Cyst production in native strain of Artemia pathenogenetic
2005
Shah, S.G.A. | Ali, W. | Jamil, K. | Akhtar, M.,PCSIR Labs., Karachi (Pakistan).Food and Marine Resources Research Centre
The Artemia parthenogenetic a native strain from Karachi Solar Salt Works wascultured in three ponds of 1.5m2, in the laboratory to study the cyst productionduring the period (2002-2004). The production of cysts was recorded every weekand physicochemical parameters, temperature, salinity, dissolved-oxygenconcentration, pH, and water level were recorded. Individual Artemia released 35-500 numbers of cysts after every five to six days interval and lowest 15-50 cystunder adverse conditions e.g. high temperature, scarcity of feed etc. The life spanof Artemia has been recoded to three and half months (115 days) and during thisperiod 80-100g of cyst collected from each ponds/ month. In order to obtain ahomogenous population with all females in the same mode of reproduction someabiotic conditions were manipulated very strictly. Artemia grew in 75 cm deepwater level in ponds and were propagated extraordinary well, leading to asuccessful harvest of cyst and adult. Feed, temperature and salinity were foundmost important for propagation of Artemia and quality of cyst. The cystproduction was low from May-July due to high prevailing temperatures and withdecrease phytoplankton population in the ponds. During the study DAP (Di-Ammonium Phosphate) and Urea was applied as a fertilizer every week in eachpond for maintenance of primary productivity (phytoplankton). The average size ofhydrated and dried cyst was between 240 plus minus 13.1 mum to 258 plus minus9.7 mum [n=250]. The temperature varied between 10-29 degree C. A total of 8 kgcysts were collected and processed during the study.
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