36 problems carry the sea and its farms

Ocean problems in the collection cluster around aquaculture and monitoring: a virus that destroyed 60 percent of Brazil's shrimp production in six months with no field-deployable test to catch it, the standard response to shrimp disease — total pond disinfection — actually making outbreaks worse by destroying the pond's microbial community, and low-cost water-quality sensors whose studies mostly skip validation against a trusted reference.