Certification & Core Plus Development Guides. The Guides were initially implemented on October 1, 2007. While changes to the certification standards are normally implemented on October 1, of any given year, other aspects of the guide, in particular the Core Plus component may be modified throughout the year.
Time. Fresh fish will only last in the refrigerator for one or two days, and shellfish will last up to three days. For longer periods of storage, you must freeze the fish or it will spoil. However, do not refreeze the fish once you have thawed it.
Flesh should be firm when touched. You can store catfish in the refrigerator for up to 2 days and then freeze. Never let it defrost at room temperature. Instead, place in the refrigerator overnight or place under cool, running water. Freezing in water causes the fish to absorb the water.