Mice, of course, have been introduced into New Zealand, along with the rats, stoats, and trout that now form parts of this beech forest food web. When well fed, mice are prolific breeders and can mature as young as two months of age, with litters being produced as frequently as ever), 20 to 30 days. How do mice find their way into rivers and the stomachs of trout?
I Don’t Want To Be Trout Food!!! – Mouse
FEATURED: ANIMAL CAPTIONS & CONFESSIONS
How many mice can a trout eat? Since more than 90% of all trout caught in South Island backcountry rivers are released, most anglers never examine the stomach contents of large trout that have been feeding on mice. The brown that first triggered our interest was only kept because it was bleeding heavily from the gills and had a limited chance of survival This 3.4kg (7.51b) turned out to have 13 mice in its stomach. Of these, eight were intact and fresh and had probably been consumed during the previous night. The other five were partially digested, suggesting they had had been consumed two nights earlier. The total weight of mice in the stomach was estimated at about 0.25kg (0.51b) and raises the question as to why the fish thought it had to eat a size 10 nymph as well. Perhaps just to keep itself familiar with other food for when the mice supply ceased? Although we were impressed with the appetite of our fish, the unofficial record may go to a Nelson Lakes trout that we were reputably told had eaten 23 mice. Anglers undoubtedly have other experiences of mice-eating trout. And does eating mice make the flesh pale or give it an unpleasant taste? Well, our sample size of one suggests not, as it was a pleasant light orange colour and the taste attracted only compliments front the group of friends who enjoyed eating it with us, although they were not informed of its history! We never cease to learn… I had no idea trout ate mice… We came across this little chap on one of our walks near Queenstown. Another introduced animal that has become a pest… but they truly are so cute .. Panasonic Lumix DMC-FZ35 Southland New Zealand March 2012
Information from an article I found very intresting