中华间吸鳅食性及年龄生长的初步研究

PRELIMINARY STUDIES ON THE DIET,AGE AND GROWTH OF HEMIMYZON SINENSIS

摘要: 对金沙江下游中华间吸鳅的食性和年龄生长进行了初步研究。中华间吸鳅为杂食性鱼类,其食物主要包括藻类、高等植物碎片、水生昆虫、软体动物。适宜的年龄鉴定材料为鳞片和微耳石,两者年龄鉴定结果的符合率为85%,且以鳞径对生长的退算结果与实测体长相符。体长与体重的回归方程为:W=1.08×10-4L2.5604,微耳石半径与体长、鳞径与体长的回归方程分别为:BL=59.995+130R和BL=36.704+117R。

Abstract: The diet, age and growth of Hemimyzon sinensis in lower reaches of the Jinsha-jiang River were studied.The fish is omnivorous.It mainly feeds on algae, detritus of high plant, aquatic insect and mollusc.The proper materials for aging are scale and lapillus.The aging results from scale correspond with that from lapillus in 85 % .The back-calculated body length from scale fits the practical growth.The regression equation of body length with body weight is W= 1.08 ?10-4L2.5604, that of body length with radius of lapillus is BL=59.995 + 130R, and that of body length with radius of scale is BL= 36.704 + 117R.