Journal of Tropical Oceanography ›› 2009, Vol. 28 ›› Issue (6): 112-116.doi: 10.11978/j.issn.1009-5470.2009.06.112cstr: 32234.14.j.issn.1009-5470.2009.06.112

• Marine biology • Previous Articles     Next Articles

Effects of delayed feeding on survival, feeding and growth of Ctenogobius gymnauchen larva

WANG Guo-dong1, ZHENG Yan-jing1, LI Jian-jun2, YANG Xiao-bo2, HUANG Ren1   

  1. 1. Guangdong Laboratory Animal Monitoring Institute, Guangzhou 510260, China
    2. Guangdong Provincial Fishery School, Guangzhou 510320, China
  • Received:2007-11-26 Revised:2008-01-20 Online:2009-12-30 Published:2009-12-12
  • Contact: 黄韧 E-mail:labking@sohu.com
  • About author:王国栋(1981-),男,山东省潍坊市人,实习研究员,硕士,主要从事养殖水域生态学方面的研究工作,Email:kingdomkey1981@hotmail.com。
  • Supported by:

    广东省自然科学基金项目(07003546)、(8151026005000002);广东省科技计划项目(2007B080501005、2007B080501004)

Abstract:

Effects of delayed feeding on survival, feeding and growth of Ctenogobius gymnauchen larva were studied. One hungry control group (ten parallels) and five delayed feeding groups (four parallels) were designed. The initial feeding began 1, 2, 3, 4 and 5 days after the larva were hatched out and the diet was Brachionus plicatilis. Results showed that: the initial feeding time of Ctenogobius gymnauchen larva was the 1st day after hatch.. The larva arrived at the point of no return (PNR) at 3-4 days. The initial feeding rate was lower, then increased to the peak at 2nd day after hatch and rapidly decreased then. The highest initial feeding rate was 54.55%. The survival rates were significantly decreased with increasing of delayed feeding time. Similar trends were observed in the length growth rate. The results indicated that the optimum initial feeding time for the larva is the 1st after hatch.

Key words: Ctenogobius gymnauchen, larva, delayed feeding, survival, feeding, growth