Study On Natural Habitat Of Tanichthys Albonubes And Research On Feeding Habit Of Wild Tanichthys Albonubes

The habitat and feeding habits of Tanichthys albonubes in Conghua town,Guangdong province were investigated from June 2005 to February 2006 every two months, The water quality of the habitat was better in June 2005, December 2005, and February 2006 than in other months. High concentration of Total nitrogen appeared in August 2005, and both total nitrogen and total phosphorus were high in October. The contents of nitrogen and organic materials in sediment were high, but the contents of phosphorus were low.The stomach contents of T. albonubes were consist of plankton, meiobenthos and insects. Diatom, one of the stomach contents, had high appearance rates in both sediment and stomach, but low appearance rate in water bodies. Chlorophyta was rich in water bodies, but poor in sediment, and filaceous or big Chlorophyta have high appearance rate in stomach. Cyanophyta has low appearance in stomach. Copepoda larva has high appearance rate in both water bodies and stomach, Cladocera has high appearance rate in stomach but low appearance rate in water bodies, And two kinds of insects, Hydracarina and Tendipedidae only appeared in February.Compositions of food of the fish changed in different seasons. T. albonubes feeded on Chlorophyta, diatom, Cladocera and Copepoda in Jun, Chlorophyta, diatom and Copepoda in August, Chlorophyta, Cladocera and Rotifera in October, Chlorophyta, diatom, Copepoda and incests in December, Chlorophyta, diatom, and incests in February. Food menu also depended on the body size of T. albonubes. When the fish length was 10-14mm, they feed on Copepoda, Cladocera, and rotifera. The fish whose length was 14-26mm feed on diatom, Chlorophyta, Copepoda and Cladocera. Stomach contents in fish whose body length was over 26mm consists of zooplankton and insects.