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Articles by Che Roos Saad
Total Records ( 3 ) for Che Roos Saad
  Jun Chin Teh , Mohd Salleh Kamarudin , Abdullah Abd-Rahim , Che Roos Saad and Ehsan Ramezani-Fard
  Providing a suitable feeding delivery method is very important in the studies of the feeding behavior of medicinal leeches. In this study, several materials and membranes were tested for their suitability as blood carrier for the feeding of Asian buffalo leech Hirudinaria manillensis. In the first experiment, four different materials (sheep intestine skin, cotton wool, cellulose sausage casing and rubber sacs) were prepared and filled or soaked with pre-warmed cattle blood. The food was offered to leeches stocked in 10 L aquaria at 10 leeches per aquarium. All treatments were triplicated. The results showed that cotton wool and sheep intestine skin had severe blood leakage while cellulose sausage casing failed to allow leech feeding. Leeches successfully imbibed the blood with no visible leakage through the rubber sacs. In the second experiment, different solutions (150 mM sodium chloride, distilled water and 6 mg L-1 heparinized cattle blood) were prepared into rubber sacs. Similar feeding protocols as in the first experiment were followed. Percentages of leech that approached the sacs and the average volume consumed per individual were estimated. A little or no feeding response was observed for the sacs filled with saline and distilled water. This indicated H. manillensis were able to detect the blood contained in the rubber sacs and successfully imbibed the blood. Therefore, the rubber sac was found to be suitable as the blood carrier for the feeding of buffalo leeches.
  Jun Chin Teh , Mohd. Salleh Kamarudin , Abdullah Abd-Rahim , Che Roos Saad and Ehsan Ramezani-Fard
  The growth and survival of leeches are highly affected by environmental changes particularly the availability of food. In this study, Asian buffalo leeches Hirudinaria manillensis were stocked in 10 L aquaria at 10 leeches per aquarium and randomly assigned to five different feeding frequencies (once every 3, 6, 12 and 24 days) and no feeding. The leeches were fed with prewarmed cattle blood in rubber sacs. The results showed that leech fed every 3 days had the highest average growth both by day 30 (82.8%) and day 60 (115.8%). This followed by those fed every 6, 12 and 24 days. By day 60, no significant differences in growth were found among the feeding leeches except those fed at every 24 days which have a significantly much lower growth. Starved leeches (FS) had a negative growth throughout the experiment. The weight lost in starved leeches was due to the depletion of reserved energy in the body. The protein content of all leeches was extremely high (about 80%) and no significant differences in the body composition of among treatments were found. The study also showed that leech survival was not significantly affected by feeding frequency. A feeding interval of 6-12 days was recommended for the commercial culture of leech H. manillensis.
  Emy Yusliza Zolkefli , Sabarinah Sh Ahmad , Mohd Salleh Kamarudin , Che Roos Saad , Mohd Fakri Zaky Jaafar and Jamarei Othman
  This study was conducted to determine the thermal comfort conditions of a typical small-scaled enclosed freshwater prawn hatchery building. The thermal environment and comfort conditions were determined using in situ measurement for 12 continuous days and simulations. A small-scaled commercial hatchery at Sg Besar, Selangor was chosen for this study. The multi-data loggers were placed in selected area of hatchery building and the parameters measured were temperature (indoor, outdoor and water), light (indoor and water) and Relative Humidity (RH) (indoor and outdoor). The results showed that the indoor air temperature remained above comfort limit temperature (28.6°C) between 0900 and 1900 h beyond the working period (0700-1900 h). The water temperature remained above the optimal culture temperature (30°C) and reached the lethal limit (33°C) during the day. The average indoor relative humidity fell below outdoor relative humidity over the most of daytime and above the outdoor relative humidity at nighttime. The results indicated that daytime thermal environment in the hatchery building was extremely uncomfortable to the workers most of the time and at certain time could also detrimental to larval prawn growth.
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