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).
(It is rounded off to a more convenient round off value). Cumulative frequency table for grouped data. For grouped data, the cumulative frequency is the total frequency of all data points less than or equal to the upper class boundary of the class interval under consideration.