Esme Stallard Climate and science reporter
Getty Images Fish species that undertake mammoth migrations through rivers, lakes and ponds are facing a combined threat from dams, pollution and overfishing preventing them from reaching their breeding grounds.
The golden mahseer and goonch catfish are some of the thirty flagship fish species which have now been prioritised for global conservation by the UN in a new report.
A team of international scientists assessed more than 1








