Input credit on service tax

Out company is engaged in the business of shrimp export busines. We are using various services and paying service tax.  Can we take input credit all servuces utilised for exporting shrimp or services utilised  upto make the shrimp eligible for export before removing from the factory.  After removing from factory we will take various services. Ex. CFA service,  can we take service tax input on services received form factory.

Give me the clarification