For each scheduled employment variable Dearness Allowance has been fixed by the government. The VDA will be a certain amount which is calculated on every increase in the consumer price index over and above a fixed base index. It may be Rs 24 for every increase in the CPI above 130 points, or like. If the CPI is 167 (new series) for your district, then the VDA will be 24 X 37 (ie, the point of increase in CPI over 130 base index), Rs 888 per month. Different VDA is also fixed for daily rated workers. There are two indices, new series and old series. Some firms take the DA on old series whereas some other firms take DA on new series of CPI. Find out the practice being followed in sea food exporting industry and follow the practice. For DA please refer to the Minimum Wages notification in respect of your industry and for CPI contact the Bureau of Economics and Statistics. The Chamber of Commerce use to publish CPI of all the districts in Kerala on a monthly basis. You can contact them also.
Regards,
Madhu.T.K