Chitin also helps with defensive mechanism in plants to help fight diseases.
Chitin, a polymer of N-acetyl-D-glucosamine, is an important component of fungal pathogenicity, since fungal pathogens with defects in chitin synthesis are significantly less virulent on the original susceptible hosts.5,24 Although plants lack chitin, they do secrete chitin-degrading enzymes.18,22 During fungal infection, plant cells secrete chitinases that release chitin fragments (chitooligosaccharides or chitin oligomers) from fungal cell walls that can act as an elicitor to induce plant innate immunity against the invading pathogen.3,18,22,23,25 In agreement with this, overexpression of chitinase in plants led to enhanced resistance to fungal pathogens.4,11,18 Furthermore, pretreatment of plants with chitooligosaccharides enhances plant resistance against various pathogens.26,29 Additionally, recent gene expression profiling studies demonstrated that chitooligosaccharides were a potent regulator of plant gene expression.6,20,29,30 All this suggests that a chitin perception and signal transduction pathway is present in plants to mediate plant disease resistance.
Not sure what that's all about....off brand maybe?
With the behemoth crab industry in the PNW it's probably a local product.
A specific product from MarionAg (Salem, Oregon) offers a Crustacean Meal that includes Dungeness Crab and Shrimp shells from the Oregon Coast. It's not unusual to find inconsistencies in that product. It is available in late December through February depending on supply.