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随着池塘混养鱼类品种的增加以及放养密度的提高,池塘内不同鱼类的不同鱼病同时发生的现象大大增加。通常情况下,用药单一往往效果不佳,为此,很多渔场采用鱼药混用的方法,成效显著。混用原则①不应影响药物有效成分的化学稳定性。②不应使毒性增大,理想的效果是增效不增毒。③?
With the increase of pond polyculture fish species and the increase of stocking densities, the simultaneous occurrence of different fish diseases of different fish species in the pond greatly increased. Under normal circumstances, often a single drug is ineffective, therefore, many fisheries using a combination of fish and other methods, the effect is remarkable. Mix principle ① should not affect the chemical stability of the active ingredients of the drug. ② should not increase the toxicity, the ideal effect is to increase efficiency without increasing toxicity. ③?