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International Research Journal of Applied Life Sciences

Open Access journal
ISSN (Print) 1839-8499 - ISSN (Online) 1839-8499
Published by SETScholars

[5 journals]

Growth performance of climbing perch (Anabas testudineus) in monoculture and polyculture system
- Authors: david rintu das
  Abstract: An experiment was conducted to observe water quality, growth performance of Thai koi (Anabas testudineus) and cost-benefit analysis under different stocking densities over a period of 110 days from August to November, 2011 at the Syedgram, Muktagachha Upazila of Mymensingh district. There were two treatments (T1 & T2) initial average weight 0.11 in T1 and 0.15g in T2 and stocking density of 2000 fry and 1000 fry with rui, catla, mrigal, shing ,tilapia per decimal in T1 and T2 respectively. Commercial pelleted feeds from Agro Bangla and Paragon were supplied to each treatment three times daily from the beginning of the fry stocking. The water quality parameters such as temperature were ranged from 27.35 to 30.50°C, pH from 7.87 to 8.45 and dissolved oxygen from 4.80 to 5.95 mg/l. At the end of the study, the average weight gain of Thai koi was 66.55 and 90.75 g in T1 and T2. The highest weight gained in T2 in which stocking density was 1000 fry/dec. The survival rate of Thai koi was recorded to be 88.97% and 98.60% in T1 and T2. The production was 29146 and 27170 Kg/ha in T1 and T2 respectively. The production was significantly different between the two treatments (T1 and T2). The net profit was 4681 and 5514 Tk/dec. in T1 and T2 respectively. The net profit was higher in T2 than T1. The total production was increased with the increasing of stocking density but the individual fish growth was decreasing with increasing of stocking density. Based on this result of the experiment farmers could be suggested to culture Thai koi with rui, catla, mrigal, shing, tilapia fishes at lower stocking density to get higher benefit in the short period of time.
  PubDate: 2013-05-15
  Issue No: Vol. 2 (2013)
Morphology and histopathology of alimentary canal of Clarias batrachus (Linnaeus) and Heteropneustes fossilis (Bloch)
- Authors: david rintu das
  Abstract: Morphology and histopathological study of alimentary canal of Clarias batrachus and Heteropneustes fossilis was conducted during November, 2011 to April, 2012. Sampled fish were collected from the water bodies of Mymensingh and studied for histopathological infested changes with caryophyllaeid cestodes. The mucosal surface of the intestine in C. batrachus and H. fossilis has numerous folds lined by simple tall columnar cells, along with goblet cells, which were significantly more in C. batrachus. Stomachs of C. batrachus were found to be infected by Djombangia penetrans and different pathological changes were observed. The scolices of the worms were seen perforated through the stomach and surrounded by fibrous connective tissue. In infected stomach, the stomach wall is completely destroyed at the point of attachment. The mucosa and sub mucosa layers become atrophied due to the pressure of the worm. The cestode parasite Lytocestus indicus has deeply penetrative type of scolex, which caused the heavy mechanical injury to the intestinal tissue of C. batrachus. The epithelial compression, inflammation was observed. The scolex of the parasites crossed majority of the intestinal layers and reached near serosa suggesting that, it was very dangerous and destructive parasites to the host. No stomachs and intestines of H. fossilis were found infected with cestode parasites during the study period.
  PubDate: 2013-05-15
  Issue No: Vol. 2 (2013)