Title Nutrient uptake by Undaria undarioides (Yendo) Okamura and application as an algal partner of fish-alga integrated culture
Authers Hajime KIMURA, Masahiro NOYOYA and Daisuke FUJITA
Keywords
Citation Bull. Fish. Res. Agen. supplement No. 19,143-147, 2007
Abstract
Nitrogen (N) and phosphorus (P) budgets in a fish-alga integrated culture were studied using an edible kelp,Undaria undarioides and the red sea bream Pagrus major in Tanabe Bay, Japan. The kelp was cultured on one rope (16 m in length) surrounding a fish culture cage (3 x 3 x 3 m) to reduce the loads of fish discharge. From 2002 December to 2003 March, 260 young red sea breams (172.7 g in average), were cultured in the cage by feeding 18.4 kg of artificial compounds containing 1435 g nitrogen and 282 g of phosphorus. At the end, 8.3 kg of fish growth was obtained; 243 g (16.9 % of the given feed) of N and 71 g (25.2 %) of P were stored in the fish bodies. During the culture, kelp absorbed N and P at estimated rates of 3.11µg atm/wet g/hr and 0.16µg atm/wet g/hr, yielding 161 kg of commercial size on the rope. The total amounts of N and P absorbed by kelp corresponded to 40.5 % and 25.9 % of those in given food, respectively. This is the first report of the total N and P budgets in a fish-alga integrated culture in Japan.
URI http://www.fra.affrc.go.jp/bulletin/bull/bull19/15.pdf