Jellyfish blooms can potentially have detrimental impacts on fisheries by impairing the recruitment of larval fish and outcompeting economically significant fish species. In overexploited fisheries, this can prevent recovery of target fish species and result in the creation of an alternative stable state. Blooms generally coincide with a decrease in fish catch, which results in decreased profits and fewer jobs. Large blooms can also compromise fishing nets and overwhelm gear. These problems along with additional fuel consumption and lost man hours have caused major economic losses for fishing fleets (e.g. roughly €8 million per year for Italian Adriatic fleet). In contrast, some blooms could potentially benefit commercial fisheries. One example is found in the Chesapeake Bay estuary, where evidence suggests the presence of sea nettles ("Chrysaora quinquecirpha") has a positive effect on oyster populations. When abundant, the sea nettles are major predators of Ctenophores, ravenous predators that can compete with oysters. Commercial harvesting of jellyfish has grown in southeast Asia, primarily driven by the increased demand for jellyfish in some Asian cuisines. Jellyfish fisheries could be a strategy for controlling blooms, yet these fisheries still remain small scale and have not yet expanded to markets outside of Asia. Negative effects of jellyfish blooms are also felt in the aquaculture industry. Jellyfish occasionally find their way into sea pens in industrial fish farms and have been recorded to injure and kill fish. In 2011, a fish farm in Spain reported 50,000 € in profits lost due to fish mortality following an influx of jellyfish into their pens. Even short term exposure to jellyfish can be extremely harmful within fish farm enclosures. In the case of farmed salmon, exposure to jellyfish was correlated with potentially fatal gill damage. Power plants are often built on coasts and draw seawater for industrial cooling water. Jellyfish can clog the water intakes of power plants, which can decrease energy production or cause shutdowns. While total shutdown due to jellyfish clogging is uncommon, revenue losses can be significant. In some estimates, revenue losses are up to 5.5 million Indian rupees (US$) per day during a shutdown. Not all clogs lead to shutdowns, though even minor intake perturbations can result in lost revenue. Some measures are available to prevent jellyfish-related interruptions. Power plants in Japan use bubble-curtain devices which produce air bubbles near intake valves which lift the jellyfish, reducing the number that are sucked into the pumps.