Whistle-blowers offering tips concerning fake or substandard shark fins in Guangdong province will be rewarded 300 yuan ($48) to 300,000 yuan.

The reward is part of a month-long campaign launched by Guangdong government against the production, sale and use of fake and substandard shark fins, according to the provincial food safety commission's statement released on Tuesday.

Earlier media reports said that most shark fins sold in Zhejiang province are fake, and the fake shark fin samples that Zhejiang food inspectors have found were reportedly from Guangdong province.

The inspectors also found that some shark fins sold in the market are processed with poisonous chemicals.

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