摘要
1994年5月至1995年6月对洪湖日本沼虾的种群繁殖生物学进行了研究．洪湖日本沼虾的繁殖期为4月中旬至10月上旬，5月中旬至8月中旬为日本沼虾的繁殖高峰期，其中6月、8月雌虾抱卵率均在70％以上；日本沼虾群体中雄性总是少于雌性，月性比（♀／♂）变化于1．104－5．780之间，3—6月性比逐渐增高，7─10月性比则逐渐降低；在整个繁殖期．4─7月的抱卵虾均为前一年出生的大、中规格的个体，之后当年出生的个体在繁殖群体中逐渐占据优势；春季抱卵虾的绝对繁殖力和相对繁殖力都大于秋季抱卵虾，分别计算了绝对繁殖力、相对繁殖力与体长、体重的函数关系．本文还对日本沼虾群体性比的周年变化及其产卵次数进行了讨论．
The population reproduction of freshwater shrimp (Macrobrachium nipponensis ) was studied in Honghu Lake from May 1994 to June 1995.The spawning perlod of M. nipponensis is from mid-April to early October, and the peak lasts from mid-May to early September. the egg-carrying rates of females in June and August are both more than 70％. During the spawning period, the egg-carrying females from April to July are all bigger ones. born last year, afterwards the smaller Ones , born this year, predominate gradually among the egg-carrying ones.The number of the females is always more than that of the males. The monthly sex ratio (♀／♂ ) ranges from 1. 104 to 5. 780 , Increases from March to June but drops from July to October gradually,The absolute reproduction ability and relative reproduction ability of egg-carrying females in spring are both greater than those in autumn. The relationship between the absolute or relative reproduction ability and body length or weight can be expressed by different equations, for example, the relationship between the absolute reproduction ability and body length, the equations are F = 9. 7050L3.2032 (r =0. 9218 ) in spring and F =2. 6688L3. 9425 (r= 0. 9589 ) in autumn respectivelly.This report also deals with the reason for the monthly variations of the sex ratio and the spawning ability of M. ntheonensis in a year.
出处
《湖泊科学》
EI
CAS
CSCD
1998年第2期72-77,共6页
Journal of Lake Sciences
关键词
日本沼虾
种群
繁殖
洪湖
生物学
Macrobrachium nipponensis, population, reproduction. Honghu Lake
