Field and laboratory seeding experiments on farmed Eucheuma in the Philippines
1999
Corrales, R.V. (Philippines Univ. Diliman, Diliman, Quezon City (Philippines). Marine Science Inst.)
Vegetative regeneration is the only farming method for Eucheuma and Kappaphycus, the world's most important carrageenophytes.Lack of seedstock has been a problem following natural calamities, overharvesting, grazing, and outbreak of "ice-ice" disease. Hence, studies to develop an alternative method of generating Eucheuma and Kappaphycus sporelings on a seaweed farm in Tawi-Tawi, Philippines were carried out from May 1993 to July 1994. Mactan stone blocks were deployed in two positions at two sites in Tawi-Tawi, one of the biggest farming areas in the Philippines. Recruits were first observed five months after deployment. Tested ANOVA was used to investigate the effect of current speed (C), water movement (M), number of days with minus tide (D), salinity (S), temperature (T), areas of deployment (A), and position of blocks (P) on the recruitment of sporelings (R). Since C, M, D, S, and T were always on the same mean level within an area, the effects of these variables were assumed by the effect of area and thus, the A and P variables were the ones fitted in the ANOVA model. Repeated measures of ANOVA showed no significant difference in the effects of A and P variables on visible R from May to Nov 1993 and March to July 1994. The Helmert transformation showed that mean recruitment of Eucheuma and Kappaphycus between May 1993 and subsequent time points was significantly different. This was also true for recruitment in Sep, Dec 1993 and Jan and Feb 1994, which were highly and significantly different compared to the means of subsequent time points. Multiple regression analysis showed that C, D, and S had significant effects on recruitment of Eucheuma and Kappaphycus in both areas while the effect of T was significant only in area 1
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