微胶囊饲料一些理化指标的测定与评价

Determination and Evaluation of Some Physical and Chemical Indices of Microcapsule Feed

[目的]研究微胶囊饲料的理化性质。[方法]以大黄鱼仔稚鱼微胶囊饲料为研究对象,测定了微胶囊饲料的一些理化指标。[结果]1号饲料的平均粒径为(27.77±1.18)μm,颗粒呈圆形或椭圆形,分布均匀;2号饲料的平均粒径为(34.73±1.76)μm,颗粒呈不规则形,大小分布不均匀。微胶囊饲料粒径在20~40μm;微胶囊饲料的悬浮率和溶解率均偏低。在海水中浸泡2 h后,微胶囊饲料1号浸泡液的pH为(6.800±0.056),氨氮浓度为(0.052±0.003)mg/L,亚硝酸盐浓度为(0.412±0.006)mg/L;微胶囊饲料2号浸泡液的pH为(6.683±0.031),氨氮浓度为(0.047±0.005)mg/L,亚硝酸盐浓度为(0.493±0.026)mg/L。微胶囊饲料对水体有一定的影响,浸泡液偏酸性,但对水体中氨氮和亚硝酸盐浓度的影响不大。[结论]试验所用微胶囊饲料基本满足大黄鱼苗开口时期的摄食要求,但其加工工艺有待进一步完善。

[Objective]To study the physical and chemical properties of microcapsule feed.[Method]Taking microcapsule feed of Pseudosciaena crocea larvae as research object,some physical and chemical indices of microcapsule feed were determined.[Result]The average particle size of feed No.1was(27.77±1.18)μm,with circular or oval particles and even size.The average particle size of feed No.2was(34.73±1.76)μm,with irregular-shaped particles and uneven size.The average particle size of microcapsule feed was within20-40μm.The suspension rate and solubility of microcapsule feed were lower.After microcapsule feed was soaked in seawater for2h,soaking solution’s pH of microcapsule feed No.1was(6.800±0.056),ammonia nitrogen concentration was(0.052±0.003)mg/L,nitrite concentration was(0.412±0.006)mg/L;soaking solution’s pH of microcapsule feed No.2was(6.683±0.031),ammonia nitrogen concentration was(0.047±0.005)mg/L,nitrite concentration was(0.493±0.026)mg/L.Microcapsule feed had some influences on the water body,the soaking solution was acidic,but it had small influences on the concentrations of ammonia nitrogen and nitrite in water body.[Conclusion]Microcapsule feed used in this test could basically meet the feeding requirements of P.crocea seedlings in opening period,but the processing technology need to be improved.