alt Hacker Newsdepends on how big the net is. some of those huge trawllers do lots and lots of damage.
tempeh can be crazy toxic if spoilt. there is coconut tempeh which is officially banned due to potential for toxic contamination, but which is still super popular -- and routinely kills a couple of people every year.
I'm curious. Do you mean spoiled during the production process (ie was inedible to begin with) or spoiled in storage (ie was edible at time of purchase)?