Abstract: Hippocampus kuda Bleeker is an official oceanic fish in Chinese traditional medicine. Because of the great contradiction between supply and need , the nature resources of Hippocampus kuda Bleeker have declined sharply. The food consumption , growth and ecological conversion efficiency of H. kuda were studied in the Commercial Rearing Base Guangdong Richvast , the South China Sea , Guangdong Province. The Elliott2Persson model and Eggers model were used to determine its feeding periodicity , to quantify its food consumption quantity , consumption rate ,evacuation rate and food as well as energy conversion efficiency. The results indicated that seahorse (the range of body length 88. 5 -141. 3mm , body weight 5. 75 -13. 27g wet) fed in daytime with two peaks in 12 :00 and 18 :00 and were not fed in nighttime (the density is 200 ind·m 3 , DO is beyond 5. 5mg ·L -1 , BOD is below 3mg·L-1,pHis 7.5-8.2,transparencyis 50-85cm,salinityis 15.2-26.5). The mean daily food consumption of H. Kuda was 16. 634 2 ±0. 782 0g·(100g) 1 per day. The food consumption rate was 1 177. 25 cal ·ind -1 per day and evacuation rate was 0. 144 4g·(100g) -1 ·h -1. Its food and energy conversion efficiency was 20. 04 % and 31. 42 % respectively. The mean growth speed of its body length and daily growth rate was 1. 176 6mm per day and 1. 27 % respectively . The mean body weight growth speed of H. kuda and daily body weight growth rate were 0. 182 0g per day and 2. 27 % respectively. The food consumption of seahorse correlated with enviromental water temperature significantly ( P < 0. 01) . It can be expressed by the formula : FC =0.458 4+0.626 8 T ( P < 0. 01) . The relationship between the food consumption rate and its body weight as well as water temperatuer can be experssed better by the formula C =6.754 4 0.3014 T 0. 219 0 W ( F = 83. 596 3 F0.01 =18.00 F > F0.01)) .