Abstract: Mass zoospores were induced to release from sea weed Costaria costata collected from culture rafts by drying in air and were spread on nylon strings.The germination of zoospores,development of gametophytes and growth of juvenile sporophytes were studied in natural seawater temperature.The zoospores were found to germinate into gametophytes over 24 h at 16℃.The female and male gametophytes developed rapidly into clusters in diameter of 50 μm and 45 μm from 16℃to 20℃,but developed slowly at 22℃,even stopped developing over 23℃. The mature female and male gametophytes produced oogonia and antheridia with formation rate of 70%for oogonia and 62%for antheridia,from which released eggs and sperm from 21.5℃to 20.5℃.The juvenile sporophytes had good growth from 21.5℃to 20℃.The sporelings had length of over 200 μm after germination,0.3 cm after one month holding cultivation,and mature sporophytes length of 3 m and width of 35 cm in sea cultivation.
2011, Vol. 26 
