery and nutritional composition of Apple snail (Pomacea sp.)
(2025-07-01)
Srijad, S.
;
Sang-In, V.
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Pilapang, K.
;
Yomla, R.
The results showed a 100% recovery of all experimental groups. The survival rate of aestivation groups (2 weeks, 4 weeks, and 8 weeks) showed a significant difference, and the survival rate was 94.78±4.50, 90.82±3.11, and 88.78±2.86 percent, respectively. The average weight at the end of the experiment was 19.3±1.2, 15.1±3.7, 15.4±3. 6 and 13.8±2.9 g, respectively, which were not significantly different (P>0.05). The nutritional composition after aestivation showed a significant difference (P<0.05) in protein values among the groups. The protein value was 47.53±0.44, 51.17±0.53, 52.88±0.18, and 53.95±0.24 percent, respectively. The protein values showed an increasing trend over the aestivation period, while the fat was between 2.1-2.4 percent, and fiber was between 0.3-0.4 percent were not significantly different (P>0.05). The percentage of ash was significantly different (P<0.05), with values ranging from 17.0 to 19.4. It was shown that higher ash percentages were observed in the 4-week and 8-week groups. The percentages of NFE with values ranging from 24.1 to 33.1. Meanwhile, NFE percentages were higher in the control group and showed a decreasing trend over the study period. The percentage of calcium was significantly different (P>0.05), with values ranging from 5.6-6.7, while the percentage of phosphorus was about 0.6 percent, which was not statistically different (P>0.05). The survival rate trend of apple snails decreased with increasing aestivation period. Similarly, the body weight and NFE values decreased, but the body protein level increased.
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Efficacy of mangosteen (Garcinia mangostana) peel hot water extract against Aeromonas hydrophila infection of seabass fingerling (Lates calcarifer)
(2024-01-01)
Thiankham, S.
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Thonghuatoei, W.
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Kantha, P.
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Yomla, R.
;
Kitikiew, S.
The mangosteen (Garcinia mangostana Linn.) peel hot-water extract (MPE) is proved to be antibacterial potential of seabass fingerling (Lates calcarifer) rearing in freshwater which infected by Aeromonas hydrophila. In vitro study, Minimal Inhibitory Concentration (MIC) of MPE was 25 ppm and the Minimal Bactericidal Concentration (MBC) was 25 ppm. For In vivo, fingerlings were immersed in different concentrations of MPE by 0 ppm (Control), 20 ppm, 40 ppm, and 60 ppm respectively for 7 days with A. hydrophila concentration of 10<sup>8</sup> CFU mL<sup>-1</sup>. The results showed that the group which received MPE were higher survival rate compare with control group. Hematological parameters revealed that the group that received MPE had significantly increased levels of red blood cells (RBC), white blood cells (WBC), and hemoglobin concentration (Hb) than control group. Moreover, the water quality parameters were not significantly different except ammonia concentration, at 60 ppm MPE concentration of ammonia was the lowest. All results can imply that the MPE is able to improve the antibacterial potential and culture potential for seabass fingerlings.
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The effect of Moina sp. immersion with 17alpha-methyl testosterone (17MT) on growth performances and sex reversal of Nile tilapia
(2023-07-01)
Pilapang, K.
;
Srijad, S.
;
Yomla, R.
The results found that Moina sp. immersion with 17alpha-methyl testosterone (17MT) has a non-effect on the growth performances and non-effect on the sex reversal of Nile tilapia. The higher length, weight, and specific growth rate were found in the PC (PC: 60 mg17MT/kg mixing commercial feed) and the NC (only commercial feed without 17MT) than in other groups (50 and 100 mg17MT/l immersing Moina sp.). The length and the weight of the PC and NC groups showed no significant difference. But these groups were different from the groups of 50 and 100 mg/l. The average length of the PC, NC, 50, and 100 mg/l were displayed at 2.67±0.08, 2.86±0.17, 1.45±0.07 and 1.46±0.02 cm, respectively. The average weight of the PC, NC, 50, and 100 mg/l was displayed as 0.40±0.07, 0.51±0.08, 0.08±0.10 and 0.07±0.01 g, respectively. The highest specific growth rate was found in the NC group (2.37±0.00%). The survival rate of the NC group was not significantly different from other groups. 17MT does not affect growth performances in the larval stage. However, dried Moina sp. immersion in 17MT could be caused an effect on growth performances and sex reversal.
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Knowledge, attitudes, and adoption process towards innovative agricultural food production with aquaponics for communities with limited spaces in urban Bangkok, Thailand
(2023-07-01)
Simakorn, S.
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Suwanmaneepong, S.
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Cavite, H. J.M.
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Yomla, R.
The study found that household respondents have positive attitudes towards the Golden Apple Snail-Vegetable/Herb (GASVH) aquaponics innovation. Results implied that urban households were open to constant exploration of how the innovation would give better livelihood and income opportunities. Furthermore, the adoption acceptance survey revealed that household respondents generally have high-level ratings at each stage of the adoption process. This finding indicates respondents' positive knowledge and attitude toward an enhanced innovation adoption of GASVH aquaponics. It is recommended that GASVH aquaponics innovation be promoted particularly to urban households, as this can help to address food security and safety issues in urban areas. Urban families generally had high knowledge and positive attitudes towards technology which it is promising innovation for adoption.
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Effects of commercial feed, mulberry leaves, and mixed feed on growth in apple snails (Pomacea sp.)
(2023-03-01)
Srijad, S.
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Pilapang, K.
;
Dimak, J.
;
Yomla, R.
This study determined the effects of different feeds on the growth performances of apple snails by using three treatments (commercial feed: CF, mulberry leaves: ML, and mixed feed: MF (commercial feed mixed with mulberry leaves). Apple snails at the age of four-five weeks were an average weight of 0.09 g/snail. These were reared in the CS which managed water circulation twice a day (one-hour morning-evening) and fed feed once an evening-day for 6 weeks. The results showed that the average weight of apple snails (Pomacea sp.) in a closed system (CS) were significantly differed (P<0.05). The highest average weight was found in the MF with 4.3+0.4 g/snail. The CF and ML groups were displayed as 2.5+0.2, and 1.8+0.1 g/snail, respectively. The average length (mm/snail) of the MF group was significantly differed (P<0.05) in the ML and CF groups. These were 23.38±1.13, 24.07±1.14, and 28.12±1.59 of average length (mm/snail) in the ML, the CF, and the MF groups, respectively. The survival rate of apple snails in the CF (91.6±5.0%), ML (99.4±0.7%), and MF (94.5±6.1%) groups was significantly differed (P<0.05) among the ML and the CF groups. The lower FCR was found at 1.16 in the CF group which significantly differed when compared to the ML (1.34) and the MF (1.34) groups. Nutrient contents (protein, fat, fiber, ash, nitrogen-free extract (NFE), calcium, and phosphorus content) were significant differences (P<0.05). The highest protein content and lowest fat content of dried weight found in the ML group were 54.3±0.06% and 3.45±0.18 % respectively. These findings indicated that the easy way to culture apple snails using the commercial feed, and the alternative way to rear apple snails could be used appreciative feeds.
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Study on different concentrations and timings of 17α-methyltestosterone to accumulate in water flea (Moina spp.) from lab-scale
(2022-01-01)
Pilapang, K.
;
Dandrit, D.
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Yomla, R.
The different concentrations and immersion times of 17α-methyltestosterone (17MT) on the accumulation in water flea were investigated. Results were found that amount of 17MT of both groups in each period displayed significantly different (P <0.05) when compared to the control. The highest accumulation of 17MT was found at the concentration of 100 mg / L for 420 minutes equal to 0.46 ±0.10 mg/L. In contrast, it was found that the amount of 17MT in both concentrations of water at three times was not statistically significant (P> 0.05)in each treatment. Therefore, results indicated that the accumulation of 17MT in water fleas can be applied for using accumulated water flea to produce male tilapia.

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