seal bomb

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Noun1.seal bomb - a small explosive device (resembling a firecracker) that is used underwater in order to frighten mammals away from fishing grounds
explosive device - device that bursts with sudden violence from internal energy
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and determined that the object was a "Seal Bomb" an explosive device often used to minimize birds and pests on farms and repel seals from airports, landfills, farmlands, golf courses and fishing areas.
The explosive device was said to be a "seal bomb", which fishermen use to scare seals away from fishing grounds.
CLACKAMAS - A boat crew armed with seal bombs and shotguns loaded with firecrackers will be back on the Willamette River this year trying to keep sea lions from chowing down on salmon bottled up at Willamette Falls.