高产池塘白鲢鱼苗鱼种生长的研究

On the Growth of O^+ Sil Ver Carp in the Hich Yield Fish Culture Ponds

本文对高产养鱼池塘中白鲢鱼苗鱼种阶段的生长特性和规律进行了研究。经统计分析表明:1、白鲢鱼苗鱼种阶段的生长过程中,全长和时间的关系均呈直线相关(L=a+bt)。鱼种全长以7-8两月生长最快。日增长率、瞬时增长率以鱼苗阶段居高,鱼种阶段次之。2、白鲢鱼苗阶段体重和时间呈指数相关(W=ae^(bt)),体重生长之速度(dw/dt)和加速度(d^2w/dt^2)与时间成正比。3、鱼种阶段体重与时间呈“S”形曲线相关(W=K/1+ae^(-bt)),体重的生长则以7～9月间最快。生长曲线拐点在t=-1n(1/a)/b;W=k/2。体重生长之速度和加速度分别呈“正态”和“正弦”曲线形。日增重率、瞬时增重率和相对增重率亦以鱼苗阶段较大,鱼种阶段次之。

The present paper deals with the growth of O+ silver carp (Hypophth- almichthys molitrix) in the hgih yield fish culture ponds in shanghai. The first year carp rearing has been divided into two stages: the first stage- -from fry to summerling rearing and the second stage--from summerling to fingerling rearing. The relationships between total length(L) and time(t) can be expressed by linear regression (L=abt) for both stages. The rapid period of length growth of the second stage was from July to August. The values of increace rate of total length and instantaneous increase rate of total length in the first stage were higher than those of the the second stage. The relationship between body weight(w) and time(t) of the first stage can be fitted by an exponential curve (w=ae^(bt)). The weight growth rate (dw/dt) and growth acceleraration (d^2w/dt^2) are direct proportion to time. The relationship between body weight and time of the second stage can be described by a sigmoid curve (w=K/(1+ae^(-bt))). The faster period of weight growth of the secohd stage was from July to September, The inflection point of the curve was at t=-ln(1/a)/b; w=K/2. The curves of the weight growth rate and acceleration look like a' normal destribution curve' and a' sine curve' respectively. The values of increase rate, instantaneous increase rate and relative increase rate of body weight in the first stage were bigger than those of the second stage. The several parameters of diffefent models and some results have been calculated and shown on different Tables.