Abstract
수산가공공장폐액의 주성분은 수용성단백질이며 일부 지방이 함유되어 있는 특성이 있으므로 그 수용성 단백질을 등전점 침전처리에 의해 침전회수하여 어분 대체 사료로서의 이용을 시도하였다. 1차 이스라엘잉어 사육 실험에서는 지방 산화가 진행된 고등어가공공장폐액으로 제조 된 고등어가공공장폐액 회수단백질 어분의 첨가량이 증가할수록 사료효율이 떨어지는 결과를 보였으나, 이 산화된 고등어가공폐액 회수단백질의 산화된 지방성분을 제거한 후 다시 2차 이스라엘 잉어 사육 실험을 한 결과에서는 고등어가공폐액 회수단백질의 첨가량이 증가할수록 사료효율이 좋음을 확인하였다. 따라서, 지금까지 버려지는 고등어가공공장폐액 중 수용성단백질을 등전점이동 응집처리법으로 회수하여 어분 대체 단백질원으로 활용할 수 있음을 실제 field에서의 이스라엘 잉어 사육 실험으로 확인할 수 있었다. Mackerel water-soluble protein fraction produced by washing the mackerel meat were concentrated by isoelectric point shifting precipitation process, and the concentrates were utilized as the alternative feed of fish meal. In the 1st aquaculture diet experiment for Israel common carp, the feed conversion ratio decreased in proportion to the rise in the percentage of the recovered protein containing a residual lipid, which was added to the fish meal. It was supposed that the low feed efficiency was because of lipid oxidation in the recovered protein fraction. In addition, 2nd aquaculture diet experiment for Israel common carp was conducted after removing the oxidized lipid in the recovered protein fish meal. When a portion of the fish meal was substituted by the recovered protein devoid of the residual lipid, the feed conversion ratio increased in proportion to the amount of the substitute being added to the fish meal. Therefore, the recovered protein fraction of the mackerel washing wastewater from mackerel processing factory could be used as the alternative feed of fish meal.
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