Answer for Do we have any publication that actually provides a photographic guide to all of our freshwater fish species?

You may read the book-

• http://document.bdfish.org/2016/09/red-list-of-bangladesh-volume-5-freshwater-fishes/
• http://document.bdfish.org/2014/02/introduction-to-fish-species-diversity-sunamganj-haor-region-within-cbrmps-working-area/
• http://document.bdfish.org/2013/02/hand-book-exotic-ornamental-fishes-bangladesh-identifying-tool/