Abstract
In this chapter, the potentially harmful compounds, which may be found in ingredients used in fish feed, are gathered in two groups, the antinutritional factors (ANFs) and the adventitious toxins (ATs). The ANFs are naturally occurring constituents of feed ingredients, whereas the ATs come from other sources than the plant. The function of an ANF in a plant is, in most cases, to protect the plant against bacteria, fungi, insects, and larger animals. However, some antinutrients are clearly important for internal functions of the organism. Many plants with seemingly high nutrient content are not considered as food or feed due to their high content of antinutrients, which are difficult to inactivate or remove. In castor beans (Ricinus communis) containing the lectin ricin and rosary peas (Abrus precatorius) containing the lectin abrin, the toxic potency of the ANFs in the seeds is so high that they are useless as food.
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