大鳞副泥鳅摄食节律及日摄食量研究

Study on feeding rhythm and daily feed intake of Paramisgurnus dabryanus

为建立大鳞副泥鳅(Paramisgurnus dabryanus)的科学投喂策略,在实验室内开展了大鳞副泥鳅的养殖模拟实验,通过72 h的观察,探讨了不同体质量和不同性别大鳞副泥鳅的昼夜摄食节律及日摄食量。结果表明,大鳞副泥鳅属于典型的夜间摄食类型,一天中有2个极明显的摄食高峰,集中在04:00—05:00和20:00—21:00。大鳞副泥鳅的昼夜摄食节律与个体大小和性别无显著相关性。小规格雌、雄群体均具有最大的日摄食量,且雌性群体的日摄食量随着个体大小的增加显著降低。15℃条件下,大鳞副泥鳅群体的日摄食量占群体总体质量的2.2%~4.8%,个体的日摄食量约占个体体质量的3.0%。建议大鳞副泥鳅的投饲频率为一天2次,以体质量的3%~5%进行饲料投喂,最佳投饵驯化时间集中在6:00—7:00和18:00—19:00。

To determine a scientific feeding strategy for loach(Paramisgurnus dabryanus),we conducted a simulation experiment in laboratory to investigate the day and night feeding rhythm and daily feed intake of the fish with different body mass and sex for 72 h.P.dabryanus showed a typical nocturnal ingestion pattern with two extremely obvious feeding peaks(04:00–05:00 and 20:00–21:00).There was no significant relationship between day and night feeding rhythm and size or sex.For both males and females,small fish had the highest daily feed intake,and the daily feed intake of female decreased significantly with increasing size.At 15℃,the ratio of daily feed intake to total body mass of P.dabryanus in groups was 2.2%– 4.8%,and the ratio of daily feed intake to body mass of individual P.dabryanus was 3%.It is concluded that a scientific feeding strategy for P.dabryanus is feeding twice a day with feed of 3%– 5%of body mass at 06:00– 07:00 and 18:00– 19:00.