摘要
瓦氏黄颡鱼繁殖群体的雌雄性比为1:1.17,雄性群体2-3龄鱼占81.4%,雌性群体2-3龄鱼占92.5%。体长13-15㎝㎝体㎝㎝繁殖群体的㎝㎝㎝㎝,雌雄繁殖群体体㎝㎝㎝㎝㎝㎝㎝集中在30-50g和40-70g之间。不同年龄、不同性㎝、不同性腺发育阶段之间,其肥满度和脂肪系数均存在不同程度的生长差异,通常以2龄鱼和性腺发育到Ⅱ、Ⅲ期㎝体较高,发育到同期的雄性群体脂肪系数通常高于雌性群体,而肥满度略低于雌性群体。
The sexual ratios of females vs. males in the reproductive population of Pelteobagrus vachelli are 1：1.170 The age composition of the reproductive population ranges from 2-7 year in the male and 2-4 year in the female.The dominant age groups are 2-3 year-old （81.4% in the male and 92.5% in the female）.The dominant distributions of body length in the reproductive population range from 13-15cm （61.4% in the male and 56.3% in the female） and those of body weight range from 40-70g in the male （68.0%） and 30-50g in the female （64.1%）.The average values of fatty coefficient are 1.3453 in the male and 1.4072 in the female .The average values of flesh coefficient are 5.1413 in the male and 4.4012 in the female.
The fatty coefficient and flesh coefficient are higher in the 2th age group or during the development stage Ⅱ and stage Ⅲ than in other age groups or other development stages, which means they must accumulate enough energy and nutrition before entering the breeding season.during its breeding season,Pelteobagrus vachelli should consume large amounts of its energy and nutrition ,especialy in the female ones.
出处
《重庆三峡学院学报》
2006年第3期72-74,共3页
Journal of Chongqing Three Gorges University
关键词
瓦氏黄颡鱼
繁殖群体
种群结构
生长特性
Pelteocagrus vachelli
reproductive population
population oomposition
growing characteristics.
