Dear Sanjeev, for pursuing BFSc in Tamilnadu, you can to apply through :

1. TNFU BFSc. Only candidates belonging to Tamilnadu with relevant qualification can apply for this course. 

2. Annamalai University: A pass in the Higher Secondary Course (10+2) / CBSE / any other examination recognized as equivalent thereto and fulfilling the following requirements are required.Biology or Zoology and Botany  OC: 60%, BC/BCM: 60%, MBC/DNC: 55%, SC/SCA/ST: Pass. Chemistry and Physics taken together OC: 60%, BC/BCM: 60%, MBC/DNC: 55%, SC/SCA/ST: Pass. Aggregate of (1) and (2) above to be not less than OC: 70%, BC/BCM: 65%, MBC/DNC: 60%, SC/SCA/ST: Pass.

Annamalai University doesn't have any different aggregate for other state candidates.

3. Fisheries College and Research Institute: Pass marks in 10+2 is the eligibility criteria for every candidate.