Abstract:

The energy conversion efficiency and carrying capacity were studied in three higher-altitude Litopenaeus vannama culture ponds. The results showed that the mean value of phytoplankton quantity were 9.79×107 cell?L-1, ranging from 3.45×107 cell?L-1 to 1.71×108 cell?L-1. The mean value of primary productivity were 5.27 g?m-2?d-1, ranging from 1.28 g?m-2?d-1 to 11.38 g?m-2?d-1. Gross primary production was 11573.30 MJ, feeding energy was 32663.62 MJ, fertilizer energy was 229.71 MJ, fry energy of stocking was 1.43 MJ and harvest energy was 5269.12 MJ, total input energy was 44468.04 MJ. The energy conversion efficiency was 11.85％ in higher-altitude Litopenaeus vannama culture ponds. At the same time, estimation of carrying capacity by the toal nitrogen load was 157×104 larvae?hm-2