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| Observation on the adaptation of Yangtze finless porpoise (Neophocaena phocaenoides asiaeorientalis) to artificial feeding |
| YU Daoping,JIANG Wenghua,HAN Demin |
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Abstract A total of 24 Yangtze finless porpoises (Neophocaena phocaenoides asiaeorientalis)were captured from Tongling section of the Yangtze River in 1989,1992,2001 and 2003. Various temporary feedings were conducted for up to 88 days in the mainstream of the Yangtze River. It was found that the behavioral adaptation of the finless porpoises to the artificial feeding consisted of three types:(1)Refusing food;(2)Vigilance;(3)Accepting food. Our paper suggested that the average time of refusing food lasted 2.4 d (3 days for adults and only 1.5 days for juveniles). There was a distinct difference in the time of refusing food between adults and juveniles (P < 0.01). Daily food intake showed an ascending tendency in both winter and spring,but a significant difference (P< 0. 01)was found between the two seasons. The duration of vigilance spent by the porpoises was less than 3 min after the second week,but this behavior went on for a long period. Based on observations in winter,the fact that,by the seventh week,food intake in 40 minutes by Yangtze finless porpoise decreased to less than 7% of body weight was a response to artificial feeding.
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