重庆江河水域网箱养殖鲢鱼调查分析

Investigations on the cage culture of silver carp in rivers in Chongqing

放养量０．３～１．０ｋｇ／ｍ~２，单产１．５～３．０ｋｇ／ｍ~２，年生产投入６．００～８．００元／ｍ~２，年利税 ２． １０～５．５０ 元／ｍ~２，产投比１．６１～１．７０；成鱼养殖（入箱鱼种＞５０ｇ／尾）可达 ５００ｇ／尾以上，放养量 １．５～３．０ｋｇ／ｍ~２，单产 ５．０～１３．０ｋｇ／ｍ~２，年生产投入１１．００～２６．００元／ｍ~２，年利税１６．００～６３．００元／ｍ~２，产投比 ２．５～４．３。放养规格（Ｘ_１，ｇ／尾）、放养量（Ｘ_２，ｋｇ／ｍ~２）、产出规格（Ｙ_１，ｋｇ／尾）、个体增重倍数（Ｙ_２）、产量（Ｙ_３， ｋｇ／ｍ~２）、年利税（Ｙ_４，元／ｍ~２）关系： Ｙ_１＝０．００６６Ｘ_１＋０．１６６６（Ｆ＝ ４１５． ９５＞Ｆ_０．０１＝ ７． １５），Ｙ_２＝ ８７．８３７Ｘ_１－０．６４２６（Ｆ＝ ４３２．９１＞Ｆ０．０１＝ ７． １５）， Ｙ_３＝ １／（０．０８９＋ ０．５２９ｅ^（－ｘ_２））（ｒ＝ ０．７８＞ ｒ_０．０１＝ ０．３４）；鱼种培育Ｙ_４＝－ ６． ３３Ｘ_１－３． ３９Ｘ_２＋ ６． ２９Ｙ_３－ ９． ６３（ Ｆ＝ ３５． ８４＞ Ｆ_０．０１＝ ４． ７６， ｔ_ｉ＞ｔ０．０５＝２． ０７）；成鱼养殖 Ｙ４＝４７．０１Ｘ_?

Stocked with silver care fries in net cages in rivers in Chongqing at rates of 0. 3-1. 0kg/m^2, the production of fingerlings in one growing season was 1. 5-3. 0 kg/m^2 and the mean harvest weight is alers 0. 15 kg/fingerling, with 6.00 - 8.00 Yuan/m^2annual expenditures, 2. 10-5 .50 Yuan/m^2 annual profit and tax and 1 .61-1 .70 of income/expenditure; while stocked with fingerlings (above 50g) at rates of 1. 5-3 .0 kg/m^2, the production in one growing season was 5. 0-13. 0 kg/m^2 and the mean harvest weight is above 0. 5kg/fish, with 11. 00-26. 00 Yuan/m^2 annual expenditures, 16.00-63 .00 Yuan/m^2 annual profit and tax and 2.50-4. 30 of income/expenditure; the equation of the stocking size (X_1, g/fish), stocking rate (X_2, kg/m_2 ), harvest size (Y_1, kg/fish), rate of weight increase of individual (Y_2), yield (Y_3, kg/m^2 ), profit and tax (Y_4, Yuan/m^2 ) is: Y_1 = 0.0067X_1 + 0. 1670 (F = 415.95 > F_(0.01) = 7. 15); Y_2 = 74.844X_1^(-0.432) (F = 432.91 > F_(0.01) = 7. 15); Y_3 = 1/ (0.089 + 0. 529e^(x_2) (r = 0 .780 > r0.01 = 0. 336 ), and the equation of fingerling culture is Y_4 = - 6 .33X_1 -3. 39X_2 + 6.29Y_3- 9.63 (F = 35.83 > F_(O.01) = 4.76, t_i > t_(0.05) = 2.07); the equation of adults culture is Y_4 = 47.01X_1- 4.54X_2 + 10.37Y_1 + 6. 10Y_3 - 15. 13 (F= 399 .82 >F_(0.01), = 4.76, t_i >t_(0.05) = 2 .07).