World Aquaculture Society Meetings

TUBULAR NETS- AN INNOVATIVE TECHNIQUE OF PRODUCING THE HIGHER VALUED SEAWEED Kappaphycus FOR COASTAL COMMUNITIES IN TANZANIA  

*Flower E. Msuya
 
Institute of Marine Sciences
University of Dar es Salaam
Mizingani Road, P.O. Box 668
Zanzibar, Tanzania
flowereze@yahoo.com

Kappaphycus production in Tanzania has decreased in the last fifteen years because of its vulnerability to environmental changes when cultivated using the traditional shallow water off-bottom method. A new innovative technique -the tubular net technique - was studied for one year to test its viability as a novel method of cultivating Kappaphycus in deeper waters (1 - 3 meters at low tides) in Zanzibar, Tanzania.

Results showed that tubular nets can be used effectively to cultivate Kappaphycus with monthly average specific growth rate (sgr) of 2.1±0.1 d-1 recorded in July 2015 to 12.6±4.7 % d-1 recorded in September 2014. In the off-bottom, sgr was 2.0±0.2 % d-1 to 10.3±4.5 % d-1. Water temperature averaged 29.0±0.4 - 32.7±0.4 0C in the deep water and 29.0±0 - 34.0±1.1 0C in the shallow water depending on the season. Salinity averaged 26±0 - 35±0 ‰ in both cases.  

Nutrient concentrations (ammonia, phosphate, and nitrate) maximised at 5.5, 0.9, and were higher in the shallow than deeper water (Table 1). Breakage of the seaweed was 30% in the deeper water compared with up to 80% in the shallow water, depicting the suitability of the tubular net method in cultivating Kappapphycus in Tanzania.




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