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
References in periodicals archive ?
A seal bomb is a noisemaker similar to an M-80 firecracker that is used to scare seals away from fishing grounds without harming them.
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.
The bomb squad discovered four seal bombs and two blasting caps.