Trout

AVIEMORE, SCOTLAND - JUNE 07:  An Osprey catches two Rainbow Trout at Rothiemurchus on June 6, 2016 in Kincraig, Scotland. Ospreys migrate each spring from Africa and nest in tall pine trees around the Aviemore area, the raptor was hunted to the point of extinction in the Victorian era, their migratory habits eventually brought them back to Scotland with the first successful breeding pair being recorded in 1954.  (Photo by Jeff J Mitchell/Getty Images)

Jeff J Mitchell/Getty

An Osprey catches two Rainbow Trout at Rothiemurchus in Kincraig, Scotland. Ospreys migrate each spring from Africa and nest in tall pine trees around the Aviemore area 

TOPSHOTS Visitors look at the fish throu...TOPSHOTS Visitors look at the fish through the transparent walls of a tunnel in a lake in Madra, 70 km southeast from Brno, South Moravia, Czech Republic on September 30, 2013. The tunnel, which is located at a depth of three meters, measuring eight meters in length from which one can observe sturgeon, carp, catfish, perch, tench, eell and trout. AFP PHOTO/ RADEK MICARADEK MICA/AFP/Getty Images

Radek Micaradek/AFP/Getty

A three-metre deep underwater tunnel allows visitors to watch fish in a lake at Madra, Czech Republic. Sturgeon, carp, catfish, perch, tench, eel and trout can be viewed from the eight-metre transparent tube, located 70km southeast of Brno, South Moravia.