Experiment on Rearing Yearling Fingerlings of Mandarin Fish

Zhu Yongan et al(Freshwater Fisheries Research Institute of Shandong Province, Jinan 250117)

nursing yearling mandarin fish-fingerling; culture of the feed-fishes; feeding dose; "Anti-fish disease"soaked fluid; Lernaea; survival rate

The purpose of the experiment on rearing yearlings fingerlings of the mandarin fish is to meet the need of the big-sized fingerlings for the mandarin fish culture on a large scale. 8400 summer fingerlings of the mandarin fish were stocked into two ponds (the area of each one is 1. 2 mu ) nursing 92 days. 493.2 kg of the big-sized mandarin fish fingerlings with the average size of 68.5 g/ind. were harvested. The survival rate was 9O%. In the experiment the fingerlings or the mandarin fish were fed on the fry or fingerlings of other kinds of fishes cultured in the nursery pond with the ares of 4.8 mu. The feeding dose accounts for 12 % of the body weight of the mandarin fish. Every4～5 days the feed-fish (body length of 50～6O % shorter than that of the mardarin fish)was fed to the mandarin fish. It has a good effect to kill the Lernaea with the “anti-fish disease”made of the Chinese herbal medicine soaked in the boiling water of 250～300g per mu. The experiment proved the size of the mandarin fish fingerlings cultured in the same pond is as good as uniform,and in the fast growing period the feeding dose should be increased in time.