NDLI: Cultivation of Gracilaria dura in the open sea along the southeast coast of India

Content Provider	Springer Nature Link
Author	Veeragurunathan, V. Eswaran, K. Malarvizhi, J. Gobalakrishnan, M.
Copyright Year	2015
Abstract	Gracilaria dura is an important red alga having the potential for commercial farming. To cultivate this alga, the floating bamboo raft method was employed. The study was carried out during October 2010 to September 2012 at the southeastern coast of India. The impacts of seasonal variation, initial seed density, harvest period, depth, and epiphyte and epifauna attachment on the raft were analyzed. A clear seasonal trend was observed in the biomass yield in G. dura in this 2-year study. The highest biomass yield (2.01 ± 0.68 kg FW m$^{−2}$) and daily growth rate (DGR; 3.17 ± 1.71 % day$^{−1}$) were observed in winter (January to March). ANOVA results also showed no significant variations between DGR and biomass yield between the first and second year (p > 0.05). The algal biomass decreased during summer (April to June) due to high surface seawater temperature and tissue bleaching. Maximum biomass yield and DGR were observed at a low initial seed density of 50 propagules m$^{−2}$ (2 kg raft$^{−1}$) with 45 days of culture period. The rafts cultivated in submerged condition showed a high growth rate (2.31 ± 1.35 % day$^{−1}$); however, it did not vary significantly with cultivation at the surface level. Grazing was observed to be most severe during the months of April to August by selective fishes like Pteroscirtes mitratus, Siganus canaliculatus, Pelates quadrilineatus, and Monodactylus kottelati; the crab Portunus pelagicus; and the isopod Cymodoce truncata. From the 2-year study, it was found that October to March is the ideal period for the large-scale cultivation of this alga.
Starting Page	2353
Ending Page	2365
Page Count	13
File Format	PDF
ISSN	09218971
Journal	Journal of Applied Phycology
Volume Number	27
Issue Number	6
e-ISSN	15735176
Language	English
Publisher	Springer Netherlands
Publisher Date	2015-01-08
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Gracilaria dura Rhodophyta Agarophytes Raft culture Seed stock density Depth Season Plant Sciences Freshwater & Marine Ecology Plant Physiology Ecology
Content Type	Text
Resource Type	Article
Subject	Plant Science Aquatic Science

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