This study showed the uses of garlic (Allium sativum) supplemented feed on Clarias batrachus for the judgment of garlic potential against Acanthocephala. Garlic allicin content (an active component of garlic) worked for C. batrachus to inhibit infection by Acanthocephala. Four garlic supplemented diets (50, 100 150 and 200 ml/kg) of different concentrations and a non-supplemented control diet were fed to C. batrachus for three months. Long-term (90 days) supplementation with garlic significantly reduced infection success by up to 80% as compared to controls and did not negatively affect palatability of the feed, Specific Growth Rate (SGR) (3.60±0.13) and Food Conversion Ratio (FCR) (2.33±0.38). Infection success was not influenced by short-term (30 days) supplementation suggesting that a delayed host response must occur to improve resistance to infection [prevalence (71%, 35%) and intensity (0.8, 0.5)] and 60 days conditioning period showed reduction of parasite respectively [prevalence (75%, 25%) and intensity (1, 0.6). Incorporation of garlic into a pressure-extruded pellet was found to be an effective method of delivery as only minimal leaching of allicin from the diet occurred (˂ 3% of allicin detected) during the interval of water contact between delivery and consumption. This study demonstrates that garlic extract (200 mL/kg) administered as a dietary supplement is one of the most practical methods to prevent Acanthocephala infection in Aquaculture.
The study was carried out to assess the impact of diseases on fish production in baors of Jessore district, Bangladesh from March 2012 to January 2013. Studied baors were selected randomly from each sub-district which covered 39.22% of total baors and 71.87% baor areas in Jessore district. All the surveyed baors were affected more or less by various diseases and in 80% baors noticeable production loss occurred almost every year. The main diseases were epizootic ulcerative syndrome (EUS), dropsy, gill rot and fin rot; out breaking time ranged from November to February each year. EUS was recorded in 85% baors whereas other diseases were found in various baors at various percentages: dropsy (75%), gill rot (45%) and fin rot (55%). Conferring to the number of affected fishes, 31.25% were affected by EUS, 37.5% by dropsy, 12.5% by gill rot and 18.75% by fin rot. In the year 2012, 0.513% loss of production has occurred that designated 0.7599 million BDT. Through successful work on disease control and management, production loss may be minimized.
Abstract:The study was conducted on the hatchery labors in some selected area of Jessore Sadar Upazila in Bangladesh under the district of Jessore by using a logical questionnaire on socio-economic condition of hatchery labor. The main objective of the study is to know the socio-economic condition of the hatchery labors in some selected area of Chanchra region of Jessore district. The specific objectives are to know the different labor categories in hatcheries of Chanchra region and to know the socio-economic condition of hatchery labors. A total of 40 hatchery labors were selected and interviewed. It was found that the average age group of hatchery labor is 26-35 years, predominantly all of them are male and any presence of female labor was not found. It was found that about 95% labor use tube-well water and 5% use deep tube-well water. Regarding mean of transport, 65% labor move by on foot. It was found that about 75% hatchery had no medical treatment facility. However, further study about the socio-economic condition is needed and institutional, organizational, technical and credit supports are needed for their better socio-economic and sustainable livelihood.
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