Download WOR 2 PDF - World Ocean Review

Plenty more fish in the sea? Resolute fisheriesmanagementcan ensure the recoveryof a fish stock.After the North Seaherring was overfishedin the 1960s(as revealed by thedrop in spawning biomass),the fishery wascompletely closed.The stock, particularlythe numbers ofsexually mature fish(spawners), regenerated.After renewedover-fishing in the1990s a managementplan was agreed in1997, which onceagain limited catches.The spawning stockwas able to recover.The reduction ofspawning biomasssince 2002 can presumablybe ascribedto climatic changes.Purse seineA purse seine is a netthat is used to encirclea school of fish. Thenet is then drawntogether to retain thefish by using a line atthe bottom, allowingthe net to be closedlike a purse.