If the catfish has a strong fishy smell, it has gone bad. You can  also tell by looking at it, if you see areas that appear  discolored, it is likely bad.Finally, press on â¦ it, fresh fish  should bounce back and not feel squishy.1 person found this useful.f the catfish has a strong fishy smell, it has gone bad. You can  also tell by looking at it, if you see areas that appear  discolored, it is likely bad.
Frequency. The frequency of a wave is the number of waves produced by a source each second. It is also the number of waves that pass a certain point each second.The unit of frequency is the hertz (Hz). It is common for kilohertz (kHz), megahertz (MHz) and gigahertz (GHz) to be used when waves have very high frequencies.requency. The frequency of a wave is the number of waves produced by a source each second. It is also the number of waves that pass a certain point each second. The unit of frequency is the hertz (Hz).
The relative frequency is the frequency divided by the total number of outcomes. The relative frequency of the roll of four is 5/20 = 0.25. The cumulative relative frequency is the relative frequency of all data less than or equal to a particular value. Create a frequency table.