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Comparison of Three Culture Methods of Red Seaweed in Coastal Waters off Northern Sri Lanka Public Deposited

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Suggested Bibliographic Reference: Challenging New Frontiers in the Global Seafood Sector: Proceedings of the Eighteenth Biennial Conference of the International Institute of Fisheries Economics and Trade, July 11-15, 2016. Compiled by Stefani J. Evers and Ann L. Shriver. International Institute of Fisheries Economics and Trade (IIFET), Corvallis, 2016.

Proceedings of the Eighteenth Biennial Conference of the International Institute of Fisheries Economics and Trade, held July 11-15, 2016 at Aberdeen Exhibition and Conference Center (AECC), Aberdeen, Scotland, UK.

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  • Kappaphycus alvarezii is economically-important seaweed due to higher carrageenin contents. Suitable culture-method, culture-sites and solutions for fish-grazing have not been tested. Hence, growth-rate ofK.alvarezii under three culture-methods namely raft, line, and cylinder-cage were compared off Velanai and Kayts, in northern Sri Lanka from April-August 2014. Raft and line culture-methods were further tested with 3-combinations, i.e., completely-encircling by a net, combining with shark-models to scare fish; and treatment. Three-replicates were used for each-combination. As cylinder-cage was fully-covered neither net-covering nor shark-model combined. Around 60-seedlings of 90-100g were tightened to each raft and line and inserted into cylinder-cage. From each replicate of line and raft, randomly-selected seedlings were weighted and replaced in three-day intervals to determine growth-rate and weight-lost while entire cylinder-cage was weighed. Intensity of mechanical-damages and grazing-activity were recorded on each sampling-day. In both the line and raft methods the encircled-net combination showed highest growth-rate. However, debris clotted net-meshes resulting low growth-rate at the latter-part of culture-cycle. Cylinder-cage resulted the highest growth-rates and economic-profit. Grazing activity was zero in cylinder-cage and weight-lost due to mechanical-damages was zero as broken-parts can remained inside. Due to smaller-size, cylinder-cage can be cleaned frequently to avoid clotting. Under all culture combinations K.alvarezii growth-rate was redundant after 40-days thus, harvesting is recommended. Conditions at Velanai were best for seaweed-culture. Shark-model was not effective at the latter-part of culture-cycle as fish got used to it. Perhaps, a mobile shark-model could be an alternative. Use of cylinder-cage for culturing K.alvarezii is effective, profitable and environmental friendly.
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  • 0976343290

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