June 3, 2018 — When fish are in short supply, every fish counts. To make every fish count, it’s important to accurately and comprehensively count the fish.
Three miles offshore, in the Gulf of Alaska’s industrial groundfish fisheries, counting fish is the job of fishery observers. These trained scientists gather data about what the vessels catch and keep, and what they discard as bycatch. The data collected is essential for monitoring and managing the fisheries.
Trawler boats that fish for pollock, cod, rockfish and flatfish are required to carry independent fishery observers for some of their trips. This is a requirement that makes sense; it is well-known to fishery managers that trawlers can easily end up taking more than their fair share of fish from the ocean. Large trawl nets, dragged through the water or along the seafloor, catch thousands to tens of thousands of fish in a single pass. Not all that fish is kept. Some species, such as salmon, halibut and crab, are required by law to be discarded. Those species are valuable as their own fisheries, so long-standing management measures have been put in place to prevent trawlers from targeting and selling them. Other species that are undesired or can’t be sold, like skates, sharks, snailfish and sculpins, are thrown back, dead or dying. The same goes for the corals, sponges and sea stars that make up the living structure of the Alaskan seafloor.