Old traditional method of fishing with otter

Recently I worked with a Famous Spanish photographer (Mr. Jon Hernandez) to make a documentary of very old fishing method (near about 600 years) in the world. Their fishing method is very unique though only 5 family is sustaining in our country. They located in the southern part of Bangladesh (Narail, khulna District). We were their for 2 days. We started work from 5 am to sun set. We explored the sundarban and Chitra river.