Without considering the smell of fish, the L-Amino acids present in Explorer are neither as available nor in as high of quantity inside of fish fertilizers.
Most fish products contain variables of proteins in an animal form, that still must be broken down by soil microbes. In cold regions, this absorption of nitrification is slowed, and nutrient uptake can be limited.
Fish fertilizers are inherently insoluble, leading to clogged lines and potential safety concerns regarding E-Coli and other contaminants while Explorer™ is exempt from that FSMA ruling and could be applied days prior to harvest.