Browsing by Author "Ganesalingam, Z."

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    A Comparative Study on Culture of Kappaphycusalvarezii Using Cage Culture and Monocline Culture in Kiranchi Bay, Kilinochi.
    (Uva Wellassa University of Sri Lanka, 2012) Ganesalingam, Z.; Jayamanne, , S.C.; Pahalawattaarachchi, V.
    Kappaphycusalvarezii is economically important red tropical seaweed with a high demand due to containing polysaccharides in its cell wall and being the most important source of n-carrageenan in the world. The market for carrageenan grows rapidly since current sources of cultivated eucheumatoids seems incapable of meeting the high demand, at least in quality, price and volume for the requirements of the processing industry. Commercial cultivation of K. alvarezii was developed in the Philippines during the latter half of the 1960s using local varieties selected from the wild in comparison to different culture method practices of Kappaphycusalvarezii. The present study was conducted to find out the method more suitable for culturing K. alvarezii in Sri Lanka. Two culture systems, cage culture and monocline culture was conducted at Kiranchi Bay, Kilinochchi for a period of two months using cage culture and monocline method. Healthy seeds were collected from an existing cage culture and propagates approximately 100 g in weight were chosen. In monocline culture, the propagates were tied into nylon lines about 4 meters apart and anchored to the substratum at 25 cm intervals. In total, 75 kg were tied to monocline. In cage culture, cages of 1.5 m long x 1 m wide x 0.5 m height were placed in the bay. The cage frame was covered with mesh and K. alvarezii were tied in parallel lines. Data on initial weight, and weekly weights were taken every week and their growth was measured. The results showed that K. alvarazii gained 58% of initial weight within 2 months in monocline culture while 68% in cage culture. It was noted that the nutrients (Nitrite, Nitrate and unionized Ammonia did not show a significant difference (P>0.05) during the study period in the two culture sites. The growth rate of K. alvarezii is good in Kiranchi bay using both methods are encouraging and further studies may be required to establish culture.
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    Comparison of Different Culture Method of Kappaphycus Alvarezli with Respect to Environmental Condition of Kiranchi Bay/Kilinochchi
    (Uva Wellassa University of Sri Lanka, 2012) Ganesalingam, Z.
    The development of commerce based on Kappaphycus alvarezii is an outstanding example of widespread farming that evolved from simple methods refined mainly by faimers in the field. This phenomenon has led to current production exceeding 150,000 dry tons/yr from at least ten countries. Coastal areas of tropical regions where seaplanes are the main source of income. The information base for Kappaphycus alvarezii is expanding but has not yet achieved useful stability. Much "knowledge" about the biology of Kappaphycus alViirezii is practical conjecture extrapolated from studies of other seaweeds. Kappaphycus alvarezii production is discussed in light of the plants' biology and the agronomic techniques employed by farmers. Socio-economic factors discussed but emphasis is laid on the characteristics of cultivar populations, factors involving farm location and practical agronomy. Producing red alga Kappaphycus alvarezii were cultured in Kiranchi bay, Kilinochi over two months period using monoline and cage culture methods. Seawater temperature ranged from 28 to 31 °C. Ammonia accounted for 55.1-89.8% it depending on the season, and salinity did not change significantly. Temperature was the only environmental factor that explained 96% of the observed variation in Kappaphycus alvarezii growth rate The highest average growth rates June to August. The growth rates of Kappaphycus alvarezii were exponential during April to June. As propagule weight increased the growth rate was reduced.