Growth and carrageenan quality of Kappaphycus striatum var. sacol grown at different stocking densities, duration of culture and depth

Abstract

Kappaphycus striatum var. sacol was grown in two separate studies: (1) at two stocking densities, and (2) at four different depths, each for three different durations of culture (30, 45 and 60 days) in order to determine the growth rate of the seaweed and evaluate the carrageenan content and its molecular weight. The results demonstrated that stocking density, duration of culture and depth significantly (P<0.01) affected the growth rate, carrageenan content and molecular weight of K. striatum var. sacol. Decreasing growth rate was observed at both stocking densities and at four depths as duration of culture increased. A lower stocking density (500 g m −1 line −1 ) showed a higher growth rate for the shortest durations, i.e. 30 days, as compared to those grown at a higher density. Likewise, decreasing growth rate was observed as depth increased, except at 50 cm after 60 days of culture. A 45-day culture period produced the highest molecular weight at both stocking densities (500 g m −1 line −1 = 1,079.5±31.8 kDa, 1,000 g m −1 line −1 = 1,167±270.6 kDa). 'Sacol' grown for 30 days at 50 cm (1,178 kDa) to 100 cm (1,200 kDa) depth showed the highest values of molecular weight of carrageenan extracted. The results suggested that K. striatum var. sacol is best grown at a stocking density of 500 g m −1 line −1 , at a depth of 50-100 cm, and for a duration of 30 days in order to provide the highest growth rate, carrageenan content and molecular weight.

Growth Rate of Kappaphycus striatum var cottonii at Different Positions of the Cultivation Lines to the Direction of Water Current

“…The very shallow waters are also the natural habitat of herbivorous fishes (mainly of the families Acanthuridae, Scaridae and Siganidae), which can cause total crop loss [19]. Water temperature and salinity of the present study had a comparable range of the previous study with 27.67-30.72 °C and 24‰-30‰, respectively [20] that were within the required levels for eucheumoid cultivation [21].…”

A comparative analysis of phycocolloids produced by underutilized versus industrially utilized carrageenophytes (Gigartinales, Rhodophyta)

“…Such differences may be related to the duration of culture and also site-specific, environmental conditions (see Fig. 1) as outlined by previous workers with K. alvarezii (Ohno et al 1996;de Paula et al 2002;Muñoz et al 2004;Wakibia et al 2006;Hayashi et al 2007a, b;Hung et al 2008;Hurtado et al 2008), K. striatum (Hurtado et al 2008), E. denticulatum (Wakibia et al 2006), and E. isiforme (Freile-Pelegrín and Robledo 2006). The present study further supports the need to undertake more detailed investigations of the availability of cold water carrageenophytes and their sustainable harvesting and/or cultivation for industrial hydrocolloids.…”

Co-culture of sea cucumber Holothuria scabra and red seaweed Kappaphycus striatum

“…During the second harvest cycle (February to March), growth (reported here as percentage weight increase per day for comparison with previous studies) for all cultivated seaweed treatments was 5.3% d −1 compared to 1.1–4.0% for K . striatum cultured in its native Philippines (Hurtado, Critchley, Trespoey & Bleicher‐Lhonneur ), 1.4–5.9%, in Japan (Mairh, Soe‐Htun & Ohno ) and 2.4–7.6% in India (Mairh, Zodape, Tewari & Rajyaguru ). While K. striatum growth rates are unreported for Tanzania; growth of K .…”