The effect of temperature on clove oil anesthesia in Nile tilapia (Oreochromis niloticus)


The effect of temperature on clove oil anesthesia in Nile tilapia (Oreochromis niloticus) Sirinnapa Poomjae and Sathit Boonnom ABSTRACT: The purpose of this study was to investigate the effect of temperature on anesthesia in Nile tilapia (10.51 ± 3.38 g, 8.56 ± 1.13 cm) with clove oil. Fingerlings were individually exposed to six different concentrations (25, 50, 75, 100, 125 and 150 mg/L) at two different temperatures (26 and 30 ºC). The induction and recovery times and water quality were examined to determine the lowest effective concentration. Fingerlings were individually subjected to the lowest effective concentration to evaluate the effect of temperature on the opercular movement. The concentration of 25 mg/L was inefficiency to induce the anesthesia at all temperatures. As the temperature and concentration increased, the induction time decreased (P < 0.05). Conversely, the recovery time decreased (P < 0.05) as the temperature increased and the recovery time increased (P < 0.05) with increasing concentration. In addition, the rising temperature declined (P < 0.05) the dissolved O2, whereas the dissolved O2 elevated (P < 0.05) with rising concentration. The lowest effective concentration at 26 and 30 ºC was indicated to be 100 and 75 mg/L, respectively. At these concentrations, the opercular movement rate was rose (P < 0.05) with increasing temperature. This study demonstrates that the temperature had an effect on the efficacy of clove oil as an anesthetic in Nile tilapia. Keywords: temperature, anesthetic, clove oil, Nile tilapia Source : https://ag2.kku.ac.th/kaj/PDF.cfm?filename=105_Fis291.pdf&id=3577&keeptrack=4
Administrator 2019-01-01

Effect of using soybean meal hydrolysate with pineapple juice in diet on growth performance, stress tolerance and disease resistance


Effect of using soybean meal hydrolysate with pineapple juice in diet on growth performance, stress tolerance and disease resistance Songsub Arungamol, Narawut Rapankum and Nopparat Patchanee ABSTRACT: Effect of using soybean hydrolysate through pineapple juice to replace fish meal in Nile tilapia on Growth performance stress tolerance and disease resistance. Soybean meal was digested with pineapple juice at 1:2 for 90 minutes and replaced with fish meal in diet formula. The experiment was assigned into 4 groups in each randomly by mixing soybean hydrolysate in diet at the rank of 0%, 25%, 50% and 75% which contained 31% protein and average energy level 284 kcal/100g. Tilapia with an average initial weight was 0.33 grams cultured for 45 days. The end of feeding experimental diet, fish were tested for tolerance to certain stress conditions by soaking 500 ppm formalin for 2 hours, 1.5 ppm of ammonia dissolved in water and the resistance to bacteria A. hydrophila. The results showed that fish fed with soybean meal digested with pineapple juice instead of fish meal at rate 0, 25 and 50% the effective growth were not different (P>0.05). In some stress tolerance tests by testing with formalin and ammonia indicated that accumulated mortality rate of experimental group using soybean hydrolysate in fish meal diet formula at the rate of 0 and 25% was lower than the fish meal replacement group at the rate 50 and 75% were significant (P0.05). It can be concluded that soybean hydrolysate can be digested with pineapple juice would be highly at 25% without affecting growth rate, stress tolerance and disease resistance. Keywords: Soybean meal hydrolysate, Nile tilapia, Stress tolerance test, Challenge Test   Source : https://ag2.kku.ac.th/kaj/PDF.cfm?filename=P98%20Fis28.pdf&id=3141&keeptrack=1
Administrator 2018-12-01

In vitro digestibility of corn cob with crude enzyme extract from gastrointestinal tract of Nile tilapia (Oreochromis niloticus) and cellulase crude extract from Trichoderma viride


In vitro digestibility of corn cob with crude enzyme extract from gastrointestinal tract of Nile tilapia (Oreochromis niloticus) and cellulase crude extract from Trichoderma viride Rungkan Klahan, Montri Punyatong and Khanchai Danmek ABSTRACT: The present study was investigated the optimal time and apparent digestibility coefficient of enzyme from Nile tilapia gastrointestinal tract and cellulase crude extract from Trichoderma viride for corncob digestion. The crude extract from 15 g Nile tilapia and cellulase from Trichoderma virdie were took to digest corn cob at 0, 60, 120, 180, 240, 300 and360 min.The results showed that the optimal time of crude extract from Nile tilapia digested corn cob that detected by the glucose content, percentage of dry matter, protein fiber and fat were 300,5, 360, 120 and 180 min, respectively.Moreover, the optimal time of cellulase from Trichoderma viride for corn cob digestion which detected by the percentage of dry matter and glucose content were 240 and 360 min, respectively. This study indicated that the optimal time for corn cob digestion of crude extract from Nile tilapia and cellulase from Trichoderma viride were 360 min. In addition, corn cob can be used as feedstuff for Nile tilapia diet. Keywords: Nile tilapia, Trichoderma viride, corn cob, digestibility, in vitro Source : https://ag2.kku.ac.th/kaj/PDF.cfm?filename=P044%20Fis02.pdf&id=2318&keeptrack=2  
Administrator 2016-12-01